【MCU实战经验】STM32F429I-DISO探索第一篇 --GPIO LCD显示状态
上一篇写了GPIO简单的流水灯测试，看着有点单调，习惯了串口调试，板子上没有串口 那就另想办法吧，看着LCD突然有了个想法，为什么不把调试信息输出到LCD上，以前在做2416 WINCE开发的时候就经常这样干非常直观，那说干就干。STM32F429I-DISO SDK里已经把开发包做好，那就直接拿过来用吧。
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[*]#define MESSAGE1 "STM32F429I-Discoverry" //提示信息
[*]#define MESSAGE1_1 " GPIO TEST "
[*]#define MESSAGE2 " LED3 LED4 "
[*]#define MESSAGE2_1 " ^-^ "
[*]#define MESSAGE5 " LED3 = %d" //LED3状态 1亮 0灭
[*]#define MESSAGE6 " LED4 = %d" //LED4状态
[*]#define LINENUM 0x15 //行数
[*]#define FONTSIZE Font12x12 //字体大小
定义完了，那就该具体实现了，惯例先初始化 LCD初始化实现：
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[*]static void Display_Init(void)
[*]{
[*] /* Initialize the LCD */
[*] LCD_Init();
[*] LCD_LayerInit();
[*] /* Eable the LTDC */
[*] LTDC_Cmd(ENABLE);
[*]
[*] /* Set LCD Background Layer */
[*] LCD_SetLayer(LCD_BACKGROUND_LAYER);
[*]
[*] /* Clear the Background Layer */
[*] LCD_Clear(LCD_COLOR_WHITE);
[*]
[*] /* Configure the transparency for background */
[*] LCD_SetTransparency(0);
[*]
[*] /* Set LCD Foreground Layer */
[*] LCD_SetLayer(LCD_FOREGROUND_LAYER);
[*]
[*] /* Configure the transparency for foreground */
[*] LCD_SetTransparency(200);
[*]
[*] /* Clear the Foreground Layer */
[*] LCD_Clear(LCD_COLOR_WHITE);
[*]
[*] /* Set the LCD Back Color and Text Color*/
[*] LCD_SetBackColor(LCD_COLOR_BLUE);
[*] LCD_SetTextColor(LCD_COLOR_WHITE);
[*]
[*] /* Set the LCD Text size */
[*] LCD_SetFont(&FONTSIZE);
[*]
[*] /* Set the LCD Back Color and Text Color*/
[*] LCD_SetBackColor(LCD_COLOR_BLUE);
[*] LCD_SetTextColor(LCD_COLOR_WHITE);
[*]
[*] LCD_DisplayStringLine(LINE(LINENUM), (uint8_t*)MESSAGE1);
[*] LCD_DisplayStringLine(LINE(LINENUM + 1), (uint8_t*)MESSAGE1_1);
[*] LCD_DisplayStringLine(LINE(0x17), (uint8_t*)" ");
[*]
[*] /* Set the LCD Text size */
[*] LCD_SetFont(&Font16x24);
[*]
[*] LCD_DisplayStringLine(LCD_LINE_0, (uint8_t*)MESSAGE2);
[*] LCD_DisplayStringLine(LCD_LINE_1, (uint8_t*)MESSAGE2_1);
[*]
[*] /* Set the LCD Back Color and Text Color*/
[*] LCD_SetBackColor(LCD_COLOR_WHITE);
[*] LCD_SetTextColor(LCD_COLOR_BLUE);
[*]}
初始化完成了，那就改实现显示函数了
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[*]static void Display(void)
[*]{
[*] uint8_t led3 = 0, led4 = 0;
[*] uint8_t aTextBuffer;
[*]
[*] led3 = GPIO_ReadOutputDataBit(LED3_GPIO_PORT,LED3_PIN); //读取LED3对应引脚值
[*]
[*] sprintf((char*)aTextBuffer, MESSAGE5, led3);
[*] LCD_DisplayStringLine(LCD_LINE_4, (uint8_t*)aTextBuffer); //把LED3状态更新到屏幕上
[*]
[*] led4 = GPIO_ReadOutputDataBit(LED3_GPIO_PORT,LED4_PIN); //读取LED4对应引脚值
[*] sprintf((char*)aTextBuffer, MESSAGE6, led4);
[*] LCD_DisplayStringLine(LCD_LINE_6, (uint8_t*)aTextBuffer); //把LED4状态更新到屏幕上
[*]}
这就是显示函数，读取LED对应的值，组成字符串，最后更新到LCD，LCD显示。
接下来就改主函数了：
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[*]int main(void)
[*]{
[*] int i;
[*]
[*] Display_Init();
[*] LEDInit();
[*] SysTickInit();
[*] while (1)
[*] {
[*] Delay(500);
[*] GPIO_SetBits(LED4_GPIO_PORT,LED4_PIN);
[*] GPIO_ResetBits(LED3_GPIO_PORT,LED3_PIN);
[*] Display();
[*] Delay(500);
[*] GPIO_SetBits(LED3_GPIO_PORT,LED3_PIN);
[*] GPIO_ResetBits(LED4_GPIO_PORT,LED4_PIN);
[*] Display();
[*] }
[*]}
惯例，主要函数部分实现完了，那就看最终的显示结果吧.
http://img.blog.csdn.net/20131219221329640?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvZmZlaWdlMTk4NA==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
http://img.blog.csdn.net/20131219221415140?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvZmZlaWdlMTk4NA==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
RE:STM32F429I-DISO探索第一篇 --GPIO LCD显示状态
用stlink调试就知道了。从前我也是用串口的。遇到这板子没串口，就改用stlink了。
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