static void ck_usart_intr_recv_line()

in RISC-V_RV32_THEAD_SMART_CDS/csi_driver/smartl_rv32/ck_usart.c [385:456]

• 41 lines of code
• 12 McCabe index (conditional complexity)

static void ck_usart_intr_recv_line(int32_t idx, ck_usart_priv_t *usart_priv)
{
    ck_usart_reg_t *addr = (ck_usart_reg_t *)(usart_priv->base);
    uint32_t lsr_stat = addr->LSR;

    addr->IER &= (~IER_THRE_INT_ENABLE);

    uint32_t timecount = 0;

    while (addr->LSR & 0x1) {
        addr->RBR;
        timecount++;

        if (timecount >= UART_BUSY_TIMEOUT) {
            if (usart_priv->cb_event) {
                usart_priv->cb_event(idx, USART_EVENT_RX_TIMEOUT);
            }

            return;
        }
    }

    /** Break Interrupt bit. This is used to indicate the detection of a
      * break sequence on the serial input data.
      */
    if (lsr_stat & DW_LSR_BI) {
        if (usart_priv->cb_event) {
            usart_priv->cb_event(idx, USART_EVENT_RX_BREAK);
        }

        return;
    }

    /** Framing Error bit. This is used to indicate the occurrence of a
      * framing error in the receiver. A framing error occurs when the receiver
      * does not detect a valid STOP bit in the received data.
      */
    if (lsr_stat & DW_LSR_FE) {
        if (usart_priv->cb_event) {
            usart_priv->cb_event(idx, USART_EVENT_RX_FRAMING_ERROR);
        }

        return;

    }

    /** Framing Error bit. This is used to indicate the occurrence of a
      * framing error in the receiver. A framing error occurs when the
      * receiver does not detect a valid STOP bit in the received data.
      */
    if (lsr_stat & DW_LSR_PE) {
        if (usart_priv->cb_event) {
            usart_priv->cb_event(idx, USART_EVENT_RX_PARITY_ERROR);
        }

        return;

    }

    /** Overrun error bit. This is used to indicate the occurrence of an overrun error.
      * This occurs if a new data character was received before the previous data was read.
      */
    if (lsr_stat & DW_LSR_OE) {
        if (usart_priv->cb_event) {
            usart_priv->cb_event(idx, USART_EVENT_RX_OVERFLOW);
        }

        return;

    }

}