#include "sys.h"
#include "delay.h"
#include "usart.h"
#include "string.h"
#include "uart.h"
#include "led.h"


uint8_t recive_buff[256] = {0};
uint16_t recive_count = 0;
uint8_t sendbuf[256] = {0};

#define AC_DC         1
#define AC3           2

uint16_t flag = 0;

extern uint16_t recive_flag;







unsigned short calculateModbusCRC16(uint8_t *data,uint16_t lenth)
{
   
    uint16_t crc = 0xFFFF; // Initial value
	unsigned short swappedCRC = 0xFFFF;
	int i = 0;
	int j = 0;
    for (; i < lenth; i++)
    {
   
        crc = crc ^ data[i]; // XOR byte into the least significant byte of CRC
				j = 0;
        for (; j < 8; j++)
        {
   
            if (crc & 1)
            {
   
                crc >>= 1;
                crc ^= 0xA001;
            }
            else
            {
                crc >>= 1;
            }
        }
    }
    // Swap the bytes of the CRC to match Modbus convention
		 swappedCRC = ((crc >> 8) & 0xFF) | ((crc & 0xFF) << 8);
    return crc;
}

int check_ac_dc()
{
	int t = -1;
	uint16_t data = 0;
	recive_count = 0;
	memset(sendbuf,0,sizeof(sendbuf));
	sendbuf[0] = 0x01;
	sendbuf[1] = 0x03;
	sendbuf[2] = 0x0f;
	sendbuf[3] = 0xA0;
	sendbuf[4] = 0x00;
	sendbuf[5] = 0x20;
	data = calculateModbusCRC16(sendbuf,6);
	sendbuf[6] = data;
	sendbuf[7] = data >> 8;
	recive_count = (sendbuf[5]) * 2 +3+2;	
	uart3_send(&sendbuf[0],8);
	delay_ms(300);
	if(recive_flag)
	{
		flag = AC_DC;
		t = 0;
	}else
		flag = 0;
	return t;
}

int check_ac3()
{

	int t = -1;
#if 1
	uint16_t data = 0;
	recive_count = 0;
	memset(sendbuf,0,sizeof(sendbuf));
	sendbuf[0] = 0x01;
	sendbuf[1] = 0x03;
	sendbuf[2] = 0x17;
	sendbuf[3] = 0x70;
	sendbuf[4] = 0x00;
	sendbuf[5] = 0x20;
	data = calculateModbusCRC16(sendbuf,6);
	sendbuf[6] = data;
	sendbuf[7] = data >> 8;
	recive_count = (sendbuf[5]) * 2 + 2 + 4;	
	uart3_send(&sendbuf[0],8);
	delay_ms(300);
	if(recive_flag)
	{
		flag = AC3;
		t = 0;
	}else
		flag = 0;
#endif
	return t;
}




int main(void)
 {		

	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
	delay_init();	    	  
	uart_init(115200);
	led_init();
	uart3_init();
  while(1)
	{
		if(flag == 0)
		{
			if( -1 ==check_ac_dc())
				check_ac3();

		}else if(flag == 1)
		{
			check_ac_dc();

		}else if(flag == 2)
		{
			check_ac3();
		}
		if(flag)
		{
			led_flash();
			led_status();			
		}else
		{
			led_clear();
		}

		delay_ms(500);
	}	 
}