/*-----------------------------------------------------------------------------
* I2C_Recovery: Recovery procedure for I2C lines when irregular
* communication interrupt occures.
*
* Return: 0 on success, nonzero on error
*----------------------------------------------------------------------------*/
uint32_t I2C_Recovery (uint32_t err) {
uint32_t i;
#if 1
GPIOB->AFR[1] &= ~0x000000FF; /* Set SDA and SCL as GPIO */
I2C1->CR1 |= I2C_CR1_SWRST; /* Put I2C peripheral in reset mode */
io_dir (IO_SDA | IO_SCL, IO_OUT); /* SDA and SCL pins are outputs */
io_pin (IO_SDA | IO_SCL, IO_HI); /* Pull both lines high */
Wait();
io_pin (IO_SCL, IO_LOW); /* Generate start ccondition */
io_pin (IO_SDA, IO_HI); /* Pull SDA high */
for (i = 0; i < 9; i++) {
if (io_state (IO_SDA) == IO_HI) break; /* Break if SDA released by slave */
io_pin (IO_SCL, IO_HI); /* Clock high */
Wait();
io_pin (IO_SCL, IO_LOW); /* Clock low */
Wait();
}
/* Send stop */
io_pin (IO_SDA, IO_LOW); /* Pull SDA low */
io_pin (IO_SCL, IO_HI); /* Pull SCL high */
Wait();
io_pin (IO_SDA, IO_HI); /* Pull SDA high == stop condition */
I2C1->CR1 &= ~I2C_CR1_SWRST; /* Dereset I2C peripheral */
return (I2C_Init()); /* Reinit I2C peripheral */
#else
return (1);
#endif
}
static int tcp_server_client_state(object_t parent)
{
return io_state(parent);
}