【NXP OKdo E1双核Cortex M33开发板】测评+ OLED屏显示驱动

jinglixixi

有了前面控制LED灯的基础，就可以通过I/O口来模拟I2C通讯了，进而控制I2C接口的OLED屏来显示信息。老外的墨水屏咱没有，但我们可以为OKdo E1开发板配上一个双色OLED屏来媲美。

OLED屏与MCU的连接关系为：

SCL---PIO0_7

SDA---PIO1_0

相关引脚输出高低电平的语句定义：

#define OLED_SCLK_Clr()  GPIO_PinWrite(GPIO, 0u, 7u, 0)

#define OLED_SCLK_Set()  GPIO_PinWrite(GPIO, 0u, 7u, 1)

#define OLED_SDIN_Clr()  GPIO_PinWrite(GPIO, 1u, 0u, 0)

#define OLED_SDIN_Set()  GPIO_PinWrite(GPIO, 1u, 0u, 1)

OLED屏引脚配置函数：

1. void app_oled_init(void)
   
2. {
   
3. gpio_pin_config_t   gpioPinConfig;
   
4. gpioPinConfig.pinDirection = kGPIO_DigitalOutput;
   
5. gpioPinConfig.outputLogic  = 1u;
   
6. GPIO_PinInit (GPIO, 0u, 7u, &gpioPinConfig);
   
7. GPIO_PinInit (GPIO, 1u, 0u, &gpioPinConfig);
   
8. }

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OLED屏初始化函数：

1. void OLED_Init(void)
   
2. {
   
3. Write_IIC_Command(0xAE); //display off
   
4. Write_IIC_Command(0x20); //Set Memory Addressing Mode
   
5. Write_IIC_Command(0x10);
   
6. Write_IIC_Command(0xb0);//Set Page Start Address for Page Addressing Mode,0-7
   
7. Write_IIC_Command(0xc8);//Set COM Output Scan Direction
   
8. Write_IIC_Command(0x00);//---set low column address
   
9. Write_IIC_Command(0x10);//---set high column address
   
10. Write_IIC_Command(0x40);//--set start line address
    
11. Write_IIC_Command(0x81);//--set contrast control register
    
12. Write_IIC_Command(0xdf);
    
13. Write_IIC_Command(0xa1);//--set segment re-map 0 to 127
    
14. Write_IIC_Command(0xa6);//--set normal display
    
15. Write_IIC_Command(0xa8);//--set multiplex ratio(1 to 64)
    
16. Write_IIC_Command(0x3F);//
    
17. Write_IIC_Command(0xa4);//0xa4,Output follows RAM content;0xa5,Output ignores RAM content
    
18. Write_IIC_Command(0xd3);//-set display offset
    
19. Write_IIC_Command(0x00);//-not offset
    
20. Write_IIC_Command(0xd5);//--set display clock divide ratio/oscillator frequency
    
21. Write_IIC_Command(0xf0);//--set divide ratio
    
22. Write_IIC_Command(0xd9);//--set pre-charge period
    
23. Write_IIC_Command(0x22); //
    
24. Write_IIC_Command(0xda);//--set com pins hardware configuration
    
25. Write_IIC_Command(0x12);
    
26. Write_IIC_Command(0xdb);//--set vcomh
    
27. Write_IIC_Command(0x20);//0x20,0.77xVcc
    
28. Write_IIC_Command(0x8d);//--set DC-DC enable
    
29. Write_IIC_Command(0x14);//
    
30. Write_IIC_Command(0xaf);//--turn on oled panel
    
31. }

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OLED屏显示主程序：

1. int main(void)
   
2. {
   
3. POWER_SetBodVbatLevel(kPOWER_BodVbatLevel1650mv, kPOWER_BodHystLevel50mv, false);
   
4. CLOCK_EnableClock(kCLOCK_Gpio0);
   
5. CLOCK_EnableClock(kCLOCK_Gpio1);
   
6. BOARD_BootClockFROHF96M();
   
7. app_oled_init();
   
8. OLED_Init();
   
9. OLED_Clear();
   
10. OLED_ShowString(0,0,"OKDOE1 TEST",16);
    
11. OLED_ShowString(0,2,"OLED Display",16);
    
12. OLED_ShowString(0,4,"jinglixixi",16);
    
13. OLED_ShowString(0,6,"2020.11.2",16);
    
14. while (1)；
    
15. }

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经程序的编译下载，其运行效果如图所示。

OLED屏显示效果