static uint8_t I2C_ReceiveByte(void)
{
uint8_t i, i2c_data = 0;
gpio_set(I2C_port, I2C_SDA);
gpio_clear(I2C_port, I2C_SCL);
for(i=0; i<8; i++)
{
gpio_set(I2C_port, I2C_SCL);
delay_us(10);
i2c_data<<=1;
if(gpio_get(I2C_port, I2C_SDA))
i2c_data|=0x01;
gpio_clear(I2C_port, I2C_SCL);
delay_us(10);
}
I2C_SendNACK();
return i2c_data;
}
uint8_t I2C_ReadByte(uint8_t ack)
{
uint8_t i,receive=0;
I2C_WriteBitSDA(1);
for(i=0; i<8; i++)
{
I2C_WriteBitSCL(0);
I2C_delay_us(2);
I2C_WriteBitSCL(1);
receive<<=1;
if(I2C_ReadBitSDA()) receive++;
I2C_delay_us(1);
}
if(ack)
I2C_SendACK();
else
I2C_SendNACK();
return receive;
}
int I2C_ReadRepeated(I2C_ConfigStruct* conf, uint8_t addr, uint8_t* data, uint32_t len)
{
int i;
I2C_Start(conf);
//Write addr | read command
if(I2C_WriteByte(conf, (addr | 1)) != 0)
{
printf("Received NACK at address phase!!\r\n");
return -1;
}
//Read data
for(i=0; i<len; i++)
{
data[i] = I2C_ReadByte(conf);
if( i == (len - 1) )
I2C_SendNACK(conf);
else
I2C_SendACK(conf);
}
return 0;//success
}
// I2C模拟接收一个字节
u8 I2C_ReceiveByte(void)
{
u8 i,i2c_data;
I2C_SDA_H;
I2C_SCL_L;
i2c_data=0;
for(i=0;i<8;i++)
{
I2C_SCL_H;
I2C_NOP;
i2c_data<<=1;
if(I2C_SDA_STATE)
i2c_data|=0x01;
I2C_SCL_L;
I2C_NOP;
}
I2C_SendNACK();
return i2c_data;
}
