Heartbeat

Author: Kaweees

firmware/chipignite/polysat/include/slip.h

@@ -40,6 +40,8 @@ typedef enum slip_cmd_t {
   SLIP_CMD_NACK = (uint8_t)0x03,
   /* End of transmission command */
   SLIP_CMD_EOT = (uint8_t)0x04,
+  /* Heartbeat command */
+  SLIP_CMD_HEARTBEAT = (uint8_t)0x05,
 } slip_cmd_t;
 
 /* Represents a SLIP packet header (stored in big-endian/network-order) */
@@ -65,6 +67,7 @@ typedef struct slip_packet_t {
 /* Begin function prototype declarations */
 
 extern void slip_send_packet(const uint8_t* data, uint16_t data_len, uint8_t cmd, void (*send_byte)(uint8_t));
+extern void slip_send_heartbeat(void (*send_byte)(uint8_t));
 extern uint16_t crc16_ccitt_false(const uint8_t* data, uint16_t len);
 extern void slip_receive_packet(uint8_t input_byte, slip_packet_t* decoded_packet, uint8_t (*read_byte)(void));
 

firmware/chipignite/polysat/src/slip.c

@@ -58,6 +58,16 @@ void slip_send_packet(const uint8_t* data, uint16_t data_len, uint8_t cmd, void
   send_byte(SLIP_END);
 }
 
+/** @brief Send a heartbeat packet
+ *
+ * Sends a heartbeat packet to the host.
+ *
+ * @param send_byte A function to send a byte to the output stream.
+ */
+void slip_send_heartbeat(void (*send_byte)(uint8_t)) {
+  slip_send_packet(NULL, 0, SLIP_CMD_HEARTBEAT, send_byte);
+}
+
 /** @brief Compute a CRC-16/CCITT-FALSE checksum
  *
  * Cyclic Redundancy Check (CRC) is checksum algorithm used to detect errors in data transmissions.