[stm32] 一个简单的stm32vet6驱动2.4寸240X320的8位并口tft屏DEMO

 

书接上文:

最近在研究用低速、低RAM的单片机来驱动小LCD或TFT彩屏实现动画效果

首先我用一个16MHz晶振的m0内核的8位单片机nRF51822尝试驱动一个1.77寸的4线SPI屏(128X160),

发现,刷一屏大约要0.8s左右的时间,

具体收录在《1、一个简单的nRF51822驱动的天马4线SPI-1.77寸LCD彩屏DEMO》中

觉得,如果用72MHz的STM32也许效果会好很多

于是在stm32上做了个类似的版本,

具体收录在《一个简单的stm32vet6驱动的天马4线SPI-1.77寸LCD彩屏DEMO》中

发现刷一屏0.2s左右,

效果是有的,但是还不能达到支持播放流畅动画的效果!

于是,决定将串行数据改成并行数据传输

本节将带来一个用stm32驱动的2.4寸240X320的8位并口tft屏的刷屏效果

 

工程结构

[stm32] 一个简单的stm32vet6驱动2.4寸240X320的8位并口tft屏DEMO_第1张图片

 

main.c

 1 /* Includes ------------------------------------------------------------------*/
 2 #include "stm32f10x.h"
 3 #include "LCD2.h"
 4 
 5 
 6 void RCC_Configuration(void);
 7 /****************************************************************************
 8 * 名    称:int main(void)
 9 * 功    能:主函数
10 * 入口参数:无
11 * 出口参数:无
12 * 说    明:
13 * 调用方法:无 
14 ****************************************************************************/ 
15 int main(void)
16 {
17     RCC_Configuration();                   //系统时钟配置
18     LCD2_GPIO_Init();
19     LCD2_Init();
20     while (1)
21     {
22         Show_RGB(0,240,0,320,0xff0f);
23         DELAY_MS(1000);
24         Show_RGB(0,240,0,320,0x00fe);
25         DELAY_MS(1000);
26     }
27 }
28 
29 /****************************************************************************
30 * 名    称:void RCC_Configuration(void)
31 * 功    能:系统时钟配置为72MHZ
32 * 入口参数:无
33 * 出口参数:无
34 * 说    明:
35 * 调用方法:无 
36 ****************************************************************************/ 
37 void RCC_Configuration(void)
38 {   
39   SystemInit();
40 }

 

LCD2.c

  1 #include "LCD2.h"
  2 
  3 
  4 
  5 void LCD2_GPIO_Init()
  6 {
  7     GPIO_InitTypeDef GPIO_InitStructure;
  8 
  9     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOD | RCC_APB2Periph_AFIO, ENABLE);
 10     
 11     
 12     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9;
 13     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
 14     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;             //口线翻转速度为50MHz
 15     GPIO_Init(GPIOB, &GPIO_InitStructure);
 16     
 17     //8位数据输出
 18     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
 19     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
 20     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;             //口线翻转速度为50MHz
 21     GPIO_Init(GPIOD, &GPIO_InitStructure);            
 22 }
 23 
 24 //////////////////////////////////////////////////////////////////
 25 //最底层数据传输函数
 26 //////////////////////////////////////////////////////////////////
 27 //写命令
 28 void Write_Cmd(unsigned char DH,unsigned char DL)
 29 {
 30     LCD2_CS=0;
 31     LCD2_RS=0;
 32 
 33     DataPort=DH;
 34     LCD2_RW=0;
 35     LCD2_RW=1;
 36 
 37     DataPort=DL;
 38     
 39     LCD2_RW=0;
 40     LCD2_RW=1;
 41     LCD2_CS=1;
 42 }
 43 //写数据 双8位
 44 void Write_Data(unsigned char DH,unsigned char DL)
 45 {
 46     LCD2_CS=0;
 47     
 48     LCD2_RS=1;
 49     DataPort=DH;
 50     LCD2_RW=0;
 51     LCD2_RW=1;
 52 
 53     DataPort=DL;    
 54     LCD2_RW=0;
 55     LCD2_RW=1;
 56     LCD2_CS=1;
 57 }
 58 
 59 //写数据 双8位
 60 void Write_Data2(unsigned char DH,unsigned char DL)
 61 {
 62     DataPort=DH;
 63     LCD2_RW=0;
 64     LCD2_RW=1;
 65 
 66     DataPort=DL;    
 67     LCD2_RW=0;
 68     LCD2_RW=1;
 69 }
 70 
 71 //////////////////////////////////////////////////////////////////
 72 //调用上面最底层实现稍高层写命令和数据函数
 73 //////////////////////////////////////////////////////////////////
 74 /*----------------------------------------------------------------
 75                          写命令、写数据
 76 输入参数:x 需要输入的命令 16位
 77           y 需要输入的数据 16位
 78 ----------------------------------------------------------------*/
 79 void  Write_Cmd_Data (unsigned char x,unsigned int y)
 80 {
 81     unsigned char m,n;
 82     m=y>>8;
 83     n=y;
 84     Write_Cmd(0x00,x);
 85     Write_Data(m,n);
 86 }
 87 /*----------------------------------------------------------------
 88                          写16位数据
 89 ----------------------------------------------------------------*/
 90 void  Write_Data_U16(unsigned int y)
 91 {
 92     unsigned char m,n;
 93     m=y>>8;
 94     n=y;
 95     Write_Data2(m,n);
 96 }
 97 
 98 /*----------------------------------------------------------------
 99                             液晶初始化
100 ----------------------------------------------------------------*/
101 void LCD2_Init(void)
102 { 
103     LCD2_CS=1;
104     DELAY_MS(5);
105     LCD2_RES=0;
106     DELAY_MS(5);
107     LCD2_RES=1;
108     DELAY_MS(50);
109     Write_Cmd_Data(0x0001,0x0100); 
110     Write_Cmd_Data(0x0002,0x0700); 
111     Write_Cmd_Data(0x0003,0x1030); 
112     Write_Cmd_Data(0x0004,0x0000); 
113     Write_Cmd_Data(0x0008,0x0207);  
114     Write_Cmd_Data(0x0009,0x0000);
115     Write_Cmd_Data(0x000A,0x0000); 
116     Write_Cmd_Data(0x000C,0x0000); 
117     Write_Cmd_Data(0x000D,0x0000);
118     Write_Cmd_Data(0x000F,0x0000);
119     //power on sequence VGHVGL
120     Write_Cmd_Data(0x0010,0x0000);   
121     Write_Cmd_Data(0x0011,0x0007);  
122     Write_Cmd_Data(0x0012,0x0000);  
123     Write_Cmd_Data(0x0013,0x0000); 
124     //vgh 
125     Write_Cmd_Data(0x0010,0x1290);   
126     Write_Cmd_Data(0x0011,0x0227);
127     //DELAY_MS(100);
128     //vregiout 
129     Write_Cmd_Data(0x0012,0x001d); //0x001b
130     //DELAY_MS(100); 
131     //vom amplitude
132     Write_Cmd_Data(0x0013,0x1500);
133     //DELAY_MS(100); 
134     //vom H
135     Write_Cmd_Data(0x0029,0x0018); 
136     Write_Cmd_Data(0x002B,0x000D); 
137 
138     //gamma
139     Write_Cmd_Data(0x0030,0x0004);
140     Write_Cmd_Data(0x0031,0x0307);
141     Write_Cmd_Data(0x0032,0x0002);// 0006
142     Write_Cmd_Data(0x0035,0x0206);
143     Write_Cmd_Data(0x0036,0x0408);
144     Write_Cmd_Data(0x0037,0x0507); 
145     Write_Cmd_Data(0x0038,0x0204);//0200
146     Write_Cmd_Data(0x0039,0x0707); 
147     Write_Cmd_Data(0x003C,0x0405);// 0504
148     Write_Cmd_Data(0x003D,0x0F02); 
149     //ram
150     Write_Cmd_Data(0x0050,0x0000); 
151     Write_Cmd_Data(0x0051,0x00EF);
152     Write_Cmd_Data(0x0052,0x0000); 
153     Write_Cmd_Data(0x0053,0x013F);  
154     Write_Cmd_Data(0x0060,0xA700); 
155     Write_Cmd_Data(0x0061,0x0001); 
156     Write_Cmd_Data(0x006A,0x0000); 
157     //
158     Write_Cmd_Data(0x0080,0x0000); 
159     Write_Cmd_Data(0x0081,0x0000); 
160     Write_Cmd_Data(0x0082,0x0000); 
161     Write_Cmd_Data(0x0083,0x0000); 
162     Write_Cmd_Data(0x0084,0x0000); 
163     Write_Cmd_Data(0x0085,0x0000); 
164     //
165     Write_Cmd_Data(0x0090,0x0010); 
166     Write_Cmd_Data(0x0092,0x0600); 
167     Write_Cmd_Data(0x0093,0x0003); 
168     Write_Cmd_Data(0x0095,0x0110); 
169     Write_Cmd_Data(0x0097,0x0000); 
170     Write_Cmd_Data(0x0098,0x0000);
171     Write_Cmd_Data(0x0007,0x0133);
172     
173     //    Write_Cmd_Data(0x0022);//        
174 }
175 
176 /*----------------------------------------------------------------
177                          设置坐标
178 ----------------------------------------------------------------*/
179 /*----------------------------------------------------------------
180                             全局变量
181 ----------------------------------------------------------------*/
182 #define WINDOW_XADDR_START    0x0050 // Horizontal Start Address Set
183 #define WINDOW_XADDR_END    0x0051 // Horizontal End Address Set
184 #define WINDOW_YADDR_START    0x0052 // Vertical Start Address Set
185 #define WINDOW_YADDR_END    0x0053 // Vertical End Address Set
186 #define GRAM_XADDR            0x0020 // GRAM Horizontal Address Set
187 #define GRAM_YADDR            0x0021 // GRAM Vertical Address Set
188 #define GRAMWR                 0x0022 // memory write
189 void LCD_SetPos(unsigned int x0,unsigned int x1,unsigned int y0,unsigned int y1)
190 {
191     Write_Cmd_Data(WINDOW_XADDR_START,x0);
192     Write_Cmd_Data(WINDOW_XADDR_END,x1);
193     Write_Cmd_Data(WINDOW_YADDR_START,y0);
194     Write_Cmd_Data(WINDOW_YADDR_END,y1);
195     Write_Cmd_Data(GRAM_XADDR,x0);
196     Write_Cmd_Data(GRAM_YADDR,y0);
197     Write_Cmd (0x00,0x22);//LCD_WriteCMD(GRAMWR);
198 }
199 
200 /*----------------------------------------------------------------
201                             显示RGB颜色
202 输入参数:x0,y0 起始坐标
203           x1,y1 结束坐标
204           Color  背景颜色
205 ----------------------------------------------------------------*/
206 void Show_RGB (unsigned int x0,unsigned int x1,unsigned int y0,unsigned int y1,unsigned int Color)
207 {
208     unsigned int i,j;
209     LCD_SetPos(x0,x1,y0,y1);
210     LCD2_CS=0;
211     LCD2_RS=1;
212 //    for (i=y0;i<=y1;i++)
213 //    {
214 //       for (j=x0;j<=x1;j++)
215 //           Write_Data_U16(Color);
216 //    }
217     
218     for (i=0;i<=(y1-y0+1)*(x1-x0+1);i+=32)
219     {
220          Write_Data_U16(Color);
221          Write_Data_U16(Color);
222         Write_Data_U16(Color);
223          Write_Data_U16(Color);
224          Write_Data_U16(Color);
225          Write_Data_U16(Color);
226         Write_Data_U16(Color);
227          Write_Data_U16(Color);
228         Write_Data_U16(Color);
229          Write_Data_U16(Color);
230         Write_Data_U16(Color);
231          Write_Data_U16(Color);
232          Write_Data_U16(Color);
233          Write_Data_U16(Color);
234         Write_Data_U16(Color);
235          Write_Data_U16(Color);
236          Write_Data_U16(Color);
237          Write_Data_U16(Color);
238         Write_Data_U16(Color);
239          Write_Data_U16(Color);
240          Write_Data_U16(Color);
241          Write_Data_U16(Color);
242         Write_Data_U16(Color);
243          Write_Data_U16(Color);
244         Write_Data_U16(Color);
245          Write_Data_U16(Color);
246         Write_Data_U16(Color);
247          Write_Data_U16(Color);
248          Write_Data_U16(Color);
249          Write_Data_U16(Color);
250         Write_Data_U16(Color);
251          Write_Data_U16(Color);
252     }
253         LCD2_CS=1;
254 }
255 
256 
257 void Delay_ms(u16 time)
258 {
259     u16 i=0;  
260     while(time--)
261     {
262         i=12000; 
263         while(i--);    
264     }
265 }

注:代码比较容易理解,不做详解

 

另外补上这三个小实验的连线图:

1、这个是本节的并行接口与屏幕的连接方式:

[stm32] 一个简单的stm32vet6驱动2.4寸240X320的8位并口tft屏DEMO_第2张图片

2、这是上两节串行接口的连线,上面对应的引脚连接是与nRF51822的(第一次试验),下面对应的连接是与stm32的(第二次试验)

[stm32] 一个简单的stm32vet6驱动2.4寸240X320的8位并口tft屏DEMO_第3张图片

 

小结

从效果图上看,即使采用stm32的8位并行来驱动屏幕速度还是达不到刷新动画的效果~

之后我也传输数据的函数上做了些优化,可效果还是不明显——

第一点:优化前RS等引脚的定义要通过宏展开,每次计算BitBand后面的式子~

1 #define BitBand(Addr, Bit) *((volatile int*)(((int)(Addr) & 0x60000000) + 0x02000000 + (int)(Addr) * 0x20 + (Bit) * 4))
2 #define LCD2_CS         BitBand(&GPIOB->ODR, 8)
3 #define LCD2_RES        BitBand(&GPIOB->ODR, 9)
4 #define LCD2_RS         BitBand(&GPIOB->ODR, 7)
5 #define LCD2_RW         BitBand(&GPIOB->ODR, 6)
6 #define DataPort         GPIOD->ODR

优化后采用直接把值赋给对应的引脚来减少运算量

1 #define BitBand(Addr, Bit) *((volatile int*)(((int)(Addr) & 0x60000000) + 0x02000000 + (int)(Addr) * 0x20 + (Bit) * 4))
2 #define LCD2_CS         (*((volatile int*)0x422181A0))   //BitBand(&GPIOB->ODR, 8)
3 #define LCD2_RES        (*((volatile int*)0x422181A4))   //BitBand(&GPIOB->ODR, 9)
4 #define LCD2_RS         (*((volatile int*)0x4221819C))   //BitBand(&GPIOB->ODR, 7)
5 #define LCD2_RW         (*((volatile int*)0x42218198))   //BitBand(&GPIOB->ODR, 6)
6 #define DataPort         (*((volatile int*)0x4001140C)) //GPIOD->ODR

第二点:为了减少Show_RGB函数中循环中的Write_Data_U16的调用,直接将Write_Data_U16计算拆到最细放到循环内

[stm32] 一个简单的stm32vet6驱动2.4寸240X320的8位并口tft屏DEMO_第4张图片

第三点:为了排除Write_Data_U16中4、5两行移位运算和类型转换所带来的时间花销,直接采用上图中全局变量color1、color2来直接赋值,查看效果有没有提升~

1 void  Write_Data_U16(unsigned int y)
2 {
3     unsigned char m,n;
4     m=y>>8;
5     n=y;
6     Write_Data2(m,n);
7 }

本篇中资源链接:http://pan.baidu.com/s/1bnjw1Fh

注:其中未优化版工程比较简洁方便理解学习,优化测试版是为了提升传输速率做的几点优化(效果不大,代码稍乱)

 

 

 

@beautifulzzzz 

  2015-11-28 持续更新中~

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