该工程所在位置 STM32Cube_FW_L5_V1.5.0\Projects\STM32L562E-DK\Examples\BSP\MDK-ARM
打开工程，找到main.c的main函数，查看硬件初始化函数
复制
static void SystemHardwareInit(void){/* Init LEDs */if (LedInitialized != SET){if (BSP_LED_Init(LED9) != BSP_ERROR_NONE){Error_Handler();}if (BSP_LED_Init(LED10) != BSP_ERROR_NONE){Error_Handler();}LedInitialized = SET;}/* Init User push-button in EXTI Mode */if (ButtonInitialized != SET){if (BSP_PB_Init(BUTTON_USER, BUTTON_MODE_EXTI) != BSP_ERROR_NONE){Error_Handler();}ButtonInitialized = SET;}/* Initialize the LCD */if (LcdInitialized != SET){LCD_UTILS_Drv_t lcdDrv;/* Initialize the LCD */if (BSP_LCD_Init(0, LCD_ORIENTATION_PORTRAIT) != BSP_ERROR_NONE){Error_Handler();}/* Set UTIL_LCD functions */lcdDrv.DrawBitmap = BSP_LCD_DrawBitmap;lcdDrv.FillRGBRect = BSP_LCD_FillRGBRect;lcdDrv.DrawHLine = BSP_LCD_DrawHLine;lcdDrv.DrawVLine = BSP_LCD_DrawVLine;lcdDrv.FillRect = BSP_LCD_FillRect;lcdDrv.GetPixel = BSP_LCD_ReadPixel;lcdDrv.SetPixel = BSP_LCD_WritePixel;lcdDrv.GetXSize = BSP_LCD_GetXSize;lcdDrv.GetYSize = BSP_LCD_GetYSize;lcdDrv.SetLayer = BSP_LCD_SetActiveLayer;lcdDrv.GetFormat = BSP_LCD_GetFormat;UTIL_LCD_SetFuncDriver(&lcdDrv);/* Clear the LCD */UTIL_LCD_Clear(UTIL_LCD_COLOR_WHITE);/* Set the display on */if (BSP_LCD_DisplayOn(0) != BSP_ERROR_NONE){Error_Handler();}LcdInitialized = SET;}/* Initialize the TouchScreen */if (TsInitialized != SET){TS_Init_t TsInit;/* Initialize the TouchScreen */TsInit.Width = 240;TsInit.Height = 240;TsInit.Orientation = TS_ORIENTATION_PORTRAIT;TsInit.Accuracy = 10;if (BSP_TS_Init(0, &TsInit) != BSP_ERROR_NONE){Error_Handler();}/* Configure TS interrupt */if (BSP_TS_EnableIT(0) != BSP_ERROR_NONE){Error_Handler();}TsInitialized = SET;}}
该函数对LED 、按钮、LCD屏幕、触摸屏进行初始化，并由初始化完成标志位变量进行置位。
LED的初始化函数如下
复制
int32_t BSP_LED_Init(Led_TypeDef Led){int32_t status = BSP_ERROR_NONE;GPIO_InitTypeDef GPIO_Init;/* Enable the GPIO_LED Clock */if (Led == LED9){LED9_GPIO_CLK_ENABLE();}else /* Led = LED10 */{/* Enable VddIO2 for GPIOG */__HAL_RCC_PWR_CLK_ENABLE();HAL_PWREx_EnableVddIO2();LED10_GPIO_CLK_ENABLE();}/* configure the GPIO_LED pin */GPIO_Init.Pin = LED_PIN[Led];GPIO_Init.Mode = GPIO_MODE_OUTPUT_PP;GPIO_Init.Pull = GPIO_PULLUP;GPIO_Init.Speed = GPIO_SPEED_FREQ_VERY_HIGH;HAL_GPIO_Init(LED_PORT[Led], &GPIO_Init);HAL_GPIO_WritePin(LED_PORT[Led], LED_PIN[Led], GPIO_PIN_SET);return status;}
该函数对IO所在的时钟进行了启用，并对IO进行配置，配置为输出高电平。
按钮的配置，如下
复制
int32_t BSP_PB_Init(Button_TypeDef Button, ButtonMode_TypeDef ButtonMode){int32_t status = BSP_ERROR_NONE;GPIO_InitTypeDef GPIO_Init;uint32_t BSP_BUTTON_IT_PRIO[BUTTONn] = {BSP_BUTTON_USER_IT_PRIORITY};uint32_t BUTTON_EXTI_LINE[BUTTONn] = {BUTTON_USER_EXTI_LINE};BSP_EXTI_LineCallback ButtonCallback[BUTTONn] = {BUTTON_USER_EXTI_Callback};/* Enable the BUTTON clock */BUTTON_USER_GPIO_CLK_ENABLE();GPIO_Init.Pin = BUTTON_PIN[Button];GPIO_Init.Pull = GPIO_NOPULL;GPIO_Init.Speed = GPIO_SPEED_FREQ_HIGH;if (ButtonMode == BUTTON_MODE_GPIO){/* Configure Button pin as input */GPIO_Init.Mode = GPIO_MODE_INPUT;HAL_GPIO_Init(BUTTON_PORT[Button], &GPIO_Init);}if (ButtonMode == BUTTON_MODE_EXTI){/* Configure Button pin as input with External interrupt */GPIO_Init.Mode = GPIO_MODE_IT_RISING;HAL_GPIO_Init(BUTTON_PORT[Button], &GPIO_Init);if (HAL_EXTI_GetHandle(&hpb_exti[Button], BUTTON_EXTI_LINE[Button]) == HAL_OK){if (HAL_EXTI_RegisterCallback(&hpb_exti[Button], HAL_EXTI_RISING_CB_ID, ButtonCallback[Button]) == HAL_OK){/* Enable and set Button EXTI Interrupt to the lowest priority */HAL_NVIC_SetPriority(BUTTON_IRQn[Button], BSP_BUTTON_IT_PRIO[Button], 0x00);HAL_NVIC_EnableIRQ(BUTTON_IRQn[Button]);}else{status = BSP_ERROR_PERIPH_FAILURE;}}else{status = BSP_ERROR_PERIPH_FAILURE;}}return status;}
可配置为IO模式和中断模式
复制
<div>static void BUTTON_USER_EXTI_Callback(void)</div><div>{</div><div> BSP_PB_Callback(BUTTON_USER);</div><div>}</div><div></div><div><div>__weak void BSP_PB_Callback(Button_TypeDef Button)</div><div>{</div><div> /* Prevent unused argument(s) compilation warning */</div><div> UNUSED(Button);</div><div></div><div> /* This function should be implemented by the user application.</div><div> It is called into this driver when an event on Button is triggered. */</div><div>}</div></div>
层层嵌套，不知道这么做目的是不是为了可移植性。
LCD的硬件接口初始化采用如下函数
复制
int32_t BSP_LCD_Init(uint32_t Instance, uint32_t Orientation){int32_t status = BSP_ERROR_NONE;if ((Instance >= LCD_INSTANCES_NBR) || (Orientation > LCD_ORIENTATION_LANDSCAPE_ROT180)){status = BSP_ERROR_WRONG_PARAM;}else{/* Power up LCD */ST7789H2_PowerUp();/* Probe the LCD driver */if (ST7789H2_Probe(Orientation) != BSP_ERROR_NONE){status = BSP_ERROR_COMPONENT_FAILURE;}}return status;}
根据函数定义到定义引脚的宏，知道了供电控制引脚、复位引脚、背光引脚，
复制
#define LCD_POWER_GPIO_PORT GPIOH#define LCD_POWER_GPIO_PIN GPIO_PIN_0#define LCD_POWER_GPIO_CLOCK_ENABLE() __HAL_RCC_GPIOH_CLK_ENABLE()#define LCD_RESET_GPIO_PORT GPIOF#define LCD_RESET_GPIO_PIN GPIO_PIN_14#define LCD_RESET_GPIO_CLOCK_ENABLE() __HAL_RCC_GPIOF_CLK_ENABLE()#define LCD_BACKLIGHT_GPIO_PORT GPIOE#define LCD_BACKLIGHT_GPIO_PIN GPIO_PIN_1#define LCD_BACKLIGHT_GPIO_CLOCK_ENABLE() __HAL_RCC_GPIOE_CLK_ENABLE()
上电函数就是对LCD供电、复位、以及打开背光
复制
static void ST7789H2_PowerUp(void){GPIO_InitTypeDef GPIO_InitStruct;/* Initialize and configure the ST7789H2 power pin */LCD_POWER_GPIO_CLOCK_ENABLE();GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;GPIO_InitStruct.Pull = GPIO_NOPULL;GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;GPIO_InitStruct.Pin = LCD_POWER_GPIO_PIN;HAL_GPIO_Init(LCD_POWER_GPIO_PORT, &GPIO_InitStruct);/* Power on the ST7789H2 */HAL_GPIO_WritePin(LCD_POWER_GPIO_PORT, LCD_POWER_GPIO_PIN, GPIO_PIN_RESET);/* Initialize and configure the ST7789H2 reset pin */LCD_RESET_GPIO_CLOCK_ENABLE();GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;GPIO_InitStruct.Pull = GPIO_NOPULL;GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;GPIO_InitStruct.Pin = LCD_RESET_GPIO_PIN;HAL_GPIO_Init(LCD_RESET_GPIO_PORT, &GPIO_InitStruct);/* Reset the ST7789H2 */HAL_GPIO_WritePin(LCD_RESET_GPIO_PORT, LCD_RESET_GPIO_PIN, GPIO_PIN_RESET);HAL_Delay(1); /* wait at least 10us according ST7789H2 datasheet */HAL_GPIO_WritePin(LCD_RESET_GPIO_PORT, LCD_RESET_GPIO_PIN, GPIO_PIN_SET);HAL_Delay(120); /* wait maximum 120ms according ST7789H2 datasheet *//* Initialize GPIO for backlight control and enable backlight */LCD_BACKLIGHT_GPIO_CLOCK_ENABLE();GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;GPIO_InitStruct.Pull = GPIO_NOPULL;GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;GPIO_InitStruct.Pin = LCD_BACKLIGHT_GPIO_PIN;HAL_GPIO_Init(LCD_BACKLIGHT_GPIO_PORT, &GPIO_InitStruct);HAL_GPIO_WritePin(LCD_BACKLIGHT_GPIO_PORT, LCD_BACKLIGHT_GPIO_PIN, GPIO_PIN_SET);}
该LCD采用了并口发送数据
复制
/** @defgroup STM32L562E-DK_LCD_Private_Functions STM32L562E-DK LCD Private Functions* @{*//*** [url=home.php?mod=space&uid=247401]@brief[/url] Probe the ST7789H2 LCD driver.* @param Orientation LCD_ORIENTATION_PORTRAIT, LCD_ORIENTATION_LANDSCAPE,* LCD_ORIENTATION_PORTRAIT_ROT180 or LCD_ORIENTATION_LANDSCAPE_ROT180.* @retval BSP status.*/static int32_t ST7789H2_Probe(uint32_t Orientation){int32_t status;ST7789H2_IO_t IOCtx;uint32_t st7789h2_id;static ST7789H2_Object_t ST7789H2Obj;uint32_t lcd_orientation;/* Configure the LCD driver */IOCtx.Address = LCD_FMC_ADDRESS;IOCtx.Init = LCD_FMC_Init;IOCtx.DeInit = LCD_FMC_DeInit;IOCtx.ReadReg = LCD_FMC_ReadReg16;IOCtx.WriteReg = LCD_FMC_WriteReg16;IOCtx.SendData = LCD_FMC_Send;IOCtx.GetTick = LCD_FMC_GetTick;if (ST7789H2_RegisterBusIO(&ST7789H2Obj, &IOCtx) != ST7789H2_OK){status = BSP_ERROR_BUS_FAILURE;}else if (ST7789H2_ReadID(&ST7789H2Obj, &st7789h2_id) != ST7789H2_OK){status = BSP_ERROR_COMPONENT_FAILURE;}else if (st7789h2_id != ST7789H2_ID){status = BSP_ERROR_UNKNOWN_COMPONENT;}else{Lcd_CompObj[0] = &ST7789H2Obj;Lcd_Drv[0] = (LCD_Drv_t *) &ST7789H2_Driver;if (Orientation == LCD_ORIENTATION_PORTRAIT){lcd_orientation = ST7789H2_ORIENTATION_PORTRAIT;}else if (Orientation == LCD_ORIENTATION_LANDSCAPE){lcd_orientation = ST7789H2_ORIENTATION_LANDSCAPE;}else if (Orientation == LCD_ORIENTATION_PORTRAIT_ROT180){lcd_orientation = ST7789H2_ORIENTATION_PORTRAIT_ROT180;}else{lcd_orientation = ST7789H2_ORIENTATION_LANDSCAPE_ROT180;}if (Lcd_Drv[0]->Init(Lcd_CompObj[0], ST7789H2_FORMAT_RBG565, lcd_orientation) < 0){status = BSP_ERROR_COMPONENT_FAILURE;}else{status = BSP_ERROR_NONE;}}return status;}
采用FMC地址给屏幕发送数据
复制
#define LCD_REGISTER_ADDR FMC_BANK1_1#define LCD_DATA_ADDR (FMC_BANK1_1 | 0x00000002UL)#define LCD_FMC_ADDRESS 1U
复制
static void Display_DemoDescription(void){char desc[60];/* Set font */UTIL_LCD_SetFont(&Font20);/* Clear the LCD */UTIL_LCD_Clear(UTIL_LCD_COLOR_WHITE);/* Set the LCD Text Color */UTIL_LCD_SetTextColor(UTIL_LCD_COLOR_DARKBLUE);UTIL_LCD_SetBackColor(UTIL_LCD_COLOR_WHITE);/* Display LCD messages */UTIL_LCD_DisplayStringAt(0, 10, (uint8_t *)"STM32L562E-DK BSP", CENTER_MODE);UTIL_LCD_DisplayStringAt(0, 35, (uint8_t *)"drivers example", CENTER_MODE);/* Draw Bitmap */UTIL_LCD_DrawBitmap(80, 65, (uint8_t *)st**);UTIL_LCD_SetFont(&Font8);UTIL_LCD_DisplayStringAt(0, 220, (uint8_t *)"Copyright (c) STMicroelectronics 2019", CENTER_MODE);UTIL_LCD_SetFont(&Font12);UTIL_LCD_FillRect(0, 145, 240, 50, UTIL_LCD_COLOR_BLUE);UTIL_LCD_SetTextColor(UTIL_LCD_COLOR_WHITE);UTIL_LCD_SetBackColor(UTIL_LCD_COLOR_BLUE);UTIL_LCD_DisplayStringAt(0, 150, (uint8_t *)"Press User push-button", CENTER_MODE);UTIL_LCD_DisplayStringAt(0, 165, (uint8_t *)"to start :", CENTER_MODE);sprintf(desc,"%s example", BSP_examples[DemoIndex].DemoName);UTIL_LCD_DisplayStringAt(0, 180, (uint8_t *)desc, CENTER_MODE);}
编译工程烧录
效果不错，这个工程里出现了函数指针结构体，比较难的一个知识点。
复制
typedef int32_t (*ST7789H2_Write_Func)(void *, uint16_t, uint8_t *, uint32_t);typedef int32_t (*ST7789H2_Read_Func)(void *, uint16_t, uint8_t *, uint32_t);typedef int32_t (*ST7789H2_Send_Func)(void *, uint8_t *, uint32_t);typedef struct{ST7789H2_Write_Func WriteReg;ST7789H2_Read_Func ReadReg;ST7789H2_Send_Func SendData;void *handle;} ST7789H2_ctx_t;
---------------------
作者：gaoyang9992006
链接：https://bbs.21ic.com/icview-3430608-1-1.html
来源：21ic.com
此文章已获得原创/原创奖标签，著作权归21ic所有，任何人未经允许禁止转载。
)
