[已解决]请教一下STM32 H7的ha库关于阻塞收发SPI的问题

发布于 2022-12-13 11:35:55 浏览：1038 订阅该版

[tocm]

### 环境
- ART-PI STM32H750
- 编译器 KEIL AC6 -0Z
### 问题产生原因
- HAL库版本从V1.10更新至V1.11后,SPI FLASH报错

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20221213/d0d7a797ae5da02bd44f193e239bcc92.png)

- 排查发现问题代码在HAL_SPI_TransmitReceive函数中关于 8 Bit mode的检测接收标志上
- SPI.C的代码已经换成V1.11版本,仅出问题地方修改为V1.10的判断
V1.10版本HAL库的代码

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20221213/519bfc8773e0cb9627dd2b26f6b6d5af.png)

- 差别在这里
```c
      /* Wait until RXWNE/FRLVL flag is reset */
      if (((hspi->Instance->SR & (SPI_FLAG_RXWNE | SPI_FLAG_FRLVL)) != 0UL) && (initial_RxXferCount > 0UL))
      {
//      /* Check the RXP flag */
//      if ((__HAL_SPI_GET_FLAG(hspi, SPI_FLAG_RXP)) && (initial_RxXferCount > 0UL))
//      {
        *((uint8_t *)hspi->pRxBuffPtr) = *((__IO uint8_t *)&hspi->Instance->RXDR);
        hspi->pRxBuffPtr += sizeof(uint8_t);
        hspi->RxXferCount--;
        initial_RxXferCount = hspi->RxXferCount;
      }
```

V1.11版本HAL库的代码

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20221213/1144ee684f3f4bdf98cbb7fccc0c6f17.png)

- 差别在这里
```c
//      /* Wait until RXWNE/FRLVL flag is reset */
//      if (((hspi->Instance->SR & (SPI_FLAG_RXWNE | SPI_FLAG_FRLVL)) != 0UL) && (initial_RxXferCount > 0UL))
//      {
      /* Check the RXP flag */
      if ((__HAL_SPI_GET_FLAG(hspi, SPI_FLAG_RXP)) && (initial_RxXferCount > 0UL))
      {
        *((uint8_t *)hspi->pRxBuffPtr) = *((__IO uint8_t *)&hspi->Instance->RXDR);
        hspi->pRxBuffPtr += sizeof(uint8_t);
        hspi->RxXferCount--;
        initial_RxXferCount = hspi->RxXferCount;
      }
```

- 主要差别就在与对接收标志的判断
V1.10判断SPI_FLAG_RXWNE | SPI_FLAG_FRLVL
V1.11判断SPI_FLAG_RXP
实际DEBUG进入发现,只触发了FRLVL标志,并没有触发RXP标志

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20221213/1f896d5d2fe246bcfcdd366b8cd33c24.png)

- 标志位介绍

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20221213/3736405b017b5f1d2bcbda0c505927ca.png.webp)

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20221213/553024bf65150761613f054e79946029.png)
### 具体报错原因

- sufd读取JEDEC ID 时出错

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20221213/b74f26d0307a540a828c2a7807e346fa.png)
- 读取3字节ID

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20221213/89e023380c9675635ca4899d30f3e6a5.png)

- spixfer中阻塞接收超时
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20221213/cada760993f29c062b6b932a8687bcf6.png)

### 讨论一下
- HAL库SPI在阻塞接收8bit模式下判断RXP是否合理?还是因为按照旧代码判断 RXWNE/FRLVL flag

- 我在手册中看到如下段落
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20221216/81a958e2392c77e1c9178cddc9af4057.png.webp)