本帖最后由 jinglixixi 于 2023-8-7 10:22 编辑
在HC32L196开发板上配有一个笔段式的液晶屏，但它的信息表现力还是较为有限，且占用引脚资源较多。为此，可以I2C接口的OLED屏来承担显示任务，其与开发板的连接关系为： PA11：SCL PA12：SDA 使这2个引脚输出高低电平的语句定义为： #define OLED_SCLK_Set() Gpio_SetIO(GpioPortA, GpioPin11) #define OLED_SCLK_Clr() Gpio_ClrIO(GpioPortA, GpioPin11) #define OLED_SDIN_Set() Gpio_SetIO(GpioPortA, GpioPin12) #define OLED_SDIN_Clr() Gpio_ClrIO(GpioPortA, GpioPin12)
图1 使用接口
配置这2个引脚为输出功能的函数为： - void App_OledInit(void)
- {
- stc_gpio_cfg_t stcGpioCfg;
- ///< 打开GPIO外设时钟门控
- Sysctrl_SetPeripheralGate(SysctrlPeripheralGpio, TRUE);
- ///< 端口方向配置->输出(其它参数与以上（输入）配置参数一致)
- stcGpioCfg.enDir = GpioDirOut;
- ///< 端口上下拉配置->下拉
- stcGpioCfg.enPu = GpioPuDisable;
- stcGpioCfg.enPd = GpioPdEnable;
- ///< GPIO IO OLED端口初始化
- Gpio_Init(GpioPortA, GpioPin11, &stcGpioCfg);
- Gpio_Init(GpioPortA, GpioPin12, &stcGpioCfg);
- }
该显示屏的初始化函数为： - void OLED_Init(void)
- {
- Write_IIC_Command(0xAE);
- Write_IIC_Command(0x20);
- Write_IIC_Command(0x10);
- Write_IIC_Command(0xb0);
- Write_IIC_Command(0xc8);
- Write_IIC_Command(0x00);
- Write_IIC_Command(0x10);
- Write_IIC_Command(0x40);
- Write_IIC_Command(0x81);
- Write_IIC_Command(0xdf);
- Write_IIC_Command(0xa1);
- Write_IIC_Command(0xa6);
- Write_IIC_Command(0xa8);
- Write_IIC_Command(0x3F);
- Write_IIC_Command(0xa4);
- Write_IIC_Command(0xd3);
- Write_IIC_Command(0x00);
- Write_IIC_Command(0xd5);
- Write_IIC_Command(0xf0);
- Write_IIC_Command(0xd9);
- Write_IIC_Command(0x22);
- Write_IIC_Command(0xda);
- Write_IIC_Command(0x12);
- Write_IIC_Command(0xdb);
- Write_IIC_Command(0x20);
- Write_IIC_Command(0x8d);
- Write_IIC_Command(0x14);
- Write_IIC_Command(0xaf);
- }
实现清屏处理的函数为：‘ - void OLED_Clear(void)
- {
- uint8_t i,n;
- for(i=0;i<8;i++)
- {
- OLED_WR_Byte (0xb0+i,OLED_CMD);
- OLED_WR_Byte (0x00,OLED_CMD);
- OLED_WR_Byte (0x10,OLED_CMD);
- for(n=0;n<128;n++)OLED_WR_Byte(0,OLED_DATA);
- }
- }
实现字符显示功能的函数为： - void OLED_ShowChar(uint8_t x,uint8_t y,uint8_t chr,uint8_t Char_Size)
- {
- unsigned char c=0,i=0;
- c=chr-' ';
- if(x>Max_Column-1){x=0;y=y+2;}
- if(Char_Size ==16)
- {
- OLED_Set_Pos(x,y);
- for(i=0;i<8;i++)
- OLED_WR_Byte(F8X16[c*16+i],OLED_DATA);
- OLED_Set_Pos(x,y+1);
- for(i=0;i<8;i++)
- OLED_WR_Byte(F8X16[c*16+i+8],OLED_DATA);
- }
- else {
- OLED_Set_Pos(x,y);
- for(i=0;i<6;i++)
- OLED_WR_Byte(F6x8[c][i],OLED_DATA);
- }
- }
实现字符串显示功能的函数为： - void OLED_ShowString(uint8_t x,uint8_t y,uint8_t *chr,uint8_t Char_Size)
- {
- unsigned char j=0;
- while (chr[j]!='\0')
- {
显示显示功能测试的主程序为： - int32_t main(void)
- {
- ///< LED端口初始化
- App_LedInit();
- App_OledInit();
- OLED_Init();
- OLED_Clear();
- OLED_ShowString(0,0,"HC32L196 TEST",16);
- OLED_ShowString(0,2,"OLED DISPLAY",16);
- while(1)
- {
- ///< LED点亮
- Gpio_SetIO(STK_LED_PORT, STK_LED_PIN);
- delay1ms(1000);
- ///< LED关闭
- Gpio_ClrIO(STK_LED_PORT, STK_LED_PIN);
- delay1ms(1000);
- }
- }
经程序的编译与下载，其显示效果如图2所示。 图2 显示效果
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