/****************************************************************************
 * @file     main.c
 * @version  V3.00
 * $Revision: 2 $
 * $Date: 16/10/25 4:27p $
 * @brief
 *           Transmit and receive data in UART IrDA mode.
 *           This sample code needs to work with UART_IrDA_Master.
 * @note
 * @copyright SPDX-License-Identifier: Apache-2.0
 *
 * @copyright 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 functions prototype                                                                              */
/*---------------------------------------------------------------------------------------------------------*/
extern char GetChar(void);
int32_t main(void);
void IrDA_FunctionRxTest(void);


/*---------------------------------------------------------------------------------------------------------*/
/*  IrDA Function Receive Test                                                                             */
/*---------------------------------------------------------------------------------------------------------*/
void IrDA_FunctionRxTest()
{
    uint8_t u8InChar = 0xFF;
    uint32_t u32TimeOutCnt;

    printf("\n");
    printf("+-----------------------------------------------------------+\n");
    printf("|     Pin Configure                                         |\n");
    printf("+-----------------------------------------------------------+\n");
    printf("|  ______                                          _______  |\n");
    printf("| |      |                                        |       | |\n");
    printf("| |Master|--UART1_TXD(PB.3) <==> UART1_RXD(PB.2)--|Slave  | |\n");
    printf("| |      |                                        |       | |\n");
    printf("| |______|                                        |_______| |\n");
    printf("|                                                           |\n");
    printf("+-----------------------------------------------------------+\n");

    printf("\n");
    printf("+-----------------------------------------------------------+\n");
    printf("|     IrDA Function Test                                    |\n");
    printf("+-----------------------------------------------------------+\n");
    printf("|  Description :                                            |\n");
    printf("|    The sample code needs two boards. One is Master and    |\n");
    printf("|    the other is slave.  Master will send data based on    |\n");
    printf("|    terminal input and Slave will printf received data on  |\n");
    printf("|    terminal screen.                                       |\n");
    printf("+-----------------------------------------------------------+\n");

    /*
        UART0 is set to debug port and connect with PC firstly.
        The IrDA sample code needs two module board to execute.
        Set the master board is IrDA TX Mode and the other is IrDA Rx mode.
        Inputting char on terminal will be sent to the UART0 of master.
        After the master receiving, the inputting char will send to UART0 again.
        At the same time, it also sends to UART1 TX pin by IrDA mode.
        Slave will print received char after UART1 send out.
        Note that IrDA mode is ONLY used when baud rate equation is selected mode 0.

    */

    printf("\n");
    printf("+-----------------------------------------------------------+\n");
    printf("|     IrDA Function Mode Test (Slave)                       |\n");
    printf("+-----------------------------------------------------------+\n");
    printf("| 1). Polling RDA_Flag to check data input though UART1     |\n");
    printf("| 2). If received data is '0', the program will exit.       |\n");
    printf("|     Otherwise, print received data on terminal            |\n");
    printf("+-----------------------------------------------------------+\n\n");

    /* In IrDA Mode, Baud Rate configuration must be used MODE0 */
    UART1->BAUD = UART_BAUD_MODE0 | UART_BAUD_MODE0_DIVIDER(__HXT, 57600);

    /* IrDA Function Enable */
    UART1->FUNCSEL = UART_FUNCSEL_IrDA;

    /* Set IrDA Rx mode */
    UART1->IRDA &= ~UART_IRDA_TXEN_Msk;
    UART1->IRDA |= UART_IRDA_RXINV_Msk;     //Rx signal is inverse

    /* Reset Rx FIFO */
    UART1->FIFO |= UART_FIFO_RXRST_Msk;
    u32TimeOutCnt = SystemCoreClock; /* 1 second time-out */
    while(UART1->FIFO & UART_FIFO_RXRST_Msk)
        if(--u32TimeOutCnt == 0) break;

    printf("Waiting...\n");

    /* Use polling method to wait master data */
    do
    {
        if(UART1->INTSTS & UART_INTSTS_RDAIF_Msk)
        {
            u8InChar = UART1->DAT;;
            printf("   Input: %c \n", u8InChar);
        }
    }
    while(u8InChar != '0');

}

void SYS_Init(void)
{
	uint32_t u32TimeOutCnt;


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

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

    /* Wait for HIRC clock ready */
    u32TimeOutCnt = __HIRC;
    while(!(CLK->STATUS & CLK_STATUS_HIRCSTB_Msk))
		if(--u32TimeOutCnt == 0) break;

    /* 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 */
    u32TimeOutCnt = __HIRC;
    while(!(CLK->STATUS & CLK_STATUS_HXTSTB_Msk))
		if(--u32TimeOutCnt == 0) break;

    /* Set core clock as PLL_CLOCK from PLL */
    CLK->PLLCTL = PLLCTL_SETTING;
    u32TimeOutCnt = __HIRC;
    while(!(CLK->STATUS & CLK_STATUS_PLLSTB_Msk))
		if(--u32TimeOutCnt == 0) break;
    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 module clock */
    CLK->APBCLK0 |= (CLK_APBCLK0_UART0CKEN_Msk | CLK_APBCLK0_UART1CKEN_Msk);

    /* Select UART module clock source as HXT and UART module clock divider as 1 */
    CLK->CLKSEL1 = (CLK->CLKSEL1 & (~CLK_CLKSEL1_UARTSEL_Msk)) | CLK_CLKSEL1_UARTSEL_HXT;
    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 PB multi-function pins for UART1 RXD(PB.2) and TXD(PB.3) */
    SYS->GPB_MFPL = (SYS->GPB_MFPL & (~SYS_GPB_MFPL_PB2MFP_Msk)) | SYS_GPB_MFPL_PB2MFP_UART1_RXD;
    SYS->GPB_MFPL = (SYS->GPB_MFPL & (~SYS_GPB_MFPL_PB3MFP_Msk)) | SYS_GPB_MFPL_PB3MFP_UART1_TXD;

}

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(__HXT, 115200);
    UART0->LINE = UART_WORD_LEN_8 | UART_PARITY_NONE | UART_STOP_BIT_1;
}

void UART1_Init()
{
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init UART                                                                                               */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Reset UART1 */
    SYS->IPRST1 |=  SYS_IPRST1_UART1RST_Msk;
    SYS->IPRST1 &= ~SYS_IPRST1_UART1RST_Msk;

    /* Configure UART1 and set UART1 baud rate */
    UART1->BAUD = UART_BAUD_MODE2 | UART_BAUD_MODE2_DIVIDER(__HXT, 115200);
    UART1->LINE = UART_WORD_LEN_8 | UART_PARITY_NONE | UART_STOP_BIT_1;
}

/*---------------------------------------------------------------------------------------------------------*/
/* 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 UART1 for testing */
    UART1_Init();

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

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

    printf("\nUART Sample Program\n");

    /* UART sample IrDA Slave function */
    IrDA_FunctionRxTest();

    while(1);

}
