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[bsp] fixed uart overrun bugs

This commit is contained in:
tanek liang 2017-12-09 11:12:46 +08:00
parent 514b39bb5b
commit 75ecc46739
1 changed files with 16 additions and 2 deletions
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18
bsp/imxrt1052-evk/drivers/usart.c
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@ -320,19 +320,33 @@ static int imxrt_getc(struct rt_serial_device *serial)
*/ */
static void uart_isr(struct rt_serial_device *serial) static void uart_isr(struct rt_serial_device *serial)
{ {
struct imxrt_uart *uart = (struct imxrt_uart *) serial->parent.user_data; struct imxrt_uart *uart;
LPUART_Type *base;
RT_ASSERT(serial != RT_NULL);
uart = (struct imxrt_uart *) serial->parent.user_data;
RT_ASSERT(uart != RT_NULL); RT_ASSERT(uart != RT_NULL);
base = uart->uart_base;
RT_ASSERT(base != RT_NULL);
/* enter interrupt */ /* enter interrupt */
rt_interrupt_enter(); rt_interrupt_enter();
/* UART in mode Receiver -------------------------------------------------*/ /* UART in mode Receiver -------------------------------------------------*/
if (LPUART_GetStatusFlags(uart->uart_base) & kLPUART_RxDataRegFullFlag) if (LPUART_GetStatusFlags(base) & kLPUART_RxDataRegFullFlag)
{ {
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND); rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
} }
/* If RX overrun. */
if (LPUART_STAT_OR_MASK & base->STAT)
{
/* Clear overrun flag, otherwise the RX does not work. */
base->STAT = ((base->STAT & 0x3FE00000U) | LPUART_STAT_OR_MASK);
}
/* leave interrupt */ /* leave interrupt */
rt_interrupt_leave(); rt_interrupt_leave();
} }