dosimeter/stm32workspace/dosim-v1/Core/Src/commprt.c

/*
 * commprt.c
 *
 *  Created on: Jan 25, 2022
 *      Author: radioman
 */

#include <string.h>
#include "stm32l1xx_hal.h"
#include "commprt.h"
#include "uartio.h"
#include "usbd_cdc_if.h"

#define COMM_HEADER_BYTE	0x55;
#define COMM_BUFFER_SIZE	260

extern UART_HandleTypeDef huart1;

static uint8_t comm_buffer[COMM_BUFFER_SIZE];

uint8_t COMM_Checksum(const uint8_t *data, uint8_t len)
{
	uint8_t chk = 0;
	while(len--)
		chk ^= data[len];
	return chk;
}

COMM_StatusTypeDef COMM_Receive(uint8_t *buf, COMM_IfaceTypeDef iface)
{
	return COMM_OK;
}

COMM_StatusTypeDef COMM_Transmit(uint8_t *data, uint8_t len, COMM_IfaceTypeDef iface)
{
	comm_buffer[0] = COMM_HEADER_BYTE;
	comm_buffer[1] = len;
	memcpy(&comm_buffer[2], data, len);
	comm_buffer[len + 2] = COMM_Checksum(comm_buffer, len + 2);

	switch(iface)
	{
		case COMM_BT:
			UARTIO_Transmit(&huart1, comm_buffer, len + 3);
			break;
		case COMM_USB:
			CDC_Transmit_FS(comm_buffer, len + 3);
			break;
		default:
			return COMM_FAIL;
	}
	return COMM_OK;
}