uart.c

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/**************************************************************************/
#include <stdio.h>
#include "M4521.h"
 
void UART_ClearIntFlag(UART_T* uart, uint32_t u32InterruptFlag)
{
 
    if(u32InterruptFlag & UART_INTSTS_RLSINT_Msk)   /* Clear Receive Line Status Interrupt */
    {
        uart->FIFOSTS = UART_FIFOSTS_BIF_Msk | UART_FIFOSTS_FEF_Msk | UART_FIFOSTS_PEF_Msk;
        uart->FIFOSTS = UART_FIFOSTS_ADDRDETF_Msk;
    }
 
    if(u32InterruptFlag & UART_INTSTS_MODEMINT_Msk)  /* Clear Modem Status Interrupt */
        uart->MODEMSTS |= UART_MODEMSTS_CTSDETF_Msk;
 
    if(u32InterruptFlag & UART_INTSTS_BUFERRINT_Msk)   /* Clear Buffer Error Interrupt */
    {
        uart->FIFOSTS = UART_FIFOSTS_RXOVIF_Msk | UART_FIFOSTS_TXOVIF_Msk;
    }
 
    if(u32InterruptFlag & UART_INTSTS_CTSWKIF_Msk)   /* Clear CTS Wake-up Interrupt */
    {
        uart->INTSTS = UART_INTSTS_CTSWKIF_Msk;
    }
 
    if(u32InterruptFlag & UART_INTSTS_DATWKIF_Msk)   /* Clear Data Wake-up Interrupt */
    {
        uart->INTSTS = UART_INTSTS_DATWKIF_Msk;
    }
}
 
 
void UART_Close(UART_T* uart)
{
    uart->INTEN = 0;
}
 
 
void UART_DisableFlowCtrl(UART_T* uart)
{
    uart->INTEN &= ~(UART_INTEN_ATORTSEN_Msk | UART_INTEN_ATOCTSEN_Msk);
}
 
 
void UART_DisableInt(UART_T*  uart, uint32_t u32InterruptFlag)
{
    /* Disable UART specified interrupt */
    UART_DISABLE_INT(uart, u32InterruptFlag);
}
 
 
void UART_EnableFlowCtrl(UART_T* uart)
{
    /* Set RTS pin output is low level active */
    uart->MODEM |= UART_MODEM_RTSACTLV_Msk;
 
    /* Set CTS pin input is low level active */
    uart->MODEMSTS |= UART_MODEMSTS_CTSACTLV_Msk;
 
    /* Set RTS and CTS auto flow control enable */
    uart->INTEN |= UART_INTEN_ATORTSEN_Msk | UART_INTEN_ATOCTSEN_Msk;
}
 
 
void UART_EnableInt(UART_T*  uart, uint32_t u32InterruptFlag)
{
    /* Enable UART specified interrupt */
    UART_ENABLE_INT(uart, u32InterruptFlag);
}
 
 
void UART_Open(UART_T* uart, uint32_t u32baudrate)
{
    uint8_t u8UartClkSrcSel, u8UartClkDivNum;
    uint32_t u32ClkTbl[4] = {__HXT, 0, __LXT, __HIRC};
    uint32_t u32Baud_Div = 0;
 
    /* Get UART clock source selection */
    u8UartClkSrcSel = (CLK->CLKSEL1 & CLK_CLKSEL1_UARTSEL_Msk) >> CLK_CLKSEL1_UARTSEL_Pos;
 
    /* Get UART clock divider number */
    u8UartClkDivNum = (CLK->CLKDIV0 & CLK_CLKDIV0_UARTDIV_Msk) >> CLK_CLKDIV0_UARTDIV_Pos;
 
    /* Select UART function */
    uart->FUNCSEL = UART_FUNCSEL_UART;
 
    /* Set UART line configuration */
    uart->LINE = UART_WORD_LEN_8 | UART_PARITY_NONE | UART_STOP_BIT_1;
 
    /* Set UART Rx and RTS trigger level */
    uart->FIFO &= ~(UART_FIFO_RFITL_Msk | UART_FIFO_RTSTRGLV_Msk);
 
    /* Get PLL clock frequency if UART clock source selection is PLL */
    if(u8UartClkSrcSel == 1)
        u32ClkTbl[u8UartClkSrcSel] = CLK_GetPLLClockFreq();
 
    /* Set UART baud rate */
    if(u32baudrate != 0)
    {
        u32Baud_Div = UART_BAUD_MODE2_DIVIDER((u32ClkTbl[u8UartClkSrcSel]) / (u8UartClkDivNum + 1), u32baudrate);
 
        if(u32Baud_Div > 0xFFFF)
            uart->BAUD = (UART_BAUD_MODE0 | UART_BAUD_MODE0_DIVIDER((u32ClkTbl[u8UartClkSrcSel]) / (u8UartClkDivNum + 1), u32baudrate));
        else
            uart->BAUD = (UART_BAUD_MODE2 | u32Baud_Div);
    }
}
 
 
uint32_t UART_Read(UART_T* uart, uint8_t *pu8RxBuf, uint32_t u32ReadBytes)
{
    uint32_t  u32Count, u32delayno;
    uint32_t  u32Timeout = 3 * SystemCoreClock; // timeout 3 second
 
    for(u32Count = 0; u32Count < u32ReadBytes; u32Count++)
    {
        u32delayno = 0;
 
        while(uart->FIFOSTS & UART_FIFOSTS_RXEMPTY_Msk)   /* Check RX empty => failed */
        {
            u32delayno++;
            if(u32delayno >= u32Timeout)
                return u32Count;
        }
        pu8RxBuf[u32Count] = uart->DAT;    /* Get Data from UART RX  */
    }
 
    return u32Count;
 
}
 
 
void UART_SetLine_Config(UART_T* uart, uint32_t u32baudrate, uint32_t u32data_width, uint32_t u32parity, uint32_t  u32stop_bits)
{
    uint8_t u8UartClkSrcSel, u8UartClkDivNum;
    uint32_t u32ClkTbl[4] = {__HXT, 0, __LXT, __HIRC};
    uint32_t u32Baud_Div = 0;
 
    /* Get UART clock source selection */
    u8UartClkSrcSel = (CLK->CLKSEL1 & CLK_CLKSEL1_UARTSEL_Msk) >> CLK_CLKSEL1_UARTSEL_Pos;
 
    /* Get UART clock divider number */
    u8UartClkDivNum = (CLK->CLKDIV0 & CLK_CLKDIV0_UARTDIV_Msk) >> CLK_CLKDIV0_UARTDIV_Pos;
 
    /* Get PLL clock frequency if UART clock source selection is PLL */
    if(u8UartClkSrcSel == 1)
        u32ClkTbl[u8UartClkSrcSel] = CLK_GetPLLClockFreq();
 
    /* Set UART baud rate */
    if(u32baudrate != 0)
    {
        u32Baud_Div = UART_BAUD_MODE2_DIVIDER((u32ClkTbl[u8UartClkSrcSel]) / (u8UartClkDivNum + 1), u32baudrate);
 
        if(u32Baud_Div > 0xFFFF)
            uart->BAUD = (UART_BAUD_MODE0 | UART_BAUD_MODE0_DIVIDER((u32ClkTbl[u8UartClkSrcSel]) / (u8UartClkDivNum + 1), u32baudrate));
        else
            uart->BAUD = (UART_BAUD_MODE2 | u32Baud_Div);
    }
 
    /* Set UART line configuration */
    uart->LINE = u32data_width | u32parity | u32stop_bits;
}
 
 
void UART_SetTimeoutCnt(UART_T* uart, uint32_t u32TOC)
{
    /* Set time-out interrupt comparator */
    uart->TOUT = (uart->TOUT & ~UART_TOUT_TOIC_Msk) | (u32TOC);
 
    /* Set time-out counter enable */
    uart->INTEN |= UART_INTEN_TOCNTEN_Msk;
}
 
 
void UART_SelectIrDAMode(UART_T* uart, uint32_t u32Buadrate, uint32_t u32Direction)
{
    uint8_t u8UartClkSrcSel, u8UartClkDivNum;
    uint32_t u32ClkTbl[4] = {__HXT, 0, __LXT, __HIRC};
    uint32_t u32Baud_Div;
 
    /* Select IrDA function mode */
    uart->FUNCSEL = UART_FUNCSEL_IrDA;
 
    /* Get UART clock source selection */
    u8UartClkSrcSel = (CLK->CLKSEL1 & CLK_CLKSEL1_UARTSEL_Msk) >> CLK_CLKSEL1_UARTSEL_Pos;
 
    /* Get UART clock divider number */
    u8UartClkDivNum = (CLK->CLKDIV0 & CLK_CLKDIV0_UARTDIV_Msk) >> CLK_CLKDIV0_UARTDIV_Pos;
 
    /* Get PLL clock frequency if UART clock source selection is PLL */
    if(u8UartClkSrcSel == 1)
        u32ClkTbl[u8UartClkSrcSel] = CLK_GetPLLClockFreq();
 
    /* Set UART IrDA baud rate in mode 0 */
    if(u32Buadrate != 0)
    {
        u32Baud_Div = UART_BAUD_MODE0_DIVIDER((u32ClkTbl[u8UartClkSrcSel]) / (u8UartClkDivNum + 1), u32Buadrate);
 
        if(u32Baud_Div < 0xFFFF)
            uart->BAUD = (UART_BAUD_MODE0 | u32Baud_Div);
    }
 
    /* Configure IrDA relative settings */
    if(u32Direction == UART_IRDA_RXEN)
    {
        uart->IRDA |= UART_IRDA_RXINV_Msk;     //Rx signal is inverse
        uart->IRDA &= ~UART_IRDA_TXEN_Msk;
    }
    else
    {
        uart->IRDA &= ~UART_IRDA_TXINV_Msk;    //Tx signal is not inverse
        uart->IRDA |= UART_IRDA_TXEN_Msk;
    }
 
}
 
 
void UART_SelectRS485Mode(UART_T* uart, uint32_t u32Mode, uint32_t u32Addr)
{
    /* Select UART RS485 function mode */
    uart->FUNCSEL = UART_FUNCSEL_RS485;
 
    /* Set RS585 configuration */
    uart->ALTCTL &= ~(UART_ALTCTL_RS485NMM_Msk | UART_ALTCTL_RS485AUD_Msk | UART_ALTCTL_RS485AAD_Msk | UART_ALTCTL_ADDRMV_Msk);
    uart->ALTCTL |= (u32Mode | (u32Addr << UART_ALTCTL_ADDRMV_Pos));
}
 
 
 
 
uint32_t UART_Write(UART_T* uart, uint8_t *pu8TxBuf, uint32_t u32WriteBytes)
{
    uint32_t  u32Count, u32delayno;
    uint32_t  u32Exit = 0ul;
    uint32_t  u32Timeout = 3 * SystemCoreClock; // timeout 3 second
 
    for (u32Count = 0ul; u32Count != u32WriteBytes; u32Count++)
    {
        u32delayno = 0ul;
 
        while (uart->FIFOSTS & UART_FIFOSTS_TXFULL_Msk)   /* Check Tx Full */
        {
            u32delayno++;
 
            if (u32delayno >= u32Timeout)
            {
                u32Exit = 1ul;
                break;
            }
        }
 
        if (u32Exit == 1ul)
        {
            break;
        }
        else
        {
            uart->DAT = pu8TxBuf[u32Count];    /* Send UART Data from buffer */
        }
    }
 
    return u32Count;
 
}
 
 /* end of group UART_EXPORTED_FUNCTIONS */
 /* end of group UART_Driver */
 /* end of group Standard_Driver */
 
/*** (C) COPYRIGHT 2022 Nuvoton Technology Corp. ***/