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软件iic测试成功

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kevin
2021-10-25 00:33:34 +08:00
parent 21c127e2b9
commit 39a9350cd1
10 changed files with 7082 additions and 6854 deletions
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my_software/iic.c
+115 -88
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@@ -11,121 +11,148 @@
#define iic_scl(x) HAL_GPIO_WritePin(iic_scl_GPIO_Port, iic_scl_Pin, x)
#define read_iic_sda HAL_GPIO_ReadPin(iic_sda_GPIO_Port, iic_sda_Pin)
#define IIC_SDA_SET iic_sda(1)
#define IIC_SCL_SET iic_scl(1)
#define IIC_SDA_CLR iic_sda(0)
#define IIC_SCL_CLR iic_scl(0)
#define SDA_OUT() change_io_function(iic_sda_GPIO_Port, iic_sda_Pin,0)
#define SDA_IN() change_io_function(iic_sda_GPIO_Port, iic_sda_Pin,1)
#define READ_SDA read_iic_sda
void iic_start()
//产生IIC起始信号
void IIC_Start(void)
{
iic_sda(1);
iic_scl(1);
iic_sda(0);
iic_scl(0);
SDA_OUT(); //sda线输出
IIC_SDA_SET;
IIC_SCL_SET;
IIC_SDA_CLR;//START:when CLK is high,DATA change form high to low
IIC_SCL_CLR;//钳住I2C总线，准备发送或接收数据
}
void iic_stop()
//产生IIC停止信号
void IIC_Stop(void)
{
iic_sda(0);
iic_scl(1);
iic_sda(1);
SDA_OUT();//sda线输出
IIC_SCL_CLR;
IIC_SDA_CLR;//STOP:when CLK is high DATA change form low to high
IIC_SCL_SET;
IIC_SDA_SET;//发送I2C总线结束信号
}
void iic_ack()
//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 IIC_Wait_Ack(void)
{
iic_scl(0);
iic_sda(0);
iic_scl(1);
iic_scl(0);
}
char iic_wait_ack()
{
int a=3000;
iic_scl(1);
iic_sda(1);
change_io_function(iic_sda_GPIO_Port, iic_sda_Pin,1);
// while(read_iic_sda)
// {
// a--;
// if(a==0)
// {
// iic_stop();
// return 1;
// }
// }
HAL_Delay(1);
change_io_function(iic_sda_GPIO_Port, iic_sda_Pin,0);
uint8_t ucErrTime=0;
SDA_IN(); //SDA设置为输入
IIC_SDA_SET;
IIC_SCL_SET;
while(READ_SDA)
{
ucErrTime++;
if(ucErrTime>250)
{
IIC_Stop();
return 1;
}
}
IIC_SCL_CLR;//时钟输出0
return 0;
}
void IIC_Write_Byte(unsigned char IIC_Byte)
//产生ACK应答
void IIC_Ack(void)
{
iic_scl(0);
for(unsigned char i=0;i<8;i++)
{
if(IIC_Byte & 0x80)
{
iic_sda(1);
}else
{
iic_sda(0);
}
IIC_Byte<<=1;
iic_scl(1);
iic_scl(0);
}
IIC_SCL_CLR;
SDA_OUT();
IIC_SDA_CLR;
IIC_SCL_SET;
IIC_SCL_CLR;
}
unsigned char IIC_Read_Byte()
//不产生ACK应答
void IIC_NAck(void)
{
unsigned char k=0;
iic_scl(0);
iic_sda(1);
change_io_function(iic_sda_GPIO_Port, iic_sda_Pin,1);
for(unsigned char i=0; i<8; i++)
{
iic_scl(1);
k<<=1;
if(read_iic_sda==1)
{
k|=0x01;
}
iic_scl(0);
}
change_io_function(iic_sda_GPIO_Port, iic_sda_Pin,0);
return(k);
IIC_SCL_CLR;
SDA_OUT();
IIC_SDA_SET;
IIC_SCL_SET;
IIC_SCL_CLR;
}
//IIC发送一个字节
//返回从机有无应答
//1，有应答
//0，无应答
void IIC_Send_Byte(uint8_t txd)
{
uint8_t t;
SDA_OUT();
IIC_SCL_CLR;//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)
IIC_SDA_SET;
else
IIC_SDA_CLR;
txd<<=1;
IIC_SCL_SET;
IIC_SCL_CLR;
}
}
//读1个字节，ack=1时，发送ACK，ack=0，发送nACK
uint8_t IIC_Read_Byte(unsigned char ack)
{
unsigned char i,receive=0;
SDA_IN();//SDA设置为输入
for(i=0;i<8;i++ )
{
IIC_SCL_CLR;
IIC_SCL_SET;
receive<<=1;
if(READ_SDA)receive++;
}
if (!ack)
IIC_NAck();//发送nACK
else
IIC_Ack(); //发送ACK
return receive;
}
void IIC_SAND_DATE(unsigned char DEVICE_ADD,unsigned char IN_DEVICE_ADD,char *DATAS,uint16_t LONG)
{
iic_start();
IIC_Write_Byte(DEVICE_ADD);
if(iic_wait_ack()){return;}
IIC_Write_Byte(IN_DEVICE_ADD);
if(iic_wait_ack()){return;}
IIC_Start();
IIC_Send_Byte(DEVICE_ADD);
if(IIC_Wait_Ack()){return;}
IIC_Send_Byte(IN_DEVICE_ADD);
if(IIC_Wait_Ack()){return;}
for(int a=0;a<LONG;a++)
{
IIC_Write_Byte(*DATAS);
IIC_Send_Byte(*DATAS);
DATAS++;
}
if(iic_wait_ack()){return;}
iic_stop();
if(IIC_Wait_Ack()){return;}
IIC_Stop();
}
void IIC_READ_DATE(unsigned char DEVICE_ADD,unsigned char IN_DEVICE_ADD,char *DATAS,uint16_t LONG)
{
iic_start();
IIC_Write_Byte(DEVICE_ADD);
if(iic_wait_ack()){return;}
IIC_Write_Byte(IN_DEVICE_ADD);
if(iic_wait_ack()){return;}
iic_start();
IIC_Write_Byte(DEVICE_ADD+1);
if(iic_wait_ack()){return;}
IIC_Start();
IIC_Send_Byte(DEVICE_ADD);
if(IIC_Wait_Ack()){return;}
IIC_Send_Byte(IN_DEVICE_ADD);
if(IIC_Wait_Ack()){return;}
IIC_Start();
IIC_Send_Byte(DEVICE_ADD+1);
if(IIC_Wait_Ack()){return;}
for(int a=0;a<LONG;a++)
{
*DATAS=IIC_Read_Byte();
*DATAS=IIC_Read_Byte(0);
DATAS++;
}
if(iic_wait_ack()){return;}
iic_stop();
if(IIC_Wait_Ack()){return;}
IIC_Stop();
}