dennisgunia/split-flap-controller
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add documentation

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Dennis Gunia
2025-09-19 00:19:07 +02:00
parent 152398c0af
commit 8330fcbd43
1 changed files with 9 additions and 6 deletions
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13
software/pc_client/src/sfbus.c
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@@ -157,7 +157,7 @@ void sfbus_send_frame_v2(int fd, u_int16_t address, u_int8_t length, char *buffe
// add crc to end of frame
u_int16_t crc = calc_CRC16(buffer, length); // calculate CRC
*(frame + (frame_size_complete - 1)) = (crc); // addres high byte
*(frame + (frame_size_complete - 1)) = (crc); // address high byte
*(frame + (frame_size_complete - 0)) = ((crc >> 8)); // address low byte
// send data
@@ -166,14 +166,17 @@ void sfbus_send_frame_v2(int fd, u_int16_t address, u_int8_t length, char *buffe
free(frame); // free frame buffer
}
/*
* Send ping to device at specified address.
* returns 0 on success, else 1.
*/
int sfbus_ping(int fd, u_int16_t address)
{
char *cmd = "\xFE";
char *buffer = malloc(64);
char *cmd = "\xFE"; // command byte for ping
char *buffer = malloc(64); // allocate rx buffer
sfbus_send_frame_v2(fd, address, strlen(cmd), cmd);
int len = sfbus_recv_frame_wait(fd, 0xFFFF, buffer);
if (len == 4 && *buffer == (char)0xFF)
if (len == 4 && *buffer == (char)0xFF) // expect 0xFF on successful ping
{
printf("Ping okay!\n");
free(buffer);