/**************************************************************************//**
 * @file     main.c
 * @version  V3.00
 * $Revision: 2 $
 * $Date: 16/10/25 4:28p $
 * @brief
 *           Transmit and receive data in RS485 mode.
 *           This sample code needs to work with USCI_UART_RS485_Master.
 * @note
 * Copyright (C) 2016 Nuvoton Technology Corp. All rights reserved.
 *
 ******************************************************************************/
#include "stdio.h"
#include "NUC126.h"


#define PLLCTL_SETTING  CLK_PLLCTL_72MHz_HXT
#define PLL_CLOCK       72000000


#define ADDR_NUM 4
#define DATA_NUM 10


/*---------------------------------------------------------------------------------------------------------*/
/* Global variable                                                                                         */
/*---------------------------------------------------------------------------------------------------------*/
uint32_t u32AddrBuffer[ADDR_NUM];
uint32_t u32DataBuffer[ADDR_NUM][DATA_NUM];
volatile uint8_t u8AddrIndex = 0;
volatile uint8_t u8DataIndex = 0;
volatile uint8_t u8ReceiveDone = 0;


/*---------------------------------------------------------------------------------------------------------*/
/* Define functions prototype                                                                              */
/*---------------------------------------------------------------------------------------------------------*/
extern char GetChar(void);
void RS485_HANDLE(void);
void RS485_9bitModeSlave(void);
void RS485_FunctionTest(void);


/*---------------------------------------------------------------------------------------------------------*/
/* ISR to handle USCI interrupt event                                                                      */
/*---------------------------------------------------------------------------------------------------------*/
void USCI_IRQHandler(void)
{
    RS485_HANDLE();
}


/*---------------------------------------------------------------------------------------------------------*/
/* RS485 Callback function                                                                                 */
/*---------------------------------------------------------------------------------------------------------*/
void RS485_HANDLE()
{
    volatile uint32_t u32ProtSts = UUART0->PROTSTS;
    volatile uint32_t u32BufSts = UUART0->BUFSTS;
    volatile uint32_t u32Data;

    if(u32ProtSts & UUART_PROTSTS_RXENDIF_Msk)      /* Receive end interrupt */
    {
        /* Handle received data */
        UUART_CLR_PROT_INT_FLAG(UUART0, UUART_PROTSTS_RXENDIF_Msk);
        u32Data = UUART0->RXDAT;

        if(u32Data & 0x100)
            u32AddrBuffer[u8AddrIndex++] = u32Data;
        else
        {
            u32DataBuffer[u8AddrIndex - 1][u8DataIndex++] = u32Data;

            if(u8DataIndex == DATA_NUM)
            {
                if(u8AddrIndex == ADDR_NUM)
                    u8ReceiveDone = 1;
                else
                    u8DataIndex = 0;
            }
        }
    }
    else if(u32BufSts & UUART_BUFSTS_RXOVIF_Msk)      /* Receive buffer over-run error interrupt */
    {
        UUART_CLR_BUF_INT_FLAG(UUART0, UUART_BUFSTS_RXOVIF_Msk);
        printf("\nBuffer Error...\n");
    }
}

/*---------------------------------------------------------------------------------------------------------*/
/*  RS485 Receive Test                                                                                     */
/*---------------------------------------------------------------------------------------------------------*/
void RS485_9bitModeSlave()
{
    /* Set UART line configuration and control signal output inverse */
    UUART0->LINECTL = UUART_WORD_LEN_9 | UUART_LINECTL_LSB_Msk | UUART_LINECTL_CTLOINV_Msk;

    /* Enable RTS auto direction function */
    UUART0->PROTCTL |= UUART_PROTCTL_RTSAUDIREN_Msk;

    printf("+-----------------------------------------------------------+\n");
    printf("|    RS485 Mode                                             |\n");
    printf("+-----------------------------------------------------------+\n");
    printf("| The function is used to test 9-bit slave mode.            |\n");
    printf("| Receive address and data byte.                            |\n");
    printf("+-----------------------------------------------------------+\n");

    /* Enable USCI receive end and receive buffer over-run error Interrupt */
    UUART_ENABLE_TRANS_INT(UUART0, UUART_INTEN_RXENDIEN_Msk);
    UUART_ENABLE_BUF_INT(UUART0, UUART_BUFCTL_RXOVIEN_Msk);
    NVIC_EnableIRQ(USCI_IRQn);

    printf("Ready to receive data...\n");

    /* Wait receive complete */
    while(u8ReceiveDone == 0);

    for(u8AddrIndex = 0; u8AddrIndex < ADDR_NUM; u8AddrIndex++)
    {
        printf("\nAddr=0x%x,Get:", (u32AddrBuffer[u8AddrIndex] & 0xFF));

        for(u8DataIndex = 0; u8DataIndex < DATA_NUM; u8DataIndex++)
            printf("%d,", (u32DataBuffer[u8AddrIndex][u8DataIndex] & 0xFF));
    }

    /* Disable USCI interrupt */
    UUART_DISABLE_TRANS_INT(UUART0, UUART_INTEN_RXENDIEN_Msk);
    UUART_DISABLE_BUF_INT(UUART0, UUART_BUFCTL_RXOVIEN_Msk);
    NVIC_DisableIRQ(USCI_IRQn);

    printf("\nEnd test\n");
}


/*---------------------------------------------------------------------------------------------------------*/
/*  RS485 Function Test                                                                                    */
/*---------------------------------------------------------------------------------------------------------*/
void RS485_FunctionTest()
{
    printf("\n");
    printf("+-----------------------------------------------------------+\n");
    printf("|     Pin Configure                                         |\n");
    printf("+-----------------------------------------------------------+\n");
    printf("|  ______                                            _____  |\n");
    printf("| |      |                                          |     | |\n");
    printf("| |Master|                                          |Slave| |\n");
    printf("| |    TX|--USCI0_DAT1(PC.1) <==> USCI0_DAT0(PC.0)--|RX   | |\n");
    printf("| |   RTS|--USCI0_CTL0(PC.2) <==> USCI0_CTL1(PC.2)--|RTS  | |\n");
    printf("| |______|                                          |_____| |\n");
    printf("|                                                           |\n");
    printf("+-----------------------------------------------------------+\n");


    /*
        The sample code is used to test RS485 9-bit mode and needs
        two Module test board to complete the test.

        Master:
            1.Set RTS auto durection enabled and HW will control RTS pin. CTLOINV is set to '1'.
            2.Master will send four different address with 10 bytes data to test Slave.
            3.Address bytes : the parity bit should be '1'.
            4.Data bytes : the parity bit should be '0'.
            5.RTS pin is low in idle state. When master is sending, RTS pin will be pull high.

        Slave:
            1.Set RTS auto durection enabled and HW will control RTS pin. CTLOINV is set to '1'.
            2.The received byte, parity bit is '1' , is considered "ADDRESS".
            3.The received byte, parity bit is '0' , is considered "DATA".
    */

    RS485_9bitModeSlave();

}

void SYS_Init(void)
{

    /*---------------------------------------------------------------------------------------------------------*/
    /* Init System Clock                                                                                       */
    /*---------------------------------------------------------------------------------------------------------*/

    /* Enable HIRC clock (Internal RC 22.1184MHz) */
    CLK->PWRCTL |= CLK_PWRCTL_HIRCEN_Msk;

    /* Wait for HIRC clock ready */
    while(!(CLK->STATUS & CLK_STATUS_HIRCSTB_Msk));

    /* Select HCLK clock source as HIRC and HCLK clock divider as 1 */
    CLK->CLKSEL0 = (CLK->CLKSEL0 & (~CLK_CLKSEL0_HCLKSEL_Msk)) | CLK_CLKSEL0_HCLKSEL_HIRC;
    CLK->CLKDIV0 = (CLK->CLKDIV0 & (~CLK_CLKDIV0_HCLKDIV_Msk)) | CLK_CLKDIV0_HCLK(1);

    /* Set PLL to Power-down mode */
    CLK->PLLCTL |= CLK_PLLCTL_PD_Msk;

    /* Enable HXT clock (external XTAL 12MHz) */
    CLK->PWRCTL |= CLK_PWRCTL_HXTEN_Msk;

    /* Wait for HXT clock ready */
    while(!(CLK->STATUS & CLK_STATUS_HXTSTB_Msk));

    /* Set core clock as PLL_CLOCK from PLL */
    CLK->PLLCTL = PLLCTL_SETTING;
    while(!(CLK->STATUS & CLK_STATUS_PLLSTB_Msk));
    CLK->CLKSEL0 = (CLK->CLKSEL0 & (~CLK_CLKSEL0_HCLKSEL_Msk)) | CLK_CLKSEL0_HCLKSEL_PLL;

    /* Update System Core Clock */
    PllClock        = PLL_CLOCK;            // PLL
    SystemCoreClock = PLL_CLOCK / 1;        // HCLK
    CyclesPerUs     = PLL_CLOCK / 1000000;  // For CLK_SysTickDelay()

    /* Enable UART and USCI module clock */
    CLK->APBCLK0 |= CLK_APBCLK0_UART0CKEN_Msk;
    CLK->APBCLK1 |= CLK_APBCLK1_USCI0CKEN_Msk;

    /* Select UART module clock source as HIRC and UART module clock divider as 1 */
    CLK->CLKSEL1 = (CLK->CLKSEL1 & (~CLK_CLKSEL1_UARTSEL_Msk)) | CLK_CLKSEL1_UARTSEL_HIRC;
    CLK->CLKDIV0 = (CLK->CLKDIV0 & (~CLK_CLKDIV0_UARTDIV_Msk)) | CLK_CLKDIV0_UART(1);

    /*---------------------------------------------------------------------------------------------------------*/
    /* Init I/O Multi-function                                                                                 */
    /*---------------------------------------------------------------------------------------------------------*/

    /* Set PD multi-function pins for UART0 RXD(PD.0) and TXD(PD.1) */
    SYS->GPD_MFPL = (SYS->GPD_MFPL & (~SYS_GPD_MFPL_PD0MFP_Msk)) | SYS_GPD_MFPL_PD0MFP_UART0_RXD;
    SYS->GPD_MFPL = (SYS->GPD_MFPL & (~SYS_GPD_MFPL_PD1MFP_Msk)) | SYS_GPD_MFPL_PD1MFP_UART0_TXD;

    /* Set PC multi-function pins for USCI0_DAT0(PC.0), USCI0_DAT1(PC.1) and USCI0_CTL1(PC.2) */
    SYS->GPC_MFPL = (SYS->GPC_MFPL & (~SYS_GPC_MFPL_PC0MFP_Msk)) | SYS_GPC_MFPL_PC0MFP_USCI0_DAT0;
    SYS->GPC_MFPL = (SYS->GPC_MFPL & (~SYS_GPC_MFPL_PC1MFP_Msk)) | SYS_GPC_MFPL_PC1MFP_USCI0_DAT1;
    SYS->GPC_MFPL = (SYS->GPC_MFPL & (~SYS_GPC_MFPL_PC2MFP_Msk)) | SYS_GPC_MFPL_PC2MFP_USCI0_CTL1;
}

void UART0_Init()
{
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init UART                                                                                               */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Reset UART0 */
    SYS->IPRST1 |=  SYS_IPRST1_UART0RST_Msk;
    SYS->IPRST1 &= ~SYS_IPRST1_UART0RST_Msk;

    /* Configure UART0 and set UART0 baud rate */
    UART0->BAUD = UART_BAUD_MODE2 | UART_BAUD_MODE2_DIVIDER(__HIRC, 115200);
    UART0->LINE = UART_WORD_LEN_8 | UART_PARITY_NONE | UART_STOP_BIT_1;
}

void USCI0_Init()
{
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init USCI                                                                                               */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Reset USCI0 */
    SYS->IPRST2 |=  SYS_IPRST2_USCI0RST_Msk;
    SYS->IPRST2 &= ~SYS_IPRST2_USCI0RST_Msk;

    /* Configure USCI0 as UART mode */
    UUART0->CTL = (2 << UUART_CTL_FUNMODE_Pos);                                 /* Set UART function mode */
    UUART0->LINECTL = UUART_WORD_LEN_8 | UUART_LINECTL_LSB_Msk;                 /* Set UART line configuration */
    UUART0->DATIN0 = (2 << UUART_DATIN0_EDGEDET_Pos);                           /* Set falling edge detection */
    UUART0->BRGEN = (103 << UUART_BRGEN_CLKDIV_Pos) | (5 << UUART_BRGEN_DSCNT_Pos); /* Set UART baud rate as 115200bps */
    UUART0->PROTCTL |= UUART_PROTCTL_PROTEN_Msk;                                /* Enable UART protocol */
}

/*---------------------------------------------------------------------------------------------------------*/
/*  Main Function                                                                                          */
/*---------------------------------------------------------------------------------------------------------*/
int32_t main(void)
{

    /* Unlock protected registers */
    SYS_UnlockReg();

    /* Init System, peripheral clock and multi-function I/O */
    SYS_Init();

    /* Lock protected registers */
    SYS_LockReg();

    /* Init UART0 for printf */
    UART0_Init();

    /* Init USCI0 for test */
    USCI0_Init();

    /*---------------------------------------------------------------------------------------------------------*/
    /* SAMPLE CODE                                                                                             */
    /*---------------------------------------------------------------------------------------------------------*/

    printf("\n\nCPU @ %d Hz\n", SystemCoreClock);

    printf("\nUSCI UART Sample Program\n");

    /* UART RS485 sample slave function */
    RS485_FunctionTest();

    while(1);

}
