CSDN专栏嵌入式程序开发实战嵌入式双范式AI编程嵌入式开发必掌握嵌入式求职面试技术资料第31讲实战——SPI屏驱动快速试错、点亮屏幕一、SPI屏幕驱动基础SPI屏幕是嵌入式常见的显示设备驱动屏幕需要正确配置SPI、理解屏幕控制命令、实现绘图功能。1.1 常见SPI屏幕小尺寸屏幕0.96寸 OLEDSSD1306128x641.3寸 OLEDSH1106128x641.8寸 TFTST7735128x1602.4寸 TFTILI9341240x320SPI接口SCK时钟MOSI主出从入数据MISO主入从出可选CS片选DC数据/命令选择RST复位1.2 驱动要点SPI配置模式主机模式时钟极性/相位根据屏幕芯片确定速率通常10-40MHz数据位8位控制命令初始化序列配置屏幕参数写命令发送控制命令写数据发送显示数据刷新更新显示二、OLED屏幕驱动SSD13062.1 快速试错流程第一步AI生成初始驱动Prompt生成STM32F103 SSD1306 OLED驱动 - SPI1PA5(SCK)、PA7(MOSI) - CSPA4 - DCPA6 - RSTPB0 - 屏幕0.96寸128x64 - 使用HAL库AI生成#includestm32f1xx_hal.h#defineSSD1306_WIDTH128#defineSSD1306_HEIGHT64SPI_HandleTypeDef hspi1;voidSSD1306_Init(void);voidSSD1306_WriteCommand(uint8_tcmd);voidSSD1306_WriteData(uint8_t*data,uint16_tlen);voidSSD1306_Fill(uint8_tcolor);voidSSD1306_Update(void);// CS控制#defineSSD1306_CS_LOW()HAL_GPIO_WritePin(GPIOA,GPIO_PIN_4,GPIO_PIN_RESET)#defineSSD1306_CS_HIGH()HAL_GPIO_WritePin(GPIOA,GPIO_PIN_4,GPIO_PIN_SET)// DC控制#defineSSD1306_DC_LOW()HAL_GPIO_WritePin(GPIOA,GPIO_PIN_6,GPIO_PIN_RESET)// 命令#defineSSD1306_DC_HIGH()HAL_GPIO_WritePin(GPIOA,GPIO_PIN_6,GPIO_PIN_SET)// 数据// RST控制#defineSSD1306_RST_LOW()HAL_GPIO_WritePin(GPIOB,GPIO_PIN_0,GPIO_PIN_RESET)#defineSSD1306_RST_HIGH()HAL_GPIO_WritePin(GPIOB,GPIO_PIN_0,GPIO_PIN_SET)voidSPI1_Init(void){hspi1.InstanceSPI1;hspi1.Init.ModeSPI_MODE_MASTER;hspi1.Init.DirectionSPI_DIRECTION_2LINES;hspi1.Init.DataSizeSPI_DATASIZE_8BIT;hspi1.Init.CLKPolaritySPI_POLARITY_LOW;hspi1.Init.CLKPhaseSPI_PHASE_1EDGE;hspi1.Init.NSSSPI_NSS_SOFT;hspi1.Init.BaudRatePrescalerSPI_BAUDRATEPRESCALER_4;hspi1.Init.FirstBitSPI_FIRSTBIT_MSB;HAL_SPI_Init(hspi1);}voidSSD1306_WriteCommand(uint8_tcmd){SSD1306_CS_LOW();SSD1306_DC_LOW();// 命令模式HAL_SPI_Transmit(hspi1,cmd,1,100);SSD1306_CS_HIGH();}voidSSD1306_WriteData(uint8_t*data,uint16_tlen){SSD1306_CS_LOW();SSD1306_DC_HIGH();// 数据模式HAL_SPI_Transmit(hspi1,data,len,100);SSD1306_CS_HIGH();}voidSSD1306_Init(void){// 复位SSD1306_RST_LOW();HAL_Delay(10);SSD1306_RST_HIGH();HAL_Delay(10);// 初始化序列SSD1306_WriteCommand(0xAE);// 关闭显示SSD1306_WriteCommand(0xD5);// 设置时钟分频SSD1306_WriteCommand(0x80);SSD1306_WriteCommand(0xA8);// 设置多路复用率SSD1306_WriteCommand(0x3F);SSD1306_WriteCommand(0xD3);// 设置显示偏移SSD1306_WriteCommand(0x00);SSD1306_WriteCommand(0x40);// 设置起始行SSD1306_WriteCommand(0x8D);// 电荷泵设置SSD1306_WriteCommand(0x14);SSD1306_WriteCommand(0x20);// 内存地址模式SSD1306_WriteCommand(0x00);// 水平寻址模式SSD1306_WriteCommand(0xA1);// 段重映射SSD1306_WriteCommand(0xC8);// COM输出扫描方向SSD1306_WriteCommand(0xDA);// COM引脚配置SSD1306_WriteCommand(0x12);SSD1306_WriteCommand(0x81);// 对比度控制SSD1306_WriteCommand(0xCF);SSD1306_WriteCommand(0xD9);// 预充电周期SSD1306_WriteCommand(0xF1);SSD1306_WriteCommand(0xDB);// VCOMH电压SSD1306_WriteCommand(0x40);SSD1306_WriteCommand(0xA4);// 全屏点亮关闭SSD1306_WriteCommand(0xA6);// 正常显示SSD1306_WriteCommand(0xAF);// 开启显示}staticuint8_tSSD1306_Buffer[SSD1306_WIDTH*SSD1306_HEIGHT/8];voidSSD1306_Fill(uint8_tcolor){memset(SSD1306_Buffer,color?0xFF:0x00,sizeof(SSD1306_Buffer));}voidSSD1306_Update(void){for(uint8_tpage0;page8;page){SSD1306_WriteCommand(0xB0page);SSD1306_WriteCommand(0x00);SSD1306_WriteCommand(0x10);SSD1306_WriteData(SSD1306_Buffer[page*SSD1306_WIDTH],SSD1306_WIDTH);}}第二步测试验证intmain(void){HAL_Init();SystemClock_Config();SPI1_Init();SSD1306_Init();// 清屏SSD1306_Fill(0);SSD1306_Update();// 全白SSD1306_Fill(1);SSD1306_Update();while(1);}第三步迭代修正如果屏幕不亮添加调试voidSSD1306_Debug(void){printf(SSD1306 Debug:\r\n);printf(SPI CR1: 0x%04X\r\n,SPI1-CR1);printf(GPIOA CRL: 0x%08X\r\n,GPIOA-CRL);printf(GPIOB CRL: 0x%08X\r\n,GPIOB-CRL);}三、TFT屏幕驱动ST77353.1 ST7735驱动Prompt生成STM32F103 ST7735 TFT驱动 - SPI1PA5(SCK)、PA7(MOSI) - CSPA4 - DCPA6 - RSTPB0 - 屏幕1.8寸128x160 - 使用HAL库AI生成核心代码#defineST7735_WIDTH128#defineST7735_HEIGHT160voidST7735_WriteCommand(uint8_tcmd){ST7735_CS_LOW();ST7735_DC_LOW();HAL_SPI_Transmit(hspi1,cmd,1,100);ST7735_CS_HIGH();}voidST7735_WriteData(uint8_tdata){ST7735_CS_LOW();ST7735_DC_HIGH();HAL_SPI_Transmit(hspi1,data,1,100);ST7735_CS_HIGH();}voidST7735_SetWindow(uint8_tx0,uint8_ty0,uint8_tx1,uint8_ty1){ST7735_WriteCommand(0x2A);// 列地址设置ST7735_WriteData(0x00);ST7735_WriteData(x0);ST7735_WriteData(0x00);ST7735_WriteData(x1);ST7735_WriteCommand(0x2B);// 行地址设置ST7735_WriteData(0x00);ST7735_WriteData(y0);ST7735_WriteData(0x00);ST7735_WriteData(y1);ST7735_WriteCommand(0x2C);// 写内存}voidST7735_DrawPixel(uint8_tx,uint8_ty,uint16_tcolor){ST7735_SetWindow(x,y,x,y);uint8_tdata[2];data[0]color8;data[1]color0xFF;ST7735_CS_LOW();ST7735_DC_HIGH();HAL_SPI_Transmit(hspi1,data,2,100);ST7735_CS_HIGH();}voidST7735_FillColor(uint16_tcolor){ST7735_SetWindow(0,0,ST7735_WIDTH-1,ST7735_HEIGHT-1);uint8_tdata[2];data[0]color8;data[1]color0xFF;ST7735_CS_LOW();ST7735_DC_HIGH();for(uint16_ti0;iST7735_WIDTH*ST7735_HEIGHT;i){HAL_SPI_Transmit(hspi1,data,2,100);}ST7735_CS_HIGH();}四、绘图功能实现4.1 基础绘图函数画线voidSSD1306_DrawLine(uint8_tx0,uint8_ty0,uint8_tx1,uint8_ty1){int16_tdxabs(x1-x0);int16_tdyabs(y1-y0);int16_tsx(x0x1)?1:-1;int16_tsy(y0y1)?1:-1;int16_terrdx-dy;while(1){SSD1306_DrawPixel(x0,y0,1);if(x0x1y0y1)break;int16_te22*err;if(e2-dy){err-dy;x0sx;}if(e2dx){errdx;y0sy;}}}画矩形voidSSD1306_DrawRect(uint8_tx,uint8_ty,uint8_tw,uint8_th){SSD1306_DrawLine(x,y,xw-1,y);SSD1306_DrawLine(x,yh-1,xw-1,yh-1);SSD1306_DrawLine(x,y,x,yh-1);SSD1306_DrawLine(xw-1,y,xw-1,yh-1);}画圆voidSSD1306_DrawCircle(uint8_tx0,uint8_ty0,uint8_tr){int16_tf1-r;int16_tddF_x1;int16_tddF_y-2*r;int16_tx0;int16_tyr;SSD1306_DrawPixel(x0,y0r,1);SSD1306_DrawPixel(x0,y0-r,1);SSD1306_DrawPixel(x0r,y0,1);SSD1306_DrawPixel(x0-r,y0,1);while(xy){if(f0){y--;ddF_y2;fddF_y;}x;ddF_x2;fddF_x;SSD1306_DrawPixel(x0x,y0y,1);SSD1306_DrawPixel(x0-x,y0y,1);SSD1306_DrawPixel(x0x,y0-y,1);SSD1306_DrawPixel(x0-x,y0-y,1);SSD1306_DrawPixel(x0y,y0x,1);SSD1306_DrawPixel(x0-y,y0x,1);SSD1306_DrawPixel(x0y,y0-x,1);SSD1306_DrawPixel(x0-y,y0-x,1);}}4.2 显示文字ASCII字符显示// 5x7字体constuint8_tfont5x7[]{0x00,0x00,0x00,0x00,0x00,// 空格0x00,0x00,0x5F,0x00,0x00,// !// ... 字体数据};voidSSD1306_DrawChar(uint8_tx,uint8_ty,charc){for(uint8_ti0;i5;i){uint8_tlinefont5x7[(c-32)*5i];for(uint8_tj0;j7;j){if(line(1j)){SSD1306_DrawPixel(xi,yj,1);}}}}voidSSD1306_DrawString(uint8_tx,uint8_ty,char*str){while(*str){SSD1306_DrawChar(x,y,*str);x6;str;}}五、常见问题与解决5.1 屏幕不亮原因1. SPI配置错误 2. 初始化序列错误 3. 引脚配置错误 4. 复位时序错误解决// 验证SPI配置voidSPI_Debug(void){printf(SPI Configuration:\r\n);printf(Mode: %d\r\n,hspi1.Init.Mode);printf(BaudRate: %d\r\n,hspi1.Init.BaudRatePrescaler);printf(CLKPolarity: %d\r\n,hspi1.Init.CLKPolarity);printf(CLKPhase: %d\r\n,hspi1.Init.CLKPhase);}5.2 显示异常原因1. 内存地址模式错误 2. 扫描方向错误 3. 颜色格式错误解决// 调整内存地址模式SSD1306_WriteCommand(0x20);// 内存地址模式SSD1306_WriteCommand(0x00);// 水平寻址模式// 调整扫描方向SSD1306_WriteCommand(0xA1);// 段重映射SSD1306_WriteCommand(0xC8);// COM输出扫描方向六、本讲核心要点6.1 记住这三句话SPI屏幕驱动正确配置SPI、理解控制命令、实现绘图功能快速试错AI生成初始驱动→测试验证→迭代修正常见问题SPI配置、初始化序列、引脚配置、复位时序6.2 实践建议对于新手学习SPI配置理解屏幕控制命令实践绘图功能对于有经验工程师建立屏幕驱动模板库优化绘图性能实现高级功能6.3 下讲预告第32讲将深入讲解实战I2C传感器极简驱动快速验证I2C传感器驱动如何快速验证下一讲将以具体传感器为例详细讲解。
