/**************************************************************************//**
 * @file     main.c
 * @version  V2.00
 * $Revision: 2 $
 * $Date: 15/04/10 5:06p $
 * @brief    NUC2201 Series Timer Driver Sample Code
 *
 * @note
 * @copyright SPDX-License-Identifier: Apache-2.0
 * @copyright Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
 ******************************************************************************/
#include <stdio.h>
#include "NuMicro.h"

#define PLL_CLOCK           72000000


/*---------------------------------------------------------------------------------------------------------*/
/* Global Interface Variables Declarations                                                                 */
/*---------------------------------------------------------------------------------------------------------*/
volatile uint32_t g_au32TMRINTCount[4] = {0};


/**
 * @brief       Timer0 IRQ
 *
 * @param       None
 *
 * @return      None
 *
 * @details     The Timer0 default IRQ, declared in startup_NUC2201.s.
 */
void TMR0_IRQHandler(void)
{
    if(TIMER_GetIntFlag(TIMER0) == 1) {
        /* Clear Timer0 time-out interrupt flag */
        TIMER_ClearIntFlag(TIMER0);

        g_au32TMRINTCount[0]++;
    }
}

/**
 * @brief       Timer1 IRQ
 *
 * @param       None
 *
 * @return      None
 *
 * @details     The Timer1 default IRQ, declared in startup_NUC2201.s.
 */
void TMR1_IRQHandler(void)
{
    if(TIMER_GetIntFlag(TIMER1) == 1) {
        /* Clear Timer1 time-out interrupt flag */
        TIMER_ClearIntFlag(TIMER1);

        g_au32TMRINTCount[1]++;
    }
}

/**
 * @brief       Timer2 IRQ
 *
 * @param       None
 *
 * @return      None
 *
 * @details     The Timer2 default IRQ, declared in startup_NUC2201.s.
 */
void TMR2_IRQHandler(void)
{
    if(TIMER_GetIntFlag(TIMER2) == 1) {
        /* Clear Timer2 time-out interrupt flag */
        TIMER_ClearIntFlag(TIMER2);

        g_au32TMRINTCount[2]++;
    }
}

/**
 * @brief       Timer3 IRQ
 *
 * @param       None
 *
 * @return      None
 *
 * @details     The Timer3 default IRQ, declared in startup_NUC2201.s.
 */
void TMR3_IRQHandler(void)
{
    if(TIMER_GetIntFlag(TIMER3) == 1) {
        /* Clear Timer3 time-out interrupt flag */
        TIMER_ClearIntFlag(TIMER3);

        g_au32TMRINTCount[3]++;
    }
}

void SYS_Init(void)
{
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init System Clock                                                                                       */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Enable Internal RC 22.1184MHz clock */
    CLK_EnableXtalRC(CLK_PWRCON_OSC22M_EN_Msk);

    /* Waiting for Internal RC clock ready */
    CLK_WaitClockReady(CLK_CLKSTATUS_OSC22M_STB_Msk);

    /* Switch HCLK clock source to Internal RC and HCLK source divide 1 */
    CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HIRC, CLK_CLKDIV_HCLK(1));

    /* Enable external XTAL 12MHz clock */
    CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk);

    /* Waiting for clock ready */
    CLK_WaitClockReady(CLK_CLKSTATUS_XTL12M_STB_Msk);

    /* Set core clock as PLL_CLOCK from PLL */
    CLK_SetCoreClock(PLL_CLOCK);
    
    /* Enable UART module clock */
    CLK_EnableModuleClock(UART0_MODULE);    
    
    /* Select UART module clock source */
    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_CLKDIV_UART(1));

    /* Enable Timer 0~3 module clock */
    CLK_EnableModuleClock(TMR0_MODULE);    
    CLK_EnableModuleClock(TMR1_MODULE);    
    CLK_EnableModuleClock(TMR2_MODULE);    
    CLK_EnableModuleClock(TMR3_MODULE);    

    /* Select Timer 0~3 module clock source */
    CLK_SetModuleClock(TMR0_MODULE, CLK_CLKSEL1_TMR0_S_HXT, NULL);
    CLK_SetModuleClock(TMR1_MODULE, CLK_CLKSEL1_TMR1_S_HCLK, NULL);
    CLK_SetModuleClock(TMR2_MODULE, CLK_CLKSEL1_TMR2_S_HIRC, NULL);
    CLK_SetModuleClock(TMR3_MODULE, CLK_CLKSEL1_TMR3_S_HXT, NULL);

    /*---------------------------------------------------------------------------------------------------------*/
    /* Init I/O Multi-function                                                                                 */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Set PB multi-function pins for UART0 RXD, TXD */
    SYS->GPB_MFP &= ~(SYS_GPB_MFP_PB0_Msk | SYS_GPB_MFP_PB1_Msk);
    SYS->GPB_MFP |= (SYS_GPB_MFP_PB0_UART0_RXD | SYS_GPB_MFP_PB1_UART0_TXD);
}

void UART0_Init(void)
{
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init UART                                                                                               */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Reset IP */
    SYS_ResetModule(UART0_RST);

    /* Configure UART0 and set UART0 Baudrate */
    UART_Open(UART0, 115200);
}

/*---------------------------------------------------------------------------------------------------------*/
/*  MAIN function                                                                                          */
/*---------------------------------------------------------------------------------------------------------*/
int main(void)
{
    volatile uint32_t u32InitCount;

    /* 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();

    printf("\n\nCPU @ %d Hz\n", SystemCoreClock);
    printf("+------------------------------------------------+\n");
    printf("|    Timer Periodic and Interrupt Sample Code    |\n");
    printf("+------------------------------------------------+\n\n");

    printf("# Timer Settings:\n");
    printf("  Timer0: Clock source 12 MHz;       Periodic mode; Enable interrupt; 1 interrupt tick/sec.\n");
    printf("  Timer1: Clock source HCLK(72 MHz); Periodic mode; Enable interrupt; 2 interrupt ticks/sec.\n");
    printf("  Timer2: Clock source HIRC(22 MHz); Periodic mode; Enable interrupt; 4 interrupt ticks/sec.\n");
    printf("  Timer3: Clock source 12 MHz;       Periodic mode; Enable interrupt; 8 interrupt ticks/sec.\n");
    printf("# Check Timer0 ~ Timer3 interrupt counts are reasonable or not.\n\n");

    /* Open Timer0 in periodic mode, enable interrupt and 1 interrupt tick per second */
    TIMER_Open(TIMER0, TIMER_PERIODIC_MODE, 1);
    TIMER_EnableInt(TIMER0);

    /* Open Timer1 in periodic mode, enable interrupt and 2 interrupt ticks per second */
    TIMER_Open(TIMER1, TIMER_PERIODIC_MODE, 2);
    TIMER_EnableInt(TIMER1);

    /* Open Timer2 in periodic mode, enable interrupt and 4 interrupt ticks per second */
    TIMER_Open(TIMER2, TIMER_PERIODIC_MODE, 4);
    TIMER_EnableInt(TIMER2);

    /* Open Timer3 in periodic mode, enable interrupt and 8 interrupt ticks per second */
    TIMER_Open(TIMER3, TIMER_PERIODIC_MODE, 8);
    TIMER_EnableInt(TIMER3);

    /* Enable Timer0 ~ Timer3 NVIC */
    NVIC_EnableIRQ(TMR0_IRQn);
    NVIC_EnableIRQ(TMR1_IRQn);
    NVIC_EnableIRQ(TMR2_IRQn);
    NVIC_EnableIRQ(TMR3_IRQn);

    /* Clear Timer0 ~ Timer3 interrupt counts to 0 */
    g_au32TMRINTCount[0] = g_au32TMRINTCount[1] = g_au32TMRINTCount[2] = g_au32TMRINTCount[3] = 0;
    u32InitCount = g_au32TMRINTCount[0];

    /* Start Timer0 ~ Timer3 counting */
    TIMER_Start(TIMER0);
    TIMER_Start(TIMER1);
    TIMER_Start(TIMER2);
    TIMER_Start(TIMER3);

    /* Check Timer0 ~ Timer3 interrupt counts */
    printf("# Timer interrupt counts :\n");
    while(u32InitCount < 20) {
        if(g_au32TMRINTCount[0] != u32InitCount) {
            printf("TMR0:%3d    TMR1:%3d    TMR2:%3d    TMR3:%3d\n",
                   g_au32TMRINTCount[0], g_au32TMRINTCount[1], g_au32TMRINTCount[2], g_au32TMRINTCount[3]);
            u32InitCount = g_au32TMRINTCount[0];

            if((g_au32TMRINTCount[1] > (g_au32TMRINTCount[0] * 2 + 1)) || (g_au32TMRINTCount[1] < (g_au32TMRINTCount[0] * 2 - 1)) ||
                    (g_au32TMRINTCount[2] > (g_au32TMRINTCount[0] * 4 + 1)) || (g_au32TMRINTCount[2] < (g_au32TMRINTCount[0] * 4 - 1)) ||
                    (g_au32TMRINTCount[3] > (g_au32TMRINTCount[0] * 8 + 1)) || (g_au32TMRINTCount[3] < (g_au32TMRINTCount[0] * 8 - 1))) {
                printf("*** FAIL ***\n");
                goto lexit;
            }
        }
    }

    printf("*** PASS ***\n");

lexit:

    while(1);
}

/*** (C) COPYRIGHT 2013 Nuvoton Technology Corp. ***/
