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### 解决fatfs msc 冲突
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sd_diskio.c增加两个函数, msc usb中断时关闭消息
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```C
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void SD_Delet_Queue(void) {
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osMessageDelete(SDQueueID);
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}
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void SD_Create_Queue(void) {
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SDQueueID = osMessageQueueNew(QUEUE_SIZE, 2, NULL);
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}
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```
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启用或禁用 SD FatFS 0禁止
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```C
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static void Set_SD_WriteOrRead(uint8_t en) {
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if (en == 1) {
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SD_Create_Queue();
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SDCard_EN = 1;
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} else {
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SD_Delet_Queue();
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SDCard_EN = 0;
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}
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}
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```
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USB回调
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```C
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void OTG_FS_IRQHandler(void)
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{
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HAL_PCD_IRQHandler(&hpcd_USB_OTG_FS);
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FILE_MGT_USB_CHECK(); // 自定义的函数
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}
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```
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两个任务，一个是FatFs 读写任务，一个是 USB 状态连接任务
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FatFS 读写放到任务里面取， 等待信号量执行读写
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两个任务互斥信号量 osMutexWait(sdFreeMutexHandle, osWaitForever);
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```C
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static void FILE_MGT_SD_TEST_TASK(const void *arg) {
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osDelay(500);
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for (;;) {
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osDelay(500);
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osMutexWait(sdFreeMutexHandle, osWaitForever);
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if (SDCard_EN) {
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FatFs_FileTest();
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} else {
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printf("禁止使用SD卡\n");
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}
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osMutexRelease(sdFreeMutexHandle);
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}
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}
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```
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USB 状态连接检测任务， 检测到USB 关闭 SD FATFS
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需要提供 信号量 usbStateQueueHandle
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```C
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static void FILE_MGT_USB_CHECK_TASK(const void *arg) {
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uint8_t dev_state = 0;
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osEvent event;
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FatFs_Check();
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for (;;) {
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event = osMessageGet(usbStateQueueHandle, osWaitForever); // 改osMessageQueueGet
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if (event.status == osEventMessage) {
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osMutexWait(sdFreeMutexHandle, osWaitForever);
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printf("hUsbDeviceFS:%d\n", (uint8_t) event.value.v);
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if ((uint8_t) event.value.v == USBD_STATE_ADDRESSED) {
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dev_state = USBD_STATE_ADDRESSED;
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} else if ((dev_state == USBD_STATE_ADDRESSED)
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&& ((uint8_t) event.value.v == USBD_STATE_CONFIGURED)) {
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Set_SD_WriteOrRead(0);
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printf("usb connect\n");
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} else {
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dev_state = 0;
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Set_SD_WriteOrRead(1);
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printf("usb disconnect\n");
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}
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osMutexRelease(sdFreeMutexHandle);
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}
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}
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}
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```
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