PingPong/Core/Src/IR.c

#include "IR.h"
#include "usbd_cdc_if.h"
#include "Print.h"

unsigned char IR_Command;
unsigned char IR_Address;
unsigned char IR_OptionsProgram;
unsigned char IR_IndexBitCommand;
unsigned char IR_IndexBitAddress;

unsigned int IR_Pulse;
unsigned int currentIR_Pulse;

unsigned char IRStatus;

void IR_handler() // SONY (SIRC) protocol 12 bit (7+5)
{

    if ((GPIOB->IDR & 0x0002) == 0)
    {
        IR_Pulse = SysTick->VAL;
        //			GPIOC->ODR ^= GPIO_PIN_13;
    }
    else
    {
        {
            currentIR_Pulse = SysTick->VAL;

            if (currentIR_Pulse > IR_Pulse)
            {
                currentIR_Pulse = IR_Pulse + 479999 - currentIR_Pulse;
            }
            else
            {
                currentIR_Pulse = IR_Pulse - currentIR_Pulse;
            }

            //	if (currentIR_Pulse > 150000 ) currentIR_Pulse = 0xFFFFFFFF - currentIR_Pulse;

            switch (IRStatus)
            {
            case STATUS_START:
            {
                if ((currentIR_Pulse < 130000) && (currentIR_Pulse > 110000)) // 2,7 ms - 2,3 ms
                {
                    IRStatus = STATUS_COMMAND; // 129600 - 110400
                    // print("STATUS_COMMAND\n");
                }
                else
                {
                    IRStatus = STATUS_ERROR;
                }
            }
            break;

            case STATUS_COMMAND:
            {

                if (currentIR_Pulse < 37440) // 0.78 ms   37440
                {
                    IR_Command &= ~((1 << IR_IndexBitCommand) & 0xFF);
                    // print("0");
                }
                else
                {
                    IR_Command |= ((1 << IR_IndexBitCommand) & 0xFF);
                    // print("1");
                }

                IR_IndexBitCommand++;
                if (IR_IndexBitCommand == 7)
                {
                    IRStatus = STATUS_ADDRESS;
                    // print("  STATUS_ADDRESS ");
                }
                else
                {
                    IRStatus = STATUS_COMMAND;
                }
            }
            break;

            case STATUS_ADDRESS:
            {

                {
                    if (currentIR_Pulse < 37440) // 0.78 <20><>
                    {
                        IR_Address &= ~((1 << IR_IndexBitAddress) & 0xFF);
                        // print("0");
                    }
                    else
                    {
                        IR_Address |= ((1 << IR_IndexBitAddress) & 0xFF);
                        // print("1");
                    }

                    IR_IndexBitAddress++;
                    if (IR_IndexBitAddress == 5)
                    {
//                    	printNumber(IR_Command);
                        IRStatus = STATUS_REPEAT;
                        // print("\n\n\n");
                    }
                    else
                    {
                        IRStatus = STATUS_ADDRESS;
                    }
                }
            }
            break;
            case STATUS_REPEAT:
                break;

            case STATUS_ERROR:
                // print("STATUS_ERROR\n\n");
            default:
                ClearIRStatus();

                break;
            }
        }
    }
}

void ClearIRStatus()
{
    IR_IndexBitCommand = 0x00;
    IR_IndexBitAddress = 0x00;
    IRStatus = STATUS_START;
}

IRData getIRData(){
	NVIC_DisableIRQ(EXTI1_IRQn);
	IRData ret = {IR_Address, IR_Command};
	NVIC_EnableIRQ(EXTI1_IRQn);
	return ret;
}

unsigned char IR_Available(){
	return IRStatus == STATUS_REPEAT;
}