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通用型I2C接口的应用之综合应用（N32G45XVL-STB）

news 来源：原创 2024/9/19 10:11:23

概述

1 软硬件接口

1.1 硬件接口

1.2 开发软硬件信息

1.3 SHT-20模块电路

1.4 0.9寸OLED模块介绍

2 驱动接口实现

2.1 SHT20驱动接口

2.2 OLED驱动接口

3 应用接口实现

3.1 软件框架

3.2 sht2x I2C驱动调用

3.3 OLED I2C驱动调用

4 功能实现

4.1 功能介绍

4.2 代码实现

5 测试

5.1 测试代码实现

5.2 板卡运行代码

源代码下载地址：

通用性I2C接口的应用之驱动SHT20（N32G45XVL-STB）资源-CSDN文库

概述

本文主要应用通用型I2C接口的代码库，使用二组不同IO的pin，分别实现I2C功能，同时驱动SHT20X和OLED。在主函数中实时读取SHT20的数据，并将数据实时的显示在OLED屏幕上。温湿度的数据也通过串口log，发送至串口终端上。

1 软硬件接口

1.1 硬件接口

1) SHT20接口

MCU接口	SHT20	功能
PB6	SDA	I2C数据端口
PB7	SCL	I2C时钟接口

2) OLED接口

MCU接口	OLED	功能
PB12	SDA	I2C数据端口
PB11	SCL	I2C时钟接口

1.2 开发软硬件信息

软硬件信息	版本信息
N32G45x MCU	N32G457VEL7
Keil	MDK ARM 5.38
调试工具：CMSIS-DAP	NS-LINK

1.3 SHT-20模块电路

1）SHT20硬件接口图

2) sensor模块电路

1.4 0.9寸OLED模块介绍

笔者使用的0.9寸OLED模块，驱动芯片为SSD1306，该模块采用I2C驱动方式，对外有四个引脚：

1） GND: 电源地

2）VCC：电源正极，工作电压区间为3~5.5V

3）SCL: I2C 时钟引脚

4） SDA: I2C数据引脚

模块的原理图如下：

2 驱动接口实现

2.1 SHT20驱动接口

创建sht20x_port.c 文件实现如下代码：

/** \file$Id: sht20x_port.c 40486 2018-08-12 13:50:21Z tangmingfei2013@126.com $Copyright (c)tangmingfei2013@126.com Holding B.V.
All Rights Reserved.This source code and any compilation or derivative thereof is the proprietary
information of mingfei.tang Holding B.V. and is confidential in nature.
Under no circumstances is this software to be combined with any
Open Source Software in any way or placed under an Open Source License
of any type without the express written permission of mingfei.tang Holding B.V.
*/
/*******************************************************************************
* EXPORT INCLUDE FILES
*******************************************************************************/
#include "sht2x_port.h"/*******************************************************************************
* LOCAL INCLUDE FILES
*******************************************************************************/#define SHT2X_I2C_PORT_RCC_APB2         RCC_APB2_PERIPH_GPIOB
#define SHT2X_SCL_PIN                   GPIO_PIN_7
#define SHT2X_SDA_PIN                   GPIO_PIN_6
#define SHT2X_I2Cx_GPIOx                GPIOB#define I2C_SHT2X_SCL_1()             GPIO_SetBits(SHT2X_I2Cx_GPIOx, SHT2X_SCL_PIN)           /* SCL = 1 */
#define I2C_SHT2X_SCL_0()             GPIO_ResetBits( SHT2X_I2Cx_GPIOx, SHT2X_SCL_PIN)        /* SCL = 0 */#define I2C_SHT2X_SDA_1()             GPIO_SetBits( SHT2X_I2Cx_GPIOx, SHT2X_SDA_PIN)          /* SDA = 1 */
#define I2C_SHT2X_SDA_0()             GPIO_ResetBits( SHT2X_I2Cx_GPIOx, SHT2X_SDA_PIN)        /* SDA = 0 */I2C stru_Sht2xDrv;
/******************************************************************************
* EXPORTED FUNCTIONS
******************************************************************************/static void i2c_init_port( void )
{GPIO_InitType i2c1_gpio;/* Enable GPIO clock */RCC_EnableAPB2PeriphClk(SHT2X_I2C_PORT_RCC_APB2, ENABLE);/*PB6/PB8 -- SCL; PB7/PB9 -- SDA*/i2c1_gpio.Pin        = SHT2X_SCL_PIN | SHT2X_SDA_PIN;i2c1_gpio.GPIO_Speed = GPIO_Speed_2MHz;i2c1_gpio.GPIO_Mode  = GPIO_Mode_Out_OD;GPIO_InitPeripheral(SHT2X_I2Cx_GPIOx, &i2c1_gpio);
}static uint8_t i2c_SDA_READ( void )
{GPIO_InitType GPIO_InitStructure;uint8_t val;// set io as input GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.Pin       = SHT2X_SDA_PIN;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;GPIO_InitPeripheral(SHT2X_I2Cx_GPIOx, &GPIO_InitStructure);// set io as output val = ((SHT2X_I2Cx_GPIOx->PID & SHT2X_SDA_PIN) != 0);GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;GPIO_InitPeripheral(SHT2X_I2Cx_GPIOx, &GPIO_InitStructure);return  val;
}static uint8_t i2c_SCL_READ( void )
{GPIO_InitType GPIO_InitStructure;uint8_t val;// set io as input GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.Pin       = SHT2X_SCL_PIN;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;GPIO_InitPeripheral(SHT2X_I2Cx_GPIOx, &GPIO_InitStructure);// set io as output val = ((SHT2X_I2Cx_GPIOx->PID & SHT2X_SCL_PIN) != 0);GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;GPIO_InitPeripheral(SHT2X_I2Cx_GPIOx, &GPIO_InitStructure);   return val;
}static void set_i2c_scl_1( void )
{I2C_SHT2X_SCL_1();
}static void set_i2c_scl_0( void )
{I2C_SHT2X_SCL_0();
}static void set_i2c_sda_1( void )
{I2C_SHT2X_SDA_1();
}static void set_i2c_sda_0( void )
{I2C_SHT2X_SDA_0();
}void i2c_Sht2xDrvRegisterPort(void)
{stru_Sht2xDrv.IIC_InitPort = i2c_init_port;stru_Sht2xDrv.IIC_READ_SCL = i2c_SCL_READ;stru_Sht2xDrv.IIC_READ_SDA = i2c_SDA_READ;stru_Sht2xDrv.IIC_SCL_H = set_i2c_scl_1;stru_Sht2xDrv.IIC_SCL_L = set_i2c_scl_0;stru_Sht2xDrv.IIC_SDA_H = set_i2c_sda_1;stru_Sht2xDrv.IIC_SDA_L = set_i2c_sda_0;
}

2.2 OLED驱动接口

创建oled_port.c 文件，实现如下代码：

/** \file$Id: oled_port.c 40486 2018-08-12 13:50:21Z tangmingfei2013@126.com $Copyright (c)tangmingfei2013@126.com Holding B.V.
All Rights Reserved.This source code and any compilation or derivative thereof is the proprietary
information of mingfei.tang Holding B.V. and is confidential in nature.
Under no circumstances is this software to be combined with any
Open Source Software in any way or placed under an Open Source License
of any type without the express written permission of mingfei.tang Holding B.V.
*/
/*******************************************************************************
* EXPORT INCLUDE FILES
*******************************************************************************/
#include "oled_port.h"
/*******************************************************************************
* LOCAL INCLUDE FILES
*******************************************************************************/
#define OLED_I2C_PORT_RCC_APB2         RCC_APB2_PERIPH_GPIOB
#define OLED_SCL_PIN                   GPIO_PIN_11
#define OLED_SDA_PIN                   GPIO_PIN_12
#define OLED_I2Cx_GPIOx                GPIOB#define I2C_SCL_1()             GPIO_SetBits(OLED_I2Cx_GPIOx, OLED_SCL_PIN)           /* SCL = 1 */
#define I2C_SCL_0()             GPIO_ResetBits( OLED_I2Cx_GPIOx, OLED_SCL_PIN)        /* SCL = 0 */#define I2C_SDA_1()             GPIO_SetBits( OLED_I2Cx_GPIOx, OLED_SDA_PIN)          /* SDA = 1 */
#define I2C_SDA_0()             GPIO_ResetBits( OLED_I2Cx_GPIOx, OLED_SDA_PIN)        /* SDA = 0 */I2C stru_OledDrv;
/******************************************************************************
* EXPORTED FUNCTIONS
******************************************************************************/static void i2c_init_port( void )
{GPIO_InitType i2c1_gpio;/* Enable GPIO clock */RCC_EnableAPB2PeriphClk(OLED_I2C_PORT_RCC_APB2, ENABLE);/*PB11 -- SCL; PB12 -- SDA*/i2c1_gpio.Pin        = OLED_SCL_PIN | OLED_SDA_PIN;i2c1_gpio.GPIO_Speed = GPIO_Speed_2MHz;i2c1_gpio.GPIO_Mode  = GPIO_Mode_Out_OD;GPIO_InitPeripheral(OLED_I2Cx_GPIOx, &i2c1_gpio);
}static uint8_t i2c_SDA_READ( void )
{GPIO_InitType GPIO_InitStructure;uint8_t val;// set io as input GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.Pin       = OLED_SDA_PIN;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;GPIO_InitPeripheral(OLED_I2Cx_GPIOx, &GPIO_InitStructure);// set io as output val = ((OLED_I2Cx_GPIOx->PID & OLED_SDA_PIN) != 0);GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;GPIO_InitPeripheral(OLED_I2Cx_GPIOx, &GPIO_InitStructure);return  val;
}static uint8_t i2c_SCL_READ( void )
{GPIO_InitType GPIO_InitStructure;uint8_t val;// set io as input GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.Pin       = OLED_SCL_PIN;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;GPIO_InitPeripheral(OLED_I2Cx_GPIOx, &GPIO_InitStructure);// set io as output val = ((OLED_I2Cx_GPIOx->PID & OLED_SCL_PIN) != 0);GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;GPIO_InitPeripheral(OLED_I2Cx_GPIOx, &GPIO_InitStructure);   return val;
}static void set_i2c_scl_1( void )
{I2C_SCL_1();
}static void set_i2c_scl_0( void )
{I2C_SCL_0();
}static void set_i2c_sda_1( void )
{I2C_SDA_1();
}static void set_i2c_sda_0( void )
{I2C_SDA_0();
}void i2c_OledRegisterPort(void)
{stru_OledDrv.IIC_InitPort = i2c_init_port;stru_OledDrv.IIC_READ_SCL = i2c_SCL_READ;stru_OledDrv.IIC_READ_SDA = i2c_SDA_READ;stru_OledDrv.IIC_SCL_H = set_i2c_scl_1;stru_OledDrv.IIC_SCL_L = set_i2c_scl_0;stru_OledDrv.IIC_SDA_H = set_i2c_sda_1;stru_OledDrv.IIC_SDA_L = set_i2c_sda_0;
}

3 应用接口实现

3.1 软件框架

在i2c_master.c文件中实现了所有i2c功能函数

1）sht2x驱动部分

- 在sht2x_port.c中实现和mcu相关的硬件接口

- sht2x.c 应用层的驱动函数库

2）OLED驱动部分

- 在oled_port.c中实现和mcu相关的硬件接口

- oled.c 应用层的驱动函数库