【GD32L233C-START】9、硬件SPI1驱动RC522

1、关于GD32L233CCT6的SPI接口

可以看出 有两路spi，spi0和spi1，本节使用spi1。

2、开发板上SPI的引脚

3、spi1引脚复用

4、开发板与RC522模块连接

开发板 rc522 PB12 <----------------------------->SDA(NSS) PB13 <----------------------------->SCK PB14 <----------------------------->MISO PB15 <----------------------------->MOSI PB0 <----------------------------->RST 3.3V <----------------------------->3V3 GND <----------------------------->GND

5、与SPI相关操作代码

代码语言：javascript复制

void SpiIoInit(void)
{
	rcu_periph_clock_enable(RCU_GPIOB);
	
	gpio_mode_set(GPIOB, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN_0 );
    gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_0);
	
	/* SPI1 GPIO configuration: NSS/PB12 */
	gpio_mode_set(GPIOB, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN_12 );
    gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_12);
	
	/* SPI1 GPIO configuration: SCK/PB13, MISO/PB14, MOSI/PB15 */
    gpio_af_set(GPIOB, GPIO_AF_6, GPIO_PIN_13 | GPIO_PIN_14 | GPIO_PIN_15);
    gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_13 | GPIO_PIN_14 | GPIO_PIN_15);
    gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_13 | GPIO_PIN_14 | GPIO_PIN_15);
}

void SpiInit(void)
{
    spi_parameter_struct spi_init_struct;

	rcu_periph_clock_enable(RCU_SPI1);

    /* deinitilize SPI and the parameters */
    spi_i2s_deinit(SPI1);
    spi_struct_para_init(&spi_init_struct);

    /* SPI1 parameter configuration */
    spi_init_struct.trans_mode           = SPI_TRANSMODE_FULLDUPLEX;
    spi_init_struct.device_mode          = SPI_MASTER;
    spi_init_struct.frame_size           = SPI_FRAMESIZE_8BIT;
    spi_init_struct.clock_polarity_phase = SPI_CK_PL_LOW_PH_1EDGE;
    spi_init_struct.nss                  = SPI_NSS_SOFT;
    spi_init_struct.prescale             = SPI_PSC_8;
    spi_init_struct.endian               = SPI_ENDIAN_MSB;
    spi_init(SPI1, &spi_init_struct);
	
	spi_crc_polynomial_set(SPI1, 7);

	spi_enable(SPI1);
}


uint8_t  SPIWriteByte(uint8_t Byte)
{
	uint16_t ret=0;

	while(RESET == spi_i2s_flag_get(SPI1, SPI_FLAG_TBE)) {};   //等待发送区空	
    spi_i2s_data_transmit(SPI1, Byte);                         //发送一个byte  
	while(RESET == spi_i2s_flag_get(SPI1, SPI_FLAG_RBNE)) {};  //等待接收完一个byte
    ret=spi_i2s_data_receive(SPI1);                            //返回收到的数据
	
	return (ret&0x0ff);
}

6、与RC522操作相关代码

代码语言：javascript复制

void RC522Init(void)
{
	uint8_t ver=0;
	
	SpiIoInit();
	SpiInit();
	
	PcdReset();
	
	ver=ReadRawRC(VersionReg);
	
	if(ver==0x91||ver==0x92)
	{
		printf("rc522 existrn");
	}
	else
	{
		printf("rc522 not existrn");
	}
	
	PcdAntennaOff();
	DelayMs(2);  
	PcdAntennaOn();
	M500PcdConfigISOType( 'A' );
}

unsigned char CT[2];//卡类型
unsigned char SN[4]; //卡号

void RC522Polling(void)
{
	unsigned char status;	
	uint8_t j; 
	
	status = PcdRequest(PICC_REQALL,CT);/*尋卡*/
	if(status==MI_OK)//尋卡成功
	{
		status=MI_ERR;
		status = PcdAnticoll(SN);/*防冲撞*/
	}

	if(status==MI_OK)//防衝撞成功
	{
		status=MI_ERR;		
		
		printf("rnThe Card ID is:");
		for(j=0;j<4;j  )
		{
			printf("X",SN[j]);
		}
		printf("rn");
		status =PcdSelect(SN);
	}
}

7、实验现象

spi

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