bms/Application/app/protocol.c

#include "protocol.h"
#include <string.h>
#include "bsp/uart.h"
#include "pc_message.h"
#include "bms_message.h"
static uint16_t _check_sum(uint8_t*data,uint16_t size);
static uart_enum_t current_uart = SHARK_UART0;

void protocol_send_bms_info(uint8_t dest, uint8_t key, uint8_t *data, int len){
	can_frame_t can_frame;
	CAN_OUT(&(can_frame.head), dest);
	can_frame.key = key;
	shark_uart_frame_start(current_uart, (uint8_t *)&can_frame, sizeof(can_frame));
	shark_uart_frame_continue(current_uart, data, len);
	shark_uart_frame_end(current_uart);	
}

void protocol_send_ack(uint8_t dest, uint8_t key, int result) {
	uint8_t data[sizeof(can_frame_t) + 1];
	can_frame_t *frame = (can_frame_t *)data;
	CAN_OUT(&(frame->head), dest);
	frame->key = key;
	data[sizeof(can_frame_t)] = result;
	shark_uart_write_frame(current_uart, data, sizeof(data));
}

void protocol_send_debug_info(uint8_t dest, uint8_t *data, int len){	
	can_head_t can_head;
	CAN_OUT(&can_head, dest);
	shark_uart_frame_start(current_uart, (uint8_t *)&can_head, sizeof(can_head));
	shark_uart_frame_continue(current_uart, data, len);
	shark_uart_frame_end(current_uart);
}

/*如果接收到的数据frame，无法识别为新的protocol，认为是老协议，这里通过老协议发送给PSxxx,告知
  只支持新协议
*/
void protocol_notify_old_frame(uart_enum_t uart_no){
	current_uart = uart_no;
	protocol_old_head_t head;
	memset(&head, 0, sizeof(head));
	head.size = sizeof(head);
	head.protocol = 'C';
	head.type = 0x30;
	head.dir = 0x16;
	head.cmd = 0x10;
	head.bStatus = 1;
	head.checksum = _check_sum((uint8_t *)&head, head.size);
	shark_uart_write_bytes(current_uart, (uint8_t *)&head, head.size);
}

void protocol_recv_frame(uart_enum_t uart_no, uint8_t *data, int len){
	current_uart = uart_no;
	if (len < sizeof(can_frame_t)){
		return;
	}
	can_frame_t *can_frame = (can_frame_t *)data;
	if (!CAN_IN(&(can_frame->head))) {//data is sent by myself, drop
		return;
	}

	len -= sizeof(can_frame_t);
	if (can_frame->head.can_addr == 0x45){ //pc sent
		process_pc_message(can_frame, len);
	}else {
		process_bms_message(can_frame, len);
	}
}

static uint16_t _check_sum(uint8_t*data,uint16_t size)
{
	uint32_t checksum;
	if((NULL == data)||(0 == size)){
		return 0;
	}
	checksum = 0;
	while(size>1) {
		checksum += *(uint16_t*)data;
		data += 2;
		size -= 2;
	}
	if(size>0) {
		checksum += *data;
	}

	while(checksum>>16) {
		checksum = (checksum&0xFFFF)+(checksum>>16);
	}
	return (uint16_t)~checksum;
}