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Stuck With STM32F0 SPI + RFID

Question asked by mattoo.anuj on Feb 16, 2017
Latest reply on Feb 18, 2017 by KIC8462852 EPIC204278916

I am trying to make RC522 (RFID) work on STM32F0 discovery board. I read the arduino library which can be useful, before starting I am trying to make SPI work.

I have connected all the pins to STM32F0 and CS pin is handled manually not by NSS pin of SPI.

I am trying to read the firmware of the RC522 module. According to the datasheet it should reply with either 0x91 or 0x92. I am not getting any of these but some strange values like 0x24 or 0xA4. I used STM32 CubeMx to generate the Basic code. Here is my SPI initialization code :-

 hspi1.Instance = SPI1;  
hspi1.Init.Mode = SPI_MODE_MASTER; 
hspi1.Init.Direction = SPI_DIRECTION_2LINES; 
hspi1.Init.DataSize = SPI_DATASIZE_8BIT; 
hspi1.Init.CLKPolarity = SPI_POLARITY_HIGH;  
hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;  
hspi1.Init.NSS = SPI_NSS_SOFT;  
hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16;  
hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;  
hspi1.Init.TIMode = SPI_TIMODE_DISABLE; 
hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE; 
hspi1.Init.CRCPolynomial = 7;  
hspi1.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE; 
hspi1.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;  
if (HAL_SPI_Init(&hspi1) != HAL_OK)  
{    
  Error_Handler();
}

Here is my simple code to read the firmware version :-

uint8_t address,value; 
address = (((0x37 << 1) & 0x7E) | 0x80); 

while (1)  
{    

  HAL_GPIO_WritePin(CS_GPIO_Port,CS_Pin,GPIO_PIN_RESET);     

  HAL_SPI_Transmit(&hspi1,&address,1,50);    
  HAL_SPI_Receive(&hspi1,&value,1,50);       
  HAL_SPI_Transmit(&hspi1,0x00,1,50);   // Stop Reading      

  HAL_GPIO_WritePin(CS_GPIO_Port,CS_Pin,GPIO_PIN_SET);     

  HAL_Delay(50);    
}

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