4.0寸86盒显示屏调试（三）
读取了个把星期也没读取出正确的ID号，最终放弃了读取，考虑是不是液晶屏根本没有输出功能。在使用SPI驱动以后，也没有显示白屏或者任何可以让人感觉驱动正确的现象。最终也放弃了在SPI上搞出个现象。转而使用RGB协议直驱，但还是没有结果，最后还是使用SPI初始化后，再使用RGB驱动一次，发现有一次闪屏。于是乎有以下结论：SPI驱动时序没有错，屏不能读取数据。
SPI的驱动函数段：
SPI相关头文件定义：
/* DCX ~ PD4 */ //--SDO
/* SDA ~ PD5 */
/* SCL ~ PD6 */
/* CSB ~ PD7 */
/* RESET ~ PD8 */
#define Lcd_DCX_Out(x) {x? GPIO_SetBits(GPIOD, GPIO_Pin_4):GPIO_ResetBits(GPIOD, GPIO_Pin_4);} //DCX数据命令线
#define Lcd_SDA_Out(x) {x? GPIO_SetBits(GPIOD, GPIO_Pin_5):GPIO_ResetBits(GPIOD, GPIO_Pin_5);} //SPI数据线
#define Lcd_SCL_Out(x) {x? GPIO_SetBits(GPIOD, GPIO_Pin_6):GPIO_ResetBits(GPIOD, GPIO_Pin_6);} //SPI时钟线
#define Lcd_CSB_Out(x) {x? GPIO_SetBits(GPIOD, GPIO_Pin_7):GPIO_ResetBits(GPIOD, GPIO_Pin_7);} //片选信号
#define Lcd_RST_Out(x) {x? GPIO_SetBits(GPIOD, GPIO_Pin_8):GPIO_ResetBits(GPIOD, GPIO_Pin_8);} //复位信号
#define Lcd_SDA_Read() GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_5)
SPI源文件定义：
//SPI_IO口初始化
void Lcd_Spi_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE);
/* DCX ~ PD4 */
/* SDA ~ PD5 */
/* SCL ~ PD6 */
/* CSB ~ PD7 */
/* RESET ~ PD8 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOD, &GPIO_InitStructure);
Lcd_DCX_Out(1);
Lcd_CSB_Out(1);
Lcd_SCL_Out(1);
Lcd_SDA_Out(1);
Lcd_RST_Out(1);
}
/****************************************************************/
void Lcd_Spi_Senddata(uint8_t dat)
{
uint8_t i;
for(i=0; i<8; i++)
{
Lcd_SCL_Out(0);
if(dat&0x80)
{
Lcd_SDA_Out(1);
}
else
{
Lcd_SDA_Out(0);
}
Lcd_SCL_Out(1);
dat <<= 1;
}
}
void Lcd_Spi_Writecmd(uint8_t cmd)
{
Lcd_CSB_Out(0);
Lcd_DCX_Out(0);
Lcd_Spi_Senddata(cmd);
Lcd_CSB_Out(1);
}
/***************************************************************/
void Lcd_Spi_Writedata(uint8_t data)
{
Lcd_CSB_Out(0);
Lcd_DCX_Out(1);
Lcd_Spi_Senddata(data);
Lcd_CSB_Out(1);
}
/**********************LCD***************************/
void Lcd_Spi_Init(void)
{
Lcd_Reset();
//***************************************************************//LCD SETING
Lcd_Spi_Writecmd(0x11);
delay_ms(120);
//PAGE0 1
Lcd_Spi_Writecmd(0xFF);
Lcd_Spi_Writedata(0x77);
Lcd_Spi_Writedata(0x01);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0x10);
Lcd_Spi_Writecmd(0xC0);//Display Line Setting
Lcd_Spi_Writedata(0x3B);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writecmd(0xC1);//Porch Control
Lcd_Spi_Writedata(0x0D);
Lcd_Spi_Writedata(0x02);
Lcd_Spi_Writecmd(0xC2);// Inversion set
Lcd_Spi_Writedata(0x37);//31 2-DOT 37-Column
Lcd_Spi_Writedata(0x05);
Lcd_Spi_Writecmd(0xC3); //SET RGB MODE
Lcd_Spi_Writedata(0x02); //00-DE MODE ,80-HV MODE PCLK N
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writecmd(0xB0);
Lcd_Spi_Writedata(0x00); //Positive Voltage Gamma Control
Lcd_Spi_Writedata(0x11);
Lcd_Spi_Writedata(0x18);
Lcd_Spi_Writedata(0x0E);
Lcd_Spi_Writedata(0x11);
Lcd_Spi_Writedata(0x06);
Lcd_Spi_Writedata(0x07);
Lcd_Spi_Writedata(0x08);
Lcd_Spi_Writedata(0x07);
Lcd_Spi_Writedata(0x22);
Lcd_Spi_Writedata(0x04);
Lcd_Spi_Writedata(0x12);
Lcd_Spi_Writedata(0x0F);
Lcd_Spi_Writedata(0xAA);
Lcd_Spi_Writedata(0x31);
Lcd_Spi_Writedata(0x18);
Lcd_Spi_Writecmd(0xB1);
Lcd_Spi_Writedata(0x00); //Negative Voltage Gamma Control
Lcd_Spi_Writedata(0x11);
Lcd_Spi_Writedata(0x19);
Lcd_Spi_Writedata(0x0E);
Lcd_Spi_Writedata(0x12);
Lcd_Spi_Writedata(0x07);
Lcd_Spi_Writedata(0x08);
Lcd_Spi_Writedata(0x08);
Lcd_Spi_Writedata(0x08);
Lcd_Spi_Writedata(0x22);
Lcd_Spi_Writedata(0x04);
Lcd_Spi_Writedata(0x11);
Lcd_Spi_Writedata(0x11);
Lcd_Spi_Writedata(0xA9);
Lcd_Spi_Writedata(0x32);
Lcd_Spi_Writedata(0x18);
//*******power set********//
//PAGE2
Lcd_Spi_Writecmd(0xFF);
Lcd_Spi_Writedata(0x77);
Lcd_Spi_Writedata(0x01);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0x11);
Lcd_Spi_Writecmd(0xB0);//Vop Amplitude setting
Lcd_Spi_Writedata(0x60); //Vop=4.7375v
Lcd_Spi_Writecmd(0xB1); //VCOM amplitude setting
Lcd_Spi_Writedata(0x26); //VCOM=32
Lcd_Spi_Writecmd(0xB2); //VGH Voltage setting
Lcd_Spi_Writedata(0x07); //VGH=15v
Lcd_Spi_Writecmd(0xB3); //TEST Command Setting
Lcd_Spi_Writedata(0x80);
Lcd_Spi_Writecmd(0xB5); //VGL Voltage setting
Lcd_Spi_Writedata(0x49); //VGL=-10.17v
Lcd_Spi_Writecmd(0xB7);//Power Control 1
Lcd_Spi_Writedata(0x85);
Lcd_Spi_Writecmd(0xB8); //Power Control 2
Lcd_Spi_Writedata(0x21); //AVDD=6.6 & AVCL=-4.6
Lcd_Spi_Writecmd(0xC1);//Source pre_drive timing set1
Lcd_Spi_Writedata(0x78);
Lcd_Spi_Writecmd(0xC2);//Source EQ2 Setting
Lcd_Spi_Writedata(0x78);
//*********GIP SET*************//
Lcd_Spi_Writecmd(0xE0);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0x1B);
Lcd_Spi_Writedata(0x02);
Lcd_Spi_Writecmd(0xE1);
Lcd_Spi_Writedata(0x08);
Lcd_Spi_Writedata(0xA0);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0x07);
Lcd_Spi_Writedata(0xA0);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0x44);
Lcd_Spi_Writedata(0x44);
Lcd_Spi_Writecmd(0xE2);
Lcd_Spi_Writedata(0x11);
Lcd_Spi_Writedata(0x11);
Lcd_Spi_Writedata(0x44);
Lcd_Spi_Writedata(0x44);
Lcd_Spi_Writedata(0xED);
Lcd_Spi_Writedata(0xA0);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0xEC);
Lcd_Spi_Writedata(0xA0);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writecmd(0xE3);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0x11);
Lcd_Spi_Writedata(0x11);
Lcd_Spi_Writecmd(0xE4);
Lcd_Spi_Writedata(0x44);
Lcd_Spi_Writedata(0x44);
Lcd_Spi_Writecmd(0xE5);
Lcd_Spi_Writedata(0x0A);
Lcd_Spi_Writedata(0xE9);
Lcd_Spi_Writedata(0xD8);
Lcd_Spi_Writedata(0xA0);
Lcd_Spi_Writedata(0x0C);
Lcd_Spi_Writedata(0xEB);
Lcd_Spi_Writedata(0xD8);
Lcd_Spi_Writedata(0xA0);
Lcd_Spi_Writedata(0x0E);
Lcd_Spi_Writedata(0xED);
Lcd_Spi_Writedata(0xD8);
Lcd_Spi_Writedata(0xA0);
Lcd_Spi_Writedata(0x10);
Lcd_Spi_Writedata(0xEF);
Lcd_Spi_Writedata(0xD8);
Lcd_Spi_Writedata(0xA0);
Lcd_Spi_Writecmd(0xE6);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0x11);
Lcd_Spi_Writedata(0x11);
Lcd_Spi_Writecmd(0xE7);
Lcd_Spi_Writedata(0x44);
Lcd_Spi_Writedata(0x44);
Lcd_Spi_Writecmd(0xE8);
Lcd_Spi_Writedata(0x09);
Lcd_Spi_Writedata(0xE8);
Lcd_Spi_Writedata(0xD8);
Lcd_Spi_Writedata(0xA0);
Lcd_Spi_Writedata(0x0B);
Lcd_Spi_Writedata(0xEA);
Lcd_Spi_Writedata(0xD8);
Lcd_Spi_Writedata(0xA0);
Lcd_Spi_Writedata(0x0D);
Lcd_Spi_Writedata(0xEC);
Lcd_Spi_Writedata(0xD8);
Lcd_Spi_Writedata(0xA0);
Lcd_Spi_Writedata(0x0F);
Lcd_Spi_Writedata(0xEE);
Lcd_Spi_Writedata(0xD8);
Lcd_Spi_Writedata(0xA0);
Lcd_Spi_Writecmd(0xEB);
Lcd_Spi_Writedata(0x02);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0xE4);
Lcd_Spi_Writedata(0xE4);
Lcd_Spi_Writedata(0x88);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0x40);
Lcd_Spi_Writecmd(0xEC);
Lcd_Spi_Writedata(0x3C);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writecmd(0xED);
Lcd_Spi_Writedata(0xAB);
Lcd_Spi_Writedata(0x89);
Lcd_Spi_Writedata(0x76);
Lcd_Spi_Writedata(0x54);
Lcd_Spi_Writedata(0x02);
Lcd_Spi_Writedata(0xFF);
Lcd_Spi_Writedata(0xFF);
Lcd_Spi_Writedata(0xFF);
Lcd_Spi_Writedata(0xFF);
Lcd_Spi_Writedata(0xFF);
Lcd_Spi_Writedata(0xFF);
Lcd_Spi_Writedata(0x20);
Lcd_Spi_Writedata(0x45);
Lcd_Spi_Writedata(0x67);
Lcd_Spi_Writedata(0x98);
Lcd_Spi_Writedata(0xBA);
//-----------VAP & VAN---------------
Lcd_Spi_Writecmd(0xFF);
Lcd_Spi_Writedata(0x77);
Lcd_Spi_Writedata(0x01);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0x13);
Lcd_Spi_Writecmd(0xE5);
Lcd_Spi_Writedata(0xE4);
Lcd_Spi_Writecmd(0xFF);//page
Lcd_Spi_Writedata(0x77);
Lcd_Spi_Writedata(0x01);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writedata(0x00);
Lcd_Spi_Writecmd(0x36);
Lcd_Spi_Writedata(0x00); //10-180
Lcd_Spi_Writecmd(0x3A);
Lcd_Spi_Writedata(0x70); //RGB888 24bit
//Display on
Lcd_Spi_Writecmd(0x29);
delay_ms(25);
}
使用以上函数，可以初始化屏幕，但屏幕并不会有任何显示。这点和之前的MCU接口的TFT、LCD不一样。也不知道其他RGB屏是不是也是这个样。
下面需要使用RGB的数据协议，但ST7701S的手册上关于RGB的时序只有以下：
以上是DE模式的时序图，但除了时序图基本上就没有啥了，按照这个时序图，简单的写了一个时序。
时序是错误的，除了能闪一下屏就没啥现象了，所以暂时不贴代码了。下一章调试出结果后继续。