/*
* Transmit message.
*
* This implements flow control by waiting for the slave to be non-busy.
*/
void spi_tx_wait(void)
{
struct spi_dev *dev = &spi_dev;
struct ayla_cmd *cmd;
u8 mask;
cmd = (struct ayla_cmd *)spi_tx_buf;
mask = spi_tx_get_mask_to_check(cmd->protocol, cmd->opcode);
if (spi_tx_check_busy(mask)) {
return;
}
dev->state = SS_TX_START;
spi_tx_start();
}
static void tx_task(void)
{
if (USB_DeviceState != DEVICE_STATE_Configured)
return;
Endpoint_SelectEndpoint(OUT_EPADDR);
if (Endpoint_IsOUTReceived() && csma_tx_allowed() && spi_tx_prepare()) {
if (Endpoint_IsReadWriteAllowed()) {
if (!(data[front].flags & FLAG_TX_READY)) {
Endpoint_Read_Stream_LE(&data[front], sizeof(data[front]), NULL);
data[front].flags |= FLAG_TX_READY;
adf_set_tx_mode();
spi_tx_start();
} else {
Endpoint_Read_Stream_LE(&data[back], sizeof(data[back]), NULL);
data[back].flags |= FLAG_TX_READY;
}
Endpoint_ClearOUT();
}
}
}
/*
* Poll for incoming messages.
*/
void spi_poll(void)
{
struct spi_dev *dev = &spi_dev;
int pri;
if (!stm32_ready()) {
return;
}
pri = intr_disable_save();
switch (dev->state) {
case SS_IDLE:
if (spi_platform_rx_pending()) {
dev->state = SS_RX_WAIT;
spi_platform_slave_select();
spi_rx_wait();
} else if (dev->tx_ready) {
spi_platform_slave_select();
dev->state = SS_TX_WAIT;
}
break;
case SS_RX_WAIT:
spi_rx_wait();
break;
case SS_RX:
spi_rx();
break;
case SS_TX_WAIT:
spi_tx_wait();
break;
case SS_TX_START:
spi_tx_start();
break;
case SS_TX_END:
spi_tx_end();
break;
}
intr_restore(pri);
}
