int serial_writable(serial_t *obj)
{
uint32_t status_flags = LPUART_GetStatusFlags(uart_addrs[obj->index]);
if (status_flags & kLPUART_RxOverrunFlag)
LPUART_ClearStatusFlags(uart_addrs[obj->index], kLPUART_RxOverrunFlag);
return (status_flags & kLPUART_TxDataRegEmptyFlag);
}
int serial_readable(serial_t *obj)
{
uint32_t status_flags = LPUART_GetStatusFlags(uart_addrs[obj->index]);
if (status_flags & kLPUART_RxOverrunFlag) {
LPUART_ClearStatusFlags(uart_addrs[obj->index], kLPUART_RxOverrunFlag);
}
return (status_flags & kLPUART_RxDataRegFullFlag);
}
/******************************************************************************
* INTERRUPTS HANDLING
******************************************************************************/
static inline void uart_irq(uint32_t transmit_empty, uint32_t receive_full, uint32_t index) {
LPUART_Type *base = uart_addrs[index];
/* If RX overrun. */
if (LPUART_STAT_OR_MASK & base->STAT)
{
/* Read base->D, otherwise the RX does not work. */
(void)base->DATA;
LPUART_ClearStatusFlags(base, kLPUART_RxOverrunFlag);
}
if (serial_irq_ids[index] != 0) {
if (transmit_empty)
irq_handler(serial_irq_ids[index], TxIrq);
if (receive_full)
irq_handler(serial_irq_ids[index], RxIrq);
}
}
static int mcux_lpuart_err_check(struct device *dev)
{
const struct mcux_lpuart_config *config = dev->config->config_info;
u32_t flags = LPUART_GetStatusFlags(config->base);
int err = 0;
if (flags & kLPUART_RxOverrunFlag) {
err |= UART_ERROR_OVERRUN;
}
if (flags & kLPUART_ParityErrorFlag) {
err |= UART_ERROR_PARITY;
}
if (flags & kLPUART_FramingErrorFlag) {
err |= UART_ERROR_FRAMING;
}
LPUART_ClearStatusFlags(config->base, kLPUART_RxOverrunFlag |
kLPUART_ParityErrorFlag |
kLPUART_FramingErrorFlag);
return err;
}