基于ILI9341液晶屏+STM32U5单片的显示试验

试验要求：

1、通过串口，下发两个命令 STR和PIC；

2、STR模式：

        （1）串口输入什么，屏幕上显示什么

        （2）如果屏幕满，自动下滚

        （3）输入回车，进行换行

        （4）输入PIC切换到PIC模式

3、PIC模式：

        （1）快速连续播放内置的单片机图片（以达到动图效果）

        （2）串口输入STR切换至STR模式 

1、运行效果展示

1.1 STR模式（最终运行效果）

串口输入：

LCD液晶屏显示：

2.1 PIC模式（GIF图片效果，并非最终运行效果）

1、配置工程

1.1、通过原理图找对应的功能引脚（SPI+UART）

spi：

uart：

1.2、配置spi和uart

略。

1.3、找ILI9341驱动库并修改

主要是注意修改对应的管脚功能，例如下图，需要改成实际使用的管脚。

2、STR模式的准备工作

2.1、字模原理及验证

原理：通过以下网址学习

26. LCD—液晶显示中英文 — [野火]STM32 HAL库开发实战指南——基于F103系列开发板 文档

通过工具生成的字符A和B的字模：

/* 16X32的字模: 大写 */
unsigned char capLetterSet[2][64]={{// A 0x41  //0x00,0x00,0x00,0x00,0x01,0x80,0x03,0x80,0x02,0xC0,0x02,0xC0,0x06,0xC0,0x04,0xE0,0x04,0x60,0x04,0x60,0x04,0x60,0x0C,0x70,0x08,0x30,0x08,0x30,0x08,0x30,0x1F,0xF8,0x10,0x18,0x10,0x18,0x10,0x18,0x10,0x18,0x10,0x1C,0x30,0x0C,0x20,0x0C,0x20,0x0C,0x60,0x0E,0xF8,0x3F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},{// B 0x42 //0x00,0x00,0x00,0x00,0x3F,0xE0,0x18,0x38,0x18,0x18,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x18,0x18,0x30,0x1F,0xE0,0x18,0x30,0x18,0x18,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x1C,0x18,0x38,0x3F,0xF0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}
};

普通的C工程验证：

 

void Printf_Charater(unsigned char* matrix, int matrixLen)
{int i,j;unsigned char kk;/*i用作行计数*/for ( i=0; i<32; i++) {/*j用作一字节内数据的移位计数*//*一行像素的第一个字节*/for (j=0; j<8; j++) {/*一个数据位一个数据位地处理*/kk = matrix[2*i] << j ;  //左移J位if ( kk & 0x80) {printf("*"); //如果最高位为1，输出*号，表示笔迹} else {printf(" "); //如果最高位为0，输出空格，表示空白}}/*一行像素的第二个字节*/for (j=0; j<8; j++) {kk = matrix[2*i+1] << j ;  //左移J位if ( kk & 0x80) {printf("*"); //如果最高位为1，输出*号，表示笔迹} else {printf(" "); //如果最高位为0，输出空格，表示空白}}printf("\n");    //输出完一行像素，换行}printf("\n\n");     //一个字输出完毕
}void screen_print(char* str){for(int i=0;str[i]!=0;i++){char ch=str[i];unsigned char *charater_matrix=capLetterSet[ch-'A'];Printf_Charater(charater_matrix, 64);}
}

结论：本试验中采用16x32的字模。按照我的理解，就是把对应的字符转换成字模，液晶屏显示是，以16位为1行，每位代表这个像素点显示还是不显示(1-显示，0-不显示)，共32行。本案例中，每个字节的高位代表较小的列号(MSP)

3、源码

3.1、main.c

int fputc(int ch, FILE * fp){HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, 10);return ch;
}char uart_buff[128]={0};
int uart_buff_index=0;
char uart_ch;
typedef enum{MODE_STR,MODE_PIC
}mode_t;
mode_t mode;extern unsigned char gImages[5][153600];void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart){//只处理串叿 1 的数据中斿if(huart != &huart1){HAL_UART_Receive_IT(&huart1, (uint8_t*)&uart_ch, 1);return;}uart_buff[uart_buff_index++]=uart_ch;printf("%c",uart_ch);if(uart_ch != '\r'){HAL_UART_Receive_IT(&huart1, (uint8_t*)&uart_ch, 1);return;}uart_buff[uart_buff_index-1]=0;//将\r替换成\0printf("串口收到数据:[%s],uart_buff_index=[%d]!!!\n\r", uart_buff, uart_buff_index);uart_buff_index=0;//重新计数if(strcmp("STR", uart_buff)==0){//字符串模式 STRprintf("当前模式:STR(字符串显示模式(STR)\n\r");HAL_UART_Receive_IT(&huart1, (uint8_t*)&uart_ch, 1);mode = MODE_STR;//清屏return;}if(strcmp("PIC", uart_buff)==0){//图片模式printf("当前模式:PIC(图片显示模式)\n\r");HAL_UART_Receive_IT(&huart1, (uint8_t*)&uart_ch, 1);//mode = MODE_PIC;//清屏return;}if(mode == MODE_STR){//显示uart_buff的内容，并且换行printf("STR模式调用, uart_buff=[%s]\n\r", uart_buff);LCD_str_print(uart_buff);LCD_str_print("\n");}//HAL_UART_Receive_IT(&huart1, (uint8_t*)&uart_ch, 1);
}int main(void)
{HAL_Init();SystemClock_Config();SystemPower_Config();MX_GPIO_Init();MX_ICACHE_Init();MX_USART1_UART_Init();MX_SPI1_Init();/* USER CODE BEGIN 2 */ILI9341_Init();	HAL_UART_Receive_IT(&huart1, (uint8_t*)&uart_ch, 1);int i=0;while (1){if(mode == MODE_PIC){//图片显示模式LCD_picture(gImages[i%5]);i++;HAL_Delay(25);}else{HAL_Delay(1000);}}
}/* 其他代码是cube自动生成的，略... */

3.2、LCD_font.c 字模集合(26个大写英文字母、*和空格)

#include "LCD_str.h"unsigned char starMatrix[64]={//*0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x00,0x80,0x00,0x80,// * //0x00,0x80,0x00,0x80,0x00,0x80,0x40,0x81,0x20,0x82,0x10,0x84,0x08,0x88,0x04,0x90,0x02,0xA0,0x01,0xC0,0x02,0x20,0x04,0x10,0x08,0x08,0x10,0x04,0x20,0x02,0x40,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
};unsigned char spaceMatrix[64]={//空格0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
};unsigned char font_lowChSet[26][64]={//A-0x41{0x00,0x00,0x00,0x00,0x01,0x80,0x03,0x80,0x02,0xC0,0x02,0xC0,0x06,0xC0,0x04,0xE0,// A //0x04,0x60,0x04,0x60,0x04,0x60,0x0C,0x70,0x08,0x30,0x08,0x30,0x08,0x30,0x1F,0xF8,0x10,0x18,0x10,0x18,0x10,0x18,0x10,0x18,0x10,0x1C,0x30,0x0C,0x20,0x0C,0x20,0x0C,0x60,0x0E,0xF8,0x3F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x3F,0xE0,0x18,0x38,0x18,0x18,0x18,0x0C,0x18,0x0C,0x18,0x0C,// B //0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x18,0x18,0x30,0x1F,0xE0,0x18,0x30,0x18,0x18,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x1C,0x18,0x38,0x3F,0xF0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x03,0xE4,0x07,0x34,0x0E,0x1C,0x1C,0x0C,0x18,0x06,0x38,0x06,// C //0x38,0x02,0x30,0x02,0x30,0x00,0x30,0x00,0x30,0x00,0x30,0x00,0x30,0x00,0x30,0x00,0x30,0x00,0x30,0x00,0x30,0x00,0x30,0x02,0x38,0x02,0x18,0x06,0x18,0x04,0x0E,0x0C,0x07,0x38,0x03,0xF0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x3F,0xE0,0x18,0x30,0x18,0x18,0x18,0x1C,0x18,0x0C,0x18,0x0C,// D //0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x1C,0x18,0x18,0x18,0x30,0x3F,0xE0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x3F,0xFC,0x18,0x0C,0x18,0x04,0x18,0x04,0x18,0x00,0x18,0x00,// E //0x18,0x00,0x18,0x00,0x18,0x08,0x18,0x08,0x18,0x18,0x1F,0xF8,0x18,0x18,0x18,0x08,0x18,0x08,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x04,0x18,0x04,0x18,0x0C,0x3F,0xFC,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x3F,0xFC,0x18,0x0C,0x18,0x06,0x18,0x06,0x18,0x02,0x18,0x00,// F //0x18,0x00,0x18,0x00,0x18,0x08,0x18,0x08,0x18,0x18,0x1F,0xF8,0x18,0x18,0x18,0x08,0x18,0x08,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x3C,0x00,0x7E,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x03,0xE4,0x07,0x34,0x0E,0x1C,0x1C,0x0C,0x18,0x06,0x38,0x06,// G //0x30,0x02,0x30,0x02,0x30,0x00,0x30,0x00,0x30,0x00,0x30,0x00,0x30,0x00,0x30,0x00,0x30,0x3F,0x30,0x0E,0x30,0x0E,0x30,0x0E,0x38,0x0E,0x18,0x0E,0x1C,0x0E,0x0E,0x1E,0x07,0x30,0x03,0xE0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x3E,0x3E,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,// H //0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x1F,0xFC,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x3C,0x1E,0x7E,0x3F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x0F,0xF0,0x03,0xC0,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,// I //0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x03,0xC0,0x0F,0xF0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x0F,0xFC,0x01,0xE0,0x00,0xC0,0x00,0xC0,0x00,0xC0,0x00,0xC0,// J //0x00,0xC0,0x00,0xC0,0x00,0xC0,0x00,0xC0,0x00,0xC0,0x00,0xC0,0x00,0xC0,0x00,0xC0,0x00,0xC0,0x00,0xC0,0x00,0xC0,0x00,0xC0,0x00,0xC0,0x60,0xC0,0x70,0xC0,0x70,0xC0,0x39,0x80,0x1F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x3E,0x3E,0x18,0x18,0x18,0x10,0x18,0x20,0x18,0x20,0x18,0x40,// K //0x18,0x40,0x18,0x80,0x18,0x80,0x19,0x00,0x1E,0x00,0x1F,0x00,0x1B,0x80,0x19,0x80,0x18,0xC0,0x18,0xC0,0x18,0x60,0x18,0x70,0x18,0x30,0x18,0x18,0x18,0x1C,0x18,0x0C,0x18,0x0E,0x3E,0x3F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x7F,0x00,0x3C,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,// L //0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x04,0x18,0x04,0x18,0x0C,0x18,0x1C,0x3F,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x78,0x07,0x38,0x0E,0x38,0x0E,0x38,0x0E,0x34,0x16,0x34,0x16,// M //0x34,0x16,0x36,0x36,0x32,0x26,0x32,0x26,0x32,0x26,0x33,0x66,0x31,0x46,0x31,0x46,0x31,0x46,0x31,0xC6,0x30,0x86,0x30,0x86,0x30,0x06,0x30,0x06,0x30,0x06,0x30,0x06,0x30,0x06,0x78,0x0F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x3C,0x1E,0x1C,0x0C,0x1C,0x0C,0x1C,0x0C,0x1E,0x0C,0x1A,0x0C,// N //0x1A,0x0C,0x1B,0x0C,0x19,0x0C,0x19,0x0C,0x19,0x8C,0x18,0x8C,0x18,0x8C,0x18,0xCC,0x18,0x4C,0x18,0x4C,0x18,0x6C,0x18,0x2C,0x18,0x2C,0x18,0x3C,0x18,0x1C,0x18,0x1C,0x18,0x1C,0x3C,0x1E,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x07,0xE0,0x18,0x18,0x30,0x0C,0x60,0x06,0x60,0x06,0x60,0x06,// O //0x60,0x06,0x60,0x06,0x60,0x06,0x60,0x06,0x60,0x06,0x60,0x06,0x60,0x06,0x60,0x06,0x60,0x06,0x60,0x06,0x60,0x06,0x60,0x06,0x60,0x06,0x60,0x06,0x60,0x06,0x30,0x0C,0x18,0x18,0x07,0xE0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x3F,0xF0,0x18,0x38,0x18,0x1C,0x18,0x0C,0x18,0x0C,0x18,0x0C,// P //0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x1C,0x18,0x38,0x1F,0xF0,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x18,0x00,0x3C,0x00,0x7E,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x03,0xC0,0x0E,0x70,0x1C,0x38,0x18,0x18,0x30,0x0C,0x30,0x0C,// Q //0x30,0x0C,0x30,0x0C,0x30,0x0C,0x30,0x0C,0x30,0x0C,0x30,0x0C,0x30,0x0C,0x30,0x0C,0x30,0x0C,0x30,0x0C,0x30,0x0C,0x30,0x0C,0x33,0xCC,0x36,0x6C,0x1C,0x38,0x1C,0x39,0x0E,0x79,0x03,0xCF,0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x3F,0xF0,0x18,0x38,0x18,0x1C,0x18,0x0C,0x18,0x0C,0x18,0x0C,// R //0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x1C,0x18,0x38,0x1F,0xE0,0x19,0xC0,0x18,0xE0,0x18,0xE0,0x18,0x70,0x18,0x70,0x18,0x38,0x18,0x38,0x18,0x1C,0x18,0x1C,0x18,0x0E,0x3C,0x0E,0x7E,0x1F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x03,0xE4,0x0E,0x74,0x1C,0x1C,0x18,0x0C,0x30,0x06,0x30,0x02,// S //0x30,0x02,0x38,0x00,0x18,0x00,0x1E,0x00,0x0F,0x00,0x03,0xC0,0x01,0xE0,0x00,0x70,0x00,0x38,0x00,0x1C,0x00,0x0C,0x40,0x0C,0x40,0x0C,0x60,0x0C,0x30,0x1C,0x38,0x38,0x2E,0x70,0x27,0xE0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x3F,0xFC,0x31,0x8C,0x21,0x84,0x61,0x86,0x41,0x82,0x01,0x80,// T //0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x01,0x80,0x03,0xC0,0x07,0xE0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x7E,0x1F,0x3C,0x0E,0x18,0x04,0x18,0x04,0x18,0x04,0x18,0x04,// U //0x18,0x04,0x18,0x04,0x18,0x04,0x18,0x04,0x18,0x04,0x18,0x04,0x18,0x04,0x18,0x04,0x18,0x04,0x18,0x04,0x18,0x04,0x18,0x04,0x18,0x04,0x18,0x04,0x18,0x04,0x0C,0x0C,0x06,0x18,0x03,0xF0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x7E,0x3F,0x38,0x0E,0x18,0x0C,0x18,0x0C,0x18,0x0C,0x18,0x0C,// V //0x0C,0x08,0x0C,0x08,0x0C,0x18,0x0C,0x10,0x0C,0x10,0x06,0x10,0x06,0x30,0x06,0x20,0x06,0x20,0x06,0x20,0x03,0x60,0x03,0x40,0x03,0x40,0x03,0x40,0x03,0xC0,0x01,0x80,0x01,0x80,0x01,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0xFB,0xEF,0x61,0x82,0x61,0x82,0x61,0x82,0x61,0x82,0x31,0x86,// W //0x31,0x84,0x31,0x84,0x31,0x84,0x31,0xC4,0x31,0xC4,0x31,0xC4,0x31,0x44,0x12,0x48,0x1A,0x48,0x1A,0x48,0x1A,0x48,0x1A,0x68,0x1A,0x68,0x0C,0x30,0x0C,0x30,0x0C,0x30,0x0C,0x30,0x0C,0x30,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0xFC,0x3F,0x70,0x0C,0x30,0x0C,0x38,0x08,0x18,0x10,0x1C,0x10,// X //0x0C,0x10,0x0E,0x20,0x06,0x20,0x07,0x40,0x03,0x40,0x03,0x80,0x01,0x80,0x01,0xC0,0x02,0xC0,0x02,0xC0,0x04,0x60,0x04,0x70,0x08,0x30,0x08,0x38,0x10,0x18,0x30,0x1C,0x30,0x0E,0xFE,0x3F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x78,0x1F,0x30,0x06,0x18,0x04,0x18,0x04,0x18,0x04,0x0C,0x08,// Y //0x0C,0x08,0x0C,0x08,0x06,0x10,0x06,0x10,0x03,0x20,0x03,0xE0,0x01,0xC0,0x01,0xC0,0x01,0xC0,0x01,0xC0,0x01,0xC0,0x01,0xC0,0x01,0xC0,0x01,0xC0,0x01,0xC0,0x01,0xC0,0x03,0xE0,0x0F,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{0x00,0x00,0x00,0x00,0x1F,0xFE,0x18,0x0C,0x10,0x0C,0x30,0x1C,0x20,0x18,0x20,0x18,// Z //0x00,0x38,0x00,0x30,0x00,0x70,0x00,0x60,0x00,0xE0,0x00,0xC0,0x00,0xC0,0x01,0xC0,0x01,0x80,0x03,0x80,0x03,0x00,0x07,0x00,0x06,0x02,0x0E,0x02,0x0C,0x06,0x1C,0x04,0x1C,0x0C,0x3F,0xFC,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,}};

3.3、LCD_str.c 字符和字符串的LCD打印

#include "LCD_str.h"
#include "bsp_ili9341_4line.h"
#include <stdio.h>void LCD_str_print(char* str){static int global_x=0;static int global_y=0;//for(int i=0;str[i]!=0;i++){if(str[i]=='\n'){global_x=0;global_y+=32;continue;}if(global_x+16 > 240){global_x=0;global_y+=32;}LCD_ch_show(global_x, global_y, str[i]);global_x+=16;}
}void LCD_ch_show(int start_x, int start_y, char ch){//获取对应字符的字模unsigned char* matrix;if(ch == ' '){//空格matrix = spaceMatrix;}else if(ch < 'A' || ch > 'Z'){matrix = starMatrix;}else{//A-Z之间matrix = font_lowChSet[ch-'A'];}//显示for(int row=0;row<32;row++){//16x32 每行2字节	从高位开始计数//第一个字符unsigned char mm=matrix[row*2];int col=0;for(col=0; col<8;col++){if(mm & 0x80){//显示 x在变， y没变，y代表row_HW_DrawPoint(col+start_x,row+start_y, GREEN);}mm <<= 1;}//第二个字符mm=matrix[row*2+1];for(col=8; col<16;col++){if(mm & 0x80){//显示 x在变， y没变，y代表row_HW_DrawPoint(col+start_x,row+start_y, GREEN);}mm <<= 1;}}}

3.4、LCD图片打印相关函数代码

void LCD_picture(unsigned char* pic)
{uint8_t temp[2] = {};//1. 给 ILI9341寄存器 写入 写数据命令ILI9341_WR_REG(0x2C);//屏幕中, 一个像素点占用两个字节uint32_t len = 2*240*320;uint32_t i = 0;while(i < len){temp[0] = pic[i];temp[1] = pic[i+1];HAL_SPI_Transmit(&hspi1,temp,2,0);i = i+2;}
}void LCD_pictures(unsigned char (*pics)[153600], int picPages)
{unsigned int i=0;while(1){LCD_picture(pics[i%picPages]);i++;}
}

4、小结

关于原理图：SPI的转接板的序号并没有对上，不知道是原理图有错还是我的查找方法不正确。

关于字模：

        （1）本试验采用的16x32的字模，若是需要更小或更大的字体，需要重新生成字模或者通过某种算法扩展；

        （2）本试验仅支持A-Z的大写字母，如果需要更多的字符需要重新生成字模；

        （3）多字节的字符，例如中文，应该需要某种算法来找到对应的字模矩阵，没研究。

关于cube：关于cubeMax，重新生成导入到keil中，可能会有中文的乱码。还不知道怎么解决

关于烧录程序：本次的试验，用到的图片和字模都比较占用空间，目前是直接写到.c文件中，这样的话会占用较多的栈空间。按我的理解，应该放到硬盘中(例如flash)，需要的时候再加载进来，单目前还不知道怎么使用flash。