写一段代码使用STM32F103C8T6开发PN532
时间: 2024-01-09 09:04:04 浏览: 42
要使用STM32F103C8T6开发PN532,首先需要连接PN532模块到STM32F103C8T6上,并使用SPI通信协议进行通信。以下是一个简单的代码示例:
```
#include "stm32f10x.h"
// 定义PN532的地址
#define PN532_CS_PIN GPIO_Pin_4
#define PN532_CS_PORT GPIOA
#define PN532_IRQ_PIN GPIO_Pin_5
#define PN532_IRQ_PORT GPIOA
// 定义SPI接口的参数
#define SPIx SPI1
#define SPIx_CLK RCC_APB2Periph_SPI1
#define SPIx_GPIO GPIOA
#define SPIx_GPIO_CLK RCC_APB2Periph_GPIOA
#define SPIx_SCK_PIN GPIO_Pin_5
#define SPIx_MISO_PIN GPIO_Pin_6
#define SPIx_MOSI_PIN GPIO_Pin_7
// 初始化SPI接口
void SPIx_Init(void)
{
SPI_InitTypeDef SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(SPIx_GPIO_CLK | SPIx_CLK, ENABLE);
GPIO_InitStructure.GPIO_Pin = SPIx_SCK_PIN | SPIx_MISO_PIN | SPIx_MOSI_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(SPIx_GPIO, &GPIO_InitStructure);
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_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPIx, &SPI_InitStructure);
SPI_Cmd(SPIx, ENABLE);
}
// 初始化PN532模块
void PN532_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = PN532_CS_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(PN532_CS_PORT, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = PN532_IRQ_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(PN532_IRQ_PORT, &GPIO_InitStructure);
GPIO_SetBits(PN532_CS_PORT, PN532_CS_PIN);
}
// 读取PN532的状态
uint8_t PN532_ReadStatus(void)
{
uint8_t status;
GPIO_ResetBits(PN532_CS_PORT, PN532_CS_PIN);
SPI_I2S_SendData(SPIx, 0x02);
while (SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_TXE) == RESET);
while (SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_RXNE) == RESET);
status = SPI_I2S_ReceiveData(SPIx);
GPIO_SetBits(PN532_CS_PORT, PN532_CS_PIN);
return status;
}
// 主函数
int main(void)
{
SPIx_Init();
PN532_Init();
while (1)
{
// 读取PN532的状态
uint8_t status = PN532_ReadStatus();
// 处理状态
switch (status)
{
case 0x00:
// 成功读取
break;
case 0x01:
// 数据读取失败
break;
case 0x02:
// PN532忙,等待
break;
default:
// 其他错误
break;
}
}
}
```
以上代码仅为示例代码,具体的PN532模块驱动还需要根据实际情况进行修改和完善。