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目录
  • 一、准备工作
  • 二、编译代码
  • 三、测试

6.I2C 驱动OLED屏幕测试

该教程演示如何通过开发板的I2C 驱动OLED屏幕

一、准备工作

  • 准备1块BearPi-Pico H3863开发板
  • 准备1块 I2C接口的128*64分辨率的OLED屏幕

二、编译代码

在Windows下编译操作

  1. 点击工具栏中的“系统配置”,打开配置界面.

    Alt text

  2. 选择Support I2C Sample.

    Application  --->
    [*] Enable Sample.
    [*]     Enable the Sample of peripheral.
    [ ]         Enable all the sample of peripheral, it's just for build.
    [ ]         Support ADC Sample.
    [ ]         Support BLINKY Sample.
    [ ]         Support BUTTON Sample.
    [*]         Support I2C Sample.
                    I2C Sample Configuration  --->

  3. 设置I2C主设备的I2C id和GPIO，id设置为1，GPIO设置为15和16。

    I2C Sample Configuration  --->
    [*] Support I2C Master Sample.
    (1)     Choose I2C master bus id. (NEW)
    (15)    Choose I2C SCL master pin. (NEW)
    (16)    Choose I2C SDA master pin. (NEW)

  4. 按下"Save"键保存配置。

    Alt text

  5. 关键代码，位于application\samples\peripheral\i2c\i2c_master_demo.c

    static void *i2c_master_task(const char *arg)
{
    unused(arg);

    uint32_t baudrate = I2C_SET_BAUDRATE;
    uint8_t hscode = I2C_MASTER_ADDR;

    /* I2C master init config. */

    app_i2c_init_pin();                                                   //设置引脚复用为I2C
    uapi_i2c_master_init(CONFIG_I2C_MASTER_BUS_ID, baudrate, hscode);     //初始化I2C  
    .....
    return NULL;
}

    static uint32_t ssd1306_SendData(uint8_t *buffer, uint32_t size)
{
    uint16_t dev_addr = I2C_SLAVE2_ADDR;
    i2c_data_t data = {0};
    data.send_buf = buffer;
    data.send_len = size;
    uint32_t retval = uapi_i2c_master_write(CONFIG_I2C_MASTER_BUS_ID, dev_addr, &data);  //发送I2C数据
    if (retval != 0) {
        printf("I2cWrite(%02X) failed, %0X!\n", data.send_buf[1], retval);
        return retval;
    }
    return 0;
}

  6. 编译烧录固件

    参考环境搭建教程编译烧录代码

三、测试

  1. 按以下接线方式将开发板与屏幕连接,点击运行点亮OLED屏幕程序,观察屏幕显示。

    开发板 ------------ 屏幕

    TXD ------------ SDA

    RXD ------------ SCL

    3V3 ------------ VCC

    GND ------------ GND

  2. 烧录固件后按下开发的复位按键，观察屏幕显示。

    Alt text