RTLPlayground/rtlplayground.c

#include <8051.h>
#include <stdint.h>

// #define REGDBG 1
// #define RXTXDBG 1

#include "rtl837x_sfr.h"
#include "rtl837x_regs.h"
#include "rtl837x_common.h"
#include "rtl837x_flash.h"
#include "rtl837x_pins.h"
#include "rtl837x_phy.h"
#include "rtl837x_port.h"
#include "rtl837x_trap.h"
#include "rtl837x_stp.h"
#include "rtl837x_lacp.h"
#include "rtl837x_igmp.h"
#include "rtl837x_leds.h"
#include "rtl837x_bandwidth.h"
#include "rtl837x_init.h"
#include "rtl837x_lldp.h"
#include "dhcp.h"
#include "cmd_parser.h"
#include "cmd_editor.h"
#include "uip/uipopt.h"
#include "uip/uip.h"
#include "uip/uip_arp.h"
#include "machine.h"
#include "phy.h"
#include "syslog.h"
#include "dns.h"
#include "ntp.h"
#include "httpd/page_impl.h"
#include "boot.h"
#include "sfp.h"

extern __code const struct machine machine;
extern __xdata uint32_t flash_size;

extern __xdata uint16_t crc_value;
__xdata struct machine_runtime machine_detected;
void crc16_bank1(__xdata uint8_t *v) __naked;

// See setup_serial_timer1() for valid baudrate settings!
#define SERIAL_BAUD_RATE 115200

/* All RTL839x switches have an external 25MHz Oscillator,
   VALID RTL8372/3 CPU frequencies found in switches are:
   0x07735940 = 125,000,000
   0x03b9aca0 =  62,500,000
   0x01dcd650 =  31,250,000
   0x013d6200 =  20,800,000
   For the following frequencies, divider settings are known
   and can be selected on all known HW (Register 0x6040)
*/
#define CLOCK_HZ 125000000
//#define CLOCK_HZ 20800000

// Derive the divider settings for the internal clock
#if CLOCK_HZ == 20800000
#define CLOCK_DIV 3
#elif CLOCK_HZ == 31250000
#define CLOCK_DIV 2
#elif CLOCK_HZ == 62500000
#define CLOCK_DIV 1
#elif CLOCK_HZ == 125000000
#define CLOCK_DIV 0
#endif

/* Derive divider for the system ticks
   TIMER2 can divide the F_CPU by 4 or 12.
   So the F_TICKS are in the range of:
   -  F_TIMER_DIV4_OVERFLOW = F_SYS /  DIV4 / 1..65536 = 125MHz /  4 / 1..65536 = 31.25 MHz .. 476.8 Hz
   - T_TIMER_DIV12_OVERFLOW = F_SYS / DIV12 / 1..65536 = 125MHz / 12 / 1..65536 = 10.42 MHz .. 158.9 Hz
   Selecting dividor 12 settings to get lowest timer tick posiable which is already high.
*/
#define SYS_TICK_HZ 200

#define TIMER2_DIV (CLOCK_HZ / 12 / SYS_TICK_HZ)
#if TIMER2_DIV > 0xFFFF
#error "SYS_TICK_HZ to low, must be >= 159"
#endif
#define SYSTICK_TIMER2_VALUE (0x10000 - TIMER2_DIV)

__xdata uint8_t idle_ready;

__code const uint8_t ownIP[] = { 192, 168, 2, 2 };
__code const uint8_t gatewayIP[] = { 192, 168, 2, 22};
__code const uint8_t netmask[] = { 255, 255, 255, 0};

__xdata struct uip_eth_addr uip_ethaddr;

volatile __xdata uint32_t ticks;
volatile __xdata uint8_t sec_counter;
volatile __xdata uint16_t sleep_ticks;
__xdata uint8_t stp_tick_last;
__xdata uint8_t arp_age_secs;
extern __xdata struct dhcp_state dhcp_state;

#define STP_TICK_STEP (SYS_TICK_HZ / STP_HZ)
#define STP_CATCH_UP 8
#define SFP_TICK_STEP 10
__xdata uint8_t sfp_tick_last;

/* Buffer for serial input, SBUF_SIZE must be power of 2 < 256
 * Writing to this buffer is under the sole control of the serial ISR
 * Note that key-presses such as <cursor-left> can create multiple
 * keys being sent via the serial line */
__xdata volatile uint8_t sbuf_ptr;
__xdata uint8_t sbuf[SBUF_SIZE];

// Registry data in sfr is in *big endian* order, so sfr_data[0] is the MSB and sfr_data[3] the LSB
__xdata uint8_t sfr_data[4];

extern __xdata uint8_t gpio_last_value[8];

extern __xdata struct flash_region_t flash_region;

__code const uint8_t * __code const greeting = "\nA minimal prompt to explore the RTL8372:\n";
__code const uint8_t * __code const hex = "0123456789abcdef";

__xdata uint8_t flash_buf[FLASH_BUF_SIZE];

// NIC buffers for packet RX/TX
__xdata uint8_t rx_headers[16]; // Packet header(s) on RX
__xdata uint8_t uip_buf[UIP_CONF_BUFFER_SIZE+2];

__xdata uint16_t rx_packet_vlan;
__xdata uint16_t management_vlan;
__xdata bool frame_tagged;
__xdata uint8_t tx_seq;

__xdata bool stp_enabled;
__xdata uint8_t igmpEnabled;
__xdata bool lldp_enabled;
__xdata char hostname[24];	/* device hostname, default set at boot, see rtl837x_common.h */
__xdata uint8_t lacpEnabled;

__code const uint16_t bit_mask[16] = {
	0x0001, 0x0002, 0x0004, 0x0008, 0x0010, 0x0020, 0x0040, 0x0080,
	0x0100, 0x0200, 0x0400, 0x0800, 0x1000, 0x2000, 0x4000, 0x8000
};


__xdata uint8_t linkbits_last[4];
__xdata uint8_t linkbits_last_p89;
__data __at(0x20) volatile uint8_t evflags;
volatile __bit __at(0x00) link_irq;
volatile __bit __at(0x01) rx_irq;
volatile __bit __at(0x02) tick_pending;
__bit __at(0x03) cmd_available;
// Last known state of the SFP detection/Loss of Signal pins
__xdata bool button_last;
__xdata uint8_t button_sec_counter_last;
volatile __bit tx_buf_empty;


struct eth_in {
	struct uip_eth_addr dst;
	struct uip_eth_addr src;
	struct rtl_tag rtl_tag;
	struct vlan_tag vlan_tag;
	u16_t ether_type;
};

// Dot 1Q tag size is the size of tpid + tci
#define DOT_1Q_TAG_SIZE 4

struct q_frame {
	uint8_t tx_seq;
	uint8_t chksum_flags;	// 0x7 enables Checksums for frame header, L2 and L3
	uint8_t reserved_1 [2];
	uint16_t len; // Length is Little Endian
	uint8_t reserved_2 [2];
	struct uip_eth_addr dst;
	struct uip_eth_addr src;
	uint16_t tpid;
	uint16_t tci;
};

struct nonq_frame {
	uint8_t padding[DOT_1Q_TAG_SIZE];
	uint8_t tx_seq;
	uint8_t chksum_flags;	// 0x7 enables Checksums for frame header, L2 and L3
	uint8_t reserved_1 [2];
	uint16_t len; // Length is Little Endian
	uint8_t reserved_2 [2];
	struct uip_eth_addr dst;
	struct uip_eth_addr src;
};

#define ETH_IN ((__xdata struct eth_in *)&uip_buf[0])
#define ETHERTYPE_OFFSET (12 + VLAN_TAG_SIZE + RTL_TAG_SIZE)

// The output frame structure with initial frame descriptor including padding
#define FRAME ((__xdata struct nonq_frame *)&uip_buf[0])

// The output frame structure with 802.1Q field and the padding moved before the buffer-start
#define FRAME_Q ((__xdata struct q_frame *)&uip_buf[0])

// Ether-type of the output frame, which is the RTL tag on a CPU-tagged frame
#define FRAME_ETHERTYPE (*(__xdata uint16_t *)&uip_buf[RTL_FRAME_DESC_SIZE + 2 * sizeof(struct uip_eth_addr)])

void isr_timer0(void) __interrupt(1)
{
}


// Timer2: Handle SYS_TICK
void isr_timer2(void) __interrupt(5)
{
	ticks++;
	tick_pending = 1;
	if (sleep_ticks > 0)
		sleep_ticks--;
	sec_counter++;

	// Clear TF2 & EXF2 by software
	T2CON &= ~0xC0;
}


void isr_serial(void) __interrupt(4)
{
	if (RI == 1) {
		RI = 0;
		sbuf[sbuf_ptr] = SBUF;
		sbuf_ptr = (sbuf_ptr + 1) & (SBUF_SIZE - 1);
	}
	if (TI == 1) {
		TI = 0;
		tx_buf_empty = 1;
	}
}


/* Set by the httpd while it runs a command that arrived over the network, so
 * that everything the command prints lands in the response as well. */
__xdata uint8_t cmd_capture;
extern __xdata uint8_t outbuf[TCP_OUTBUF_SIZE];
extern __xdata uint16_t slen;

void write_char_no_syslog(char c)
{
	/* Capturing sits here rather than in write_char() so that the messages
	 * printed through print_string_no_syslog() are captured too: those are
	 * the replies of the syslog commands, which must not generate a syslog
	 * packet but do belong in the answer to a command sent over HTTP. */
	if (cmd_capture) {
		if (slen < TCP_OUTBUF_SIZE - sizeof(CMD_TRUNCATED))
			outbuf[slen++] = c;
		else
			cmd_capture = 2;	/* out of room, httpd says so */
	}

	do {
	} while (tx_buf_empty == 0);
	if (c =='\n') {
		tx_buf_empty = 0;
		SBUF = '\r';
		do {
		} while (tx_buf_empty == 0);
	}
	tx_buf_empty = 0;
	SBUF = c;
}

void write_char(char c)
{
	write_char_no_syslog(c);

	if (syslog_state.enabled) {
		__xdata uint16_t next = (syslog_state.writeptr + 1) & (LOGBUF_SIZE - 1);

		/* The ring is drained once per main loop pass, and a single command
		 * can print several times its size, so writing on regardless laps
		 * the reader and the datagram starts mid record. Drop instead, and
		 * flag a line so the reader empties what is there even if no
		 * newline has been seen yet. */
		if (next == syslog_state.readptr) {
			syslog_state.line_available = 1;
			return;
		}
		logbuf[syslog_state.writeptr] = c;
		syslog_state.writeptr = next;
		if (c == '\n')
			syslog_state.line_available = 1;
	}
}

void itoa(uint8_t v)
{
	uint8_t t = (v / 100);
	// when print_zeros is not zero, we know that a non-zero number has printed.
	// That have to print all the next numbers.
	uint8_t print_zeros = t;
	if (print_zeros)
		write_char('0' + t);
	t = (v / 10) % 10;
	print_zeros |= t;
	if (print_zeros)
		write_char('0' + t);
	write_char('0' + (v % 10));
}


/* Same as itoa(), one decade wider: enough for a port number. Kept separate
 * rather than widening itoa() itself, because every existing caller passes a
 * byte and would start paying for 16-bit divisions it does not need. */
void itoa_short(uint16_t v)
{
	uint8_t t = v / 10000;
	uint8_t print_zeros = t;

	if (print_zeros)
		write_char('0' + t);
	t = (v / 1000) % 10;
	print_zeros |= t;
	if (print_zeros)
		write_char('0' + t);
	t = (v / 100) % 10;
	print_zeros |= t;
	if (print_zeros)
		write_char('0' + t);
	t = (v / 10) % 10;
	print_zeros |= t;
	if (print_zeros)
		write_char('0' + t);
	write_char('0' + (v % 10));
}


void print_string(__code const char *p)
{
	while (*p)
		write_char(*p++);
}

void print_string_no_syslog(__code const char *p)
{
	while (*p)
		write_char_no_syslog(*p++);
}

void print_string_newline_no_syslog(__code const char *p)
{
	write_char_no_syslog('\n');
	print_string_no_syslog(p);
}

void print_string_x(__xdata char *p)
{
	while (*p)
		write_char(*p++);
}


void memcpy(__xdata void * __xdata dst, __xdata const void * __xdata src, uint16_t len)
{
	__xdata uint8_t *d = dst;
	__xdata const uint8_t *s = src;
	while (len--)
		*d++ = *s++;
}

int memcmp(__xdata const void *a, __xdata const void *b, uint16_t len)
{
	__xdata const uint8_t *x = a;
	__xdata const uint8_t *y = b;
	while (len--) {
		if (*x != *y)
			return *x - *y;
		x++;
		y++;
	}
	return 0;
}

void memcpyc(__xdata uint8_t *dst, __code const uint8_t *src, uint16_t len)
{
	while (len--)
		*dst++ = *src++;
}


void memset(__xdata uint8_t *dst, __xdata uint8_t v, uint8_t len)
{
	while (len--)
		*dst++ = v;
}

uint16_t strtox(__xdata uint8_t *dst, __code const char *s)
{
	__xdata uint8_t *b = dst;
	while (*s)
		*dst++ = *s++;
	*dst = 0;
	return dst - b;
}


uint16_t strlen(__code const char *s)
{
	uint16_t l = 0;
	while (s[l])
		l++;
	return l;
}


uint16_t strlen_x(__xdata const char *s)
{
	uint16_t l = 0;
	while (s[l])
		l++;
	return l;
}


uint16_t strcpy(__xdata uint8_t *dst, const char *s)
{
	__xdata uint8_t *b = dst;
	while (*s)
		*dst++ = *s++;
	*dst = 0;
	return dst - b;
}


char strcmp(__xdata const uint8_t *a, __code const uint8_t *b)
{
	uint8_t i = 0;

	while (b[i] && (b[i] == a[i]))
		i++;

	if (a[i] < b[i])
		return -1;
	else if (a[i] > b[i])
		return 1;
	return 0;
}


/*
 * True when b is a prefix of a. Unlike strcmp() the byte after the match is not
 * compared, and unlike is_word_x() it need not be a separator.
 */
bool strstart(__xdata const uint8_t *a, __code const uint8_t *b)
{
	uint8_t i = 0;

	while (b[i] && (b[i] == a[i]))
		i++;

	return !b[i];
}


bool strstart_x(__xdata const uint8_t *a, __xdata const uint8_t *b)
{
	uint8_t i = 0;

	while (b[i] && (b[i] == a[i]))
		i++;

	return !b[i];
}


void print_short(uint16_t a)
{
	// allocating the registers first improves the sdcc code here
	uint8_t h = a >> 8;
	uint8_t l = a;

	print_string("0x");
	print_byte(h);
	print_byte(l);
}

void print_long(uint32_t a)
{
	// allocating the registers first improves the sdcc code here
	uint8_t a24 = a >> 24;
	uint8_t a16 = a >> 16;
	uint8_t a8 = a >> 8;
	uint8_t a0 = a;

	print_string("0x");
	print_byte(a24);
	print_byte(a16);
	print_byte(a8);
	print_byte(a0);
}

void print_byte(uint8_t a)
{
	char high = (a >> 4) + '0';
	if (high > '9') {
		high += 'a' - ('0' + 10);
	}
	write_char(high);

	char low = (a & 0xf) + '0';
	if (low > '9') {
		low += 'a' - ('0' + 10);
	}
	write_char(low);
}

void print_cmd_prompt(void)
{
	print_string_no_syslog("\n> ");
}

/*
 * External IRQ 0 Service Routine: the switch reports a link change. The
 * register access macros share the SFR data bytes with the main loop, so
 * the handler only latches the event; idle() reads and clears it.
 */
void isr_ext0(void) __interrupt(0)
{
	EX0 = 0;
	link_irq = 1;
}


/*
 * External IRQ 1 Service Routine, triggered by the NIC recieving a packet
 */
void isr_ext1(void) __interrupt(2)
{
	EX1 = 0;
	rx_irq = 1;
}

/*
 * External IRQ 2 Service Routine
 * Note that all registers are being put on the STACK because of calling a subroutine
 */
void isr_ext2(void) __interrupt(8)
{
	EXIF &= 0xef;	// Clear IRQ flag (bit 4) in EXIF
}

/*
 * External IRQ 3 Service Routine
 * Note that all registers are being put on the STACK because of calling a subroutine
 */
void isr_ext3(void) __interrupt(9)
{
	EXIF &= 0xdf;	// Clear IRQ flag (bit 5) in EXIF
}

// Timer2: handles system tick.
void setup_timer2(void)
{
	T2CON = 0x00; // Timer2: Mode 16-bit timer with auto-reload, disable the timer.

	// Timer 2 clock select F_SYS / 12;
	// T2M = 0 uses clk/12;
	CKCON &= ~0x20;

	// The RCAP2 registers contain the high/low byte that is loaded into
	// timer2 when T2 overflows to 0x10000
	RCAP2_U16 = SYSTICK_TIMER2_VALUE;

	T2CON |= 0x04; // Timer2: Enable

	// IP |= 0x20; // TEST: Make Timer 2 interrupt as high priority.
	ET2 = 1; // Enable Timer2 interrupt.


}


void reg_read(uint16_t reg_addr)
{
	SFR_REG_ADDR_U16 = reg_addr;
	SFR_EXEC_GO = SFR_EXEC_READ_REG;
	do {
	} while (SFR_EXEC_STATUS != 0);
	/* The result is now in SFR A4, A5, A6, A7 */
}


void reg_read_m(uint16_t reg_addr)
{
#ifdef REGDBG
	if (EA) { write_char('r'); print_byte(reg_addr >> 8); print_byte(reg_addr); write_char(':'); }
#endif
	SFR_REG_ADDR_U16 = reg_addr;
	SFR_EXEC_GO = SFR_EXEC_READ_REG;
	do {
	} while (SFR_EXEC_STATUS != 0);
	sfr_data[0] = SFR_DATA_24;
	sfr_data[1] = SFR_DATA_16;
	sfr_data[2] = SFR_DATA_8;
	sfr_data[3] = SFR_DATA_0;
#ifdef REGDBG
	if (EA) { print_byte(sfr_data[0]);  print_byte(sfr_data[1]);  print_byte(sfr_data[2]);  print_byte(sfr_data[3]); write_char(' '); }
#endif
}


void reg_write(uint16_t reg_addr)
{
	/* Data to write must be in SFR A4, A5, A6, A7 */
	SFR_REG_ADDR_U16 = reg_addr;
	SFR_EXEC_GO = SFR_EXEC_WRITE_REG;
	do {
	} while (SFR_EXEC_STATUS != 0);
}


void reg_write_m(uint16_t reg_addr)
{
#ifdef REGDBG
	if (EA) {
		write_char('R'); print_byte(reg_addr >> 8); print_byte(reg_addr); write_char('-');
		print_byte(sfr_data[0]);  print_byte(sfr_data[1]);  print_byte(sfr_data[2]);  print_byte(sfr_data[3]); write_char(' ');
	}
#endif
	SFR_REG_ADDR_U16 = reg_addr;
	SFR_DATA_24 = sfr_data[0] ;
	SFR_DATA_16 = sfr_data[1];
	SFR_DATA_8 = sfr_data[2];
	SFR_DATA_0 = sfr_data[3];

	SFR_EXEC_GO = SFR_EXEC_WRITE_REG;
	do {
	} while (SFR_EXEC_STATUS != 0);
}


/*
 * This sets a bit in the 32bit wide switch register reg_addr
 */
void reg_bit_set(uint16_t reg_addr, char bit)
{
	uint8_t bit_mask = 1 << (bit & 0x7);

	bit >>= 3;
	reg_read_m(reg_addr);
	sfr_data[3-bit] |= bit_mask;
	reg_write_m(reg_addr);
}


/*
 * This sets a bit in the 32bit wide switch register reg_addr
 */
void reg_bit_clear(uint16_t reg_addr, char bit)
{
	uint8_t bit_mask = 1 << (bit & 0x7);

	bit >>= 3;
	reg_read_m(reg_addr);
	bit_mask = ~bit_mask;
	sfr_data[3-bit] &= bit_mask;
	reg_write_m(reg_addr);
}


/*
 * This tests a bit in the 32bit wide switch register reg_addr
 */
uint8_t reg_bit_test(uint16_t reg_addr, char bit)
{
	uint8_t bit_mask = 1 << (bit & 0x7);

	bit >>= 3;
	reg_read_m(reg_addr);
	bit_mask = bit_mask;
	if (sfr_data[3-bit] & bit_mask)
		return 1;
	return 0;
}


/*
 * This masks the sfr data fields, first &-ing with ~mask, then setting the bits in set
 */
void sfr_mask_data(uint8_t n, uint8_t mask, uint8_t set)
{
	uint8_t b = sfr_data[3-n];
	b &= ~mask;
	b |= set;
	sfr_data[3-n] = b;
}

/*
 * This zeros all the sfr data fields
 */
void sfr_set_zero(void) {
	uint8_t idx = 4;
	while (idx) {
		idx -= 1;
		sfr_data[idx] = 0;
	}
}


/*
 * Create 32 random number in sfr_data
 */
void get_random_32(void)
{
	// In order to get a new random numner, this bit has to be set each time!
	reg_bit_set(RTL837X_RLDP_RLPP, RLDP_RND_EN);
	reg_read_m(RTL837X_RAND_NUM0);
}


/*
 * Transfer Network Interface RX data from the ASIC to the 8051 XMEM
 * data will be stored in the rx_header structure
 * len is the length of data to be transferred
 */
bool nic_rx_header(uint16_t ring_ptr)
{
	uint16_t buffer = (uint16_t) &rx_headers[0];
	uint16_t guard = 0;

	SFR_NIC_DATA_U16LE = buffer;
	SFR_NIC_RING_U16LE = ring_ptr;
	SFR_NIC_CTRL = 1;
	while (SFR_NIC_CTRL != 0) {
		if (++guard == 0) {
			print_string("NIC: RX header transfer did not complete\n");
			return false;
		}
	}
	return true;
}


/*
 * Transfer Network Interface RX data from the ASIC to the 8051 XMEM
 * the description of the packet must be in the rx_headers data structure
 * data will be returned in the xmem buffer points to
 * ring_ptr is the current position of the RX Ring on the ASIC side
 */
bool nic_rx_packet(uint16_t buffer, uint16_t ring_ptr)
{
	uint16_t guard = 0;

	SFR_NIC_DATA_U16LE = buffer;
	SFR_NIC_RING_U16LE = ring_ptr;

	uint16_t len = (((uint16_t)rx_headers[5]) << 8) | rx_headers[4];
	len += 7;
	len >>= 3;
#ifdef RXTXDBG
	print_string(" len: ");
	print_short(len);
#endif
	SFR_NIC_CTRL = len;
	while (SFR_NIC_CTRL != 0) {
		if (++guard == 0) {
			print_string("NIC: RX transfer did not complete\n");
			return false;
		}
	}
	return true;
}


/*
 * Transfers data in XMEM to the ASIC for transmission by the nic
 */
void nic_tx_packet(uint16_t ring_ptr)
{
	uint16_t len;
	uint16_t guard = 0;

	/* A frame that got a dot1Q tag was shifted forward over its padding, so it
	 * starts at uip_buf and carries the q_frame layout. One that did not keeps
	 * the padding in front and the nonq_frame layout, so the padding is skipped.
	 */
	if (frame_tagged) {
		SFR_NIC_DATA_U16LE = (uint16_t) uip_buf;
		len = FRAME_Q->len;
		/*
		(__xdata struct rtl_dot1q_frame *)uip_buf
#define FRAME (((__xdata struct rtl_dot1q_frame *)&uip_buf[0]).nonq_frame)*/
	} else {
		SFR_NIC_DATA_U16LE = (uint16_t) uip_buf + VLAN_TAG_SIZE;
		len = FRAME->len;
	}

#ifdef RXTXDBG
	print_string("TX: \n");
	for (uint8_t i = 0; i < 100; i++) {
		print_byte(uip_buf[i]);
		write_char(' ');
	}
	write_char('\n');
#endif

	ring_ptr <<= 3;
	ring_ptr |= 0x8000;
	SFR_NIC_RING_U16LE = ring_ptr;

	len += 0xf;
	len >>= 3;
	SFR_NIC_CTRL = len;
	while (SFR_NIC_CTRL != 0) {
		if (++guard == 0) {
			print_string("NIC: TX transfer did not complete\n");
			return;
		}
	}
}


/* Read flash using the MMIO capabilities of the DW8051 core
 * Bank is < 0x3f and is the MSB
 * addr gives the address in the bank
 * Note that the address in the flash memory is not simply 0xbbaddr, because
 * the size of a bank is merely 0xc000.
 */
uint8_t read_flash(uint8_t bank, __code const uint8_t *addr)
{
	uint8_t v;
	uint8_t current_bank = PSBANK;

	PSBANK = bank;
	v = *addr;
	PSBANK = current_bank;
	return v;
}

/*
 * Read a SerDes register in the SoC
 * Input must be: sds_id = 0/1, page < 128,  reg <= 0xff
 * The result is in SFR A6 and A7 (SFR_DATA_8, SFR_DATA_0)
 */
void sds_read(uint8_t sds_id, uint8_t page, uint8_t reg)
{
#ifdef REGDBG
	print_string("q"); print_byte(sds_id); print_byte(page); print_byte(reg);
#endif
	SFR_93 = reg;			// 93
	SFR_94 = page << 1 | sds_id;	// 94
	SFR_EXEC_GO = SFR_EXEC_READ_SDS;
	do {
	} while (SFR_EXEC_STATUS != 0);

#ifdef REGDBG
	write_char(':'); print_byte(SFR_DATA_8); print_byte(SFR_DATA_0); write_char(' ');
#endif
}


/*
 * Write a SerDes register in the SoC
 * Input must be: sds_id = 0/1, page < 128,  reg <= 0xff
 * The value written must be in SFR A6 and A7 (SFR_DATA_8, SFR_DATA_0)
 */
void sds_write_v(uint8_t sds_id, uint8_t page, uint8_t reg, uint16_t v)
{
#ifdef REGDBG
	print_string("Q"); print_byte(sds_id); print_byte(page); print_byte(reg);
	write_char(':'); print_byte(v >> 8); print_byte(v); write_char(' ');
#endif
	SFR_DATA_U16 = v;
	SFR_93 = reg;
	SFR_94 = page << 1 | sds_id;
	SFR_EXEC_GO = SFR_EXEC_WRITE_SDS;
	do {
	} while (SFR_EXEC_STATUS != 0);
}


void print_sfr_data(void)
{
	write_char('0');
	write_char('x');
	print_byte(sfr_data[0]);
	print_byte(sfr_data[1]);
	print_byte(sfr_data[2]);
	print_byte(sfr_data[3]);
}


void print_phy_data(void)
{
	write_char('0');
	write_char('x');
	print_byte(SFR_DATA_8);
	print_byte(SFR_DATA_0);
}


void print_reg(uint16_t reg)
{
	reg_read_m(reg);
	print_sfr_data();
}

// Print the physical port of a logical port number.
void print_phys_port(uint8_t port)
{
	if (port < CPU_PORT)
		write_char(machine.log_to_phys_port[port] + '0');
	else if (port == CPU_PORT)
		print_string("CPU");
	else {
		print_string("UNKNOWN ");
		write_char(port + '0');
	}
}


/*
// TODO: This uses 2 DSEG bytes and is not used!
void print_sds_reg(uint8_t sds_id, uint8_t page, uint8_t reg)
{
	sds_read(sds_id, page, reg);
	print_phy_data();
}
*/

char cmp_4(__xdata uint8_t a[], __xdata uint8_t b[])
{
	for (uint8_t i = 0; i < 4; i++) {
		if (a[i] == b[i])
			continue;
		if (a[i] < b[i])
			return -1;
		else
			return 1;
	}
	return 0;
}

void cpy_4(__xdata uint8_t dest[], __xdata uint8_t source[])
{
	for (uint8_t i = 0; i < 4; i++)
		dest[i] = source[i];
}


void read_reg_timer(__xdata uint32_t * tmr)
{
	uint8_t * val = (uint8_t *)tmr;
	SFR_REG_ADDR_U16 = RTL837X_REG_SEC_COUNTER;
	SFR_EXEC_GO = SFR_EXEC_READ_REG;
	do {
	} while (SFR_EXEC_STATUS != 0);
	*val++ = SFR_DATA_0;
	*val++ = SFR_DATA_8;
	*val++ = SFR_DATA_16;
	*val = SFR_DATA_24;
}


// Delay for given number of ticks without doing housekeeping
void delay(uint16_t t)
{
	sleep_ticks = t;
	while (sleep_ticks > 0)
		PCON |= 1;
}



/*
 * Adds TX Header to uip_buf and calls nic_tx_packet to send the packet
 * over the wire
 */
void tcpip_output(void)
{
	// Add TX-TAG
	FRAME->tx_seq = tx_seq++;
	FRAME->chksum_flags = 0x07;    // Enable all checksums
	FRAME->reserved_1[0] = 0x00; FRAME->reserved_1[1] = 0x00;
	FRAME->len = uip_len;
	FRAME->reserved_2[0] = 0x00; FRAME->reserved_2[1] = 0x00;

	// For the management VLAN we insert an 802.1Q VLAN tag, but never into a
	// CPU-tagged frame, where the ASIC expects its tag right behind the addresses
	frame_tagged = false;
	if (management_vlan && FRAME_ETHERTYPE != HTONS(RTL_FRAME_TAG_ID)) {
		frame_tagged = true;
		// Shift the ethernet header before the HW type including the rtl_frame_desc to the beginning of uip_buf
		// to allow space to insert the dot 1Q tag
		for (uint8_t i = 0; i < sizeof(struct q_frame) - DOT_1Q_TAG_SIZE; i++)
			uip_buf[i] = uip_buf[i + DOT_1Q_TAG_SIZE];
		FRAME_Q->len += DOT_1Q_TAG_SIZE;
		FRAME_Q->tpid = HTONS(0x8100);  // Change ether-type to Dot1Q
		FRAME_Q->tci = HTONS(management_vlan);
	}

	reg_read_m(RTL837X_REG_CPU_TX_CURR_PKT);
	uint16_t ring_ptr = ((uint16_t)sfr_data[2]) << 8;
	ring_ptr |= sfr_data[3];

	// Move data over from xmem buffer to ASIC side using DMA
	nic_tx_packet(ring_ptr);

	// New position of the ring-pointer on the NIC-side indicates number of bytes transmitted
	reg_read_m(RTL837X_REG_NIC_TX_CURR_PKT);

	// Do actual TX of data on ASIC side
	REG_SET(RTL837X_REG_NIC_TXCMD, 1);
}


#define RX_BUDGET 4

void handle_rx(void)
{
	__xdata uint8_t budget = RX_BUDGET;

	while (budget--) {
		// Check the amount of data available on the NIC/ASIC side
		reg_read(RTL837X_REG_NIC_RX_BUFF_DATA);
		if (!SFR_DATA_U16)
			break;
		reg_read(RTL837X_REG_CPU_RX_CURR_PKT);
		uint16_t ring_ptr = SFR_DATA_U16;
		ring_ptr <<= 3;
		if (!nic_rx_header(ring_ptr)) {
			REG_SET(RTL837X_REG_NIC_RXCMD, 1);
			return;
		}
#ifdef RXTXDBG
		__xdata uint8_t *ptr = rx_headers;
		print_string("RX on port "); print_byte(rx_headers[3] & 0xf);
		print_string(": ");
		for (uint8_t i = 0; i < 8; i++) {
			print_byte(*ptr++);
			write_char(' ');
		}
#endif
		if (!nic_rx_packet((uint16_t) &uip_buf[0], ring_ptr + 8)) {
			REG_SET(RTL837X_REG_NIC_RXCMD, 1);
			return;
		}
		health_rx_frame();

#ifdef RXTXDBG
		print_string("\n<< ");
		ptr = &uip_buf[0];
		for (uint8_t i = 0; i < 80; i++) {
			print_byte(*ptr++);
			write_char(' ');
		}
#endif
		REG_SET(RTL837X_REG_NIC_RXCMD, 1);
		uip_len = (((uint16_t)rx_headers[5]) << 8) | rx_headers[4];

		rx_packet_vlan = NTOHS(ETH_IN->vlan_tag.vlan) & 0x0fff;

#ifdef RXTXDBG
		print_string(" RX-VLAN: "); print_short(rx_packet_vlan); write_char('\n');
		print_string(" RX dst: "); print_byte(uip_buf[0]); print_byte(uip_buf[1]); print_byte(uip_buf[2]);
		print_byte(uip_buf[3]); print_byte(uip_buf[4]); print_byte(uip_buf[5]); write_char('\n');
		print_string(" MGMT-VLAN: "); print_short(management_vlan); write_char('\n');
#endif
		if ((stp_enabled || lacpEnabled) && uip_buf[0] == 0x01 && uip_buf[1] == 0x80
			&& uip_buf[2] == 0xc2 && uip_buf[3] == 0x00 && uip_buf[4] == 0x00) { // 01:80:C2:00:00:0x
			if (stp_enabled && uip_buf[5] == 0x00) {		// STP/RSTP BPDU
				stp_in();
				if (uip_len) {
					print_string("STP TX\n");
					tcpip_output();
				}
			} else if (lacpEnabled && uip_buf[5] == 0x02) {	// LACPDU (slow protocols)
				lacp_in();
				if (uip_len)
					tcpip_output();
			}
		} else if (igmpEnabled && uip_buf[0] == 0x01 && uip_buf[1] == 0x00 && uip_buf[2] == 0x5e // IPv4-MC packet?
			&& igmp_packet_handler()) {
			if (uip_len) {
				tcpip_output();
			}
		} else if (ETH_IN->ether_type == HTONS(0x0806)) { // ARP
			uip_arp_arpin();
			if (uip_len) {
			    tcpip_output();
			}
		} else if (ETH_IN->ether_type == HTONS(0x0800)) { // IPv4
			if (!management_vlan || management_vlan == rx_packet_vlan) {
				uip_arp_ipin();
				uip_input();
				if (uip_len) {
					// Add ethernet frame
					uip_arp_out();
					tcpip_output();
				}
			}
		} else {
#ifdef RXTXDBG
			print_string("Unknown RX on port "); print_byte(rx_headers[3] & 0xf); write_char('\n');
#endif
		}
	}
}


void handle_tx(void)
{
	for(uint8_t i = 0; i < UIP_CONNS; i++) {
		uip_periodic(i);
		if(uip_len > 0) {
#ifdef RXTXDBG
			write_char('.'); print_short(i);
#endif
			uip_arp_out();
			tcpip_output();
		}
	}
	for(uint8_t i = 0; i < UIP_UDP_CONNS; i++) {
		uip_udp_periodic(i);
		if(uip_len > 0) {
			uip_arp_out();
			tcpip_output();
		}
	}
}



bool gpio_pin_test(uint8_t pin)
{
	reg_read_m(RTL837X_REG_GPIO_00_31_INPUT + (pin > 31 ? 4 : 0));
	return sfr_data[3-((pin >> 3) & 3)] & (1 << (pin & 7));
}


void flash_default_config(void)
{
	__xdata uint32_t source = DEFAULT_CONFIG_START;
	__xdata uint32_t dest = CONFIG_START;

	flash_region.addr = CONFIG_START;
	flash_sector_erase();

	for (uint8_t i = 0; i < 8; i++) // 8 * 512 Byte = 4 kByte (1 sector)
	{
		flash_region.addr = source;
		flash_region.len = FLASH_BUF_SIZE;
		flash_read_bulk(flash_buf);
		flash_region.addr = dest;
		flash_region.len = FLASH_BUF_SIZE;
		flash_write_bytes(flash_buf);
		dest += FLASH_BUF_SIZE;
		source += FLASH_BUF_SIZE;
	}

	print_string("Written default config to flash\n");
}

void handle_button(void)
{
	if (machine.reset_pin == GPIO_NA) {
		return;
	}

	bool button_pressed = !gpio_pin_test(machine.reset_pin);
	if (button_last != button_pressed)
	{
		print_string(button_pressed ? "Button pressed\n" : "Button released\n");
		reg_read_m(RTL837X_REG_SEC_COUNTER);
		uint8_t diff_sec_counter = sfr_data[3] - button_sec_counter_last;
		button_last = button_pressed;
		button_sec_counter_last = sfr_data[3];

		if (!button_pressed)
		{
			if (diff_sec_counter > 10)
			{
				print_string(">10s button detected; reverting to default settings:\n");
				flash_default_config();
				print_string("Now resetting...\n");
				reset_chip();
			}
			else if (diff_sec_counter > 3)
			{
				print_string(">3s button detected; resetting chip...\n");
				reset_chip();
			}
			else
			{
				print_string("Short button press detected; no action.\n");
				set_sys_led_state(SYS_LED_ON);
			}
		}
		else
		{
			// Give the user feedback for button press
			set_sys_led_state(SYS_LED_SLOW);
		}
	}
}

void check_links(void)
{
	reg_read_m(RTL837X_REG_LINKS_89);
	__xdata uint8_t linkbits_p89 = sfr_data[3];

	reg_read_m(RTL837X_REG_LINKS);
	if (cmp_4(sfr_data, linkbits_last) || (linkbits_p89 != linkbits_last_p89)) {
		print_string("\n<new link: ");
		print_byte(linkbits_p89); print_byte(sfr_data[0]); print_byte(sfr_data[1]);
		print_byte(sfr_data[2]); print_byte(sfr_data[3]);
		print_string(", was ");
		print_byte(linkbits_last_p89); print_byte(linkbits_last[0]); print_byte(linkbits_last[1]);
		print_byte(linkbits_last[2]); print_byte(linkbits_last[3]);
		print_string(">\n");
		linkbits_last_p89 = linkbits_p89;
		if (!machine_detected.isRTL8373 && machine.n_sfp != 2) {
			uint8_t p5 = sfr_data[2] >> 4;
			uint8_t p5_last = linkbits_last[2] >> 4;
			cpy_4(linkbits_last, sfr_data);
			// Handle link change of the RTL8221 PHY, adjust SDS mode, RTL8261BE always uses SDS_QXGMII
			if (!machine.n_10g && p5_last != p5) {
				if (p5 == 0x5)	// 2.5GBit Mode
					sds_config(0, SDS_HISGMII);
				else		// 1GBit and 100Mbit
					sds_config(0, SDS_SGMII);
			}
			if (machine.n_10g)
				sds_config(0, SDS_QXGMII);
			if (machine.n_10g == 2)
				sds_config(1, SDS_QXGMII);
		} else {
			cpy_4(linkbits_last, sfr_data);
		}
	}
}


//
// An idle function that sleeps for 1 tick and does all the house-keeping
//
static void handle_tick(void)
{
	if (sec_counter >= SYS_TICK_HZ) {
		sec_counter -= SYS_TICK_HZ;
		reg_read_m(RTL837X_REG_SEC_COUNTER);
		uint8_t v = sfr_data[3];
#ifdef DEBUG
		print_string("  Tick counter: "); print_long(ticks); write_char('\n');
#endif
		v++;
		sfr_data[3] = v;
		if (!v) {
			v = sfr_data[2];
			v++;
			sfr_data[2] = v;
			if (!v) {
				v = sfr_data[1];
				v++;
				sfr_data[1] = v;
				if (!v) {
					v = sfr_data[0];
					v++;
					sfr_data[0] = v;
				}
			}
		}
		reg_write_m(RTL837X_REG_SEC_COUNTER);
		reg_read_m(RTL837X_REG_SEC_COUNTER);

		// Check for button presses once a second
		handle_button();
		link_irq = 1;
		// Age the ARP cache: uip_arp_timer() expects a 10 s cadence
		if (++arp_age_secs >= 10) {
			arp_age_secs = 0;
			uip_arp_timer();
		}

#ifdef DEBUG
		print_sfr_data();
		write_char('\n');
#endif
	}

	health_phase(HEALTH_PH_LINK);
	if (TICKS_DUE(sfp_tick_last, SFP_TICK_STEP)) {
		sfp_tick_last += SFP_TICK_STEP;
		handle_sfp();
	}
	health_phase(HEALTH_PH_SFP);
	handle_tx();
	health_phase(HEALTH_PH_TX);
	if (stp_enabled) {
		uint8_t n = STP_CATCH_UP;
		while (n-- && TICKS_DUE(stp_tick_last, STP_TICK_STEP)) {
			stp_tick_last += STP_TICK_STEP;
			stp_timers();
		}
	}
	// If LACP enabled, drive its machines (own tick divider lives in the banked module)
	if (lacpEnabled)
		lacp_timers();
	health_phase(HEALTH_PH_STP);
	lldp_tick();
	health_phase(HEALTH_LLDP);
}


void idle(void)
{
	if (!evflags)
		PCON |= 1;
	health_loop_start();
	if (tick_pending) {
		tick_pending = 0;
		handle_tick();
	}
	if (link_irq) {
		link_irq = 0;
		REG_SET(RTL837X_ISR_INT_PORT_LINK_CHG, 0x3ff);
		EX0 = 1;
		check_links();
	}
	health_phase(HEALTH_PH_LINK);
	if (rx_irq) {
		rx_irq = 0;
		handle_rx();
		REG_SET(RTL837X_NIC_INT_STS, NIC_INT_RXIS);
		reg_read(RTL837X_REG_NIC_RX_BUFF_DATA);
		if (SFR_DATA_U16)
			rx_irq = 1;
		else
			EX1 = 1;
	}
	health_phase(HEALTH_PH_RX);
	if (cmd_available) {
		cmd_available = 0;
		cmd_tokenize();
		if (err_status == ERR_OK)
			cmd_parser();
		print_cmd_prompt();
	}
	health_phase(HEALTH_PH_CMD);
}


// Sleep the given number of ticks and perform idle tasks if initialized
void sleep(uint16_t t)
{
	sleep_ticks = t;
	while (sleep_ticks > 0) {
		if (idle_ready)
			idle();
		else
			PCON |= 1;
	}
}


void reset_chip(void)
{
	REG_SET(RTL837X_REG_RESET, 1);
	while(1);
}


void setup_external_irqs(void)
{
	REG_SET(RTL837X_ISR_SW_INT_MODE, 0x42);
	REG_SET(RTL837X_ISR_INT_PORT_LINK_CHG, 0x3ff);
	REG_SET(RTL837X_IMR_INT_PORT_LINK_STS_CHG, 0x3ff);

	link_irq = 1;
	IT0 = 1;	// External IRQ 0 on falling edge (link change)
	EX0 = 1;

	rx_irq = 1;
	EX1 = 1;	// External IRQ 1: the NIC has received a packet
	EX2 = 1;	// External IRQ 2 enable: bit EIE.0
	EX3 = 1;	// External IRQ 3 enable: bit EIE.1
	PX3 = 1;	// Set EIP.1 = 1: External IRQ 3 set to high priority
}


/*
 * Set dividers for a chosen CPU frequency
 */
void setup_clock(void)
{
	reg_read_m(RTL837X_REG_HW_CONF);
	sfr_mask_data(0, 0x30, 0);
#if CLOCK_DIV != 0
	 // Divider in bits 4 & 5
	sfr_mask_data(0, 0, CLOCK_DIV << 4);
#endif
	// Bit 8 is set in managed mode 125MHz to use fast SPI mode
	sfr_mask_data(1, 0, 0x01);
	reg_write_m(RTL837X_REG_HW_CONF);

	// Enable serial interface, set bit 0
	reg_read_m(RTL837X_PIN_MUX_1);
	sfr_mask_data(0, 0x1, 0x1);
	reg_write_m(RTL837X_PIN_MUX_1);
}


/*
 * Write a register reg of multipule phys, using a mask to select them, in page page
 * Data to be written is in v
 */
void phy_write_mask(uint16_t phy_mask, uint8_t dev_id, uint16_t reg, uint16_t v)
{
#ifdef REGDBG
	print_string("P"); print_byte(phy_mask>>8); print_byte(phy_mask); print_byte(dev_id); write_char('.'); print_byte(reg>>8); print_byte(reg); write_char(':');
	print_byte(v>>8); print_byte(v); write_char(' ');
#endif
	SFR_DATA_U16 = v;			    // SFR_A6, SFR_A7
	SFR_SMI_PHYMASK = phy_mask;		// SFR_C5
	SFR_SMI_REG_U16 = reg;			// SFR_C2, SFR_C3
	SFR_SMI_DEV = (phy_mask >> 8) | dev_id  << 3 | 2; // SFR_C4: bit 2 can also be set for some option
	SFR_EXEC_GO = SFR_EXEC_WRITE_SMI;
	do {
	} while (SFR_EXEC_STATUS != 0);
}

/*
 * Write a register reg of phy, using a mask to select them, in page page
 * Data to be written is in v
 */
void phy_write(uint8_t phy_id, uint8_t dev_id, uint16_t reg, uint16_t v)
{
	uint16_t phy_mask =  bit_mask[phy_id];
#ifdef REGDBG
	print_string("P"); print_byte(phy_mask>>8); print_byte(phy_mask); print_byte(dev_id); write_char('.'); print_byte(reg>>8); print_byte(reg); write_char(':');
	print_byte(v>>8); print_byte(v); write_char(' ');
#endif
	SFR_DATA_U16 = v;			    // SFR_A6, SFR_A7
	SFR_SMI_PHYMASK = phy_mask;		// SFR_C5
	SFR_SMI_REG_U16 = reg;			// SFR_C2, SFR_C3
	SFR_SMI_DEV = (phy_mask >> 8) | dev_id  << 3 | 2; // SFR_C4: bit 2 can also be set for some option
	SFR_EXEC_GO = SFR_EXEC_WRITE_SMI;
	do {
	} while (SFR_EXEC_STATUS != 0);
}


/*
 * Read a phy register via MDIO clause 45
 * Input must be: phy_id < 64,  device_id < 32,  reg < 0x10000)
 * The result is in SFR A6 and A7 (SFR_DATA_8, SFR_DATA_0)
 */
void phy_read(uint8_t phy_id, uint8_t dev_id, uint16_t reg)
{
#ifdef REGDBG
	print_string("p"); print_byte(phy_id); print_byte(dev_id); write_char('.'); print_byte(reg>>8); print_byte(reg); write_char(':');
#endif
	SFR_SMI_REG_U16 = reg;		// c2, c2

	SFR_SMI_PHY = phy_id;		// a5
	SFR_SMI_DEV = dev_id << 3 | 2;	// c4

	SFR_EXEC_GO = SFR_EXEC_READ_SMI;
	do {
	} while (SFR_EXEC_STATUS != 0);
#ifdef REGDBG
	print_byte(SFR_DATA_8); print_byte(SFR_DATA_0); write_char(' ');
#endif
}

/*
 * Modify a register reg of phy phy_id, in page page
 * Set: bit mask of bits to set.
 * Mask: bit mask of bits to clear.

 * Note: We assume that the registers `SFR_SMI_REG_U16`, `SFR_SMI_PHY` and `SFR_SMI_DEV` 
 * keep there value, and dont have to be rewritten everytime.
 */
void phy_modify(uint8_t phy_id, uint8_t dev_id, uint16_t reg, uint16_t mask, uint16_t set)
{
	uint8_t smi_phy = dev_id << 3 | 2;

	// Read the data
	SFR_SMI_REG_U16 = reg;		// c2, c2
	SFR_SMI_PHY = phy_id;		// a5
	SFR_SMI_DEV = smi_phy;		// c4
	SFR_EXEC_GO = SFR_EXEC_READ_SMI;
	do {
	} while (SFR_EXEC_STATUS != 0);

	// Modify the reed data.
	// TODO: Check if we directly can modify SFR register directly.
	uint16_t data = SFR_DATA_U16 & ~(mask);
	data |= set;

	uint16_t phy_mask = bit_mask[phy_id];

	// Write it back
	SFR_SMI_REG_U16 = reg;
	SFR_DATA_U16 = data;
	SFR_SMI_PHYMASK = phy_mask;		// SFR_C5
	SFR_SMI_DEV = smi_phy | (phy_mask >> 8);
	SFR_EXEC_GO = SFR_EXEC_WRITE_SMI;
	do {
	} while (SFR_EXEC_STATUS != 0);
}


void set_sys_led_state(uint8_t state)
{
	reg_read_m(RTL837X_REG_LED_MODE);
	sfr_mask_data(2, 0x03, state);
	reg_write_m(RTL837X_REG_LED_MODE);
}




/* Set up serial port 0 using Timer 1 as baudrate generator.
 * For x Bd these settings are needed, see table below.
 * NOTE: Settings only valid for F_SYS = 125 MHz!
 * |   Wanted |       | TMR | F_SYS |      |   Actual |        |
 * | baudrate | SMOD0 | DIV |   DIV |  TH1 | baudrate |  Error |
 * | -------- | ----- | --- | ----- | ---- | -------- | ------ |
 * |     1200 |   0   |  12 |   255 | 0x01 |   1276.6 |  6.00% |
 * |     2400 |   0   |  12 |   136 | 0x78 |   2393.5 | −0.27% |
 * |     4800 |   0   |   4 |   203 | 0x35 |   4810.7 |  0.22% |
 * |     9600 |   1   |   4 |   203 | 0x35 |   9621.3 |  0.22% |
 * |    14400 |   1   |   4 |   136 | 0x78 |  14361.2 | −0.27% |
 * |    19200 |   1   |   4 |   102 | 0x9a |  19148.3 | −0.27% |
 * |    38400 |   1   |   4 |    51 | 0xcd |  38296.6 | −0.27% |
 * |    57600 |   1   |   4 |    34 | 0xde |  57444.9 | −0.27% |
 * |   115200 |   1   |   4 |    17 | 0xef | 114889.7 | −0.27% |
 */
#if CLOCK_HZ != 125000000
#warning "SERIAL 0 baudrate setting may only valid for F_CPU = 125 MHz!"
#endif
void setup_serial_timer1(void)
{
	// Timer 1: Mode 2: automatic reload
	TMOD &= 0x0F;
	TMOD |= 0x20; // Timer1: Mode2: Timer, 8-bit with auto-reload
	CKCON |= 0x10; // Timer1 clock divider: F_SYS / 4: T2M = 1, Timer 1 uses clk/4

	PCON |= 0x80; // SMOD0 = 1; Double the Baud Rate, don't divide Timer 1 Overflag signal.

	SCON  = 0x50;  // Mode = 1: ASYNC 8N1 with Timer 2 as baud-rate generator, REN_0 Receive enable

	/* The TH1 register contain the reload value, timer1 when T1 overflows to 0x100.
	 * NOTE: compiler computs the wrong value. 0xF0 is calculated but 0xEF is the right value for 115200.
	 * Also https://www.keil.com/products/c51/baudrate.asp confirms this.
	 * Added 32 before div by 64 to make sure rounding is correct so that the results are right.
	 *
	 * TH1 = 0x100 - (2^SMOD0 * F_SYS) / ( TMR1_DIV / BAUDRATE * 32)
	 */
	TH1 = (0x100 - (((CLOCK_HZ / SERIAL_BAUD_RATE) + 32) / (4 * 16))) & 0xff;

	TCON |= 0x40;	// Start timer 1

	ET1 = 0; // Timer1 Interrupt is NOT wanted!
	TI = 0; // Clear TI-interrupt flag
	RI = 0; // Clear RI-interrupt flag

	tx_buf_empty = 1; // Set tx `serial buffer is empty`-software flag.

	ES = 1; // Enable serial IRQ
}


void check_and_flash_update_image(void)
{
	flash_read_jedecid(); // This initializes also __xdata flash_size variable

	print_string(get_flash_size_str()); print_string(" flash size detected. (1 MB is needed for image updating)\n");
	if (flash_size < FIRMWARE_UPLOAD_START*2) {
		print_string("Flash too small for updating; skipping update check\n");
		return;
	}

	print_string("Checking for update image in flash... ");
	// Check if an update image is in flash
	flash_region.addr = FIRMWARE_UPLOAD_START;
	flash_region.len = 0x100;
	flash_read_bulk(flash_buf);
	if (flash_buf[0] == 0x00 && flash_buf[1] == 0x40)
	{
		// Yes, flash the new image to the start of flash and reset
		__xdata uint32_t dest = 0x0;
		__xdata uint32_t source = FIRMWARE_UPLOAD_START;
		__xdata uint16_t i = 0;
		__xdata uint16_t j = 0;
		__xdata uint8_t * __xdata bptr;
		print_string("found update image!\nChecking integrity");
		flash_init(0); // Re-initialize flash for non-DIO operation, otherwise flashing will fail
		set_sys_led_state(SYS_LED_FAST);
		crc_value = 0x0000;
		for (i = 0; i < 1024; i++) {
			flash_region.addr = source;
			flash_region.len = FLASH_BUF_SIZE;
			flash_read_bulk(flash_buf);
			bptr = flash_buf;
			for (j = 0; j < FLASH_BUF_SIZE; j++) {
				crc16_bank1(bptr++);
			}
			source += FLASH_BUF_SIZE;
			if (i%16 == 0) write_char('.');
		}
		if (crc_value == 0xb001) {
			print_string("Checksum OK.\nUpdate in progress, moving firmware to start of flash");
			source = FIRMWARE_UPLOAD_START;
			// Don't copy the config area at the end of flash
			for (i = 0; i < CONFIG_START/FLASH_BUF_SIZE; i++) {
				flash_region.addr = source;
				flash_region.len = FLASH_BUF_SIZE;
				flash_read_bulk(flash_buf);
				if (i%8 == 0) {
					flash_region.addr = dest;
					flash_sector_erase();
					if (i%16 == 0) write_char('.');
				}
				flash_region.addr = dest;
				flash_region.len = FLASH_BUF_SIZE;
				flash_write_bytes(flash_buf);
				dest += FLASH_BUF_SIZE;
				source += FLASH_BUF_SIZE;
			}
			print_string("Done.\nDeleting uploaded flash image");
			dest = FIRMWARE_UPLOAD_START;
			for (register uint8_t i=0; i < 128; i++) // TODO: Erasing the entire 512kByte upload area is probably not necessary
			{
				flash_region.addr = dest;
				flash_sector_erase();
				dest += 0x1000;
				if (i%4 == 0) write_char('.');
			}
			print_string("Done.\nResetting now");
			delay(200);
			reset_chip();
		}
		print_string("Checksum incorrect, please upload the image again\n");
		print_string("Erasing bad uploaded flash image\n");
		dest = FIRMWARE_UPLOAD_START;
		for (register uint8_t i=0; i < 128; i++) {
			flash_region.addr = dest;
			flash_sector_erase();
			dest += 0x1000;
		}
	}
	else
	{
		print_string("no update image found.\n");
	}
}



void main(void)
{
	ticks = 0;
	stp_tick_last = (uint8_t)ticks;
	sfp_tick_last = (uint8_t)ticks;
	dhcp_state.state = DHCP_OFF;
	sbuf_ptr = 0;

	CKCON = 0;	// Initial Clock configuration
	SFR_97 = 0;	// HADDR?

	// Set in managed mode:
	SFR_b9 = 0x00;
	SFR_ba = 0x80;

	// Disable all interrupts (global and individually) by setting IE register (SFR A8) to 0
	IE = 0;
	EIE = 0;  // SFR e8: EIE. Disable all external IRQs

	idle_ready = 0;
	// HW setup, serial, timer, external IRQs
	setup_clock();
	setup_timer2();
	setup_serial_timer1();
	setup_external_irqs();

	EA = 1; // Enable global interrupt

	// Flash controller should be initialized before any code in other banks is being fetched
	// See this issue: https://github.com/logicog/RTLPlayground/issues/70
	print_string("\nInitializing Flash controller\n");
	flash_init(1);

	// Set default for SFP pins so we can start up a module already inserted
	sfp_pins_last = 0x33; // signal LOS and no module inserted (for both slots, even if only 1 present)
	// We have not detected any link
	linkbits_last[0] = linkbits_last[1] = linkbits_last[2] = linkbits_last[3] = linkbits_last_p89 = 0;

	button_last = 0;
	button_sec_counter_last = 0;

	machine_detected.isRTL8373 = 0;
	machine_detected.isN = 0;
	print_string("Detecting CPU: RTL837");
	reg_read_m(RTL837X_REG_CHIP_ID);
	if (sfr_data[1] == 0x73) { // Register was 0x8373xx00
		machine_detected.isRTL8373 = 1;
		write_char('3');
	} else {
		write_char('2');
	}
	// Detect non-N/N chip, 0xxxxx70xx
	if (sfr_data[2] == 0x70) {
		machine_detected.isN = 1;
		write_char('N');
	}
	write_char('\n');
	if (machine.isRTL8373 != machine_detected.isRTL8373) {
		print_string("INCORRECT MACHINE!");
	}
	if (machine_detected.isRTL8373) {
		rtl8224_enable();  // Power on the RTL8224
	}

	// Print SW version
	print_sw_version();

	// Set AUTONEG for SFP ports
	sfp_speed[0] = sfp_speed[1] = SFP_SPEED_AUTO;
	// Reset NIC
	reg_bit_set(RTL837X_REG_RESET, RESET_NIC_BIT);
	do {
		reg_read(RTL837X_REG_RESET);
	} while (SFR_DATA_0 & (1 << RESET_NIC_BIT));
	print_string("NIC reset\n");

	uip_ipaddr(&uip_hostaddr, ownIP[0], ownIP[1], ownIP[2], ownIP[3]);
	uip_ipaddr(&uip_draddr, gatewayIP[0], gatewayIP[1], gatewayIP[2], gatewayIP[3]);
	uip_ipaddr(&uip_netmask, netmask[0], netmask[1], netmask[2], netmask[3]);
	uip_ethaddr.addr[0] = 0xff;
	if (machine.mac_flash_offset) {
		flash_region.addr = machine.mac_flash_offset;
		flash_region.len = FLASH_BUF_SIZE;
		flash_read_bulk(flash_buf);
		// accept only a real unicast, globally-administered address (reject blank/LAA/multicast/all-zero OUI)
		if (flash_buf[0] != 0xff && !(flash_buf[0] & 0x03) && (flash_buf[0] | flash_buf[1] | flash_buf[2])) {
			uip_ethaddr.addr[0] = flash_buf[0]; uip_ethaddr.addr[1] = flash_buf[1];
			uip_ethaddr.addr[2] = flash_buf[2]; uip_ethaddr.addr[3] = flash_buf[3];
			uip_ethaddr.addr[4] = flash_buf[4]; uip_ethaddr.addr[5] = flash_buf[5];
		}
	}
	if (uip_ethaddr.addr[0] == 0xff) {  // no valid flash MAC -> generate locally-administered
		reg_read_m(RTL837X_REG_CHIP_UUID);
		uip_ethaddr.addr[0] = 0x06;  // LAA prefix
		uip_ethaddr.addr[3] = sfr_data[0] ^ sfr_data[3];
		uip_ethaddr.addr[4] = sfr_data[1] ^ sfr_data[3];
		uip_ethaddr.addr[5] = sfr_data[2] ^ sfr_data[3];
		reg_read_m(RTL837X_REG_CHIP_LOT_NO);
		uip_ethaddr.addr[1] = sfr_data[0] ^ sfr_data[2];
		uip_ethaddr.addr[2] = sfr_data[1] ^ sfr_data[3];
	}
	print_string("Setting MAC to: ");
	print_byte(uip_ethaddr.addr[0]); write_char(':'); print_byte(uip_ethaddr.addr[1]); write_char(':');
	print_byte(uip_ethaddr.addr[2]); write_char(':'); print_byte(uip_ethaddr.addr[3]); write_char(':');
	print_byte(uip_ethaddr.addr[4]); write_char(':'); print_byte(uip_ethaddr.addr[5]); write_char('\n');

	REG_SET(RTL837X_PIN_MUX_2, 0x0); // Disable pins for ACL
	init_smi();
	if (machine_detected.isRTL8373)
		rtl8224_wait_ready();

	rtl8373_revision();

	leds_setup();
	machine_custom_init();

	set_sys_led_state(SYS_LED_SLOW);

	if (machine_detected.isRTL8373)
		rtl8373_init();
	else
		rtl8372_init();
	delay(1000);

	check_and_flash_update_image();

	syslog_init();
	dns_init();
	ntp_init();

#ifdef DEBUG
	// This register seems to work on the RTL8373 only if also the SDS
	// Is correctly configured. Therefore, we can test it, here...
	// Reset seconds counter
	print_string("\nTIMER-TEST: \n");
	REG_SET(RTL837X_REG_SEC_COUNTER, 0x0);
	delay(100);
	print_reg(RTL837X_REG_SEC_COUNTER); write_char(' ');
	REG_SET(RTL837X_REG_SEC_COUNTER, 0x1);
	delay(100);
	print_reg(RTL837X_REG_SEC_COUNTER);
	REG_SET(RTL837X_REG_SEC_COUNTER, 0x2); write_char(' ');
	delay(100);
	print_reg(RTL837X_REG_SEC_COUNTER);
	REG_SET(RTL837X_REG_SEC_COUNTER, 0x3); write_char(' ');
	print_reg(RTL837X_REG_SEC_COUNTER);
#endif
	stp_enabled = 0;
	stp_defaults();		/* 802.1D/w default config before any "stp ..." replay */
	lacpEnabled = 0;
	lacp_init();		/* clear per-LAG state (port->LAG map = NONE) before any config replay */
	nic_setup();
	REG_SET(RTL837X_NIC_INT_MSK, NIC_INT_RXIE);
	trap_init();
	vlan_setup();
	port_l2_setup();
	igmp_setup();
	bandwidth_setup();
	uip_init();
	uip_arp_init();
	httpd_init();
	lldp_init();

	management_vlan = 1; // Default management VLAN is 1

	setup_i2c();
	setup_sfp_gpio();
	print_string(greeting);

	print_string("\nClock register: ");
	print_reg(0x6040);
	print_string("\nRegister 0x7b20/RTL837X_REG_SDS_MODES: ");
	print_reg(0x7b20);

	print_string("\nVerifying PHY settings:\n");
//	p031f.a610:2058 p041f.a610:2058  p051f.a610:2058  r4f3c:00000000 p061f.a610:2058 p071f.a610:2058 
	port_stats_print();

	early_boot_handle_button();

	execute_config();
	// After the config so the entry lands in the final management VLAN
	port_l2_static_mgmt(uip_ethaddr.addr, management_vlan, false);
	/* After the config: a name from it wins, otherwise derive one. */
	set_hostname_default();
	print_cmd_prompt();
	idle_ready = 1;

	set_sys_led_state(SYS_LED_ON);

	cmd_editor_init();

	health_stack_paint();
	while (1) {
		cmd_edit();
		idle(); // Enter Idle mode until interrupt occurs
	}
}