[复旦微FM33LG0系列开发板测评] 驱动SPI TFT显示
<p> 看到淘宝有个9.9元的LCD SPI屏，拍下。买来发现是ST7735芯片控制的，一般淘宝里卖的比较多的基本是12864或者是由ILI93XX驱动的，用ST7735的比较少，所以我想写一篇关于ST7735的博文。在驱动屏幕之前我们需要看看它的产品手册。st7735有两种驱动方式，其中一种SPI通讯，另外一个是总线驱动。由于我买的液晶屏是SPI通讯的，所以我只讨论spi驱动。手册上有两个SPI通讯的时序图，分别是SPI三线和SPI四线。其实本质都是一样，只是三线SPI比四线SPI少了一个数据命令切换的控制。</p><p> </p>
<p> </p>
<p></p>
<p>SPI7735SPI三线时序图</p>
<p>ST7735SPI四线时序图：</p>
<p></p>
<p> </p>
<p> 做驱动程序。移植一下午。搞定。</p>
<p> </p>
<p> </p>
<p>驱动函数：</p>
<pre>
<code>#include "lcd_init.h"
//#include "delay.h"
void LCD_GPIO_Init(void)
{
// GPIO_InitTypeDefGPIO_InitStructure;
// RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能A端口时钟
// GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5;
// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出
// GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//速度50MHz
// GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化GPIOA
// GPIO_SetBits(GPIOA,GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5);
FL_GPIO_InitTypeDef GPIO_InitStruct = {0};
FL_GPIO_ResetOutputPin(GPIOA, FL_GPIO_PIN_0|FL_GPIO_PIN_1|FL_GPIO_PIN_2|FL_GPIO_PIN_3|FL_GPIO_PIN_4|FL_GPIO_PIN_5);
GPIO_InitStruct.pin = FL_GPIO_PIN_0|FL_GPIO_PIN_1|FL_GPIO_PIN_2|FL_GPIO_PIN_3|FL_GPIO_PIN_4|FL_GPIO_PIN_5;
GPIO_InitStruct.mode = FL_GPIO_MODE_OUTPUT;
GPIO_InitStruct.outputType = FL_GPIO_OUTPUT_PUSHPULL;
GPIO_InitStruct.pull = FL_DISABLE;
FL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}
/******************************************************************************
函数说明：LCD串行数据写入函数
入口数据：dat要写入的串行数据
返回值：无
******************************************************************************/
void LCD_Writ_Bus(unsigned char dat)
{
unsigned char i;
LCD_CS_Clr();
for(i=0;i<8;i++)
{
LCD_SCLK_Clr();
if(dat&0x80)
{
LCD_MOSI_Set();
}
else
{
LCD_MOSI_Clr();
}
LCD_SCLK_Set();
dat<<=1;
}
LCD_CS_Set();
}
/******************************************************************************
函数说明：LCD写入数据
入口数据：dat 写入的数据
返回值：无
******************************************************************************/
void LCD_WR_DATA8(unsigned char dat)
{
LCD_Writ_Bus(dat);
}
/******************************************************************************
函数说明：LCD写入数据
入口数据：dat 写入的数据
返回值：无
******************************************************************************/
void LCD_WR_DATA(unsigned short dat)
{
LCD_Writ_Bus(dat>>8);
LCD_Writ_Bus(dat);
}
/******************************************************************************
函数说明：LCD写入命令
入口数据：dat 写入的命令
返回值：无
******************************************************************************/
void LCD_WR_REG(unsigned char dat)
{
LCD_DC_Clr();//写命令
LCD_Writ_Bus(dat);
LCD_DC_Set();//写数据
}
/******************************************************************************
函数说明：设置起始和结束地址
入口数据：x1,x2 设置列的起始和结束地址
y1,y2 设置行的起始和结束地址
返回值：无
******************************************************************************/
void LCD_Address_Set(unsigned short x1,unsigned short y1,unsigned short x2,unsigned short y2)
{
if(USE_HORIZONTAL==0)
{
LCD_WR_REG(0x2a);//列地址设置
LCD_WR_DATA(x1+2);
LCD_WR_DATA(x2+2);
LCD_WR_REG(0x2b);//行地址设置
LCD_WR_DATA(y1+1);
LCD_WR_DATA(y2+1);
LCD_WR_REG(0x2c);//储存器写
}
else if(USE_HORIZONTAL==1)
{
LCD_WR_REG(0x2a);//列地址设置
LCD_WR_DATA(x1+2);
LCD_WR_DATA(x2+2);
LCD_WR_REG(0x2b);//行地址设置
LCD_WR_DATA(y1+1);
LCD_WR_DATA(y2+1);
LCD_WR_REG(0x2c);//储存器写
}
else if(USE_HORIZONTAL==2)
{
LCD_WR_REG(0x2a);//列地址设置
LCD_WR_DATA(x1+1);
LCD_WR_DATA(x2+1);
LCD_WR_REG(0x2b);//行地址设置
LCD_WR_DATA(y1+2);
LCD_WR_DATA(y2+2);
LCD_WR_REG(0x2c);//储存器写
}
else
{
LCD_WR_REG(0x2a);//列地址设置
LCD_WR_DATA(x1+1);
LCD_WR_DATA(x2+1);
LCD_WR_REG(0x2b);//行地址设置
LCD_WR_DATA(y1+2);
LCD_WR_DATA(y2+2);
LCD_WR_REG(0x2c);//储存器写
}
}
void LCD_Init(void)
{
LCD_GPIO_Init();//初始化GPIO
LCD_RES_Clr();//复位
FL_DelayMs(100);
LCD_RES_Set();
FL_DelayMs(100);
LCD_BLK_Set();//打开背光
FL_DelayMs(100);
//************* Start Initial Sequence **********//
LCD_WR_REG(0x11); //Sleep out
FL_DelayMs(120); //Delay 120ms
//------------------------------------ST7735S Frame Rate-----------------------------------------//
LCD_WR_REG(0xB1);
LCD_WR_DATA8(0x05);
LCD_WR_DATA8(0x3C);
LCD_WR_DATA8(0x3C);
LCD_WR_REG(0xB2);
LCD_WR_DATA8(0x05);
LCD_WR_DATA8(0x3C);
LCD_WR_DATA8(0x3C);
LCD_WR_REG(0xB3);
LCD_WR_DATA8(0x05);
LCD_WR_DATA8(0x3C);
LCD_WR_DATA8(0x3C);
LCD_WR_DATA8(0x05);
LCD_WR_DATA8(0x3C);
LCD_WR_DATA8(0x3C);
//------------------------------------End ST7735S Frame Rate---------------------------------//
LCD_WR_REG(0xB4); //Dot inversion
LCD_WR_DATA8(0x03);
//------------------------------------ST7735S Power Sequence---------------------------------//
LCD_WR_REG(0xC0);
LCD_WR_DATA8(0x28);
LCD_WR_DATA8(0x08);
LCD_WR_DATA8(0x04);
LCD_WR_REG(0xC1);
LCD_WR_DATA8(0XC0);
LCD_WR_REG(0xC2);
LCD_WR_DATA8(0x0D);
LCD_WR_DATA8(0x00);
LCD_WR_REG(0xC3);
LCD_WR_DATA8(0x8D);
LCD_WR_DATA8(0x2A);
LCD_WR_REG(0xC4);
LCD_WR_DATA8(0x8D);
LCD_WR_DATA8(0xEE);
//---------------------------------End ST7735S Power Sequence-------------------------------------//
LCD_WR_REG(0xC5); //VCOM
LCD_WR_DATA8(0x1A);
LCD_WR_REG(0x36); //MX, MY, RGB mode
if(USE_HORIZONTAL==0)LCD_WR_DATA8(0x00);
else if(USE_HORIZONTAL==1)LCD_WR_DATA8(0xC0);
else if(USE_HORIZONTAL==2)LCD_WR_DATA8(0x70);
else LCD_WR_DATA8(0xA0);
//------------------------------------ST7735S Gamma Sequence---------------------------------//
LCD_WR_REG(0xE0);
LCD_WR_DATA8(0x04);
LCD_WR_DATA8(0x22);
LCD_WR_DATA8(0x07);
LCD_WR_DATA8(0x0A);
LCD_WR_DATA8(0x2E);
LCD_WR_DATA8(0x30);
LCD_WR_DATA8(0x25);
LCD_WR_DATA8(0x2A);
LCD_WR_DATA8(0x28);
LCD_WR_DATA8(0x26);
LCD_WR_DATA8(0x2E);
LCD_WR_DATA8(0x3A);
LCD_WR_DATA8(0x00);
LCD_WR_DATA8(0x01);
LCD_WR_DATA8(0x03);
LCD_WR_DATA8(0x13);
LCD_WR_REG(0xE1);
LCD_WR_DATA8(0x04);
LCD_WR_DATA8(0x16);
LCD_WR_DATA8(0x06);
LCD_WR_DATA8(0x0D);
LCD_WR_DATA8(0x2D);
LCD_WR_DATA8(0x26);
LCD_WR_DATA8(0x23);
LCD_WR_DATA8(0x27);
LCD_WR_DATA8(0x27);
LCD_WR_DATA8(0x25);
LCD_WR_DATA8(0x2D);
LCD_WR_DATA8(0x3B);
LCD_WR_DATA8(0x00);
LCD_WR_DATA8(0x01);
LCD_WR_DATA8(0x04);
LCD_WR_DATA8(0x13);
//------------------------------------End ST7735S Gamma Sequence-----------------------------//
LCD_WR_REG(0x3A); //65k mode
LCD_WR_DATA8(0x05);
LCD_WR_REG(0x29); //Display on
}
</code></pre>
<p>main</p>
<pre>
<code>#include "main.h"
#include "user_init.h"
#include "lcd_init.h"
#include "lcd.h"
int main(void)
{
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
/* SHOULD BE KEPT!!! */
MF_Clock_Init();
/* Configure the system clock */
/* SHOULD BE KEPT!!! */
MF_SystemClock_Config();
/* Initialize FL Driver Library */
/* SHOULD BE KEPT!!! */
FL_Init();
/* Initialize all configured peripherals */
/* SHOULD BE KEPT!!! */
MF_Config_Init();
UserInit();
LCD_Init();//LCD初始化
LCD_Fill(0,0,LCD_W,LCD_H,BLUE);
FL_DelayMs(100);
LCD_ShowString(18,30,"Fudan",WHITE,BLUE,32,0);
LCD_ShowString(5,90,"FM33LG0",WHITE,BLUE,32,0);
FL_DelayMs(10);
while(1)
{
LED0_TOG();
// printf("祝福复旦微电子越办越好!\r\n");
FL_DelayMs(1000);
}
}</code></pre>
<p></p>
<p></p>
<p> </p>
<p>有显示屏玩起来就是方便，看完你的帖子我也买了几个彩屏。</p>
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