【XR806开发板试用】XR806移植U8G2到128*64单色屏基于硬件IIC

XR806移植U8G2到128*64单色屏基于硬件IIC

一、准备工作

能正常编译通过的环境
https://github.com/olikraus/u8g2 下载u8g2源码
下载单色屏的示例代码，淘宝商家那里找

二、移植开始

参考 https://blog.csdn.net/qq_43862401/article/details/121809470
在hello_demo一顿瞎比操作，oled目录是调试屏幕时候使用的淘宝代码，u8g2_lib是u8g2图形库代码，工程目录如下：

ohosdemo/BUILD.gn 内容如下：

group("ohosdemo") {
 deps = [
     "hello_demo:app_hello",
     #"iot_peripheral:app_peripheral",
     #"wlan_demo:app_WlanTest",
 ]
}

hello_demo/BUILD.gn 内容如下：

import("//device/xradio/xr806/liteos_m/config.gni")

static_library("app_hello") {
configs = []

sources = [
   "src/main.c",
   "src/test_i2c.c",
]

cflags = board_cflags

include_dirs = board_include_dirs
include_dirs += [
   "//kernel/liteos_m/kernel/arch/include",
   "include",
   "src/oled",
   "src/u8g2_lib",
   "//base/iot_hardware/peripheral/interfaces/kits",
]

deps = [
     "src:bsp_display",
 ]
}

main.c 内容如下：

#include <stdio.h>
#include "ohos_init.h"
#include "kernel/os/os.h"
#include "test_i2c.h"

static OS_Thread_t g_main_thread;

static void MainThread(void *arg)
{
 IotI2CTest();
 while (1) {
     printf("hello world!\n");
     LOS_Msleep(1000);
 }
}

void HelloTestMain(void)
{
 printf("Wifi Test Start\n");

 if (OS_ThreadCreate(&g_main_thread, "MainThread", MainThread, NULL,
             OS_THREAD_PRIO_APP, 50 * 1024) != OS_OK) {
     printf("[ERR] Create MainThread Failed\n");
 }
}

SYS_RUN(HelloTestMain);

test_i2c.c 内容如下：

#include <stdio.h>
#include <string.h>
#include "kernel/os/os.h"
#include "iot_i2c.h"
#include "oled.h"
#include "u8g2.h"

uint8_t u8x8_byte_hw_i2c(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr);
uint8_t u8g2_gpio_and_delay_stm32(U8X8_UNUSED u8x8_t *u8x8, U8X8_UNUSED uint8_t msg, U8X8_UNUSED uint8_t arg_int, U8X8_UNUSED void *arg_ptr);
void delay_ms(uint32_t ms);

void IotI2CTest(void)
{
 OLED_Init();
 OLED_Clear();
 OLED_ShowCHinese(0,0,0);
 OLED_ShowCHinese(18,0,1);
 OLED_ShowCHinese(36,0,2);
 OLED_ShowCHinese(54,0,3);
 OLED_ShowCHinese(72,0,4);
 OLED_ShowCHinese(90,0,5);
 OLED_ShowCHinese(108,0,6);

 u8g2_t u8g2;

 u8g2_Setup_sh1106_128x64_noname_f(&u8g2, U8G2_R0, u8x8_byte_hw_i2c, u8g2_gpio_and_delay_stm32);
 //u8g2_InitDisplay(&u8g2);
 u8g2_SetPowerSave(&u8g2, 0);
 u8g2_ClearDisplay(&u8g2);
 u8g2_SetFont(&u8g2, u8g2_font_wqy16_t_chinese1);
 u8g2_DrawCircle(&u8g2, 55, 30,  5,  U8G2_DRAW_ALL);
 u8g2_DrawCircle(&u8g2, 65, 30,  5,  U8G2_DRAW_ALL);
 u8g2_DrawCircle(&u8g2, 75, 30,  5,  U8G2_DRAW_ALL);
 u8g2_DrawUTF8(&u8g2, 20, 50, "你好, XR806!");
 u8g2_SendBuffer(&u8g2);
}

uint8_t u8g2_gpio_and_delay_stm32(U8X8_UNUSED u8x8_t *u8x8, U8X8_UNUSED uint8_t msg, U8X8_UNUSED uint8_t arg_int, U8X8_UNUSED void *arg_ptr)
{
 switch(msg)
 {
 case U8X8_MSG_GPIO_AND_DELAY_INIT:
 break;

 case U8X8_MSG_DELAY_MILLI:
     delay_ms(arg_int);
 break;

 default:
     return 0;
 }
 return 1;
}

uint8_t u8x8_byte_hw_i2c(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
 static uint8_t buffer[131];        /* u8g2/u8x8 will never send more than 32 bytes between START_TRANSFER and END_TRANSFER */
 static uint8_t buf_idx;
 uint8_t *data;

 switch(msg)
 {
 case U8X8_MSG_BYTE_SEND:
     data = (uint8_t *)arg_ptr;
     while( arg_int > 0 )
     {
     buffer[buf_idx++] = *data;
     data++;
     arg_int--;
     }
 break;

 case U8X8_MSG_BYTE_INIT:
     /* add your custom code to init i2c subsystem */
 break;

 case U8X8_MSG_BYTE_START_TRANSFER:
     buf_idx = 0;
 break;

 case U8X8_MSG_BYTE_END_TRANSFER:
     if (buf_idx != 132)
     {
         for (uint8_t i = 0; i < buf_idx; i++)
         {
             OLED_WR_Byte(buffer[i], OLED_CMD);
         }
     }
     else
     {
         for (uint8_t i = 1; i < 4; i++)
         {
             OLED_WR_Byte(buffer[i], OLED_CMD);
         }

         for (uint8_t i = 4; i < buf_idx; i++)
         {
             OLED_WR_Byte(buffer[i], OLED_DATA);
         }
     }
 break;

 default:
     return 0;
 }
 return 1;
}

void delay_ms(uint32_t ms)
{
 uint16_t i,  j;

 for (i = 0; i < ms; i++)
 {
     for (j = 0; j < 10; j++)
     {
         __asm("nop");
     }
 }
}

这里要说几个事：
1、没有使用u8g2_InitDisplay(&u8g2);初始化寄存器，好像值不对
2、移植U8X8_MSG_BYTE_END_TRANSFER分支的时候，发现不能区分是数据还是命令，我不知道其他大佬是怎么实现的，或者u8g2库有实现，但是我自己没找到使用方法，我的取巧：不是132长度的数据一律是写命令，132长度的1 2 3字节是写命令，后面的是写数据

src/BUILD.gn 内容如下

static_library("bsp_display") {
 sources = [
   "oled/oled.c",
   "u8g2_lib/mui.c",
   "u8g2_lib/mui_u8g2.c",
   "u8g2_lib/u8g2_bitmap.c",
   "u8g2_lib/u8g2_box.c",
   "u8g2_lib/u8g2_buffer.c",
   "u8g2_lib/u8g2_button.c",
   "u8g2_lib/u8g2_circle.c",
   "u8g2_lib/u8g2_cleardisplay.c",
   "u8g2_lib/u8g2_d_memory.c",
   "u8g2_lib/u8g2_d_setup.c",
   "u8g2_lib/u8g2_font.c",
   "u8g2_lib/u8g2_fonts.c",
   "u8g2_lib/u8g2_hvline.c",
   "u8g2_lib/u8g2_input_value.c",
   "u8g2_lib/u8g2_intersection.c",
   "u8g2_lib/u8g2_kerning.c",
   "u8g2_lib/u8g2_line.c",
   "u8g2_lib/u8g2_ll_hvline.c",
   "u8g2_lib/u8g2_message.c",
   "u8g2_lib/u8g2_polygon.c",
   "u8g2_lib/u8g2_selection_list.c",
   "u8g2_lib/u8g2_setup.c",
   "u8g2_lib/u8log.c",
   "u8g2_lib/u8log_u8g2.c",
   "u8g2_lib/u8log_u8x8.c",
   "u8g2_lib/u8x8_8x8.c",
   "u8g2_lib/u8x8_byte.c",
   "u8g2_lib/u8x8_cad.c",
   "u8g2_lib/u8x8_capture.c",
   "u8g2_lib/u8x8_d_a2printer.c",
   "u8g2_lib/u8x8_d_ssd1306_128x64_noname.c",
   "u8g2_lib/u8x8_debounce.c",
   "u8g2_lib/u8x8_display.c",
   "u8g2_lib/u8x8_fonts.c",
   "u8g2_lib/u8x8_gpio.c",
   "u8g2_lib/u8x8_input_value.c",
   "u8g2_lib/u8x8_message.c",
   "u8g2_lib/u8x8_selection_list.c",
   "u8g2_lib/u8x8_setup.c",
   "u8g2_lib/u8x8_string.c",
   "u8g2_lib/u8x8_u16toa.c",
   "u8g2_lib/u8x8_u8toa.c",
 ]

 include_dirs = [
   "//utils/native/lite/include",
   "//kernel/liteos_m/components/bounds_checking_function/include",
   "//kernel/liteos_m/kernel/include",
   "//kernel/liteos_m/utils",
   "//kernel/liteos_m/kal/cmsis",
   "//base/iot_hardware/peripheral/interfaces/kits",
 ]
}

大佬们，这里问一句，这么多.c你们是怎么添加的，我是一个一个添加上去的，还怕添加漏了，人都干废了，如果几百个源文件，需要怎么操作呢？

最终的移植结果就是上面的代码，主要是参考别的大佬移植到STM32的文章，然后自己一步一步经过艰苦的调试，终于成功了

三、效果展示

没有视频，毕竟没做效果，只是移植图形库
效果1.jpg

四、最后说个事

为什么这个markdown会自动给我把'_'前面加一个'\'，知道的大佬说说。PS：每次编辑都有新的事故，头秃。

....................................................................................................................................

补充：IIC忘记贴了

写命令写数据

unsigned int i2c_id = 0;
unsigned char i2c_device_add = I2C_DEVICE_ADDR;

void Write_IIC_Command(unsigned char IIC_Command)
{
    uint8_t buff[3] = {0x00};

    buff[1] = IIC_Command;
//    IIC_Start();
//    Write_IIC_Byte(0x78);            //Slave address,SA0=0
//    Write_IIC_Byte(0x00);            //write command
//    Write_IIC_Byte(IIC_Command);
//    IIC_Stop();
    IoTI2cWrite(i2c_id, i2c_device_add, buff, 2);
}

void Write_IIC_Data(unsigned char IIC_Data)
{
    uint8_t buff[3] = {0x40};

    buff[1] = IIC_Data;
//    IIC_Start();
//    Write_IIC_Byte(0x78);            //D/C#=0; R/W#=0
//    Write_IIC_Byte(0x40);            //write data
//    Write_IIC_Byte(IIC_Data);
//    IIC_Stop();
    IoTI2cWrite(i2c_id, i2c_device_add, buff, 2);
}

初始化

IoTI2cInit(i2c_id, I2C_SPEED);

宏定义

#define I2C_SPEED (400000)
#define I2C_DEVICE_ADDR (0x3C)