/*
* iic_exec:
*
* Simplified I2C client interface engine.
*
* This and the SMBus routines are the preferred interface for
* client access to I2C/SMBus, since many automated controllers
* do not provide access to the low-level primitives of the I2C
* bus protocol.
*/
int
iic_exec(i2c_tag_t tag, i2c_op_t op, i2c_addr_t addr, const void *vcmd,
size_t cmdlen, void *vbuf, size_t buflen, int flags)
{
const uint8_t *cmd = vcmd;
uint8_t *buf = vbuf;
int error;
size_t len;
/*
* Defer to the controller if it provides an exec function. Use
* it if it does.
*/
if (tag->ic_exec != NULL)
return ((*tag->ic_exec)(tag->ic_cookie, op, addr, cmd,
cmdlen, buf, buflen, flags));
if ((len = cmdlen) != 0) {
if ((error = iic_initiate_xfer(tag, addr, flags)) != 0)
goto bad;
while (len--) {
if ((error = iic_write_byte(tag, *cmd++, flags)) != 0)
goto bad;
}
}
if (I2C_OP_READ_P(op))
flags |= I2C_F_READ;
len = buflen;
while (len--) {
if (len == 0 && I2C_OP_STOP_P(op))
flags |= I2C_F_STOP;
if (I2C_OP_READ_P(op)) {
/* Send REPEATED START. */
if ((len + 1) == buflen &&
(error = iic_initiate_xfer(tag, addr, flags)) != 0)
goto bad;
/* NACK on last byte. */
if (len == 0)
flags |= I2C_F_LAST;
if ((error = iic_read_byte(tag, buf++, flags)) != 0)
goto bad;
} else {
/* Maybe send START. */
if ((len + 1) == buflen && cmdlen == 0 &&
(error = iic_initiate_xfer(tag, addr, flags)) != 0)
goto bad;
if ((error = iic_write_byte(tag, *buf++, flags)) != 0)
goto bad;
}
}
return (0);
bad:
iic_send_stop(tag, flags);
return (error);
}
/**************************实现函数********************************************
*函数原型：void iic_addr_test(uint8_t reg, uint8_t *data)
*功 能：尝试读写地址i上的reg
*输 入：reg 目标设备地址
* addr 寄存器地址
* addr_num 将要写的数据
*返 回：返回是否成功
*******************************************************************************/
void iic_addr_test(uint8_t reg, uint8_t *addr, uint8_t addr_num)
{
uint8_t i;
uint8_t temp;
for(i=0;i!=255;i++)
{
if(iic_write_byte(i, reg, temp) == IIC_SUCCESS)
addr[(addr_num--)-2] = i;
else if(iic_read_byte(i, reg, &temp) == IIC_SUCCESS)
addr[(addr_num--)-2] = i;
if(addr_num == 0)
break;
}
}
bool_t pmu_write(u8_t reg, u8_t val)
{
if(iic_write_byte(0x34, reg, val) == 0)
return FALSE;
return TRUE;
}
