small_water_meter_4g_src/Drivers/Board/lpuart0_drv.c

#include "board.h"

void lpuart0_drv_init(uint8_t baud)
{
    // LPUART0_RX: PD09(AF1)
    GpioInit(PD09_LPUART0_RXD, GPIO_DIG_IN_PULLUP_NONEDOWN);

    PeriClk_MutEnable(PeriClk_LpUart0);

    M0P_LPUART0->SCON = (0<<21) |     // FEIE, Frame error interrupt 0:close; 1:open;
                      (0<<17) |     // DMATXEN, TX DMAC handshake 0:close; 1:open;
                      (0<<16) |     // DMARXEN, RX DMAC handshake 0:close; 1:open;
                      (0<<14) |     // STOPBIT, Stop bit length, 0:1-bit; 1:1.5-bits; 2:2-bits; 3:RSV
                      (0<<13) |     // PEIE, Parity error interrupt 0:close; 1:open;
                      (baud<<11) |     // SCLKSEL, 0,1:PCLK; 2:XTL; 3:RCL;
                      (2<<9)  |     // OVER, 0:16x-sample; 1:8x-sample; 2:4x-sample; 
                      (0<<8)  |     // TXEIE, TX empty interrupt 0:close; 1:open;
                      (1<<6)  |     // SM, 0:mode0; 1:mode1; 2:mode2; 3:mode3;
                      (1<<4)  |     // REN, in mode1 0:TX only; 1:RX/TX
                      (0<<1)  |     // TCIE, Tx completed interrupt 0:close; 1:open;
                      (1<<0);       // RCIE, Rx completed interrupt 0:close; 1:open; 

    // BaudRate = fSCLK/(OVER*SCNT) = 16MHz/(4*35) = 114286 baud (-0.79%).
    if (baud == 3)
    {
        M0P_LPUART0->SCNT = 1; // 9600
    }
    else
    {
        M0P_LPUART0->SCNT = 35; // 115200
    }
    // enable interrupt at NVIC side
    IRQMutEnable(LPUART0_IRQn, NVIC_PRIO_3);
//    IRQMutEnable(LPUART1_IRQn, NVIC_PRIO_0);

    // LPUART0_TX: PD08(AF1)
   GpioInit(PD08_LPUART0_TXD,
         GPIO_DIG_OUT_STRN_PUSH_NONEUP_NONEDOWN);

    SerPlot.f.Preamble = 0xFFFFFFFF;
}

static uart_rx_itf Lpuart0RxItf;
void lpuart0_set_rx_itf(uart_rx_itf itf) {
    Lpuart0RxItf = itf;
}

// interrupt routine
void LPUART0_IRQHandler(void)
{
    union {
        uint32_t ISR;
        stc_uart_isr_field_t ISR_f;
    } IRQ;
#ifdef FINSH_TXBUF_DEPTH
    rt_base_t level;
#endif

    IRQ.ISR = M0P_LPUART0->ISR;
    M0P_LPUART0->ICR = ~IRQ.ISR;         // write 0 to clear interrupts

    // receive a ch
    if (IRQ.ISR_f.RC) {       
        Lpuart0RxItf(M0P_LPUART0->SBUF);
    }
    
    if (IRQ.ISR_f.TXE & M0P_LPUART0->SCON_f.TXEIE) {
#ifdef FINSH_TXBUF_DEPTH
        if (TxRaddr==TxWaddr){              // read FIFO to empty
            M0P_LPUART0->SCON_f.TXEIE = 0;    // disable tx interrupt source
        } else {
            M0P_LPUART0->SBUF = (uint32_t)TxBuf[TxRaddr];

            level = rt_hw_interrupt_disable();

            if (TxRaddr>=(FINSH_TXBUF_DEPTH-1)){
                TxRaddr = 0;
            } else {
                TxRaddr++;
            }

            rt_hw_interrupt_enable(level);
        }
#else
        M0P_LPUART0->SCON_f.TXEIE = 0;    // disable tx interrupt source
#endif
    }

//    CalExpireTime(120);
}

void lpuart0_tx_ch(char ch)
{
#ifdef FINSH_TXBUF_DEPTH
    // put a ch to TXBUF with nonblocking, drop it if almost full
    rt_base_t level;
    uint16_t used;

    while(1){
        used = TxWaddr - TxRaddr;
        if (TxWaddr<TxRaddr){
            used += FINSH_TXBUF_DEPTH;
        }
        if (used<(FINSH_TXBUF_DEPTH-1)){
            break;
        }
    }

    TxBuf[TxWaddr] = ch;

    level = rt_hw_interrupt_disable();

    if (TxWaddr>=(FINSH_TXBUF_DEPTH-1)){
        TxWaddr = 0;
    } else {
        TxWaddr++;
    }
    M0P_LPUART0->SCON_f.TXEIE = 1;    // enable tx interrupt source
#ifdef SLEEPDEEP_ENABLE
    SCB->SCR = (0x0<<SCB_SCR_SEVONPEND_Pos)    |
               (0x0<<SCB_SCR_SLEEPDEEP_Pos)    |   // sleep
               (0x0<<SCB_SCR_SLEEPONEXIT_Pos);
#endif

    rt_hw_interrupt_enable(level);

    return;
#else
    // put a ch to TX data register directly, wait if not empty
    while (M0P_LPUART0->ISR_f.TXE==0) {
        // wait until TX empty
    }

    M0P_LPUART0->SBUF = (uint32_t)ch;

//#ifdef SLEEPDEEP_ENABLE
//    // wait until TDR is moved to 32.768K clock domain
//    while (M0P_LPUART1->ISR_f.TXE==0) {
//        // wait until TX empty
//    }
//#endif

    return;
#endif
}

void lpuart0_tx_str(char *str)
{
    char ch;
    uint32_t ClkEn;
    uint32_t ClkOff;
	
#ifdef DEBUG_NB  //WXL2026-5-20
	  LOG("s:%s",str);
#endif
	
    ClkEn = M0P_SYSCTRL->PERI_CLKEN0;
    ClkOff = (~ClkEn) & (1u<<PeriClk_LpUart0);
    if (ClkOff) {
        return;
    }

    while(1){
        ch = *str++;

        if (ch=='\0'){
            return;
        }

        // fow windows, line end is "\r\n"
        //if (ch=='\n'){
        //    print_ch('\r');
        //}
        lpuart0_tx_ch(ch);
    }
}