Posted on February 16, 2017 at 23:07 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);
}
#rc522 #stm32
