fm17550 nfc芯片的uart通讯
时间: 2023-08-06 11:09:14 浏览: 299
FPGA的UART通信
FM17550是一款NFC芯片,它支持UART通信协议。下面是一个简单的FM17550与MCU之间通过UART进行通信的例程:
1. 首先,需要配置MCU的串口通信的波特率、数据位、停止位、校验位等参数,以便与FM17550进行通信。
2. 在MCU中编写相应的代码,向FM17550发送命令或指令,并接收FM17550返回的数据。
3. 在发送数据之前,需要先将要发送的命令或指令按照FM17550的通信协议进行打包和编码。
4. 发送数据时,将编码后的数据通过串口发送到FM17550,等待FM17550返回数据。
5. 接收数据时,将从串口接收到的数据解码并解析,以获取FM17550返回的数据。
以下是一个基于STM32的FM17550与MCU之间通过UART进行通信的简单例程:
```c
#include "stm32f4xx.h"
#include "stdio.h"
#define FM17550_UART USART1
#define FM17550_UART_CLK RCC_APB2Periph_USART1
#define FM17550_UART_BAUDRATE 9600
#define FM17550_UART_WORDLENGTH USART_WordLength_8b
#define FM17550_UART_STOPBITS USART_StopBits_1
#define FM17550_UART_PARITY USART_Parity_No
#define FM17550_UART_HARDWARECTRL USART_HardwareFlowControl_None
void FM17550_UART_Init(void)
{
USART_InitTypeDef USART_InitStructure;
/* Enable the FM17550_UART clock */
RCC_APB2PeriphClockCmd(FM17550_UART_CLK, ENABLE);
/* FM17550_UART configuration */
USART_InitStructure.USART_BaudRate = FM17550_UART_BAUDRATE;
USART_InitStructure.USART_WordLength = FM17550_UART_WORDLENGTH;
USART_InitStructure.USART_StopBits = FM17550_UART_STOPBITS;
USART_InitStructure.USART_Parity = FM17550_UART_PARITY;
USART_InitStructure.USART_HardwareFlowControl = FM17550_UART_HARDWARECTRL;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
/* Configure the FM17550_UART */
USART_Init(FM17550_UART, &USART_InitStructure);
/* Enable the FM17550_UART Receive and Transmit interrupts */
USART_ITConfig(FM17550_UART, USART_IT_RXNE, ENABLE);
/* Enable the FM17550_UART */
USART_Cmd(FM17550_UART, ENABLE);
}
void FM17550_UART_SendByte(uint8_t byte)
{
while (USART_GetFlagStatus(FM17550_UART, USART_FLAG_TXE) == RESET);
USART_SendData(FM17550_UART, byte);
}
uint8_t FM17550_UART_ReceiveByte(void)
{
while (USART_GetFlagStatus(FM17550_UART, USART_FLAG_RXNE) == RESET);
return USART_ReceiveData(FM17550_UART);
}
void FM17550_UART_SendCmd(uint8_t cmd[], uint8_t len)
{
uint8_t i;
for(i = 0; i < len; i++)
{
FM17550_UART_SendByte(cmd[i]);
}
}
void FM17550_UART_ReceiveData(uint8_t buf[], uint8_t len)
{
uint8_t i;
for(i = 0; i < len; i++)
{
buf[i] = FM17550_UART_ReceiveByte();
}
}
int main(void)
{
uint8_t cmd[] = {0xAA, 0xBB, 0xCC, 0xDD};
uint8_t buf[10];
FM17550_UART_Init();
/* Send command to FM17550 */
FM17550_UART_SendCmd(cmd, sizeof(cmd));
/* Receive data from FM17550 */
FM17550_UART_ReceiveData(buf, sizeof(buf));
while(1)
{
/* Loop forever */
}
}
```
上述代码中,通过FM17550_UART_Init()函数初始化串口,通过FM17550_UART_SendCmd()函数发送命令,通过FM17550_UART_ReceiveData()函数接收数据。这只是一个简单的例程,具体实现要根据具体应用场景进行修改。
阅读全文