【经验】国产MCU CS32F030驱动彩色LCD显示屏YB-TG240320C325B-N-A0的硬软件设计

芯海科技CS32F030是一款32bit cortex-M0内核的国产MCU，YB-TG240320C325B-N-A0是亿都设计的基于驱动芯片ST7789V2的320x240彩色LCD显示屏，本文介绍CS32驱动液晶屏相关的硬件连接和软件驱动。

1.硬件连接：

连接采用SPI通信，除了基础的SPI接口，需要额外注意：

RESET引脚要连接，在初始化之前需要reset清除相关显示。

RS引脚非常重要，在配置和初始化时，需要采用命令的方式，在进行图案和字母传输的时候，需要采用数据的方式。

注意LCS_A的背光电压和电流，建议使用3.3V。

2.软件驱动

#define  FONT_W  32

#define  FONT_H  32

#define PIC_WIDTH    160 //预备向LCD显示区域填充的图片的大小

#define PIC_HEIGHT   160

#define RED    0xF800 //定义颜色常量 

#define GREEN  0x07E0

#define BLUE   0x001F

#define WHITE  0xFFFF

#define BLACK  0x0000

#define GRAY   0xEF5D      //0x2410

#define GRAY75 0x39E7 

#define GRAY50 0x7BEF

#define GRAY25 0xADB5

// LCD SPI2 GPIO config

gpio_mode_set(GPIOB, GPIO_PIN_10, GPIO_MODE_OUT_PP(GPIO_SPEED_HIGH));//CS

gpio_mode_set(GPIOB, GPIO_PIN_13, GPIO_MODE_OUT_PP(GPIO_SPEED_HIGH));//sclk

gpio_mode_set(GPIOB, GPIO_PIN_14, GPIO_MODE_OUT_PP(GPIO_SPEED_HIGH));//SPI_A0  WR/D

gpio_mode_set(GPIOB, GPIO_PIN_15, GPIO_MODE_OUT_PP(GPIO_SPEED_HIGH));//mosi

gpio_mode_set(GPIOA, GPIO_PIN_12, GPIO_MODE_OUT_PP(GPIO_SPEED_HIGH));//RESET

#define LCD_RST(n) (n ? __GPIO_PIN_SET(GPIOA, GPIO_PIN_12) : __GPIO_PIN_RESET(GPIOA, GPIO_PIN_12))

#define LCD_WR(n)  (n ? __GPIO_PIN_SET(GPIOB, GPIO_PIN_14) : __GPIO_PIN_RESET(GPIOB, GPIO_PIN_14))

#define LCD_CS(n)  (n ? __GPIO_PIN_SET(GPIOB, GPIO_PIN_10) : __GPIO_PIN_RESET(GPIOB, GPIO_PIN_10))

#define LCD_SDA(n) (n ? __GPIO_PIN_SET(GPIOB, GPIO_PIN_15) : __GPIO_PIN_RESET(GPIOB, GPIO_PIN_15))

#define LCD_SCK(n) (n ? __GPIO_PIN_SET(GPIOB, GPIO_PIN_13) : __GPIO_PIN_RESET(GPIOB, GPIO_PIN_13))

驱动初始化：

void  SendDataSPI(unsigned char dat)

{  

//__SPI_8BITS_DATA_SEND(SPI2, dat); 

#if 1

   unsigned char i;

for(i = 0; i < 8; i++)

{   

LCD_SCK(0);

if(dat & 0x80)

{

LCD_SDA(1);

// delay_us(1);

}

else 

{

LCD_SDA(0);

// delay_us(1);

}

LCD_SCK(1);

// delay_us(1);

dat <<= 1;   

}

#endif

}

void WriteComm(unsigned int i)

{

LCD_CS(0);

LCD_WR(0);

SendDataSPI(i);

LCD_CS(1);

}

void WriteData(unsigned int i)

{

LCD_CS(0);

LCD_WR(1);

SendDataSPI(i);

LCD_CS(0);

}

void WriteDispData(unsigned char DataH,unsigned char DataL)

{

//CS0=0;

SendDataSPI(DataH);

SendDataSPI(DataL);

//CS0=1;

}

void LCD_Init(void)

{

LCD_RST(1); 

delay_ms(200);

LCD_RST(0); 

delay_ms(300);

LCD_RST(1); 

delay_ms(200);

WriteComm(0x11);     

delay_ms(480);

//boe2.8ips+st7789v2

WriteComm(0x36);     

WriteData(0x00);   

WriteComm(0x3A);     

WriteData(0x55);   //

WriteComm(0xB2);     

WriteData(0x0C);   

WriteData(0x0C);   

WriteData(0x00);   

WriteData(0x33);   

WriteData(0x33);   

WriteComm(0xB7);     

WriteData(0x75);   //VGH=14.97V, VGL=-10.43V  

WriteComm(0xBB);     //VCOM  

WriteData(0x2B);   

WriteComm(0xC0);     

WriteData(0x2C);   

WriteComm(0xC2);     

WriteData(0x01);   

WriteComm(0xC3);     //GVDD  

WriteData(0x0B);   

WriteComm(0xC4);     

WriteData(0x20);   

WriteComm(0xC6);     

WriteData(0x0F);   

WriteComm(0xD0);     

WriteData(0xA4);   

WriteData(0xA1);   

WriteComm(0xE0);     

WriteData(0xD0);   

WriteData(0x01);   

WriteData(0x04);   

WriteData(0x09);   

WriteData(0x0B);   

WriteData(0x07);   

WriteData(0x2E);   

WriteData(0x44);   

WriteData(0x43);   

WriteData(0x0B);   

WriteData(0x16);   

WriteData(0x15);   

WriteData(0x17);   

WriteData(0x1D);   

WriteComm(0xE1);     

WriteData(0xD0);   

WriteData(0x01);   

WriteData(0x05);   

WriteData(0x0A);   

WriteData(0x0B);   

WriteData(0x08);   

WriteData(0x2F);   

WriteData(0x44);   

WriteData(0x41);   

WriteData(0x0A);   

WriteData(0x15);   

WriteData(0x14);   

WriteData(0x19);   

WriteData(0x1D);   

WriteComm(0x29);  

}

void ExitSLP(void)

{

//FOR OTM3225A

//Power On sequence

WriteComm(0x0010);WriteData(0x0080); // SAP, BT[3:0], AP, DSTB, SLP

WriteComm(0x0011);WriteData(0x0000); // DC1[2:0], DC0[2:0], VC[2:0]

WriteComm(0x0012);WriteData(0x0000); // VREG1OUT voltage

WriteComm(0x0013);WriteData(0x0000); // VDV[4:0] for VCOM amplitude

delay_ms(200);                          // Dis-charge capacitor power voltage

WriteComm(0x0010);WriteData(0x1490); // SAP, BT[3:0], AP, DSTB, SLP, STB

WriteComm(0x0011);WriteData(0x0227); // R11h=0x0221 at VCI=3.3V DC1[2:0], DC0[2:0], VC[2:0]

delay_ms(50);                           // Delay 50ms

WriteComm(0x0012);WriteData(0x009B); // External reference voltage =Vci;

delay_ms(50);                           // Delay 50ms

WriteComm(0x0013);WriteData(0x1800); // R13h=0x1200 when R12=009D VDV[4:0] for VCOM amplitude

WriteComm(0x0029);WriteData(0x0027); // R29h=0x000C when R12=009D VCM[5:0] for VCOMH

delay_ms(50);                           // Delay 50ms

WriteComm(0x0007);WriteData(0x0133); // 262K color and display ON

}

void DispColor(unsigned int color)

{

unsigned int i,j;

BlockWrite(0,COL-1,0,ROW-1);

LCD_CS(0);

LCD_WR(1);

for(i=0;i<ROW;i++)

{

    for(j=0;j<COL;j++)

{    SendDataSPI(color>>8);

SendDataSPI(color);}

}

LCD_CS(1);

}

在初始化完成之后，主函数调用驱动：

LCD_Init();

ExitSLP();

DispColor(WHITE);

然后就可以进行数据显示了。