STM32 USB通讯代码
时间: 2023-12-20 17:56:33 浏览: 24
以下是一个使用STM32CubeMX和HAL库实现USB CDC通讯的示例代码:
```c
#include "main.h"
#include "usbd_cdc_if.h"
USBD_HandleTypeDef hUsbDeviceFS;
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USB_DEVICE_Init(void);
int main(void)
{
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_USB_DEVICE_Init();
while (1)
{
// 读取串口数据并处理
if(CDC_Receive_FS(data, &len) == USBD_OK)
{
// 处理数据
}
}
}
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
if (GPIO_Pin == GPIO_PIN_0)
{
// 发送数据到串口
CDC_Transmit_FS(data, len);
}
}
void Error_Handler(void)
{
}
static void MX_USB_DEVICE_Init(void)
{
hUsbDeviceFS.dev_state = USBD_STATE_DEFAULT;
hUsbDeviceFS.id = USBD_FS;
hUsbDeviceFS.pData = NULL;
hUsbDeviceFS.pClassData = NULL;
hUsbDeviceFS.pClass = &USBD_CDC;
hUsbDeviceFS.pDesc = NULL;
hUsbDeviceFS.bSpeed = USBD_SPEED_FULL;
hUsbDeviceFS.bDevAddr = 0;
hUsbDeviceFS.bNumInterfaces = 1;
hUsbDeviceFS.pConfDesc = NULL;
hUsbDeviceFS.bMaxPacketSize = 64;
hUsbDeviceFS.pStringSerial = NULL;
hUsbDeviceFS.vbus_sensing_enable = 0;
hUsbDeviceFS.dma_enable = 0;
hUsbDeviceFS.low_power_enable = 0;
hUsbDeviceFS.lpm_state = USBD_LPM_DISABLE;
hUsbDeviceFS.bcdDevice = 0x0200;
USBD_Init(&hUsbDeviceFS, &FS_Desc, DEVICE_FS);
USBD_RegisterClass(&hUsbDeviceFS, &USBD_CDC);
USBD_CDC_RegisterInterface(&hUsbDeviceFS, &USBD_Interface_fops_FS);
USBD_Start(&hUsbDeviceFS);
}
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
__HAL_RCC_GPIOA_CLK_ENABLE();
GPIO_InitStruct.Pin = GPIO_PIN_0;
GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
HAL_NVIC_SetPriority(EXTI0_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(EXTI0_IRQn);
}
void EXTI0_IRQHandler(void)
{
HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_0);
}
```
需要注意的是,以上代码只是一个简单的示例,实际应用中还需要根据具体需求进行相应的修改和完善。另外,需要在CubeMX中配置USB CDC功能,生成对应的代码并添加到工程中。