一个IO-Link通信收发器设备IC，用STM32标准库驱动L6362的示例

以下是一个使用STM32标准库驱动L6362的IO-Link通信收发器设备IC的示例代码：

#include "stm32f4xx.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_usart.h"

#define IO_LINK_TX_PIN GPIO_Pin_9
#define IO_LINK_RX_PIN GPIO_Pin_10
#define IO_LINK_GPIO GPIOA
#define IO_LINK_USART USART1

void IO_Link_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  USART_InitTypeDef USART_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;
  
  // Enable clock for GPIOA and USART1
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

  // Configure IO-Link TX pin (PA9) as alternate function push-pull
  GPIO_InitStructure.GPIO_Pin = IO_LINK_TX_PIN;
  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_UP ;
  GPIO_Init(IO_LINK_GPIO, &GPIO_InitStructure);

  // Configure IO-Link RX pin (PA10) as input floating
  GPIO_InitStructure.GPIO_Pin = IO_LINK_RX_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
  GPIO_Init(IO_LINK_GPIO, &GPIO_InitStructure);

  // Connect PA9 to USART1_Tx
  GPIO_PinAFConfig(IO_LINK_GPIO, GPIO_PinSource9, GPIO_AF_USART1);

  // Connect PA10 to USART1_Rx
  GPIO_PinAFConfig(IO_LINK_GPIO, GPIO_PinSource10, GPIO_AF_USART1);

  // Configure USART1
  USART_InitStructure.USART_BaudRate = 230400;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  USART_Init(IO_LINK_USART, &USART_InitStructure);

  // Enable USART1 receive interrupt
  USART_ITConfig(IO_LINK_USART, USART_IT_RXNE, ENABLE);

  // Configure NVIC
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  // Enable USART1
  USART_Cmd(IO_LINK_USART, ENABLE);
}

void USART1_IRQHandler(void)
{
  // Handle USART1 receive interrupt
  if (USART_GetITStatus(IO_LINK_USART, USART_IT_RXNE) != RESET)
  {
    // Read data from USART1 receive buffer
    uint16_t data = USART_ReceiveData(IO_LINK_USART);

    // Process received data
    // ...

    // Clear USART1 receive interrupt flag
    USART_ClearITPendingBit(IO_LINK_USART, USART_IT_RXNE);
  }
}

void IO_Link_Transmit(uint8_t *data, uint16_t length)
{
  // Wait for USART1 transmit buffer to be empty
  while (USART_GetFlagStatus(IO_LINK_USART, USART_FLAG_TXE) == RESET);

  // Send start bit
  USART_SendData(IO_LINK_USART, 0x00);

  // Send data bytes
  for (uint16_t i = 0; i < length; i++)
  {
    // Wait for USART1 transmit buffer to be empty
    while (USART_GetFlagStatus(IO_LINK_USART, USART_FLAG_TXE) == RESET);

    // Send data byte
    USART_SendData(IO_LINK_USART, data[i]);
  }

  // Wait for USART1 transmit buffer to be empty
  while (USART_GetFlagStatus(IO_LINK_USART, USART_FLAG_TXE) == RESET);

  // Send stop bit
  USART_SendData(IO_LINK_USART, 0xFF);
}

在这个示例中，我们使用了STM32的USART1串口来与L6362进行通信。我们将PA9和PA10引脚分别用作USART1的Tx和Rx引脚，并且使用了230400波特率进行通信。在初始化IO-Link设备之后，我们开启了USART1的接收中断，并且在USART1_IRQHandler函数中处理了接收到的数据。在IO_Link_Transmit函数中，我们使用了帧格式化方法发送数据给IO-Link设备。

请注意，本示例代码仅供参考，实际应用中的具体实现方式可能会因为硬件和软件环境的不同而有所不同。