[分享] 【国民技术N32WB031_STB开发板评测】SPI驱动墨水屏

lugl4313820 2023-4-29 13:25 楼主

这款芯片主打蓝牙低功耗，而墨水屏也是以低功耗而生。结合起来，那肯定是完美：

【实现步骤】

拷贝模版工程，添加bsp/lcd工程：

2. 添加spi端口定义：

/*   ***     墨水屏IO定义      *****************                             
*			MOSI    PA2
*			SCK     PA1
*			CS      PA3
*			DC      PA4
*			RST     PA5
*			BUSY    PA6
**********   定义结束   ***********************/
#define EP_MOSI_GPIO_Port     GPIOA
#define EP_SCK_GPIO_Port      GPIOA
#define EPD_W21_CS_Port       GPIOA
#define EPD_W21_DC_Port       GPIOA
#define EPD_W21_RST_Port      GPIOA
#define EP_BUSY_GPIO_Port     GPIOA

#define EP_MOSI_Pin           GPIO_PIN_2
#define EP_SCK_Pin            GPIO_PIN_1
#define EP_CS_Pin             GPIO_PIN_3
#define EP_DC_Pin             GPIO_PIN_4
#define EP_REST_Pin           GPIO_PIN_5
#define EP_BUSY_Pin           GPIO_PIN_6

#define EPD_W21_MOSI_0	EP_MOSI_GPIO_Port->PBC = (uint32_t)EP_MOSI_Pin
#define EPD_W21_MOSI_1	EP_MOSI_GPIO_Port->PBSC = (uint32_t)EP_MOSI_Pin

#define EPD_W21_CLK_0	EP_SCK_GPIO_Port->PBC = (uint32_t)EP_SCK_Pin
#define EPD_W21_CLK_1	EP_SCK_GPIO_Port->PBSC = (uint32_t)EP_SCK_Pin

#define EPD_W21_CS_0	EPD_W21_CS_Port->PBC = (uint32_t)EP_CS_Pin
#define EPD_W21_CS_1	EPD_W21_CS_Port->PBSC = (uint32_t)EP_CS_Pin

#define EPD_W21_DC_0	EPD_W21_DC_Port->PBC = (uint32_t)EP_DC_Pin
#define EPD_W21_DC_1	EPD_W21_DC_Port->PBSC = (uint32_t)EP_DC_Pin

#define EPD_W21_RST_0	EPD_W21_RST_Port->PBC = (uint32_t)EP_REST_Pin
#define EPD_W21_RST_1	EPD_W21_RST_Port->PBSC = (uint32_t)EP_REST_Pin

#define isEPD_W21_BUSY GPIO_ReadInputDataBit(EP_BUSY_GPIO_Port, EP_BUSY_Pin) // for solomen solutions

3、声明spi IO驱动初始化

void EPD_GPIO_Init(void)
{
  GPIO_InitType GPIO_InitStructure;

  RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_GPIOB, ENABLE);

    /* Configure the GPIO pin */
	GPIO_InitStruct(&GPIO_InitStructure);
	GPIO_InitStructure.Pin = EP_MOSI_Pin | EP_SCK_Pin | EP_CS_Pin | EP_DC_Pin | EP_REST_Pin;
	GPIO_InitStructure.GPIO_Mode = GPIO_MODE_OUTPUT_PP;
	GPIO_InitPeripheral(EP_MOSI_GPIO_Port, &GPIO_InitStructure);
	
	GPIO_InitStructure.Pin = EP_BUSY_Pin;
	GPIO_InitStructure.GPIO_Mode = GPIO_MODE_INPUT;
	GPIO_InitPeripheral(EP_BUSY_GPIO_Port, &GPIO_InitStructure);
	
}

4、写代码：

void SPI_Write(unsigned char value)
{
    unsigned char i;

    for(i=0; i<8; i++)
    {
        EPD_W21_CLK_0;
        if(value & 0x80)
        	EPD_W21_MOSI_1;
        else
        	EPD_W21_MOSI_0;
        value = (value << 1);
        EPD_W21_CLK_1;
    }
}

void EPD_W21_WriteCMD(unsigned char command)
{
  EPD_W21_CS_0;
  EPD_W21_DC_0;		// command write
  SPI_Write(command);
  EPD_W21_CS_1;
}
void EPD_W21_WriteDATA(unsigned char data)
{
  EPD_W21_CS_0;
  EPD_W21_DC_1;		// data write
  SPI_Write(data);
  EPD_W21_CS_1;
}

其余main.c：

#include "fonts.h"
#include "GUI_Paint.h"
#include "Ap_29demo.h"
#include "Display_EPD_w21.h"

unsigned char BlackImage[4736];//Define canvas space

int main(void)
{
	 unsigned char fen_L,fen_H,miao_L,miao_H;
	  log_init();
    LedInit(LED1_PORT, LED1_PIN);
    LedInit(LED2_PORT, LED2_PIN);
    

    LedOn(LED1_PORT, LED1_PIN);
    LedOn(LED2_PORT, LED2_PIN);
		KeyInputExtiInit(KEY_INPUT_PORT, KEY_INPUT_PIN);

		EPD_GPIO_Init();       //EPD GPIO  initialization

		Paint_NewImage(BlackImage, 128, 296, 270, WHITE); //Set screen size and display orientation
		Paint_SelectImage(BlackImage);//Set the virtual canvas data storage location

    while (1)
    {
			  log_debug("debug\r\n");
        LedBlink(LED1_PORT, LED1_PIN);
        Delay(0x28FFFF);
			  log_info("LED FLASH\r\n");
			 //////////////////////Partial refresh time demo/////////////////////////////////////
	      EPD_HW_Init(); //Electronic paper initialization
	  	  EPD_SetRAMValue_BaseMap(gImage_basemap); //Partial refresh background color
	  		for(fen_H=0;fen_H<6;fen_H++)
	  		{
	  		for(fen_L=0;fen_L<10;fen_L++)
	  		{
	  			for(miao_H=0;miao_H<6;miao_H++)
	  			{
	  				for(miao_L=0;miao_L<10;miao_L++)
	  					{
	  							EPD_Dis_Part_myself(48,90,(unsigned char *)&Num[miao_L],         //x-A,y-A,DATA-A
	  																	48,122,(unsigned char *)&Num[miao_H],         //x-B,y-B,DATA-B
	  																	48,162,(unsigned char *)gImage_numdot,       //x-C,y-C,DATA-C
	  																	48,204,(unsigned char *)&Num[fen_L],         //x-D,y-D,DATA-D
	  																	48,236,(unsigned char *)&Num[fen_H],32,64);	 //x-E,y-E,DATA-E,Resolution 32*64

	  																	if((fen_L==5)&&(miao_H==0)&&(miao_L==9))
	  																	goto Clear;
	  						}
	  			}
	  		}

	  		}
					  			//Clear screen
	  		Clear:
	  		EPD_HW_Init(); //Electronic paper initialization
	  		EPD_WhiteScreen_White(); //Show all white
	  		EPD_DeepSleep(); //Enter deep sleep,Sleep instruction is necessary, please do not delete!!!

    }
}

【效果】见视频：

驱动墨水屏