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ie8及以上

【STM32H7S78-DK评测】+ 1、LTDC驱动LCD屏

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lugl 发布时间：2024-8-5 18:55

【目的】

使用stm32cubeMAX创建基于MDK工程，驱动LCD屏。

【步骤】

1、打开stm32cubeMAX，创建一个基于STM32H7S7L8H的基础工程。

2、添加App的LTDC，Display Type选择RG888，配置参数如下：

1）水平与垂直参数，我这里直接使用了官方demo的参数。

image.png

2）这里我只使用了1个图层，它的配置参数如下：

这里我也是借用了官方示例的一个图像来做演示，创建一个480*272大小的图像，放置于0，100的地方。

image.png

3）GPIO的设置，开启LTDC后，会默认给出GPIO的基本配置。经查看原理图中的LCD

image.png

再添加PA6为LTDC_B7，同时设置PE15为普通的输出模式，PG15为背光控制。

image.png

配置好后，生成MDK工程。

使用MDK打开新建的工程。需要添加用户代码才能成功驱动。

1、添加MPU配置代码，在stm32cubeMAX中，配置是禁用了MPU的配置的，所以在main中先行MPU配置。

MPU配置，首先要选择MDK的sct分散加载文件，在MPU配置中，是从该文件进行读取并配置的。在mdk的link中选择已存在的.\stm32h7rsxx_RAMxspi1_ROMxspi2.sct这个加载文件。

image.png

其文件内容如下：

; *************************************************************
; *** Scatter-Loading Description File generated by uVision ***
; *************************************************************

LOAD_FLASH 0x70000000 0x08000000  {    ; load region size_region
  ER_ROM 0x70000000 0x08000000  {  ; load address = execution address
   *.o (RESET, +First)
   *(InRoot$$Sections)
   .ANY (+RO)
   .ANY (+XO)
  }

  ER_ITCM 0x00000000 0x00010000  {  ;
  }

  RW_DTCM 0x20000000 0x00010000  {  ; RW data
   *(STACK)
   *(HEAP)
  }

  RW_SRAMAHB 0x30000000 0x8000  {
  }

  RW_BKPSRAM 0x38800000 0x1000  {
  }

  RW_EXTRAM 0x90000000 0x2000000  {
  }

  RW_RAM 0x24000000  0x00072000-0x400  {
   .ANY (+RW +ZI)
  }

  RW_NONCACHEABLEBUFFER  0x24072000-0x400 0x400 {
   *(noncacheable_buffer)
  }
}

此文件把代码放到了外置的flash上面执行。

MPU的配置，这个函数我也是直接抄了示例中的代码。他的主要思路就是读取sct文件中的配置，然后对其进行配置：

/**
  * @brief  This function configures the MPU context of the application.
  * @retval None
  */
void MPU_Config(void)
{
  MPU_Region_InitTypeDef MPU_InitStruct = {0};
  uint32_t index = MPU_REGION_NUMBER0;
  uint32_t address;
  uint32_t size;

  /* Disable the MPU */
  HAL_MPU_Disable();

  /* Initialize the background region */
  MPU_InitStruct.Enable = MPU_REGION_ENABLE;
  MPU_InitStruct.Number = index;
  MPU_InitStruct.BaseAddress = 0x0;
  MPU_InitStruct.Size = MPU_REGION_SIZE_4GB;
  MPU_InitStruct.SubRegionDisable = 0x87;
  MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
  MPU_InitStruct.AccessPermission = MPU_REGION_NO_ACCESS;
  MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;
  MPU_InitStruct.IsShareable = MPU_ACCESS_SHAREABLE;
  MPU_InitStruct.IsCacheable = MPU_ACCESS_CACHEABLE;
  MPU_InitStruct.IsBufferable = MPU_ACCESS_BUFFERABLE;
  HAL_MPU_ConfigRegion(&MPU_InitStruct);
  index++;

  /* Initialize the region corresponding to external RAM */
#if defined ( __ICCARM__ )
  extern uint32_t __region_EXTRAM_start__;
  extern uint32_t __region_EXTRAM_end__;

  address = (uint32_t)&__region_EXTRAM_start__;
  size = (uint32_t)&__region_EXTRAM_end__ - (uint32_t)&__region_EXTRAM_start__ + 1;

#elif defined (__CC_ARM) || defined(__ARMCC_VERSION)
  extern uint32_t Image$$RW_EXTRAM$$Base;
  extern uint32_t Image$$RW_EXTRAM$$ZI$$Length;
  extern uint32_t Image$$RW_EXTRAM$$Length;

  address = (uint32_t)&Image$$RW_EXTRAM$$Base;
  size  = (uint32_t)&Image$$RW_EXTRAM$$Length + (uint32_t)&Image$$RW_EXTRAM$$ZI$$Length;
#elif defined ( __GNUC__ )
  extern uint32_t __EXTRAM_BEGIN;
  extern uint32_t __EXTRAM_SIZE;
  address = (uint32_t)&__EXTRAM_BEGIN;
  size  = (uint32_t)&__EXTRAM_SIZE;
#else
#error "Compiler toolchain is unsupported"
#endif

  if (size != 0)
  {
    MPU_InitStruct.Enable = MPU_REGION_ENABLE;
    MPU_InitStruct.Number = index;
    MPU_InitStruct.SubRegionDisable = 0u;
    MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL1;
    MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
    MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;
    MPU_InitStruct.IsShareable = MPU_ACCESS_SHAREABLE;
    MPU_InitStruct.IsCacheable = MPU_ACCESS_CACHEABLE;
    MPU_InitStruct.IsBufferable = MPU_ACCESS_BUFFERABLE;
    MPU_AdjustRegionAddressSize(address, size, &MPU_InitStruct);
    HAL_MPU_ConfigRegion(&MPU_InitStruct);
    index++;
  }

  /* Initialize the non cacheable region */
#if defined ( __ICCARM__ )
  /* get the region attribute form the icf file */
  extern uint32_t NONCACHEABLEBUFFER_start;
  extern uint32_t NONCACHEABLEBUFFER_size;

  address = (uint32_t)&NONCACHEABLEBUFFER_start;
  size = (uint32_t)&NONCACHEABLEBUFFER_size;

#elif defined (__CC_ARM) || defined(__ARMCC_VERSION)
  extern uint32_t Image$$RW_NONCACHEABLEBUFFER$$Base;
  extern uint32_t Image$$RW_NONCACHEABLEBUFFER$$Length;
  extern uint32_t Image$$RW_NONCACHEABLEBUFFER$$ZI$$Length;

  address = (uint32_t)&Image$$RW_NONCACHEABLEBUFFER$$Base;
  size  = (uint32_t)&Image$$RW_NONCACHEABLEBUFFER$$Length + (uint32_t)&Image$$RW_NONCACHEABLEBUFFER$$ZI$$Length;
#elif defined ( __GNUC__ )
  extern int __NONCACHEABLEBUFFER_BEGIN;
  extern int __NONCACHEABLEBUFFER_END;

  address = (uint32_t)&__NONCACHEABLEBUFFER_BEGIN;
  size  = (uint32_t)&__NONCACHEABLEBUFFER_END - (uint32_t)&__NONCACHEABLEBUFFER_BEGIN;
#else
#error "Compiler toolchain is unsupported"
#endif

  if (size != 0)
  {
    /* Configure the MPU attributes as Normal Non Cacheable */
    MPU_InitStruct.Enable = MPU_REGION_ENABLE;
    MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
    MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
    MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
    MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
    MPU_InitStruct.Number = index;
    MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL1;
    MPU_InitStruct.SubRegionDisable = 0x00;
    MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;
    MPU_AdjustRegionAddressSize(address, size, &MPU_InitStruct);
    HAL_MPU_ConfigRegion(&MPU_InitStruct);
    index++;
  }

  /* Initialize the region corresponding to the execution area
     (external or internal flash or external or internal RAM
     depending on scatter file definition) */
#if defined ( __ICCARM__ )
  extern uint32_t __ICFEDIT_region_ROM_start__;
  extern uint32_t __ICFEDIT_region_ROM_end__;
  address = (uint32_t)&__ICFEDIT_region_ROM_start__;
  size = (uint32_t)&__ICFEDIT_region_ROM_end__ - (uint32_t)&__ICFEDIT_region_ROM_start__ + 1;
#elif defined (__CC_ARM) || defined(__ARMCC_VERSION)
  extern uint32_t Image$$ER_ROM$$Base;
  extern uint32_t Image$$ER_ROM$$Limit;
  address = (uint32_t)&Image$$ER_ROM$$Base;
  size    = (uint32_t)&Image$$ER_ROM$$Limit-(uint32_t)&Image$$ER_ROM$$Base;
#elif defined ( __GNUC__ )
  extern uint32_t __FLASH_BEGIN;
  extern uint32_t __FLASH_SIZE;
  address = (uint32_t)&__FLASH_BEGIN;
  size  = (uint32_t)&__FLASH_SIZE;
#else
#error "Compiler toolchain is unsupported"
#endif

  MPU_InitStruct.Enable = MPU_REGION_ENABLE;
  MPU_InitStruct.Number = index;
  MPU_InitStruct.SubRegionDisable = 0u;
  MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL1;
  MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
  MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
  MPU_InitStruct.IsShareable = MPU_ACCESS_SHAREABLE;
  MPU_InitStruct.IsCacheable = MPU_ACCESS_CACHEABLE;
  MPU_InitStruct.IsBufferable = MPU_ACCESS_BUFFERABLE;
  MPU_AdjustRegionAddressSize(address, size, &MPU_InitStruct);
  HAL_MPU_ConfigRegion(&MPU_InitStruct);
  index++;

  /* Reset unused MPU regions */
  for(; index < __MPU_REGIONCOUNT ; index++)
  {
    /* All unused regions disabled */
    MPU_InitStruct.Enable = MPU_REGION_DISABLE;
    MPU_InitStruct.Number = index;
    HAL_MPU_ConfigRegion(&MPU_InitStruct);
  }

  /* Enable the MPU */
  HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);
}

/**
  * @brief This function adjusts the MPU region Address and Size within an MPU configuration.
  * @param Address memory address
  * @param Size memory size
  * @param pInit pointer to an MPU initialization structure
  * @retval None
  */
void MPU_AdjustRegionAddressSize(uint32_t Address, uint32_t Size, MPU_Region_InitTypeDef* pInit)
{
  /* Compute the MPU region size */
  pInit->Size = ((31 - __CLZ(Size)) - 1);
  if (Size > (1 << (pInit->Size + 1)))
  {
    pInit->Size++;
  }
  uint32_t Modulo = Address % (1 << (pInit->Size - 1));
  if (0 != Modulo)
  {
    /* Align address with MPU region size considering there is no need to increase the size */
    pInit->BaseAddress = Address - Modulo;
  }
  else
  {
    pInit->BaseAddress = Address;
  }
}

接下来，要在LTDC_init中添加自定义的函数，他主要是重新配置的LTDC的时钟：

 /* Typical PCLK is 25 MHz so the PLL3R is configured to provide this clock */
  /* LCD clock configuration */

  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.PLL1.PLLState = RCC_PLL_NONE;
  RCC_OscInitStruct.PLL2.PLLState = RCC_PLL_NONE;
  RCC_OscInitStruct.PLL3.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL3.PLLSource = RCC_PLLSOURCE_HSI;

  RCC_OscInitStruct.PLL3.PLLM = 4;
  RCC_OscInitStruct.PLL3.PLLN = 25;
  RCC_OscInitStruct.PLL3.PLLP = 2;
  RCC_OscInitStruct.PLL3.PLLQ = 20;
  RCC_OscInitStruct.PLL3.PLLR = 16;
  RCC_OscInitStruct.PLL3.PLLS = 2;
  RCC_OscInitStruct.PLL3.PLLT = 2;
  RCC_OscInitStruct.PLL3.PLLFractional = 0;

  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
   /* Initialization error */
   while(1);
  }
  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_LTDC;
  PeriphClkInit.LtdcClockSelection   = RCC_LTDCCLKSOURCE_PLL3R;

  if(HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
  {
    while(1);
  }
  /* USER CODE END LTDC_MspInit 1 */

  }

到些配置完成，我们把复例文件复制进工程目录里面，效果如封面所示。

image.png

在主程序中，先对MPU进行配置，然后加载LTDC，就可以成功的驱动LCD屏了。

int main(void)
{

  /* USER CODE BEGIN 1 */
  MPU_Config();
  /* USER CODE END 1 */

  /* Enable the CPU Cache */

  /* Enable I-Cache---------------------------------------------------------*/
  SCB_EnableICache();

  /* Enable D-Cache---------------------------------------------------------*/
  SCB_EnableDCache();

  /* MCU Configuration--------------------------------------------------------*/

  /* Update SystemCoreClock variable according to RCC registers values. */
  SystemCoreClockUpdate();

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_LTDC_Init();
赞 收藏 评论4 发布时间：2024-8-5 18:55

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4个回答
chrome777 回答时间：2024-8-7 09:21:10

效率高啊

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KEY1 回答时间：2024-8-7 16:40:10

请问你的芯片选的啥型号？Keil的软件包哪里下载的？Keil官网找不到软件包啊

赞 评论
lugl 回答时间：2024-8-7 20:00:46

KEY1 发表于 2024-8-7 16:40
请问你的芯片选的啥型号？Keil的软件包哪里下载的？Keil官网找不到软件包啊
...

在stm32cube_fw_h7rs_v110.zip的包里面。目录为：\stm32cube_fw_h7rs_v110\STM32Cube_FW_H7RS_V1.1.0\Utilities\PC_Software

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ytwo 回答时间：2024-8-18 17:39:30

可以再详细一些吗？

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