nrf52 iic使用
作者：互联网
一、使用环境
SDK17.1 ble_app_template例程
二、工程配置
2.1 添加官方驱动文件
2.2 使能TWI
三、代码移植
驱动代码 peripheral_iic.h
#ifndef _PERIPHERAL_I2C_H_
#define _PERIPHERAL_I2C_H_
#include "boards.h"
#include "nrf_delay.h"
#include "nrf_drv_twi.h"
#include "nrf_gpio.h"
#include <stdio.h>
#include <string.h>
bool I2C_register_read(uint8_t slave_address, uint8_t register_address, uint8_t *destination, uint8_t number_of_bytes);
bool I2C_register_write(uint8_t slave_address, unsigned char *data_buf, uint8_t len);
int16_t I2C_Write_Reg(unsigned char i2c_add, unsigned char reg_add, unsigned char cmd);
int16_t I2C_Read_Reg(unsigned char i2c_add, unsigned char reg_add, unsigned char *ucData);
int16_t I2C_MultiWrite_Reg(unsigned char i2c_add, unsigned char reg_add, int16_t num, unsigned char *ucData);
int16_t I2C_MultiRead_Reg(unsigned char i2c_add, unsigned char reg_add, int16_t num, unsigned char *ucData);
void I2C_init(void);
void I2C_uninit(void);
#endif // END _PERIPHERAL_I2C_H_
驱动代码 peripheral_iic.c
#include "peripheral_iic.h"
// TWI驱动程序实例ID,ID和外设编号对应，0:TWI0 1:TWI1
#define TWI_INSTANCE_ID_S 0
// TWI传输完成标志
static volatile bool I2C_xfer_done = false;
//定义TWI驱动程序实例，名称为m_twi
static const nrf_drv_twi_t m_twi = NRF_DRV_TWI_INSTANCE(TWI_INSTANCE_ID_S);
// TWI事件处理函数
static void twi_s_handler(nrf_drv_twi_evt_t const *p_event, void *p_context)
{
//判断TWI事件类型
switch (p_event->type)
{
//传输完成事件
case NRF_DRV_TWI_EVT_DONE:
I2C_xfer_done = true; //置位传输完成标志
break;
default:
break;
}
}
/*************************************************************************
* 功 能 : 写I2C_Slave寄存器
* 参 数 : register_address[in]：寄存器地址
* : value[in]：写入的数据
* 返回值 : true:写数据成功,false：写入失败
*************************************************************************/
bool I2C_register_write(uint8_t slave_address, unsigned char *data_buf, uint8_t len)
{
uint8_t timeOut = 0;
ret_code_t err_code;
// TWI传输完成标志设置为false
I2C_xfer_done = false;
//写入数据
err_code = nrf_drv_twi_tx(&m_twi, slave_address, data_buf, len, false);
//等待TWI总线传输完成
timeOut = 0;
while (I2C_xfer_done == false)
{
if (timeOut > 50)
{
return false;
}
else
{
timeOut++;
}
nrf_delay_us(100);
}
if (NRF_SUCCESS != err_code)
{
return false;
}
return true;
}
/*************************************************************************
* 功 能 : 读I2C_Slave寄存器
* 参 数 : register_address[in]：寄存器地址
* : * destination[out] ：指向保存读取数据的缓存
* : number_of_bytes[in] ：读取的数据长度
* 返回值 : true:操作成功,false：操作失败
*************************************************************************/
bool I2C_register_read(uint8_t slave_address, uint8_t register_address, uint8_t *destination, uint8_t number_of_bytes)
{
uint8_t timeOut = 0;
ret_code_t err_code;
// TWI传输完成标志设置为false
I2C_xfer_done = false;
err_code = nrf_drv_twi_tx(&m_twi, slave_address, ®ister_address, 1, true);
//等待TWI总线传输完成
timeOut = 0;
while (I2C_xfer_done == false)
{
if (timeOut > 50)
{
return false;
}
else
{
timeOut++;
}
nrf_delay_us(100);
}
if (NRF_SUCCESS != err_code)
{
return false;
}
// TWI传输完成标志设置为false
I2C_xfer_done = false;
err_code = nrf_drv_twi_rx(&m_twi, slave_address, destination, number_of_bytes);
//等待TWI总线传输完成
timeOut = 0;
while (I2C_xfer_done == false)
{
if (timeOut > 50)
{
return false;
}
else
{
timeOut++;
}
nrf_delay_us(100);
}
if (NRF_SUCCESS != err_code)
{
return false;
}
return true;
}
int16_t I2C_Write_Reg(unsigned char i2c_add, unsigned char reg_add, unsigned char cmd)
{
uint8_t BufTmp[2];
BufTmp[0] = reg_add;
BufTmp[1] = cmd;
return I2C_register_write(i2c_add, BufTmp, 2);
}
int16_t I2C_Read_Reg(unsigned char i2c_add, unsigned char reg_add, unsigned char *ucData)
{
return I2C_register_read(i2c_add, reg_add, ucData, 1);
}
int16_t I2C_MultiWrite_Reg(unsigned char i2c_add, unsigned char reg_add, int16_t num, unsigned char *ucData)
{
uint8_t BufTmp[num + 1];
BufTmp[0] = reg_add;
memcpy(&BufTmp[1], ucData, num);
return I2C_register_write(i2c_add, BufTmp, num + 1);
}
int16_t I2C_MultiRead_Reg(unsigned char i2c_add, unsigned char reg_add, int16_t num, unsigned char *ucData)
{
return I2C_register_read(i2c_add, reg_add, ucData, num);
}
void I2C_init(void)
{
ret_code_t err_code;
//定义并初始化TWI配置结构体
const nrf_drv_twi_config_t twi_config_s = {
.scl = ARDUINO_SCL_PIN, //定义TWI SCL引脚
.sda = ARDUINO_SDA_PIN, //定义TWI SDA引脚
.frequency = NRF_DRV_TWI_FREQ_400K, // TWI速率
.interrupt_priority = APP_IRQ_PRIORITY_HIGHEST, // TWI优先级
.clear_bus_init = false //初始化期间不发送9个SCL时钟
};
//初始化TWI
err_code = nrf_drv_twi_init(&m_twi, &twi_config_s, twi_s_handler, NULL);
//检查返回的错误代码
APP_ERROR_CHECK(err_code);
//使能TWI
nrf_drv_twi_enable(&m_twi);
}
void I2C_uninit(void)
{
//失能TWI
nrf_drv_twi_disable(&m_twi);
nrf_drv_twi_uninit(&m_twi);
nrf_gpio_cfg_default(ARDUINO_SDA_PIN);
nrf_gpio_cfg_default(ARDUINO_SCL_PIN);
}
添加我们的驱动文件和头文件路径，然后使用例子。
四、驱动测试
4.1 添加头文件
#include "peripheral_iic.h"4.2 简单读写测试
#define LIS2MDL_ADDR_WRITE 0x3C//0x3C 0x1EU
#define LIS2MDL_ADDR_READ 0x3D//0x3D 0x1EU
/* 设备寄存器地址 */
#define LIS2MDL_ADDR_CFGA 0x60
#define LIS2MDL_ADDR_CFGB 0x61
#define LIS2MDL_ADDR_CFGC 0x62
#define LIS2MDL_ADDR_INTCRTL 0x63
#define LIS2MDL_ADDR_INTSOURCE 0x64
#define LIS2MDL_ADDR_INTTHSL 0x65
#define LIS2MDL_ADDR_INTTHSH 0x66
#define LIS2MDL_ADDR_STATUS 0x67
#define LIS2MDL_ADDR_XOUTL 0x68
#define LIS2MDL_ADDR_XOUTH 0x69
#define LIS2MDL_ADDR_YOUTHL 0x6A
#define LIS2MDL_ADDR_YOUTH 0x6B
#define LIS2MDL_ADDR_ZOUTL 0x6C
#define LIS2MDL_ADDR_ZOUTH 0x6D
void i2c_test(void)
{
unsigned char writeData = 0x47;
unsigned char readData = 0;
I2C_init();
I2C_MultiWrite_Reg(LIS2MDL_ADDR_WRITE, LIS2MDL_ADDR_CFGA, 1, &writeData);
I2C_MultiRead_Reg(LIS2MDL_ADDR_READ, LIS2MDL_ADDR_XOUTL, 1, &readData);
}
标签：twi,nrf52,TWI,unsigned,char,add,iic,使用,I2C 来源： https://www.cnblogs.com/wfagly/p/16123037.html