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Merge pull request #499 from DrDoof/up/nic-rx-irq

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rtlplayground: receive on the NIC interrupt instead of polling the buffer
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René van Dorst authored and GitHub committed 2026-09-23 18:32:47 +00:00
2 parents c43b955db0 6e2701bc8c
commit e406a3e82b
4 files changed
+28 -23
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rtlplayground.c
+23 -21
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@@ -137,13 +137,15 @@ __code const uint16_t bit_mask[16] = {
__xdata uint8_t linkbits_last[4];
__xdata uint8_t linkbits_last_p89;
volatile __bit link_irq;
__xdata uint8_t idle_tick_last;
__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;
__bit rx_seen;
struct eth_in {
@@ -201,6 +203,7 @@ void isr_timer0(void) __interrupt(1)
void isr_timer2(void) __interrupt(5)
{
ticks++;
tick_pending = 1;
if (sleep_ticks > 0)
sleep_ticks--;
sec_counter++;
@@ -511,9 +514,8 @@ void isr_ext0(void) __interrupt(0)
*/
void isr_ext1(void) __interrupt(2)
{
// This flag should only be reset after all packets have been read
EX1 = 0;
EX1 = 1;
rx_irq = 1;
}
/*
@@ -997,14 +999,10 @@ void handle_rx(void)
__xdata uint8_t budget = RX_BUDGET;
while (budget--) {
if (rx_seen) {
rx_seen = 0;
} else {
// Check the amount of data available on the NIC/ASIC side
reg_read(RTL837X_REG_NIC_RX_BUFF_DATA);
if (!SFR_DATA_U16)
break;
}
// 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;
@@ -1284,13 +1282,11 @@ static void handle_tick(void)
void idle(void)
{
reg_read(RTL837X_REG_NIC_RX_BUFF_DATA);
rx_seen = SFR_DATA_U16 != 0;
if (!rx_seen)
if (!evflags)
PCON |= 1;
health_loop_start();
if (TICKS_DUE(idle_tick_last, 1)) {
idle_tick_last = (uint8_t)ticks;
if (tick_pending) {
tick_pending = 0;
handle_tick();
}
if (link_irq) {
@@ -1300,7 +1296,12 @@ void idle(void)
check_links();
}
health_phase(HEALTH_PH_LINK);
handle_rx();
if (rx_irq) {
rx_irq = 0;
handle_rx();
REG_SET(RTL837X_NIC_INT_STS, NIC_INT_RXIS);
EX1 = 1;
}
health_phase(HEALTH_PH_RX);
if (cmd_available) {
cmd_available = 0;
@@ -1343,7 +1344,8 @@ void setup_external_irqs(void)
IT0 = 1; // External IRQ 0 on falling edge (link change)
EX0 = 1;
EX1 = 1; // External IRQ 1 enable
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
@@ -1625,7 +1627,6 @@ void main(void)
{
ticks = 0;
stp_tick_last = (uint8_t)ticks;
idle_tick_last = (uint8_t)ticks;
sfp_tick_last = (uint8_t)ticks;
dhcp_state.state = DHCP_OFF;
sbuf_ptr = 0;
@@ -1772,6 +1773,7 @@ void main(void)
stp_enabled = 0;
stp_defaults(); /* 802.1D/w default config before any "stp ..." replay */
nic_setup();
REG_SET(RTL837X_NIC_INT_MSK, NIC_INT_RXIE);
vlan_setup();
port_l2_setup();
igmp_setup();