本次使用的是2.2寸的TFT SPI LCD屏！
板上引脚图
引脚定义
uint8_t LCD_LED; //PA.7—->>TFT —BL
uint8_t LCD_RS; //PF.1—->>TFT —RS/DC
uint8_t LCD_CS; //PA.0—->>TFT —CS/CE
uint8_t LCD_RST; //PA.5—>>TFT —RST
uint8_t LCD_SCL; //PA.1—->>TFT —SCL/SCK
uint8_t LCD_SDA; //PF.0 MOSI—->>TFT —SDA/DIN
宏定义，LCD的像素大小，支持横竖屏
//屏幕物理像素设置
#define X_MAX_PIXEL LCD_Y_SIZE
#define Y_MAX_PIXEL LCD_X_SIZE
//支持横竖屏快速定义切换
#define USE_HORIZONTAL 1 //定义是否使用横屏 0,不使用.1,使用.
#ifdef USE_HORIZONTAL//如果定义了横屏
#define X_MAX_PIXEL LCD_Y_SIZE
#define Y_MAX_PIXEL LCD_X_SIZE
#else
#define X_MAX_PIXEL LCD_X_SIZE
#define Y_MAX_PIXEL LCD_Y_SIZE
#endif
#define RED 0xf800
#define GREEN 0x07e0
#define BLUE 0x001f
#define WHITE 0xffff
#define BLACK 0x0000
#define YELLOW 0xFFE0
#define GRAY0 0xEF7D //灰色0 3165 00110 001011 00101
#define GRAY1 0x8410 //灰色1 00000 000000 00000
#define GRAY2 0x4208 //灰色2 1111111111011111
void LCD_GPIO_Init(void){
LCD_LED = rt_pin_get("PA.7"); //PA.7--->>TFT --BL
LCD_RS = rt_pin_get("PF.1"); //PF.1--->>TFT --RS/DC
LCD_CS = rt_pin_get("PA.0"); //PA.0--->>TFT --CS/CE
LCD_RST = rt_pin_get("PA.5"); //PA.5-->>TFT --RST
LCD_SCL = rt_pin_get("PA.1"); //PA.1--->>TFT --SCL/SCK
LCD_SDA = rt_pin_get("PF.0"); //PF.0 MOSI--->>TFT --SDA/DIN
rt_pin_mode(LCD_LED, PIN_MODE_OUTPUT);
rt_pin_mode(LCD_RS, PIN_MODE_OUTPUT);
rt_pin_mode(LCD_CS, PIN_MODE_OUTPUT);
rt_pin_mode(LCD_RST, PIN_MODE_OUTPUT);
rt_pin_mode(LCD_SCL, PIN_MODE_OUTPUT);
rt_pin_mode(LCD_SDA, PIN_MODE_OUTPUT);
}
软件模拟SPI的写数据的实现
void SPI_WriteData(uint8_t Data)
{
uint8_t i=0;
for(i=8;i>0;i--)
{
if(Data&0x80){
LCD_SDA_SET; //输出数据
}
else{
LCD_SDA_CLR;
}
LCD_SCL_CLR;
Data<<=1;
LCD_SCL_SET;
}
}
/****************************************************************************
名 称：Lcd_WriteIndex(uint8_t Index)
功 能：向液晶屏写一个8位指令
入口参数：Index 寄存器地址
出口参数：无
说 明：调用前需先选中控制器，内部函数
/
void Lcd_WriteIndex(uint8_t Index)
{
LCD_CS_CLR;
LCD_RS_CLR;
SPI_WriteData(Index);
LCD_CS_SET;
}
/
名 称：Lcd_WriteData(uint8_t Data)
功 能：向液晶屏写一个8位数据
入口参数：dat 寄存器数据
出口参数：无
说 明：向控制器指定地址写入数据，内部函数
/
void Lcd_WriteData(uint8_t Data)
{
LCD_CS_CLR;
LCD_RS_SET;
SPI_WriteData(Data);
LCD_CS_SET;
}
/
名 称：void LCD_WriteReg(uint8_t Index,uint16_t Data)
功 能：写寄存器数据
入口参数：Index,Data
出口参数：无
说 明：本函数为组合函数，向Index地址的寄存器写入Data值
/
void LCD_WriteReg(uint8_t Index,uint16_t Data)
{
Lcd_WriteIndex(Index);
Lcd_WriteData_16Bit(Data);
}
/
名 称：void Lcd_WriteData_16Bit(uint16_t Data)
功 能：向液晶屏写一个16位数据
入口参数：Data
出口参数：无
说 明：向控制器指定地址写入一个16位数据
/
void Lcd_WriteData_16Bit(uint16_t Data)
{
Lcd_WriteData(Data>>8);
Lcd_WriteData(Data);
}
/
名 称：void Lcd_Reset(void)
功 能：液晶硬复位函数
入口参数：无
出口参数：无
说 明：液晶初始化前需执行一次复位操作
/
void Lcd_Reset(void)
{
LCD_RST_CLR;
rt_thread_mdelay(100);
LCD_RST_SET;
rt_thread_mdelay(50);
}
/
名 称：void Lcd_Init(void)
功 能：液晶初始化函数
入口参数：无
出口参数：无
说 明：液晶初始化_ILI9225_176X220
***************************/
void Lcd_Init(void)
{
LCD_GPIO_Init();//使用模拟SPI
Lcd_Reset(); //Reset before LCD Init.
Lcd_WriteIndex(0xCB);
Lcd_WriteData(0x39);
Lcd_WriteData(0x2C);
Lcd_WriteData(0x00);
Lcd_WriteData(0x34);
Lcd_WriteData(0x02);
Lcd_WriteIndex(0xCF);
Lcd_WriteData(0x00);
Lcd_WriteData(0XC1);
Lcd_WriteData(0X30);
Lcd_WriteIndex(0xE8);
Lcd_WriteData(0x85);
Lcd_WriteData(0x00);
Lcd_WriteData(0x78);
Lcd_WriteIndex(0xEA);
Lcd_WriteData(0x00);
Lcd_WriteData(0x00);
Lcd_WriteIndex(0xED);
Lcd_WriteData(0x64);
Lcd_WriteData(0x03);
Lcd_WriteData(0X12);
Lcd_WriteData(0X81);
Lcd_WriteIndex(0xF7);
Lcd_WriteData(0x20);
Lcd_WriteIndex(0xC0); //Power control
Lcd_WriteData(0x23); //VRH[5:0]
Lcd_WriteIndex(0xC1); //Power control
Lcd_WriteData(0x10); //SAP[2:0];BT[3:0]
Lcd_WriteIndex(0xC5); //VCM control
Lcd_WriteData(0x3e); //对比度调节
Lcd_WriteData(0x28);
Lcd_WriteIndex(0xC7); //VCM control2
Lcd_WriteData(0x86); //--
Lcd_WriteIndex(0x36); // Memory Access Control
#ifdef USE_HORIZONTAL
Lcd_WriteData(0xE8); //C8 //48 68竖屏//28 E8 横屏
#else
Lcd_WriteData(0x48);
#endif
Lcd_WriteIndex(0x3A);
Lcd_WriteData(0x55);
Lcd_WriteIndex(0xB1);
Lcd_WriteData(0x00);
Lcd_WriteData(0x18);
Lcd_WriteIndex(0xB6); // Display Function Control
Lcd_WriteData(0x08);
Lcd_WriteData(0x82);
Lcd_WriteData(0x27);
Lcd_WriteIndex(0xF2); // 3Gamma Function Disable
Lcd_WriteData(0x00);
Lcd_WriteIndex(0x26); //Gamma curve selected
Lcd_WriteData(0x01);
Lcd_WriteIndex(0xE0); //Set Gamma
Lcd_WriteData(0x0F);
Lcd_WriteData(0x31);
Lcd_WriteData(0x2B);
Lcd_WriteData(0x0C);
Lcd_WriteData(0x0E);
Lcd_WriteData(0x08);
Lcd_WriteData(0x4E);
Lcd_WriteData(0xF1);
Lcd_WriteData(0x37);
Lcd_WriteData(0x07);
Lcd_WriteData(0x10);
Lcd_WriteData(0x03);
Lcd_WriteData(0x0E);
Lcd_WriteData(0x09);
Lcd_WriteData(0x00);
Lcd_WriteIndex(0XE1); //Set Gamma
Lcd_WriteData(0x00);
Lcd_WriteData(0x0E);
Lcd_WriteData(0x14);
Lcd_WriteData(0x03);
Lcd_WriteData(0x11);
Lcd_WriteData(0x07);
Lcd_WriteData(0x31);
Lcd_WriteData(0xC1);
Lcd_WriteData(0x48);
Lcd_WriteData(0x08);
Lcd_WriteData(0x0F);
Lcd_WriteData(0x0C);
Lcd_WriteData(0x31);
Lcd_WriteData(0x36);
Lcd_WriteData(0x0F);
Lcd_WriteIndex(0x11); //Exit Sleep
rt_thread_mdelay(120);
Lcd_WriteIndex(0x29); //Display on
Lcd_WriteIndex(0x2c);
}
/
函数名：LCD_Set_XY
功能：设置lcd显示起始点
入口参数：xy坐标
返回值：无
/
void Lcd_SetXY(uint16_t Xpos, uint16_t Ypos)
{
Lcd_WriteIndex(0x2a);
Lcd_WriteData_16Bit(Xpos);
Lcd_WriteIndex(0x2b);
Lcd_WriteData_16Bit(Ypos);
Lcd_WriteIndex(0x2c);
}
/
函数名：LCD_Set_Region
功能：设置lcd显示区域，在此区域写点数据自动换行
入口参数：xy起点和终点
返回值：无
/
//设置显示窗口
void Lcd_SetRegion(uint16_t xStar, uint16_t yStar,uint16_t xEnd,uint16_t yEnd)
{
Lcd_WriteIndex(0x2a);
Lcd_WriteData_16Bit(xStar);
Lcd_WriteData_16Bit(xEnd);
Lcd_WriteIndex(0x2b);
Lcd_WriteData_16Bit(yStar);
Lcd_WriteData_16Bit(yEnd);
Lcd_WriteIndex(0x2c);
}
/
函数名：LCD_DrawPoint
功能：画一个点
入口参数：xy坐标和颜色数据
返回值：无
/
void Gui_DrawPoint(uint16_t x,uint16_t y,uint16_t Data)
{
Lcd_SetXY(x,y);
Lcd_WriteData_16Bit(Data);
}
/
函数名：Lcd_Clear
功能：全屏清屏函数
入口参数：填充颜色COLOR
返回值：无
*************************************************/
void Lcd_Clear(uint16_t Color)
{
unsigned int i,m;
Lcd_SetRegion(0,0,X_MAX_PIXEL-1,Y_MAX_PIXEL-1);
for(i=0;i<X_MAX_PIXEL;i++)
for(m=0;m<Y_MAX_PIXEL;m++)
{
Lcd_WriteData_16Bit(Color);
}
}
这次测试也是本着玩一下的心态去实现的，正巧手头上有TFT LCD屏，软件模拟的SPI通信速率还不怎样，屏幕刷新很慢。
原作者：ljhya
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