stm32f030c8 not communicating with rc522 rfid reader.🤦�?♀�?

[shikha]

here's my initialization code for spi and rc522:

/* USER CODE BEGIN SPI1_Init 1 */

 LL_SPI_SetRxFIFOThreshold(SPI1,LL_SPI_RX_FIFO_TH_QUARTER);

 /* USER CODE END SPI1_Init 1 */

 /* SPI1 parameter configuration*/

 SPI_InitStruct.TransferDirection = LL_SPI_FULL_DUPLEX;

 SPI_InitStruct.Mode = LL_SPI_MODE_MASTER;

 SPI_InitStruct.DataWidth = LL_SPI_DATAWIDTH_8BIT;

 SPI_InitStruct.ClockPolarity = LL_SPI_POLARITY_LOW;

 SPI_InitStruct.ClockPhase = LL_SPI_PHASE_1EDGE;

 SPI_InitStruct.NSS = LL_SPI_NSS_SOFT;

 SPI_InitStruct.BaudRate = LL_SPI_BAUDRATEPRESCALER_DIV32;

 SPI_InitStruct.BitOrder = LL_SPI_MSB_FIRST;

 SPI_InitStruct.CRCCalculation = LL_SPI_CRCCALCULATION_DISABLE;

 SPI_InitStruct.CRCPoly = 7;

 LL_SPI_Init(SPI1, &SPI_InitStruct);

 LL_SPI_SetStandard(SPI1, LL_SPI_PROTOCOL_MOTOROLA);

 LL_SPI_DisableNSSPulseMgt(SPI1);

 /* USER CODE BEGIN SPI1_Init 2 */

 LL_SPI_Enable(SPI1);

void PcdInit(void)

{

GPIOB->BSRR = CS_MASK; //ChipSelect=1; added

PcdReset();

WriteRawRC(ModeReg, 0x3D); //Set the preset value for the CRC coprocessor for the CalcCRC command to 0x6363 (ISO 14443-3 part 6.2.4)

WriteRawRC(TModeReg, 0x80); // TAuto=1; timer starts automatically at the end of the transmission in all communication modes at all speeds

WriteRawRC(TPrescalerReg, 0xA9); // TPreScaler = TModeReg[3..0]:TPrescalerReg, ie 0x0A9 = 169 => f_timer=40kHz, ie a timer period of 25µs.

WriteRawRC(TReloadRegH, 0x03); // Reload timer with 0x3E8 = 1000, ie 25ms before timeout.

WriteRawRC(TReloadRegL, 0xE8);

WriteRawRC(TxASKReg, 0x40); //Force a 100 % ASK modulation independent of the ModGsPReg register setting

WriteRawRC(RFCfgReg, 0x7F); //RxGain = 48dB

ClearBitMask(Status2Reg,0x08); //MIFARE Crypto1=0

PcdAntennaOff();

PcdAntennaOn();

delay_ms(100);

//DELAY_80US;

//DELAY_80US;

}

void PcdReset(void)

{

GPIOB->BSRR = RST_MASK;//Reset=1

DELAY_80US; // change from 10US to 80US Pavan 13-Feb-19

GPIOB->BRR = RST_MASK;//Reset=0

DELAY_80US; // change from 10US to 80US Pavan 13-Feb-19

DELAY_80US;

//DELAY_80US

DELAY_80US; // change from 10US to 80US Pavan 13-Feb-19

GPIOB->BSRR = RST_MASK;//Reset=1

DELAY_80US;

WriteRawRC(CommandReg,PCD_RESETPHASE); //Soft Reset

WriteRawRC(CommandReg,PCD_RESETPHASE);

DELAY_80US;

}

rc522 read and write functions are:

void WriteRawRC(unsigned char Address, unsigned char value)

{

GPIOB->BRR = CS_MASK;//ChipSelect=0;

(void)SPI1_SendReceive((Address<<1)&0x7E); //Send byte through SPI

(void) SPI1_SendReceive(value); //Send byte through SPI

GPIOB->BSRR = CS_MASK; //ChipSelect=1;

}

unsigned char ReadRawRC(unsigned char Address)

{

unsigned char ucResult;

GPIOB->BRR = CS_MASK;//ChipSelect=0;

(void)SPI1_SendReceive(((Address<<1)&0x7E) | 0x80); //Send byte through SPI

ucResult = SPI1_SendReceive(0x00);//Read byte through SPI

GPIOB->BSRR = CS_MASK; //ChipSelect=1;

return ucResult;

}

uint8_t SPI1_SendReceive(uint8_t byData)

{

while(!(SPI1->SR & SPI_SR_TXE));

LL_SPI_TransmitData8(SPI1, byData);

   while(!(SPI1->SR & SPI_SR_RXNE));

   byData = LL_SPI_ReceiveData8(SPI1);

return byData;

}

after degugging i came to know that spi after few instructions read 00 from rc522 registers in pcdrequest function.:| few days ago it was working on the same code and now again i stuck on the same problem.

please help, :downcast_face_with_sweat: is there any hardware issue or my farmware is not correct?

thanks in advance.........