【极海APM32F407】8. 硬件IIC驱动OLED

hehung

【极海APM32F407】8. 硬件IIC驱动OLED [复制链接]

<div class='showpostmsg'><i class="pstatus"> 本帖最后由 hehung 于 2023-7-1 18:54 编辑 </i>

# 前言

本文讲解如何使用APM32F407的硬件I2C来驱动OLED屏幕。使用了I2C1。

# 1 硬件连接

查看数据手册，可以知道引脚的复用关系，如下图所示，可以复用为I2C的引脚有多组，我们选择PB6和PB7。

- PB6 - SCL
- PB7 - SDA

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关于OLED就不多做介绍了，可以查看相关资料，OLED的7为I2C地址为0x3C。

# 2软件编写

## 2.1 I2C驱动功能

app_hw_i2c.c

```c
/*
@hehung
2023-6-30
email: 1398660197@qq.com
wechat: hehung95
reproduced and please indicate the source @hehung
*/

#include "app_hw_i2c.h"
#include "main.h"
#include "Board.h"
#include <stdio.h>

#define I2CT_FLAG_TIMEOUT   ((uint32_t)0x500)
#define I2CT_LONG_TIMEOUT   ((uint32_t)(10 * I2CT_FLAG_TIMEOUT))

static uint8_t i2c1_slave_addr = 0x00;

static uint32_t I2C_TIMEOUT_UserCallback(uint8_t errorCode)
{
  printf("I2C Wait TIMEOUT! errorCode = %d\r\n", errorCode);

return 0;
}

/* Initialize for I2c driver */
void I2c_Init(void)
{
  GPIO_Config_T gpioConfigStruct;
  I2C_Config_T i2cConfigStruct;

/* Enable I2C related Clock */
  RCM_EnableAHB1PeriphClock(RCM_AHB1_PERIPH_GPIOB);
  RCM_EnableAPB1PeriphClock(RCM_APB1_PERIPH_I2C1);

/* Free I2C_SCL and I2C_SDA */
  GPIO_ConfigPinAF(GPIOB, GPIO_PIN_SOURCE_6, GPIO_AF_I2C1);
  GPIO_ConfigPinAF(GPIOB, GPIO_PIN_SOURCE_7, GPIO_AF_I2C1);

gpioConfigStruct.mode = GPIO_MODE_AF;
  gpioConfigStruct.speed = GPIO_SPEED_50MHz;
  gpioConfigStruct.pin = GPIO_PIN_6 | GPIO_PIN_7;
  gpioConfigStruct.otype = GPIO_OTYPE_OD;
  gpioConfigStruct.pupd = GPIO_PUPD_NOPULL;
  GPIO_Config(GPIOB, &gpioConfigStruct);

/*Config I2C1 */
  I2C_Reset(I2C1);
  i2cConfigStruct.mode = I2C_MODE_I2C;
  i2cConfigStruct.dutyCycle = I2C_DUTYCYCLE_2;
  i2cConfigStruct.ackAddress = I2C_ACK_ADDRESS_7BIT;
  i2cConfigStruct.ownAddress1 = 0XA0;
  i2cConfigStruct.ack = I2C_ACK_ENABLE;
  i2cConfigStruct.clockSpeed = 400000;
  I2C_Config(I2C1, &i2cConfigStruct);

I2C_DisableDualAddress(I2C1);

/* Enable I2Cx */
  I2C_Enable(I2C1);
}

void I2c_SetSlaveAddr(uint8_t slave_addr)
{
    i2c1_slave_addr = slave_addr;
}

uint8_t I2c_WriteData(uint8_t *pBuffer, uint8_t len)
{
    uint16_t I2CTimeout = I2CT_LONG_TIMEOUT;
    uint8_t i;

/* Send START condition */
  I2C_EnableGenerateStart(I2C1);

I2CTimeout = I2CT_FLAG_TIMEOUT;

while (!I2C_ReadEventStatus(I2C1, I2C_EVENT_MASTER_MODE_SELECT))//EV5
  {
  if ((I2CTimeout--) == 0)
  {
    return I2C_TIMEOUT_UserCallback(5);
  }
  }

/* Send address for write */
  I2C_Tx7BitAddress(I2C1, i2c1_slave_addr, I2C_DIRECTION_TX);

I2CTimeout = I2CT_FLAG_TIMEOUT;

while (!I2C_ReadEventStatus(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))//EV6
  {
  if ((I2CTimeout--) == 0)
  {
    return I2C_TIMEOUT_UserCallback(6);
  }
  }

/* While there is data to be written */
    for (i=0; i< len; i++)
    {
        I2CTimeout = I2CT_FLAG_TIMEOUT;

/* Send the current byte */
        I2C_TxData(I2C1, pBuffer<i>);
    
        if (i < len-1)
        {
            while (!I2C_ReadEventStatus(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTING)) //EV8
            {
                if ((I2CTimeout--) == 0)
                {
                    return I2C_TIMEOUT_UserCallback(8);
                }
            }        
        }
        else
        {
            while (!I2C_ReadEventStatus(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) //EV8-2
            {
                if ((I2CTimeout--) == 0)
                {
                    return I2C_TIMEOUT_UserCallback(9);
                }
            }
            I2C_EnableGenerateStop(I2C1);
        }

}

return 1;
}

```

app_hw_i2c.h

```c
/*
@hehung
2023-6-30
email: 1398660197@qq.com
wechat: hehung95
reproduced and please indicate the source @hehung
*/

#ifndef APP_HW_I2C_H_
#define APP_HW_I2C_H_

#include <stdint.h>

extern void I2c_Init(void);
extern void I2c_SetSlaveAddr(uint8_t slave_addr);
extern uint8_t I2c_WriteData(uint8_t *pBuffer, uint8_t len);

#endif /* APP_HW_I2C_H_ */

```

## 2.2 OLED驱动函数

下面的驱动代码只包含了操作硬件IIC的代码，其他代码可以见附件下载查看，谢谢。

```c
/*********************OLED写数据函数************************************/
void OLED_WrDat(unsigned char IIC_Data)
{
    uint8_t i2c_transmitter[2]={0x40, IIC_Data};

I2c_SetSlaveAddr(OLED_I2C_SLAVE_ADDR_7BIT);
    I2c_WriteData(&i2c_transmitter[0], 2);
}

/*********************OLED写命令函数************************************/
void OLED_WrCmd(unsigned char IIC_Command)
{
    uint8_t i2c_transmitter[2]={0x00, IIC_Command};

I2c_SetSlaveAddr(OLED_I2C_SLAVE_ADDR_7BIT);
    I2c_WriteData(&i2c_transmitter[0], 2);
}
```

## 2.3 主函数

如下主函数调用驱动OLED的代码实现显示功能。

```c
  I2c_Init();
  /* initialize the OLED */
  OLED_Init();

OLED_ShowHzStringRow(30, 0, (const char*)"极海", 1);
  OLED_ShowString(62, 0, (const uint8_t*)"APM32", 16, 1);
  OLED_ShowHzStringRow(32, 24, (const char*)"电子工程世界", 1);
  OLED_ShowString(64, 48, (const uint8_t*)"--hehung", 16, 1);
  OLED_Refresh_Gram();
```

# 3 显示效果展示

见下图成功显示中文和英文。

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全家福

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# 4 附件代码

如下附件为驱动IIC_OLED的代码，供参考。

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【极海APM32F407】8. 硬件IIC驱动OLED [复制链接]

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