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受物趣系列的感召開始學習起LPC55S69-EVK開發板的使用，首先要做的就是讓顯示屏亮起來。且顯示屏的尺寸要盡量合適。太小顯示的內容不易分辨，太大的話若顯示屏的分辨率比高，就需要有較高的刷新速度，否則會由于顯示的原因而開銷較多的時間，會影響到對攝像頭獲取數據的響應。 這里選用的是SPI接口的2.2'串口屏，為便于靈活地選用引腳，特以GPIO口模擬SPI通訊的方式來驅動該顯示屏的顯示。 該顯示屏與MCU的連接關系如下： SCK---PIO1_20 SDI---PIO1_21 D/C---PIO1_2 RST---PIO1_3 CS ---PIO0_26 LED---PIO1_1 相關引腳輸出高低電平的語句定義為： #define LCD_SCK_Low() GPIO_PinWrite(GPIO, 1u, 20u, 0) //CLK #define LCD_SCK_High() GPIO_PinWrite(GPIO, 1u, 20u, 1) #define LCD_SDI_Low() GPIO_PinWrite(GPIO, 1u, 21u, 0) //DIN #define LCD_SDI_High() GPIO_PinWrite(GPIO, 1u, 21u, 1) #define LCD_REST_Low() GPIO_PinWrite(GPIO, 1u, 2u, 0) //RES #define LCD_REST_High() GPIO_PinWrite(GPIO,1u, 2u, 1) #define LCD_DC_Low() GPIO_PinWrite(GPIO, 1u, 3u, 0) //DC #define LCD_DC_High() GPIO_PinWrite(GPIO, 1u, 3u, 1) #define LCD_CS_Low() GPIO_PinWrite(GPIO, 0u, 26u, 0) //CS #define LCD_CS_High() GPIO_PinWrite(GPIO, 0u, 26u, 1) #define LCD_LED_Low() GPIO_PinWrite(GPIO, 1u, 1u, 0) //BLK #define LCD_LED_High() GPIO_PinWrite(GPIO, 1u, 1u, 1) 配置相關引腳為輸出功能的函數為： - void app_tft_init(void)
- {
- gpio_pin_config_t gpioPinConfig;
- gpioPinConfig.pinDirection = kGPIO_DigitalOutput;
- gpioPinConfig.outputLogic = 1u;
- GPIO_PinInit (GPIO, 1u, 20u, &gpioPinConfig);
- GPIO_PinInit (GPIO, 1u, 21u, &gpioPinConfig);
- GPIO_PinInit (GPIO, 1u, 2u, &gpioPinConfig);
- GPIO_PinInit (GPIO, 1u, 3u, &gpioPinConfig);
- GPIO_PinInit (GPIO, 0u, 26u, &gpioPinConfig);
- GPIO_PinInit (GPIO, 1u, 1u, &gpioPinConfig);
- LCD_LED_High();
- }
顯示屏顯示圖片的函數為： - void show_pic(const unsigned char *p)
- {
- int i,j;
- unsigned char picH,picL;
- Address_set(0,0,LCD_W-1,LCD_H-1);
- for(i=0;i<240;i++)
- {
- for(j=0;j<320;j++)
- {
- picH=*p++;
- picL=*p++;
- LCD_WR_DATA8(picH);
- LCD_WR_DATA8(picL);
- }
- }
- }
示 效果的主程序為：- int main(void)
- {
- volatile uint8_t s_KeyValue = 0;
- POWER_SetBodVbatLevel(kPOWER_BodVbatLevel1650mv, kPOWER_BodHystLevel50mv, false);
- BOARD_BootClockFROHF96M();
- SystemCoreClockUpdate();
- if (SysTick_Config(SystemCoreClock / 1000U))
- {
- while (1)
- {
- }
- }
- app_tft_init();
- SysTick_DelayTicks(500);
- tft_Init();
- LCD_Clear(WHITE);
- show_pic(gImage_123);
- while(1);
- }
圖片顯示效果
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