[经验]

【RA4M2-SENSOR】2、I2C驱动OLED屏幕

VR小杰

2025-9-1 12:46:38

626 单片机

1 准备

（1）0.96寸OLED屏幕 128x64分辨率控制IC为SSD1306 I2C通信协议，如下图所示

（2）将上一次实验创建的模板工程复制一份，重命名为01_I2C_OLED

2 E2S 配置I2C

修改从机地址为0X3C以及中断优先级

3 软件部分

3.1 编写I2C回调及等待函数

在src目录下新建文件夹i2c，并继续新建i2c.c和i2c.h

i2c.c代码

#include "hal_data.h"
#include "i2c.h"

volatile bool i2c_rx_complete = false;
volatile bool i2c_tx_complete = false;
uint16_t timeout = 0;

void iic_callback(i2c_master_callback_args_t *p_args)
{
    if (p_args->event == I2C_MASTER_EVENT_RX_COMPLETE)
    {
        i2c_rx_complete = true;
    }
    else if (p_args->event == I2C_MASTER_EVENT_TX_COMPLETE)
    {
        i2c_tx_complete = true;
    }
}

void i2c_wait_tx()
{
    timeout = 1000;
    while (!i2c_tx_complete && timeout > 0)
    {
        timeout--;
    }
    i2c_tx_complete = false;
}

void i2c_wait_rx()
{
    timeout = 1000;
    while (!i2c_rx_complete && timeout > 0)
    {
        timeout--;
    }
    i2c_rx_complete = false;
}

i2c.h代码

#ifndef I2C_H_
#define I2C_H_

extern volatile bool i2c_rx_complete;
extern volatile bool i2c_tx_complete;

void i2c_wait_rx();
void i2c_wait_tx();
#endif

3.2 编写oled屏幕驱动代码

在src目录下新建文件夹oled，并继续新建oled.c、oled.h和oled_font.h文件

oled.c代码

oled.h代码

#ifndef OLED_H_
#define OLED_H_

#include "hal_data.h"

#define OLED_CMD 0  // 写命令
#define OLED_DATA 1 // 写数据
void OLED_ClearPoint(uint8_t x, uint8_t y);
void OLED_ColorTurn(uint8_t i);
void OLED_DisplayTurn(uint8_t i);
void OLED_WR_Byte(uint8_t dat, uint8_t mode);
void OLED_DisPlay_On(void);
void OLED_DisPlay_Off(void);
void OLED_Refresh(void);
void OLED_Clear(void);
void OLED_DrawPoint(uint8_t x, uint8_t y, uint8_t t);
void OLED_DrawLine(uint8_t x1, uint8_t y1, uint8_t x2, uint8_t y2, uint8_t mode);
void OLED_DrawCircle(uint8_t x, uint8_t y, uint8_t r);
void OLED_ShowChar(uint8_t x, uint8_t y, uint8_t chr, uint8_t size1);
void OLED_ShowString(uint8_t x, uint8_t y, uint8_t *chr, uint8_t size1);
void OLED_ShowNum(uint8_t x, uint8_t y, uint32_t num, uint8_t len, uint8_t size1);
void OLED_ShowChinese(uint8_t x, uint8_t y, uint8_t num, uint8_t size1);
void OLED_ScrollDisplay(uint8_t num, uint8_t space);
void OLED_ShowPicture(uint8_t x, uint8_t y, uint8_t sizex, uint8_t sizey, uint8_t BMP[], uint8_t mode);
void OLED_Init(void);

#endif

oled_font.h代码太长了，放不下，请见工程附件

3.3 hal_entry.c

在头文件部分新增一行

#include "oled/oled.h"

hal_entry函数如下

void hal_entry(void)
{
    /* TODO: add your own code here */
    UART_Init();
    R_SCI_I2C_Open(&g_i2c0_ctrl, &g_i2c0_cfg);
    OLED_Init();
    printf("Hello RA4M2-SENSOR开发板！\r\n");
    while(1){
        OLED_ShowString(24, 0, "hello world", 16);
    }
#if BSP_TZ_SECURE_BUILD
    /* Enter non-secure code */
    R_BSP_NonSecureEnter();
#endif
}