【GD32F350开发分享五】GPIO模拟SPI控制液晶显示屏

Justice_Gao

【GD32F350开发分享五】GPIO模拟SPI控制液晶显示屏 [复制链接]

大家都应该知道，用GPIO模拟SPI的话，涉及GPIO的输出高低电平、读取电平，先来看GPIO的寄存器

（1）GPIOx_CTL寄存器控制GPIO的模式（Pin0~Pin15）
00：输入模式（复位值） 01：GPIO输出模式 10：备用功能模式 11：模拟模式
（2）GPIOx_OMODE寄存器控制GPIO的输出模式（Pin0~Pin15）
该位由软件置位和清除。 0：输出推挽模式（复位值） 1：输出开漏模式
（3）GPIOx_OSPD0寄存器控制GPIO的输出速度（Pin0~Pin15）
该位由软件置位和清除。 x0：输出最大速度2M（复位值） 01：输出最大速度10M 11：输出最大速度50M
（4）GPIOx_PUD寄存器控制GPIO的上下拉
该位由软件置位和清除。 00：悬空模式，无上拉和下拉（复位值） 01：端口上拉模式 10：端口下拉模式 11：保留
（5）GPIOx_ISTAT寄存器为端口输入状态寄存器，低16位有效
这些位由软件置位和清除。 0：引脚输入信号为低电平 1：引脚输入信号为高电平
（6）GPIOx_OCTL寄存器为端口输出控制寄存器，低16位有效
该位由软件置位和清除。 0：引脚输出低电平 1：引脚输出高电平

下面为液晶显示屏的驱动程序

#include "gd32f3x0.h"
#include <stdio.h>
#include "gd32f3x0_eval.h"
#include "systick.h"
#include "lcd.h"
static unsigned char LcdSystab[] = {0x30,0x87,0x07,0x28,0x2f,0x0f0,0x28,0x00};
static unsigned char LcdScrtab[] = {0x00,0x00,0x0f0,0x00,0x40,0x0f0,0x00,0x80,0x00,0x00};
#define CLOCK 9
/*------------------------------------------------------------
usÑóê±oˉêy
------------------------------------------------------------*/
void Delay_Nus(unsigned int us)
{
uint8_t n;
while(us--)for(n=0;n<CLOCK;n++);
}
/*------------------------------------------------------------
msÑóê±oˉêy
------------------------------------------------------------*/
void Delay_Nms(unsigned int ms)
{
while(ms--)Delay_Nus(1000);
}
void LcdDelay(void)
{
Delay_Nus(5);
}
void chk_busy(void)
{
GPIO_BC(GPIOC)=GPIO_PIN_6;
GPIO_CTL(GPIOB) = (GPIO_CTL(GPIOB) & 0xf0ffffff) | 0x08000000;
WR_1;
A0_0;
RD_0;
Delay_Nus(0);
while(BUSY==1)
{
}
RD_1;
GPIO_CTL(GPIOB)= (GPIO_CTL(GPIOB) & 0xf0ffffff) | 0x03000000;
}
void send_cmd(uchar cmd)
{
chk_busy();
RD_1;
A0_1;
DataOUT = ((DataOUT & 0x00ff) | (((uint16_t)cmd)<<8));
WR_0;
Delay_Nus(1);
WR_1;
}
void send_dat(uchar dat)
{
chk_busy ();
RD_1;
A0_0;
DataOUT = ((DataOUT & 0x00ff) | (((uint16_t)dat)<<8));
WR_0;
Delay_Nus(1);
WR_1;
}
uchar Read_data(void)
{
uint8_t temp = 0;
GPIO_OCTL(GPIOB) &= 0x00ff;
GPIO_CTL(GPIOB) = (GPIO_CTL(GPIOB) & 0x00000000) | 0x88888888;
A0_1;
WR_1;
RD_0;
temp = DataIN>>8;
RD_1;
GPIO_CTL(GPIOB) = (GPIO_CTL(GPIOB) & 0x00000000) | 0x33333333;
return temp;
}
// -------------------?????????------------------
void LcdCsrW ( unsigned char x, unsigned char y)
{
send_cmd(CsrW);
LcdDelay();
send_dat(x);
LcdDelay();
send_dat(y);
LcdDelay();
return;
}
// ????===================================
void LcdClear(void)
{
unsigned int x,y;
send_cmd(CsrDirR); //????
LcdDelay();
LcdCsrW (0,0);
send_cmd(mWrite);
for(x = 0;x<40;x++)
for(y = 0;y<240;y++)
{
LcdDelay();
send_dat(0x0ff);
}
}
void LcdHZ(unsigned char x, unsigned int y,unsigned char *pdata,unsigned char flag)
{
unsigned char i,j;
unsigned int Addr,tpInt;
unsigned char a ,b;
send_cmd(CsrDirR);
LcdDelay();
for(j = 0; j<2; j++)
{
if (x+j>=40)
return;
for (i = 0; i<16; i++)
{
Addr = (y+i)*40 + (x + j);
a = Addr & 0x0FF;
b = Addr >> 8;
LcdCsrW (a,b);
LcdDelay();
send_cmd(mWrite);
LcdDelay();
a=j*16+i;
tpInt=pdata[a>>1];
if (a & 0x0001)
b=tpInt & 0x00FF;
else
b=(tpInt>>8) & 0x00FF;
if(!flag)
{
b=~b;
}
send_dat(b);
}
}
}
//---------------------??------x 0?39 y 0?239 ------8 X 16---------------
void LcdChar(unsigned char x, unsigned char y, unsigned char *pdata, unsigned char flag) //flag 0?? 1??
{
unsigned char i,a,b;
unsigned int Addr,tpInt;
send_cmd(CsrDirD); //????
LcdDelay();
if (x>=40) // x 0?39
return;
for (i = 0; i<16; i++)
{
Addr = (y+i)*40 + x ;
a = Addr & 0x0FF;
b = Addr >> 8;
LcdCsrW (a,b);
LcdDelay();
send_cmd(mWrite);
LcdDelay();
tpInt=pdata[i>>1];
if (i & 0x0001)
b=tpInt & 0x00FF;
else
b=(tpInt>>8) & 0x00FF;
if(!flag)
{
b=~b;
}
send_dat(b);
}
}
//-----------x=0 ? 319 y=0 ? 239 ----------------------------
void LcdPoint( unsigned int x, unsigned int y, unsigned char flag) //flag = 0 ??(?), bf=1 ??(?), bf=2 ????(??)
{
unsigned int Addr;
unsigned int a ,b;
unsigned char temp ;
unsigned int bitAddr = 0;
unsigned char bit1;
a = x >> 3;
//temp = Sed[a][y];
bitAddr = x - ( a << 3 );
b = y*40;
Addr = b + a;
a = Addr & 0x0FF;
b = Addr >> 8;
bit1 = 0x80;
if(bitAddr)
bit1 = bit1>>bitAddr;
if(flag == 0)//?
temp = bit1 | temp;
else if(flag == 1) //?
{
bit1 = 255- bit1;
temp = (bit1 & temp);
}
else if(flag == 2)//??
temp = bit1 ^ temp;
send_cmd(CsrDirD); //????
LcdDelay();
LcdCsrW( a, b);
LcdDelay();
send_cmd(mWrite);
LcdDelay();
//Sed[x >> 3][y] = temp; //should be here,befor LcdWDataAddr = temp;
send_dat(temp);
}
//-------------x=0 ? 319 y=0 ? 239 ------------------------
void LcdLine(unsigned int x0, unsigned int y0, unsigned int x1, unsigned int y1, unsigned char flag)//flag 0 ??, bf=1 ??, bf=2 ????
{
register unsigned char t;
int xerr=0,yerr=0,delta_x,delta_y,distance;
int incx,incy;
unsigned int row,col;
if (x0>x1)
{
t=x0;
x0=x1;
x1=t;
}// x0? x1?
if (y0>y1)
{
t=y0;
y0=y1;
y1=t;
}// y0? y1?
if (x1>319)
x1=319;
if (y1>239)
y1=239;
delta_x = x1-x0; //??????
delta_y = y1-y0;
col = x0;
row = y0;
if(delta_x>0) incx=1; //??????
else
{
if( delta_x==0 ) incx=0; //???
else {incx=-1;delta_x=-delta_x;}
}
if(delta_y>0) incy=1;
else
{
if( delta_y==0 ) incy=0; //???
else {incy=-1;delta_y=-delta_y;}
}
if( delta_x > delta_y ) distance=delta_x; //?????????
else distance=delta_y;
for( t=0;t <= distance+1; t++ ) //????
{
LcdPoint(col, row, flag); //??
xerr += delta_x ;
yerr += delta_y ;
if( xerr > distance )
{
xerr-=distance;
col+=incx;
}
if( yerr > distance )
{
yerr-=distance;
row+=incy;
}
}
}
// ==========????????=========================================
void LcdInit(void)
{
unsigned char i = 0;
send_cmd(SystemSet);
LcdDelay();
for ( i = 0; i<8; i++){
LcdDelay();
send_dat(LcdSystab[i]);
}
send_cmd(Scroll);
LcdDelay();
for ( i = 0; i<10; i++){
LcdDelay();
send_dat(LcdScrtab[i]);
}
send_cmd(HdotSet);
LcdDelay();
send_dat(0x00);
LcdDelay();
send_cmd(Ovlay);
LcdDelay();
send_dat(0x0C);
LcdDelay();
LcdClear();
send_cmd(DispOn);
LcdDelay();
send_dat(0x04);
LcdDelay();
}

复制代码

#ifndef __LCD_H
#define __LCD_H
#include "gd32f3x0.h"
#include <stdio.h>
#include "gd32f3x0_eval.h"
#include "systick.h"
#define uchar unsigned char
#define uint unsigned int
#define A0_0 GPIO_BOP(GPIOC)=GPIO_PIN_2
#define A0_1 GPIO_BC(GPIOC)=GPIO_PIN_2
#define WR_0 GPIO_BOP(GPIOC)=GPIO_PIN_3
#define WR_1 GPIO_BC(GPIOC)=GPIO_PIN_3
#define RD_0 GPIO_BOP(GPIOC)=GPIO_PIN_4
#define RD_1 GPIO_BC(GPIOC)=GPIO_PIN_4
#define CS_0 GPIO_BOP(GPIOC)=GPIO_PIN_5
#define CS_1 GPIO_BC(GPIOC)=GPIO_PIN_5
#define BUSY gpio_input_bit_get(GPIOC,GPIO_PIN_6)
#define DataOUT GPIO_OCTL(GPIOB)
#define DataIN GPIO_ISTAT(GPIOB)
/*--------------------------------------------------------------*/
//???????????
#define SystemSet 0x40
#define SleepIn 0x53
#define DispOn 0x59
#define DispOff 0x58
#define Scroll 0x44
#define Csrform 0x5d
#define CgramAdr 0x50
#define CsrDirR 0x4c
#define CsrDirL 0x4d
#define CsrDirU 0x4e
#define CsrDirD 0x4f
#define HdotSet 0x5a
#define Ovlay 0x5b
#define CsrW 0x46
#define CsrR 0x47
#define mWrite 0x42
#define mRead 0x43
void LCD_PinInit(void);
void chk_busy(void);
void send_cmd(uchar cmd);
void send_dat(uchar dat);
void Delay_Nms(uint n);
void Delay_Nus(uint n);
#define LCD_SCROLL 0x44
void LcdClear(void);
//------------flag 0?? 1??-----------------------------------------------
void LcdHZ(unsigned char x, unsigned int y,unsigned char *pdata,unsigned char flag);
void LcdChar(unsigned char x, unsigned char y, unsigned char *pdata, unsigned char flag);
//-----------flag = 0 ??(?), bf=1 ??(?), bf=2 ????(??)-----------
void LcdPoint( unsigned int x, unsigned int y, unsigned char flag);
//-----------flag = 0 ??(?), bf=1 ??(?), bf=2 ????(??)-----------
void LcdLine(unsigned int x0, unsigned int y0, unsigned int x1, unsigned int y1, unsigned char flag);
void LcdInit(void);
void LcdCsrW ( unsigned char x, unsigned char y);
void Delay_ns();
#endif

复制代码

Justice_Gao

/* enable the led clock */
rcu_periph_clock_enable(RCU_GPIOC);
/* configure led GPIO port */
gpio_mode_set(GPIOC, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN_2|GPIO_PIN_3|GPIO_PIN_4|GPIO_PIN_5);
gpio_output_options_set(GPIOC, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_2|GPIO_PIN_3|GPIO_PIN_4|GPIO_PIN_5);
补上

【GD32F350开发分享五】GPIO模拟SPI控制液晶显示屏 [复制链接]

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