使用stm32驱动pn532读取IC卡

好的，下面是将PN532与STM32连接并读取IC卡的基本步骤：

1. 确认PN532设备与STM32设备正常连接，可以使用SPI或者UART通信协议连接，这里以SPI为例。

2. 在STM32中初始化SPI接口，配置SPI的参数，如时钟分频、数据位数等。

3. 根据PN532的通信协议，发送初始化命令以及读取IC卡的命令。

4. 处理PN532返回的数据，获取IC卡的信息。

下面是一个简单的示例代码，可以帮助您开始：

#include "stm32f4xx.h"
#include "spi.h"
#include "delay.h"

#define PN532_SPI_CS_PORT    GPIOB
#define PN532_SPI_CS_PIN     GPIO_Pin_12

void PN532_SPI_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    SPI_InitTypeDef SPI_InitStructure;
    
    /* Enable SPI clock and GPIO clock */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB, ENABLE);
    
    /* Configure SPI pins */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7; 
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;  
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOA, &GPIO_InitStructure); 
    
    /* Configure CS pin */
    GPIO_InitStructure.GPIO_Pin = PN532_SPI_CS_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_Init(PN532_SPI_CS_PORT, &GPIO_InitStructure);
    
    /* Connect SPI pins to SPI alternate function */
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_SPI1);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_SPI1);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_SPI1);
    
    /* Configure SPI */
    SPI_I2S_DeInit(SPI1);
    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init(SPI1, &SPI_InitStructure);
    
    /* Enable SPI */
    SPI_Cmd(SPI1, ENABLE);
    
    /* Set CS pin high */
    GPIO_SetBits(PN532_SPI_CS_PORT, PN532_SPI_CS_PIN);
}

void PN532_SPI_Write(uint8_t* data, uint16_t len)
{
    /* Set CS pin low */
    GPIO_ResetBits(PN532_SPI_CS_PORT, PN532_SPI_CS_PIN);
    
    /* Send data */
    for (uint16_t i = 0; i < len; i++) {
        SPI_I2S_SendData(SPI1, data[i]);
        while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
        while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
        while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
    }
    
    /* Set CS pin high */
    GPIO_SetBits(PN532_SPI_CS_PORT, PN532_SPI_CS_PIN);
}

void PN532_SPI_Read(uint8_t* data, uint16_t len)
{
    /* Set CS pin low */
    GPIO_ResetBits(PN532_SPI_CS_PORT, PN532_SPI_CS_PIN);
    
    /* Receive data */
    for (uint16_t i = 0; i < len; i++) {
        SPI_I2S_SendData(SPI1, 0xFF);
        while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
        while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
        while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
        data[i] = SPI_I2S_ReceiveData(SPI1);
    }
    
    /* Set CS pin high */
    GPIO_SetBits(PN532_SPI_CS_PORT, PN532_SPI_CS_PIN);
}

void PN532_Reset(void)
{
    uint8_t cmd[] = {0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00};
    PN532_SPI_Write(cmd, sizeof(cmd));
    delay_ms(10);
}

void PN532_SAMConfig(void)
{
    uint8_t cmd[] = {0x14, 0x01, 0x00, 0x00, 0x00};
    PN532_SPI_Write(cmd, sizeof(cmd));
    uint8_t response[] = {0, 0, 0, 0, 0, 0, 0};
    PN532_SPI_Read(response, sizeof(response));
    delay_ms(10);
}

uint8_t PN532_InListPassiveTarget(void)
{
    uint8_t cmd[] = {0x4A, 0x01, 0x00};
    PN532_SPI_Write(cmd, sizeof(cmd));
    uint8_t response[] = {0, 0, 0, 0, 0, 0, 0};
    PN532_SPI_Read(response, sizeof(response));
    if (response[0] == 0x01 && response[1] == 0x01 && response[2] == 0x00) {
        return response[4];
    } else {
        return 0;
    }
}

int main(void)
{
    PN532_SPI_Init();
    PN532_Reset();
    PN532_SAMConfig();
    while (1) {
        uint8_t target = PN532_InListPassiveTarget();
        if (target) {
            /* IC卡已经检测到 */
            // 处理IC卡信息
        }
    }
}

在此示例中，我们使用SPI1作为SPI接口，并将SCK、MISO、MOSI分别连接到PA5、PA6、PA7。CS引脚连接到PB12。您需要根据您的硬件连接来更改这些引脚。

在main函数中，我们首先初始化PN532设备，然后发送PN532的复位命令，并进行SAM配置。然后，在一个循环中，我们一直检测是否检测到IC卡，如果检测到，则处理IC卡信息。

请注意，此示例代码仅用于参考。您需要根据您的具体要求进行修改和调整。