我正在尝试使用来自 STM32CubeF7 的 BSP 库在 stm32f769i-disco 的 LED 上显示一个字符串。然而,什么也没有发生。这是代码:
#include "stm32f7xx_hal.h"
#include "stm32f769i_discovery.h"
#include "stm32f769i_discovery_lcd.h"
#include "stm32f7xx.h"
#include <stdio.h>
char str[] = "Hello from BSP LCD demo!";
void LCDInit() {
// Initialize the LCD using the BSP_LCD_Init() function.
BSP_LCD_Init();
// Select the LCD layer to be used using the BSP_LCD_SelectLayer() function.
//BSP_LCD_SelectLayer(0);
BSP_LCD_LayerDefaultInit(LTDC_DEFAULT_ACTIVE_LAYER, LCD_FB_START_ADDRESS);
BSP_LCD_SelectLayer(LTDC_DEFAULT_ACTIVE_LAYER);
// Enable the LCD display using the BSP_LCD_DisplayOn() function.
BSP_LCD_DisplayOn();
// Clear the whole LCD using BSP_LCD_Clear() function or only one specified string line using the BSP_LCD_ClearStringLine() function.
BSP_LCD_Clear(LCD_COLOR_LIGHTGRAY);
HAL_Delay(1000);
BSP_LCD_SetBackColor(LCD_COLOR_LIGHTGRAY);
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
// Display a character on the specified line and column using the BSP_LCD_DisplayChar() function or a complete string line using the BSP_LCD_DisplayStringAtLine() function.
BSP_LCD_DisplayStringAt(100, 100, str, CENTER_MODE);
}
int main(void) {
LCDInit();
BSP_LED_Init(LED_GREEN);
while(1) {
for (int i=0;i<1000000;i++);
BSP_LED_Toggle(LED_GREEN);
}
return 0;
}
如果我取消对 LCDInit 的调用,我的 LED 会切换,如果我调用 LCDInit,则什么也不会发生(LED 不会切换)并且 LCD 保持黑色。有任何想法吗?
我基本上尝试按照 stm32f769i_discovery_lcd.c 中的说明进行操作,但没有运气:
2. Driver description:
---------------------
+ Initialization steps:
o Initialize the LCD using the BSP_LCD_Init() function.
o Select the LCD layer to be used using the BSP_LCD_SelectLayer() function.
o Enable the LCD display using the BSP_LCD_DisplayOn() function.
+ Options
o Configure and enable the color keying functionality using the
BSP_LCD_SetColorKeying() function.
o Modify in the fly the transparency and/or the frame buffer address
using the following functions:
- BSP_LCD_SetTransparency()
- BSP_LCD_SetLayerAddress()
+ Display on LCD
o Clear the whole LCD using BSP_LCD_Clear() function or only one specified string
line using the BSP_LCD_ClearStringLine() function.
o Display a character on the specified line and column using the BSP_LCD_DisplayChar()
function or a complete string line using the BSP_LCD_DisplayStringAtLine() function.
o Display a string line on the specified position (x,y in pixel) and align mode
using the BSP_LCD_DisplayStringAtLine() function.
o Draw and fill a basic shapes (dot, line, rectangle, circle, ellipse, .. bitmap)
on LCD using the available set of functions.
编辑:使用 OpenOCD 进行调试时,如果我在 BSP_LCD_Init() 行设置断点,gdb 会挂起。如果我再次运行调试器,我可以看到程序卡在 WWDG_IRQHandler() 处。