void IIC_Read_Byte(unsigned char ack,unsigned char *data)
{
unsigned char i;
unsigned char receive=0;
SDA_IN();
for(i=0; i<8; i++)
{
IIC_SCL(0);
delay_us(2);
IIC_SCL(1);
receive <<= 1;
if(READ_SDA)receive++;
delay_us(1);
}
*data = receive;
if (!ack)
IIC_NAck();
else
IIC_Ack();
}
uint8_t IIC_Wait_Ack(void)
{
uint8_t ucErrTime = 0;
SDA_IN();
IIC_SDA(1);
delay_us(1);
IIC_SCL(1);
delay_us(1);
while(READ_SDA)
{
ucErrTime++;
if(ucErrTime>250)
{
IIC_Stop();
return 1;
}
}
IIC_SCL(0);
return 0;
}
//不产生ACK应答
static void IIC_NAck(void)
{
SDA_OUT();
IIC_SDA(1);
IIC_SCL(1);
I2C_delay();
IIC_SCL(0);
I2C_delay();
}
static void IIC_NAck(void)
{
IIC_SCL(0);
SDA_OUT();
IIC_SDA(1);
delay_us(2);
IIC_SCL(1);
delay_us(2);
IIC_SCL(0);
}
static void IIC_Stop(void)
{
SDA_OUT();
IIC_SCL(0);
IIC_SDA(0);//STOP:when CLK is high DATA change form low to high
delay_us(4);
IIC_SCL(1);
IIC_SDA(1);
delay_us(4);
}
static void IIC_Start(void)
{
SDA_OUT();
IIC_SDA(1);
IIC_SCL(1);
delay_us(4);
IIC_SDA(0);
delay_us(4);
IIC_SCL(0);
}
//产生IIC起始信号
static bool IIC_Start(void)
{
SDA_OUT(); //sda线输出
IIC_SDA(1);
IIC_SCL(1);
I2C_delay();
IIC_SDA(0);//START:when CLK is high,DATA change form high to low
I2C_delay();
IIC_SCL(0);//钳住I2C总线，准备发送或接收数据
return TRUE ;
}
//IIC发送一个字节
//返回从机有无应答
//1，有应答
//0，无应答
static void IIC_Send_Byte(u8 txd)
{
u8 t;
SDA_OUT();
for(t=0;t<8;t++)
{
IIC_SDA((txd&0x80)>>7);
txd<<=1;
IIC_SCL(1);
I2C_delay();
IIC_SCL(0);
I2C_delay();
}
}
//等待应答信号到来
//返回值：FALSE，接收应答失败
// TRUE，接收应答成功
static bool IIC_Wait_Ack(void)
{
SDA_IN(); //SDA设置为输入
IIC_SCL(1);
I2C_delay();
if(READ_SDA)
{
IIC_SCL(0);
I2C_delay();
return FALSE;
}
IIC_SCL(0);//时钟输出0
I2C_delay();
return TRUE;
}
//产生IIC停止信号
static void IIC_Stop(void)
{
SDA_OUT();//sda线输出
IIC_SDA(0);//STOP:when CLK is high DATA change form low to high
IIC_SCL(1);
I2C_delay();
IIC_SDA(1);//发送I2C总线结束信号
I2C_delay();
}
static void IIC_Send_Byte(uint8_t txd)
{
uint8_t t;
SDA_OUT();
IIC_SCL(0);
for(t=0; t<8; t++)
{
IIC_SDA((txd&0x80)>>7);
txd<<=1;
delay_us(2);
IIC_SCL(1);
delay_us(2);
IIC_SCL(0);
delay_us(2);
}
}
//读1个字节，ack=1时，发送ACK，ack=0，发送nACK
static u8 IIC_Read_Byte(unsigned char ack)
{
unsigned char i,receive=0;
IIC_SDA(1);
SDA_IN();//SDA设置为输入
for(i=0;i<8;i++ )
{
receive<<=1;
IIC_SCL(1);
I2C_delay();
if(READ_SDA)receive |= 0x01;
IIC_SCL(0);
I2C_delay();
}
if (ack)
IIC_Ack(); //发送ACK
else
IIC_NAck();//发送nACK
return receive;
}
void I2C_GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(IIC_GPIO_CLK, ENABLE );
GPIO_InitStructure.GPIO_Pin = IIC_SCL_PIN | IIC_SDA_PIN;// 配置 CLK 和 SDA
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;//GPIO_Mode_Out_PP;// //推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;//GPIO_Speed_50MHz;
GPIO_Init(IIC_GPIO, &GPIO_InitStructure);
GPIO_SetBits(IIC_GPIO,IIC_SCL_PIN | IIC_SDA_PIN);
IIC_SCL(1);//空闲时总线为高
IIC_SDA(1);
}
static void IIC_Send_Byte(uint8_t txd)
{
uint8_t t;
SDA_OUT();
IIC_SCL(0);
for(t=0;t<8;t++)
{
//IIC_SDA=(txd&0x80)>>7;
if((txd&0x80)>>7)
{
IIC_SDA(1);
}
else
{
IIC_SDA(0);
}
txd<<=1;
delay_us(2);
IIC_SCL(1);
delay_us(2);
IIC_SCL(0);
delay_us(2);
}
static void IIC_Init(void)
{
IIC_SCL(1);
IIC_SDA(1);
port_get_config_defaults(&pin_clk);
pin_clk.direction = PORT_PIN_DIR_OUTPUT;
port_pin_set_config(PIN_I2C_CLK, &pin_clk);
port_pin_set_output_level(PIN_I2C_CLK, 1);
port_get_config_defaults(&pin_data);
pin_data.direction = PORT_PIN_DIR_OUTPUT;
port_pin_set_config(PIN_I2C_DATA, &pin_clk);
port_pin_set_output_level(PIN_I2C_DATA, 1);
}
