请问kinetis有用GPIO模拟I2C的参考代码吗？

huiyao · 发表于 2017-6-30 14:27:52

你好，请问kinetis有用GPIO模拟I2C的参考代码吗？因为目前项目要用到的I2C口比较多，需要用IO来模拟，但之前没有弄过，所以想求一下代码来参考，非常感谢！

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小马哥-1650185 · 发表于 2017-6-30 14:36:08

模拟iic 和什么主控芯片没关系，先去学习下iic 时序吧

混森蓝兽 · 发表于 2017-6-30 14:58:27

模拟的随便找个例程就行了，说白了就是GPIO操作和延时而已

技术范儿 · 发表于 2017-6-30 15:01:10

#include "ioiic.h"
static void delay_us(uint16_t xus)
{
uint16_t i,j;
for(i=xus;i>0;i--)
for(j=16;j>0;j--)
__asm("NOP");
}
static void delay_ms(uint16_t xms)
{
uint16_t i,j;
for(i=xms;i>0;i--)
for(j=19999;j>0;j--)
__asm("NOP");
}
static void SDA0_OUT()
{
gpio_pin_config_t sda_config = {kGPIO_DigitalOutput, 1};
CLOCK_EnableClock (IIC0_SDA_CLOCK);
PORT_SetPinMux (IIC0_SDA_PORT,IIC0_SDA_PIN,kPORT_MuxAsGpio);//I2C0_SDA
GPIO_PinInit(IIC0_SDA_GPIO,IIC0_SDA_PIN,&sda_config);
}
static void SDA0_IN()
{
gpio_pin_config_t sda_config = {kGPIO_DigitalInput, 1};
CLOCK_EnableClock (IIC0_SDA_CLOCK);
PORT_SetPinMux (IIC0_SDA_PORT,IIC0_SDA_PIN,kPORT_MuxAsGpio);//I2C0_SDA
GPIO_PinInit(IIC0_SDA_GPIO,IIC0_SDA_PIN,&sda_config);
}
#if 0
static void SDA1_OUT()
{
gpio_pin_config_t sda_config = {kGPIO_DigitalOutput, 1};
CLOCK_EnableClock (IIC1_SDA_CLOCK);
PORT_SetPinMux (IIC1_SDA_PORT,IIC1_SDA_PIN,kPORT_MuxAsGpio);//I2C0_SDA
GPIO_PinInit(IIC1_SDA_GPIO,IIC1_SDA_PIN,&sda_config);
}
static void SDA1_IN()
{
gpio_pin_config_t sda_config = {kGPIO_DigitalInput, 1};
CLOCK_EnableClock (IIC1_SDA_CLOCK);
PORT_SetPinMux (IIC1_SDA_PORT,IIC1_SDA_PIN,kPORT_MuxAsGpio);//I2C0_SDA
GPIO_PinInit(IIC1_SDA_GPIO,IIC1_SDA_PIN,&sda_config);
}
#endif
void IIC0_Config(void)
{
gpio_pin_config_t scl_config = {kGPIO_DigitalOutput, 1};
CLOCK_EnableClock (IIC0_SCL_CLOCK);
PORT_SetPinMux (IIC0_SCL_PORT,IIC0_SCL_PIN,kPORT_MuxAsGpio);//I2C0_SCL
GPIO_PinInit(IIC0_SCL_GPIO,IIC0_SCL_PIN,&scl_config);
}
#if 0
void IIC1_Config(void)
{
gpio_pin_config_t scl_config = {kGPIO_DigitalOutput, 1};
CLOCK_EnableClock (IIC1_SCL_CLOCK);
PORT_SetPinMux (IIC1_SCL_PORT,IIC1_SCL_PIN,kPORT_MuxAsGpio);//I2C1_SCL
GPIO_PinInit(IIC1_SCL_GPIO,IIC1_SCL_PIN,&scl_config);
}
#endif
void IIC0_Start(void)
{
SDA0_OUT(); //sda线输出
IIC0_SDA_H;//IIC_SDA=1;
IIC0_SCL_H;//IIC_SCL=1;
delay_us(4);
IIC0_SDA_L;//IIC_SDA=0;//START:when CLK is high,DATA change form high to low
delay_us(4);
IIC0_SCL_L;//IIC_SCL=0;//钳住I2C总线，准备发送或接收数据
}
//产生IIC停止信号
void IIC0_Stop(void)
{
SDA0_OUT();//sda线输出
IIC0_SCL_L;//IIC_SCL=0;
IIC0_SDA_L;//IIC_SDA=0;//STOP:when CLK is high DATA change form low to high
delay_us(4);
IIC0_SCL_H;//IIC_SCL=1;
IIC0_SDA_H;//IIC_SDA=1;//发送I2C总线结束信号
delay_us(4);
}
//等待应答信号到来
//返回值：1，接收应答失败
// 0，接收应答成功
uint8_t IIC0_Wait_Ack(void)
{
uint8_t ucErrTime=0;
SDA0_IN(); //SDA设置为输入
IIC0_SDA_H;//IIC_SDA=1;
delay_us(1);
IIC0_SCL_H;//IIC_SCL=1;
delay_us(1);
while(IIC0_SDA)
{
ucErrTime++;
if(ucErrTime>250)
{
IIC0_Stop();
return 1;
}
}
IIC0_SCL_L;//IIC_SCL=0;//时钟输出0
return 0;
}
//产生ACK应答
void IIC0_Ack(void)
{
IIC0_SCL_L;//IIC_SCL=0;
SDA0_OUT();
IIC0_SDA_L;//IIC_SDA=0;
delay_us(2);
IIC0_SCL_H;//IIC_SCL=1;
delay_us(2);
IIC0_SCL_L;//IIC_SCL=0;
}
//不产生ACK应答
void IIC0_NAck(void)
{
IIC0_SCL_L;//IIC_SCL=0;
SDA0_OUT();
IIC0_SDA_H;//IIC_SDA=1;
delay_us(2);
IIC0_SCL_H;//IIC_SCL=1;
delay_us(2);
IIC0_SCL_L;//IIC_SCL=0;
}
//IIC发送一个字节
//返回从机有无应答
//
//0，无应答
void IIC0_Send_Byte(uint8_t txd)
{
uint8_t t;
SDA0_OUT();
IIC0_SCL_L;//IIC_SCL=0;//拉低时钟开始数据传输
for(t=0;t<8;t++)
{
//IIC_SDA=(txd&0x80)>>7;
if((txd&0x80)>>7)
IIC0_SDA_H;//IIC_SDA=1;
else
IIC0_SDA_L;//IIC_SDA=0;
txd<<=1;
delay_us(2); //对TEA5767这三个延时都是必须的
IIC0_SCL_H;//IIC_SCL=1;
delay_us(2);
IIC0_SCL_L;//IIC_SCL=0;
delay_us(2);
}
}
//读1个字节，ack=1时，发送ACK，ack=0，发送nACK
uint8_t IIC0_Read_Byte(unsigned char ack)
{
unsigned char i,receive=0;
SDA0_IN();//SDA设置为输入
for(i=0;i<8;i++ )
{
IIC0_SCL_L;//IIC_SCL=0;
delay_us(2);
IIC0_SCL_H;//IIC_SCL=1;
receive<<=1;
if(IIC0_SDA)receive++;
delay_us(1);
}
if (!ack)
IIC0_NAck();//发送nACK
else
IIC0_Ack(); //发送ACK
return receive;
}
#if 0
void IIC1_Start(void)
{
SDA1_OUT(); //sda线输出
IIC1_SDA_H;//IIC_SDA=1;
IIC1_SCL_H;//IIC_SCL=1;
delay_us(4);
IIC1_SDA_L;//IIC_SDA=0;//START:when CLK is high,DATA change form high to low
delay_us(4);
IIC1_SCL_L;//IIC_SCL=0;//钳住I2C总线，准备发送或接收数据
}
//产生IIC停止信号
void IIC1_Stop(void)
{
SDA1_OUT();//sda线输出
IIC1_SCL_L;//IIC_SCL=0;
IIC1_SDA_L;//IIC_SDA=0;//STOP:when CLK is high DATA change form low to high
delay_us(4);
IIC1_SCL_H;//IIC_SCL=1;
IIC1_SDA_H;//IIC_SDA=1;//发送I2C总线结束信号
delay_us(4);
}
//等待应答信号到来
//返回值：1，接收应答失败
// 0，接收应答成功
uint8_t IIC1_Wait_Ack(void)
{
uint8_t ucErrTime=0;
SDA1_IN(); //SDA设置为输入
IIC1_SDA_H;//IIC_SDA=1;
delay_us(1);
IIC1_SCL_H;//IIC_SCL=1;
delay_us(1);
while(IIC1_SDA)
{
ucErrTime++;
if(ucErrTime>250)
{
IIC1_Stop();
return 1;
}
}
IIC1_SCL_L;//IIC_SCL=0;//时钟输出0
return 0;
}
//产生ACK应答
void IIC1_Ack(void)
{
IIC1_SCL_L;//IIC_SCL=0;
SDA1_OUT();
IIC1_SDA_L;//IIC_SDA=0;
delay_us(2);
IIC1_SCL_H;//IIC_SCL=1;
delay_us(2);
IIC1_SCL_L;//IIC_SCL=0;
}
//不产生ACK应答
void IIC1_NAck(void)
{
IIC1_SCL_L;//IIC_SCL=0;
SDA1_OUT();
IIC1_SDA_H;//IIC_SDA=1;
delay_us(2);
IIC1_SCL_H;//IIC_SCL=1;
delay_us(2);
IIC1_SCL_L;//IIC_SCL=0;
}
//IIC发送一个字节
//返回从机有无应答
//
//0，无应答
void IIC1_Send_Byte(uint8_t txd)
{
uint8_t t;
SDA1_OUT();
IIC1_SCL_L;//IIC_SCL=0;//拉低时钟开始数据传输
for(t=0;t<8;t++)
{
//IIC_SDA=(txd&0x80)>>7;
if((txd&0x80)>>7)
IIC1_SDA_H;//IIC_SDA=1;
else
IIC1_SDA_L;//IIC_SDA=0;
txd<<=1;
delay_us(2); //对TEA5767这三个延时都是必须的
IIC1_SCL_H;//IIC_SCL=1;
delay_us(2);
IIC1_SCL_L;//IIC_SCL=0;
delay_us(2);
}
}
//读1个字节，ack=1时，发送ACK，ack=0，发送nACK
uint8_t IIC1_Read_Byte(unsigned char ack)
{
unsigned char i,receive=0;
SDA1_IN();//SDA设置为输入
for(i=0;i<8;i++ )
{
IIC1_SCL_L;//IIC_SCL=0;
delay_us(2);
IIC1_SCL_H;//IIC_SCL=1;
receive<<=1;
if(IIC1_SDA)receive++;
delay_us(1);
}
if (!ack)
IIC1_NAck();//发送nACK
else
IIC1_Ack(); //发送ACK
return receive;
}
#endif

复制代码

原来的你 · 发表于 2017-6-30 15:37:28

技术范儿发表于 2017-6-30 15:01

多谢大神分享

混森蓝兽 · 发表于 2017-6-30 15:57:30

技术范儿发表于 2017-6-30 15:01

多谢大神分享

fscl_start · 发表于 2017-6-30 19:46:18

学习了

疯狂的大石头 · 发表于 2017-7-21 14:11:10

那个，弱弱的问一下，板子上的I2C不够用吗？

[求助] 请问kinetis有用GPIO模拟I2C的参考代码吗？

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