fix: Corrected I3C checksum

app/src/i3c/i3c.c

@@ -6,6 +6,8 @@
 
 #include "checksum.h"
 
+#define OWN_ADDRESS (0x01)
+
 uint8_t i3c_crc(uint8_t dst, uint8_t *msg, size_t len) {
     uint8_t crc;
     crc8_init(&crc);
@@ -25,6 +27,7 @@ bool i3c_validate(uint8_t *msg, size_t len)
     uint8_t rcvd_crc8 = msg[2];
     msg[2] = 0;
     crc8_init(&computed_crc8);
+    crc8_add(&computed_crc8, OWN_ADDRESS);
     crc8_addSlice(&computed_crc8, msg, len);
     crc8_finish(&computed_crc8);
     msg[2] = rcvd_crc8;

app/src/incp_handler.c

@@ -28,6 +28,7 @@ void handle_incp(msg_buf_t *msgs)
 	// Check I3C
 	if (!i3c_validate(msg, len))
 	{
+		HAL_GPIO_WritePin(LD2_GPIO_Port, LD2_Pin, GPIO_PIN_SET);
 		//return; // Ignore failed messages
 	}
 
@@ -56,7 +57,7 @@ static void handle_msg(uint8_t sender, uint8_t *bytes, uint32_t len)
 
 		bytes[-3] = I2C_OWN_ADDR;
 		bytes[-2] = len;
-		bytes[-1] = i3c_crc(I2C_OWN_ADDR, bytes, len);
+		bytes[-1] = i3c_crc(sender, bytes-I3C_HEADER_SIZE, len+I3C_HEADER_SIZE);
 		I2C1_transmit_master(sender, bytes-I3C_HEADER_SIZE, len+I3C_HEADER_SIZE);
 		break;