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Add support for command line editing

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The current code for entering commands via the serial CLI is completely
refactored and moved out of rtlplayground.c into a separate file cmd_edit.c
putting code into BANK2.
The serial ring buffer sbuf[] is now exclusively used for receiving
keys, including escape sequences (DEL will generate a 4-byte escape
sequence). The command is now held in cmd_buffer. This reduces
XMEM use, because the serial buffer can be much smaller.

Supported is only editing the current command line via backspace, del,
cursor left and right.

Because the code cannot distinguish escape sequences which are not yet
complete (because the serial isr has not yet put all characters into
the serial buffer) from the dozens of unsupported ones (F-keys/home,
Page up/down, cursor up/down...) they are ignored and remain in the
serial buffer until the ring-pointer overwrites them. This is standard
behaviour for consoles, which will print out garbage for unsupported
characters. In this implementation, the command line buffer and the
visible command line in the terminal are always synced, so garbage
can be removed again by ediing the line.

The code makes several redundant checks in order to prevent race-conditions
between the serial ISR and the comand-editing code.
This commit is contained in:
logicog
2026-02-24 19:57:22 +01:00
parent 284b2b003d
commit 94d4ace88b
8 changed files with 176 additions and 56 deletions
Download Patch File Download Diff File Expand all files Collapse all files
rtl837x_common.h
+14 -4
View File
@@ -19,9 +19,19 @@
#define LOOKUP_MISS_DROP_9 0x00015555
#define LOOKUP_MISS_FLOOD 0x00000000
// The serial buffer. Defines the command line size
// Must be 2^x and <= 128
#define SBUF_SIZE 128
/* 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 (3 to 4) being sent via the serial line, so this must be
* sufficiently large */
#define SBUF_SIZE 16
#define SBUF_MASK (SBUF_SIZE - 1)
extern __xdata volatile uint8_t sbuf_ptr;
extern __xdata uint8_t sbuf[SBUF_SIZE];
// Define the command buffer size, Must be 2^x and <= 128
#define CMD_BUF_SIZE 128
// Size of the TCP Output buffer
#define TCP_OUTBUF_SIZE 2500
@@ -90,6 +100,7 @@ extern __xdata struct uip_eth_addr uip_ethaddr;
// Headers for calls in the common code area (HOME/BANK0)
void print_string(__code char *p);
void print_string_x(__xdata char *p);
void print_long(__xdata uint32_t a);
void print_short(uint16_t a);
void print_byte(uint8_t a);
@@ -121,7 +132,6 @@ uint16_t strlen(register __code const char *s);
uint16_t strlen_x(register __xdata const char *s);
uint16_t strtox(register __xdata uint8_t *dst, register __code const char *s);
void tcpip_output(void);
void print_string_x(__xdata char *p);
uint8_t read_flash(uint8_t bank, __code uint8_t *addr);
void get_random_32(void);
void read_reg_timer(uint32_t * tmr);