u8 sccb_read(u8 IdAddr, u8 SubAddr)
{
u8 data;
down(&bus_lock);
sccb_start();
sccb_write_byte(IdAddr);
sccb_write_byte(SubAddr);
sccb_stop();
sccb_start();
sccb_write_byte(IdAddr|0x01);
data = sccb_read_byte();
sccb_stop();
up(&bus_lock);
return data;
}
/**
* @brief 读取一串数据
* @param pBuffer 存放读出数据
* @param ReadAddress 待读出地址
* @retval 1：成功读入
* 2：失败
*/
int sccb_read_byte(uint8_t* pBuffer, uint16_t length, uint8_t ReadAddress)
{
if(!sccb_start())
{
return DISABLE;
}
sccb_send_byte( DEV_ADR ); /* 器件地址 */
if( !sccb_wait_ack() )
{
sccb_stop();
return DISABLE;
}
sccb_send_byte( ReadAddress ); /* 设置低起始地址 */
sccb_wait_ack();
sccb_stop();
if(!sccb_start())
{
return DISABLE;
}
sccb_send_byte( DEV_ADR + 1 ); /* 器件地址 */
if(!sccb_wait_ack())
{
sccb_stop();
return DISABLE;
}
while(length)
{
*pBuffer = sccb_receive_byte();
if(length == 1)
{
sccb_no_ack();
}
else
{
sccb_ack();
}
pBuffer++;
length--;
}
sccb_stop();
return ENABLE;
}
void sccb_write(u8 IdAddr, u8 SubAddr, u8 data)
{
down(&bus_lock);
sccb_start();
sccb_write_byte(IdAddr);
sccb_write_byte(SubAddr);
sccb_write_byte(data);
sccb_stop();
up (&bus_lock);
}
/**
* @brief 写一字节数据
* @param WriteAddress 待写入地址
* @param SendByte 待写入数据
* @retval 无
*/
int sccb_write_byte( uint16_t WriteAddress , uint8_t SendByte )
{
if(!sccb_start())
{
return DISABLE;
}
sccb_send_byte( DEV_ADR ); /* 器件地址 */
if( !sccb_wait_ack() )
{
sccb_stop();
return DISABLE;
}
sccb_send_byte((uint8_t)(WriteAddress & 0x00FF)); /* 设置低起始地址 */
sccb_wait_ack();
sccb_send_byte(SendByte);
sccb_wait_ack();
sccb_stop();
return ENABLE;
}
