使用8080并口协议驱动NT35510LCD显示屏
???本文记录如何使用8080协议驱动LCD显示屏，其中LCD显示屏驱动为NT35510芯片，正点原子的4.3寸显示屏，像素480X800，基于正点原子STM32精英板开发平台。
??想要驱动一个芯片，第一步便是阅读芯片手册，读协议时序图，读指令集。正点原子硬件资料里面给出了NT35510的芯片手册。
??可以看出，NT35510支持多种接口协议，IIC，MIPI，8080，由于显示屏很大，数据量大，采用串行传输方式显然很难满足快速刷屏的要求，因此采用并口传输的方式，一次性可以传输多位数据。我们翻到手册第26页。
??我们发现8080并口也支持多种方式，根据IM0,IM1,IM3不同的配置，可以分为8位并口，16位并口，24位并口三种方式。我们打开正点原子原理图资料，打开4.3寸显示屏资料(看左边)，明显可以看出使用的是16位并口方式。
??我们再继续看NT35510数据手册，根据图名可以知道这是一个写数据到寄存器的过程，从左边阴影区看，一个 写过程需要：
（1）拉低CS片选端；
（2）拉高RD读端；
（3）D/C端拉低代表传输CMD，即命令，拉高代表传输Data，即数据，对应LCD上面的RS端口。
（4）数据挂载在数据总线上。
（5）WR拉低。（这里采用先把数据准备好，在开始传输的方式）
（6）WR端来一个上升沿代表数据发送结束
??同样，对于读过程，结合下面两幅图来看，注意观察下面第一幅图中的Driver to MPU，需要
??根据上述时序，我们可以写出如下代码，代码工程基于eclipse。
/*
* i80.c
*
* Created on: 2022年4月12日
* Author: djz
*/
#include "i80.h"
#define CS PGout(12)
#define RS PGout(0)
#define WR PDout(5)
#define RD PDout(4)
#define CMD 0
#define DATA 1
/*
* 8080协议初始化
*/
/**
* @brief 将16根数据线设置为输出模式
* @param None
*
* @retval None
*/
void Data_SetOut(void) {
//将数据信号线设置为输出模式
GPIOE->CRL &= ~(0xF << 28);
GPIOE->CRL |= (u32) (0x03 << 28);
GPIOE->CRH &= ~(u32) (0xFFFFFFFF);
GPIOE->CRH |= (u32) (0x33333333);
GPIOD->CRL &= ~(0x000000FF);
GPIOD->CRL |= (u32) (0x00000033);
GPIOD->CRH &= ~(u32) (0xFF000FFF);
GPIOD->CRH |= (u32) (0X33000333);
}
/**
* @brief 将16根数据线设置为输入模式
* @param None
*
* @retval None
*/
void Data_SetIn(void) {
//将数据信号线设置为输入模式
GPIOE->CRL &= ~(0xF << 28);
GPIOE->CRL |= (u32) (0x08 << 28);
GPIOE->CRH &= ~(u32) (0xFFFFFFFF);
GPIOE->CRH |= (u32) (0x88888888);
GPIOD->CRL &= ~(u32) (0x000000FF);
GPIOD->CRL |= (u32) (0x00000088);
GPIOD->CRH &= ~(u32) (0xFF000FFF);
GPIOD->CRH |= (u32) (0x88000888);
}
/**
* @brief 将数据挂载在16根数据线上
* @param None
*
* @retval None
*/
void Send_Data(u16 data) {
PDout(10) = (data >> 15) & (0x01);
PDout(9) = (data >> 14) & (0x01);
PDout(8) = (data >> 13) & (0x01);
PEout(15) = (data >> 12) & (0x01);
PEout(14) = (data >> 11) & (0x01);
PEout(13) = (data >> 10) & (0x01);
PEout(12) = (data >> 9) & (0x01);
PEout(11) = (data >> 8) & (0x01);
PEout(10) = (data >> 7) & (0x01);
PEout(9) = (data >> 6) & (0x01);
PEout(8) = (data >> 5) & (0x01);
PEout(7) = (data >> 4) & (0x01);
PDout(1) = (data >> 3) & (0x01);
PDout(0) = (data >> 2) & (0x01);
PDout(15) = (data >> 1) & (0x01);
PDout(14) = (data >> 0) & (0x01);
}
/**
* @brief 将数据从16根数据线上读出来
* @param None
*
* @retval None
*/
u16 Read_Data(void) {
u16 data = 0;
data |= PDin(10) << 15;
data |= PDin(9) << 14;
data |= PDin(8) << 13;
data |= PEin(15) << 12;
data |= PEin(14) << 11;
data |= PEin(13) << 10;
data |= PEin(12) << 9;
data |= PEin(11) << 8;
data |= PEin(10) << 7;
data |= PEin(9) << 6;
data |= PEin(8) << 5;
data |= PEin(7) << 4;
data |= PDin(1) << 3;
data |= PDin(0) << 2;
data |= PDin(15) << 1;
data |= PDin(14) << 0;
return data;
}
/**
* @brief 8080协议写数据
* @param u16 data, u8 type（data:16位数据，type:写命令还是写数据）
*
* @retval None
*/
void I80_WR(u16 data, u8 type) {
RS = type;
Data_SetOut(); //设置数据线为输出方式
RD = 1;
CS = 0;
Send_Data(data); //挂载数据
WR = 0;
WR = 1;
CS = 1;
}
/**
* @brief 8080协议读数据
* @param u8 type（type:写命令还是写数据）
*
* @retval u16（16位数据）
*/
u16 I80_RD(u8 type) {
u16 data = 0;
RS = type;
Data_SetIn(); //设置数据线为输出方式
WR = 1;
CS = 0;
RD = 1;
RD = 0;
sleep_us(1);
//可能需要sleep
data = Read_Data();
RD = 1;
CS = 1;
return data;
}
/**
* @brief 8080协议写命令
* @param u16 cmd（命令）
*
* @retval None
*/
void I80_WR_CMD(u16 cmd) {
I80_WR(cmd, CMD);
}
/**
* @brief 8080协议写数据
* @param u16 data（数据）
*
* @retval None
*/
void I80_WR_DATA(u16 data) {
I80_WR(data, DATA);
}
/**
* @brief 8080协议读命令
* @param None
*
* @retval u16(16位命令)
*/
u16 I80_RD_CMD(void) {
return I80_RD(CMD);
}
/**
* @brief 8080协议读数据
* @param None
*
* @retval u16(16位数据)
*/
u16 I80_RD_DATA(void) {
return I80_RD(DATA);
}
/**
* NE4->PG12 CS
* NWE->PD5 WR
* RD->PD4 RD
* RS->PG0 RS
*====DATA数据线===
* D0 D1->PD14 PD15
* D2 D3 ->PD0 PD1
* D4~D12->PE7~PE15
* D13~D15->PD8~PD10
*/
void i80_GPIOInit(void) {
//先初始化与8080控制器相关的
#if MY_USE_STDPERIPH //是否使用库函数，1：使用，0：不使用
#else
//1、时钟初始化
/*配置为复用推挽输出*/
//RCC->APB2ENR |= (1 << 3) | (1 << 5) | (1 << 6) | (1 << 8); //使能GPIO时钟
RCC->APB2ENR |= 0x01 << 5; //设置GPIOD时钟
RCC->APB2ENR |= 0x01 << 6; //设置GPIOE时钟
RCC->APB2ENR |= 0x01 << 8; //设置GPIOG时钟
//数据信号线
//2.GPIO初始化
GPIOG->CRH &= ~(0x0F) << 16;
GPIOG->CRH |= (0x03) << 16; //设置PG12为通用推挽输出模式
GPIOG->CRL &= ~(0x0F) << 0;
GPIOG->CRL |= (0x03) << 0; //设置PG12为通用推挽输出模式
GPIOD->CRL &= ~(0x0F) << 20;
GPIOD->CRL |= (0X03) << 20;
GPIOD->CRL &= ~(0x0F) << 16;
GPIOD->CRL |= (0x03) << 16;
// GPIOB->CRL &= ~(0x0F) << 0;
// GPIOB->CRL |= (0x03) << 0;
Data_SetOut();
//控制信号线
#endif
}
??至此，我们已经完成了8080并口协议的封装，掌握了与NT35510芯片沟通的方法，那么下面便是向NT35510芯片中写入命令与数据，将LCD显示屏设置成我们想要的显示模式。我们首先来看开发板上的电路图
??CS,RS,RD,WR以及DB1~DB16均已经配置过了，RESET引脚为开发板上的复位引脚，不需要管，下面字母T开头的为触摸功能，还剩一个LCD_BL，为背光控制，背光这个词我不理解，但是不开背光屏幕量不起来，因此在LCD进行初始化的时候，不仅需要进行8080协议的初始化，还需要打开背光，不然屏幕就是黑的。
??初始化命令由这一堆子命令构成，若是不闲得没事，请不要尝试。我们直接参考原子哥的代码，打开原子哥的TFT_LCD例程，从这个id=5510开始复制到后面，CV大法。然后根据他写的函数，我们进行补充就行了。
??代码如下
#define LCD_BL PBout(0)
void LCD_Init(void) {
i80_GPIOInit();
RCC->APB2ENR |= 0x01 << 3; //设置GPIOB时钟
GPIOB->CRL &= ~(0x0F << 0);
GPIOB->CRL |= 0x03 << 0; //LCD_BL
sleep_ms(50);//等于正点原子的delay_ms()
LCD_WriteReg(0xF000, 0x55);
LCD_WriteReg(0xF001, 0xAA);
LCD_WriteReg(0xF002, 0x52);
LCD_WriteReg(0xF003, 0x08);
LCD_WriteReg(0xF004, 0x01);
//AVDD Set AVDD 5.2V
LCD_WriteReg(0xB000, 0x0D);
LCD_WriteReg(0xB001, 0x0D);
LCD_WriteReg(0xB002, 0x0D);
//AVDD ratio
LCD_WriteReg(0xB600, 0x34);
LCD_WriteReg(0xB601, 0x34);
LCD_WriteReg(0xB602, 0x34);
//AVEE -5.2V
LCD_WriteReg(0xB100, 0x0D);
LCD_WriteReg(0xB101, 0x0D);
LCD_WriteReg(0xB102, 0x0D);
//AVEE ratio
LCD_WriteReg(0xB700, 0x34);
LCD_WriteReg(0xB701, 0x34);
LCD_WriteReg(0xB702, 0x34);
//VCL -2.5V
LCD_WriteReg(0xB200, 0x00);
LCD_WriteReg(0xB201, 0x00);
LCD_WriteReg(0xB202, 0x00);
//VCL ratio
LCD_WriteReg(0xB800, 0x24);
LCD_WriteReg(0xB801, 0x24);
LCD_WriteReg(0xB802, 0x24);
//VGH 15V (Free pump)
LCD_WriteReg(0xBF00, 0x01);
LCD_WriteReg(0xB300, 0x0F);
LCD_WriteReg(0xB301, 0x0F);
LCD_WriteReg(0xB302, 0x0F);
//VGH ratio
LCD_WriteReg(0xB900, 0x34);
LCD_WriteReg(0xB901, 0x34);
LCD_WriteReg(0xB902, 0x34);
//VGL_REG -10V
LCD_WriteReg(0xB500, 0x08);
LCD_WriteReg(0xB501, 0x08);
LCD_WriteReg(0xB502, 0x08);
LCD_WriteReg(0xC200, 0x03);
//VGLX ratio
LCD_WriteReg(0xBA00, 0x24);
LCD_WriteReg(0xBA01, 0x24);
LCD_WriteReg(0xBA02, 0x24);
//VGMP/VGSP 4.5V/0V
LCD_WriteReg(0xBC00, 0x00);
LCD_WriteReg(0xBC01, 0x78);
LCD_WriteReg(0xBC02, 0x00);
//VGMN/VGSN -4.5V/0V
LCD_WriteReg(0xBD00, 0x00);
LCD_WriteReg(0xBD01, 0x78);
LCD_WriteReg(0xBD02, 0x00);
//VCOM
LCD_WriteReg(0xBE00, 0x00);
LCD_WriteReg(0xBE01, 0x64);
//Gamma Setting
LCD_WriteReg(0xD100, 0x00);
LCD_WriteReg(0xD101, 0x33);
LCD_WriteReg(0xD102, 0x00);
LCD_WriteReg(0xD103, 0x34);
LCD_WriteReg(0xD104, 0x00);
LCD_WriteReg(0xD105, 0x3A);
LCD_WriteReg(0xD106, 0x00);
LCD_WriteReg(0xD107, 0x4A);
LCD_WriteReg(0xD108, 0x00);
LCD_WriteReg(0xD109, 0x5C);
LCD_WriteReg(0xD10A, 0x00);
LCD_WriteReg(0xD10B, 0x81);
LCD_WriteReg(0xD10C, 0x00);
LCD_WriteReg(0xD10D, 0xA6);
LCD_WriteReg(0xD10E, 0x00);
LCD_WriteReg(0xD10F, 0xE5);
LCD_WriteReg(0xD110, 0x01);
LCD_WriteReg(0xD111, 0x13);
LCD_WriteReg(0xD112, 0x01);
LCD_WriteReg(0xD113, 0x54);
LCD_WriteReg(0xD114, 0x01);
LCD_WriteReg(0xD115, 0x82);
LCD_WriteReg(0xD116, 0x01);
LCD_WriteReg(0xD117, 0xCA);
LCD_WriteReg(0xD118, 0x02);
LCD_WriteReg(0xD119, 0x00);
LCD_WriteReg(0xD11A, 0x02);
LCD_WriteReg(0xD11B, 0x01);
LCD_WriteReg(0xD11C, 0x02);
LCD_WriteReg(0xD11D, 0x34);
LCD_WriteReg(0xD11E, 0x02);
LCD_WriteReg(0xD11F, 0x67);
LCD_WriteReg(0xD120, 0x02);
LCD_WriteReg(0xD121, 0x84);
LCD_WriteReg(0xD122, 0x02);
LCD_WriteReg(0xD123, 0xA4);
LCD_WriteReg(0xD124, 0x02);
LCD_WriteReg(0xD125, 0xB7);
LCD_WriteReg(0xD126, 0x02);
LCD_WriteReg(0xD127, 0xCF);
LCD_WriteReg(0xD128, 0x02);
LCD_WriteReg(0xD129, 0xDE);
LCD_WriteReg(0xD12A, 0x02);
LCD_WriteReg(0xD12B, 0xF2);
LCD_WriteReg(0xD12C, 0x02);
LCD_WriteReg(0xD12D, 0xFE);
LCD_WriteReg(0xD12E, 0x03);
LCD_WriteReg(0xD12F, 0x10);
LCD_WriteReg(0xD130, 0x03);
LCD_WriteReg(0xD131, 0x33);
LCD_WriteReg(0xD132, 0x03);
LCD_WriteReg(0xD133, 0x6D);
LCD_WriteReg(0xD200, 0x00);
LCD_WriteReg(0xD201, 0x33);
LCD_WriteReg(0xD202, 0x00);
LCD_WriteReg(0xD203, 0x34);
LCD_WriteReg(0xD204, 0x00);
LCD_WriteReg(0xD205, 0x3A);
LCD_WriteReg(0xD206, 0x00);
LCD_WriteReg(0xD207, 0x4A);
LCD_WriteReg(0xD208, 0x00);
LCD_WriteReg(0xD209, 0x5C);
LCD_WriteReg(0xD20A, 0x00);
LCD_WriteReg(0xD20B, 0x81);
LCD_WriteReg(0xD20C, 0x00);
LCD_WriteReg(0xD20D, 0xA6);
LCD_WriteReg(0xD20E, 0x00);
LCD_WriteReg(0xD20F, 0xE5);
LCD_WriteReg(0xD210, 0x01);
LCD_WriteReg(0xD211, 0x13);
LCD_WriteReg(0xD212, 0x01);
LCD_WriteReg(0xD213, 0x54);
LCD_WriteReg(0xD214, 0x01);
LCD_WriteReg(0xD215, 0x82);
LCD_WriteReg(0xD216, 0x01);
LCD_WriteReg(0xD217, 0xCA);
LCD_WriteReg(0xD218, 0x02);
LCD_WriteReg(0xD219, 0x00);
LCD_WriteReg(0xD21A, 0x02);
LCD_WriteReg(0xD21B, 0x01);
LCD_WriteReg(0xD21C, 0x02);
LCD_WriteReg(0xD21D, 0x34);
LCD_WriteReg(0xD21E, 0x02);
LCD_WriteReg(0xD21F, 0x67);
LCD_WriteReg(0xD220, 0x02);
LCD_WriteReg(0xD221, 0x84);
LCD_WriteReg(0xD222, 0x02);
LCD_WriteReg(0xD223, 0xA4);
LCD_WriteReg(0xD224, 0x02);
LCD_WriteReg(0xD225, 0xB7);
LCD_WriteReg(0xD226, 0x02);
LCD_WriteReg(0xD227, 0xCF);
LCD_WriteReg(0xD228, 0x02);
LCD_WriteReg(0xD229, 0xDE);
LCD_WriteReg(0xD22A, 0x02);
LCD_WriteReg(0xD22B, 0xF2);
LCD_WriteReg(0xD22C, 0x02);
LCD_WriteReg(0xD22D, 0xFE);
LCD_WriteReg(0xD22E, 0x03);
LCD_WriteReg(0xD22F, 0x10);
LCD_WriteReg(0xD230, 0x03);
LCD_WriteReg(0xD231, 0x33);
LCD_WriteReg(0xD232, 0x03);
LCD_WriteReg(0xD233, 0x6D);
LCD_WriteReg(0xD300, 0x00);
LCD_WriteReg(0xD301, 0x33);
LCD_WriteReg(0xD302, 0x00);
LCD_WriteReg(0xD303, 0x34);
LCD_WriteReg(0xD304, 0x00);
LCD_WriteReg(0xD305, 0x3A);
LCD_WriteReg(0xD306, 0x00);
LCD_WriteReg(0xD307, 0x4A);
LCD_WriteReg(0xD308, 0x00);
LCD_WriteReg(0xD309, 0x5C);
LCD_WriteReg(0xD30A, 0x00);
LCD_WriteReg(0xD30B, 0x81);
LCD_WriteReg(0xD30C, 0x00);
LCD_WriteReg(0xD30D, 0xA6);
LCD_WriteReg(0xD30E, 0x00);
LCD_WriteReg(0xD30F, 0xE5);
LCD_WriteReg(0xD310, 0x01);
LCD_WriteReg(0xD311, 0x13);
LCD_WriteReg(0xD312, 0x01);
LCD_WriteReg(0xD313, 0x54);
LCD_WriteReg(0xD314, 0x01);
LCD_WriteReg(0xD315, 0x82);
LCD_WriteReg(0xD316, 0x01);
LCD_WriteReg(0xD317, 0xCA);
LCD_WriteReg(0xD318, 0x02);
LCD_WriteReg(0xD319, 0x00);
LCD_WriteReg(0xD31A, 0x02);
LCD_WriteReg(0xD31B, 0x01);
LCD_WriteReg(0xD31C, 0x02);
LCD_WriteReg(0xD31D, 0x34);
LCD_WriteReg(0xD31E, 0x02);
LCD_WriteReg(0xD31F, 0x67);
LCD_WriteReg(0xD320, 0x02);
LCD_WriteReg(0xD321, 0x84);
LCD_WriteReg(0xD322, 0x02);
LCD_WriteReg(0xD323, 0xA4);
LCD_WriteReg(0xD324, 0x02);
LCD_WriteReg(0xD325, 0xB7);
LCD_WriteReg(0xD326, 0x02);
LCD_WriteReg(0xD327, 0xCF);
LCD_WriteReg(0xD328, 0x02);
LCD_WriteReg(0xD329, 0xDE);
LCD_WriteReg(0xD32A, 0x02);
LCD_WriteReg(0xD32B, 0xF2);
LCD_WriteReg(0xD32C, 0x02);
LCD_WriteReg(0xD32D, 0xFE);
LCD_WriteReg(0xD32E, 0x03);
LCD_WriteReg(0xD32F, 0x10);
LCD_WriteReg(0xD330, 0x03);
LCD_WriteReg(0xD331, 0x33);
LCD_WriteReg(0xD332, 0x03);
LCD_WriteReg(0xD333, 0x6D);
LCD_WriteReg(0xD400, 0x00);
LCD_WriteReg(0xD401, 0x33);
LCD_WriteReg(0xD402, 0x00);
LCD_WriteReg(0xD403, 0x34);
LCD_WriteReg(0xD404, 0x00);
LCD_WriteReg(0xD405, 0x3A);
LCD_WriteReg(0xD406, 0x00);
LCD_WriteReg(0xD407, 0x4A);
LCD_WriteReg(0xD408, 0x00);
LCD_WriteReg(0xD409, 0x5C);
LCD_WriteReg(0xD40A, 0x00);
LCD_WriteReg(0xD40B, 0x81);
LCD_WriteReg(0xD40C, 0x00);
LCD_WriteReg(0xD40D, 0xA6);
LCD_WriteReg(0xD40E, 0x00);
LCD_WriteReg(0xD40F, 0xE5);
LCD_WriteReg(0xD410, 0x01);
LCD_WriteReg(0xD411, 0x13);
LCD_WriteReg(0xD412, 0x01);
LCD_WriteReg(0xD413, 0x54);
LCD_WriteReg(0xD414, 0x01);
LCD_WriteReg(0xD415, 0x82);
LCD_WriteReg(0xD416, 0x01);
LCD_WriteReg(0xD417, 0xCA);
LCD_WriteReg(0xD418, 0x02);
LCD_WriteReg(0xD419, 0x00);
LCD_WriteReg(0xD41A, 0x02);
LCD_WriteReg(0xD41B, 0x01);
LCD_WriteReg(0xD41C, 0x02);
LCD_WriteReg(0xD41D, 0x34);
LCD_WriteReg(0xD41E, 0x02);
LCD_WriteReg(0xD41F, 0x67);
LCD_WriteReg(0xD420, 0x02);
LCD_WriteReg(0xD421, 0x84);
LCD_WriteReg(0xD422, 0x02);
LCD_WriteReg(0xD423, 0xA4);
LCD_WriteReg(0xD424, 0x02);
LCD_WriteReg(0xD425, 0xB7);
LCD_WriteReg(0xD426, 0x02);
LCD_WriteReg(0xD427, 0xCF);
LCD_WriteReg(0xD428, 0x02);
LCD_WriteReg(0xD429, 0xDE);
LCD_WriteReg(0xD42A, 0x02);
LCD_WriteReg(0xD42B, 0xF2);
LCD_WriteReg(0xD42C, 0x02);
LCD_WriteReg(0xD42D, 0xFE);
LCD_WriteReg(0xD42E, 0x03);
LCD_WriteReg(0xD42F, 0x10);
LCD_WriteReg(0xD430, 0x03);
LCD_WriteReg(0xD431, 0x33);
LCD_WriteReg(0xD432, 0x03);
LCD_WriteReg(0xD433, 0x6D);
LCD_WriteReg(0xD500, 0x00);
LCD_WriteReg(0xD501, 0x33);
LCD_WriteReg(0xD502, 0x00);
LCD_WriteReg(0xD503, 0x34);
LCD_WriteReg(0xD504, 0x00);
LCD_WriteReg(0xD505, 0x3A);
LCD_WriteReg(0xD506, 0x00);
LCD_WriteReg(0xD507, 0x4A);
LCD_WriteReg(0xD508, 0x00);
LCD_WriteReg(0xD509, 0x5C);
LCD_WriteReg(0xD50A, 0x00);
LCD_WriteReg(0xD50B, 0x81);
LCD_WriteReg(0xD50C, 0x00);
LCD_WriteReg(0xD50D, 0xA6);
LCD_WriteReg(0xD50E, 0x00);
LCD_WriteReg(0xD50F, 0xE5);
LCD_WriteReg(0xD510, 0x01);
LCD_WriteReg(0xD511, 0x13);
LCD_WriteReg(0xD512, 0x01);
LCD_WriteReg(0xD513, 0x54);
LCD_WriteReg(0xD514, 0x01);
LCD_WriteReg(0xD515, 0x82);
LCD_WriteReg(0xD516, 0x01);
LCD_WriteReg(0xD517, 0xCA);
LCD_WriteReg(0xD518, 0x02);
LCD_WriteReg(0xD519, 0x00);
LCD_WriteReg(0xD51A, 0x02);
LCD_WriteReg(0xD51B, 0x01);
LCD_WriteReg(0xD51C, 0x02);
LCD_WriteReg(0xD51D, 0x34);
LCD_WriteReg(0xD51E, 0x02);
LCD_WriteReg(0xD51F, 0x67);
LCD_WriteReg(0xD520, 0x02);
LCD_WriteReg(0xD521, 0x84);
LCD_WriteReg(0xD522, 0x02);
LCD_WriteReg(0xD523, 0xA4);
LCD_WriteReg(0xD524, 0x02);
LCD_WriteReg(0xD525, 0xB7);
LCD_WriteReg(0xD526, 0x02);
LCD_WriteReg(0xD527, 0xCF);
LCD_WriteReg(0xD528, 0x02);
LCD_WriteReg(0xD529, 0xDE);
LCD_WriteReg(0xD52A, 0x02);
LCD_WriteReg(0xD52B, 0xF2);
LCD_WriteReg(0xD52C, 0x02);
LCD_WriteReg(0xD52D, 0xFE);
LCD_WriteReg(0xD52E, 0x03);
LCD_WriteReg(0xD52F, 0x10);
LCD_WriteReg(0xD530, 0x03);
LCD_WriteReg(0xD531, 0x33);
LCD_WriteReg(0xD532, 0x03);
LCD_WriteReg(0xD533, 0x6D);
LCD_WriteReg(0xD600, 0x00);
LCD_WriteReg(0xD601, 0x33);
LCD_WriteReg(0xD602, 0x00);
LCD_WriteReg(0xD603, 0x34);
LCD_WriteReg(0xD604, 0x00);
LCD_WriteReg(0xD605, 0x3A);
LCD_WriteReg(0xD606, 0x00);
LCD_WriteReg(0xD607, 0x4A);
LCD_WriteReg(0xD608, 0x00);
LCD_WriteReg(0xD609, 0x5C);
LCD_WriteReg(0xD60A, 0x00);
LCD_WriteReg(0xD60B, 0x81);
LCD_WriteReg(0xD60C, 0x00);
LCD_WriteReg(0xD60D, 0xA6);
LCD_WriteReg(0xD60E, 0x00);
LCD_WriteReg(0xD60F, 0xE5);
LCD_WriteReg(0xD610, 0x01);
LCD_WriteReg(0xD611, 0x13);
LCD_WriteReg(0xD612, 0x01);
LCD_WriteReg(0xD613, 0x54);
LCD_WriteReg(0xD614, 0x01);
LCD_WriteReg(0xD615, 0x82);
LCD_WriteReg(0xD616, 0x01);
LCD_WriteReg(0xD617, 0xCA);
LCD_WriteReg(0xD618, 0x02);
LCD_WriteReg(0xD619, 0x00);
LCD_WriteReg(0xD61A, 0x02);
LCD_WriteReg(0xD61B, 0x01);
LCD_WriteReg(0xD61C, 0x02);
LCD_WriteReg(0xD61D, 0x34);
LCD_WriteReg(0xD61E, 0x02);
LCD_WriteReg(0xD61F, 0x67);
LCD_WriteReg(0xD620, 0x02);
LCD_WriteReg(0xD621, 0x84);
LCD_WriteReg(0xD622, 0x02);
LCD_WriteReg(0xD623, 0xA4);
LCD_WriteReg(0xD624, 0x02);
LCD_WriteReg(0xD625, 0xB7);
LCD_WriteReg(0xD626, 0x02);
LCD_WriteReg(0xD627, 0xCF);
LCD_WriteReg(0xD628, 0x02);
LCD_WriteReg(0xD629, 0xDE);
LCD_WriteReg(0xD62A, 0x02);
LCD_WriteReg(0xD62B, 0xF2);
LCD_WriteReg(0xD62C, 0x02);
LCD_WriteReg(0xD62D, 0xFE);
LCD_WriteReg(0xD62E, 0x03);
LCD_WriteReg(0xD62F, 0x10);
LCD_WriteReg(0xD630, 0x03);
LCD_WriteReg(0xD631, 0x33);
LCD_WriteReg(0xD632, 0x03);
LCD_WriteReg(0xD633, 0x6D);
//LV2 Page 0 enable
LCD_WriteReg(0xF000, 0x55);
LCD_WriteReg(0xF001, 0xAA);
LCD_WriteReg(0xF002, 0x52);
LCD_WriteReg(0xF003, 0x08);
LCD_WriteReg(0xF004, 0x00);
//Display control
LCD_WriteReg(0xB100, 0xCC);
LCD_WriteReg(0xB101, 0x00);
//Source hold time
LCD_WriteReg(0xB600, 0x05);
//Gate EQ control
LCD_WriteReg(0xB700, 0x70);
LCD_WriteReg(0xB701, 0x70);
//Source EQ control (Mode 2)
LCD_WriteReg(0xB800, 0x01);
LCD_WriteReg(0xB801, 0x03);
LCD_WriteReg(0xB802, 0x03);
LCD_WriteReg(0xB803, 0x03);
//Inversion mode (2-dot)
LCD_WriteReg(0xBC00, 0x02);
LCD_WriteReg(0xBC01, 0x00);
LCD_WriteReg(0xBC02, 0x00);
//Timing control 4H w/ 4-delay
LCD_WriteReg(0xC900, 0xD0);
LCD_WriteReg(0xC901, 0x02);
LCD_WriteReg(0xC902, 0x50);
LCD_WriteReg(0xC903, 0x50);
LCD_WriteReg(0xC904, 0x50);
LCD_WriteReg(0x3500, 0x00);
LCD_WriteReg(0x3A00, 0x55); //16-bit/pixel
//
LCD_WR(0x1100);
sleep_us(120);//等于正点原子的delay_us
LCD_WR(0x2900);
LCD_BL = 1; //打开背光显示
}
??接着我们便是去封装这些函数，说白了就是用8080我们已经写好的读写方法去封装一个LCD的读写方法，本质没有改变。
/**
* @brief LCD写寄存器
* @param u16 addr, u16 data（16位的地址和16位的数据）
*
* @retval None
*/
void LCD_WriteReg(u16 addr, u16 data) {
I80_WR_CMD(addr);
I80_WR_DATA(data);
}
/**
* @brief LCD写
* @param u16 addr（16位的地址）
*
* @retval None
*/
void LCD_WR(u16 addr) {
I80_WR_CMD(addr);
}
/**
* @brief LCD读数据
* @param 16位的数据
*
* @retval None
*/
u16 LCD_RD(void) {
return I80_RD_DATA();
}
/**
* @brief LCD读寄存器
* @param u16 addr（16位的地址）
*
* @retval 16位的数据
*/
u16 LCD_RD_Reg(u16 addr) {
I80_WR_CMD(addr);
//sleep_us(5);
return I80_RD_DATA();
}
??为啥要整LCD_WriteReg和LCD_WR这两个函数呢，因为这个芯片有时候要给个地址就行了，不需要数据，或者也可以不写LCD_WR这个函数，使用LCD_WriteReg(addr,0)也可以，写个0进去。读的话需要携程两个函数，因为有时候你写一个指定地址，他能读一堆数据出来，即连续读，如果此时使用LCD_RD_Reg这个函数的话，相当于重新写地址重新开始读数据。
??到这里的话，这个显示屏已经能够成功初始化了，下面我们分析如何画一个小点，我们继续来看NT35510的数据手册，注意到下面这一堆东西。
??首先需要建立一个概念，横着的叫行，竖着的叫列，第几列是x方向，第几行是y方向，Column是列的意思，Row是行的意思。我们首先来看Column。
??看下面的Restriction，MV代表横竖屏幕的意思，我们可以理解出这个芯片总共有4个地址用来控制显示屏,2个16位的寄存器，XS和XE，其中XS必然小于等于XE，那我们大致可以知道，总共有32位地址数据，但我们的显示屏很小，X方向只有480，所以我们的x的最大为479，小于2的9次方大于2的8次方，因此我们需要9位数据，需要设置XS这个16位寄存器即可，需要向XS的高位地址，即2A00，XS的低位地址，即2A00+1，写入X轴的数据。那么同样，我们来看Row寄存器，我们屏幕y方向为800，小于2的10次方大于2的9次方，也是需要用到YS的高8位和低8位。
??那么当我们需要定位x和y坐标时，首先需要一个16位的数据地址，因为8位不够用了，需要一个u16类型的，其次就是将高八位给2A00或者2B00地址，将地8位给2A01或2B01地址即可。
void LCD_SetCursor(u16 x, u16 y) {
LCD_WriteReg(0x2A00, x >> 8);
LCD_WriteReg(0x2A00 + 1, x & 0XFF);
LCD_WriteReg(0x2B00, y >> 8);
LCD_WriteReg(0x2B00 + 1, y & 0XFF);
}
??有了上述的基础，我们已经能够定位屏幕的各个方向了。但我们只是完成了定位，还没有往里面塞东西，下面来看memory寄存器，也就相当于以前的GRAM地址，往2C00里面写一个像素的颜色，便完成了显示一个点的任务了。
//foreground 画笔颜色
void LCD_WR_Point(u16 x, u16 y, u16 foreground) {
LCD_WriteReg(0x2A00, x >> 8);
LCD_WriteReg(0x2A00 + 1, x & 0XFF);
LCD_WriteReg(0x2B00, y >> 8);
LCD_WriteReg(0x2B00 + 1, y & 0XFF);
I80_WR_CMD(0X2C00); //写memory,即填充眼色
I80_WR_DATA(foreground);
}
至此，我们便实现了画点的工作，至于显示字符串，那只需要填充点即可，给出一张图即可理解，本质就是往里面塞点。
本文基于米嗨Stm32教程编写，大家如果想学习STM32，可以淘宝搜索米嗨教育。
工程链接
链接：https://pan.baidu.com/s/10qnvbycjwXbyyLKeruf0sg?pwd=kxtl
提取码：kxtl
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