/*************************************************************************//**
 * @file     main.c
 * @version  V1.00
 * $Revision: 1 $
 * $Date: 14/09/15 2:23p $
 * @brief    Use the timer periodic mode to generate timer interrupt every 1 second.
 *
 * @note
 * Copyright (C) 2013-2014 Nuvoton Technology Corp. All rights reserved.
*****************************************************************************/
#include <stdio.h>
#include "Nano100Series.h"

void TMR0_IRQHandler(void)
{
    static uint32_t sec = 1;
    printf("%d sec\n", sec++);

    // clear timer interrupt flag
    TIMER_ClearIntFlag(TIMER0);

}


void SYS_Init(void)
{
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init System Clock                                                                                       */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Unlock protected registers */
    SYS_UnlockReg();

    /* Enable External XTAL (4~24 MHz) */
    CLK_EnableXtalRC(CLK_PWRCTL_HXT_EN_Msk);

    /* Waiting for 12MHz clock ready */
    CLK_WaitClockReady( CLK_CLKSTATUS_HXT_STB_Msk);

    /* Switch HCLK clock source to HXT */
    CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HXT,CLK_HCLK_CLK_DIVIDER(1));

    /* Enable IP clock */
    CLK_EnableModuleClock(UART0_MODULE);
    CLK_EnableModuleClock(TMR0_MODULE);


    /* Select IP clock source */
    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_UART_CLK_DIVIDER(1));
    CLK_SetModuleClock(TMR0_MODULE, CLK_CLKSEL1_TMR0_S_HXT, 0);

    /* Update System Core Clock */
    /* User can use SystemCoreClockUpdate() to calculate SystemCoreClock. */
    SystemCoreClockUpdate();


    /*---------------------------------------------------------------------------------------------------------*/
    /* Init I/O Multi-function                                                                                 */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Set GPB multi-function pins for UART0 RXD and TXD */
    SYS->PB_L_MFP &= ~(SYS_PB_L_MFP_PB0_MFP_Msk | SYS_PB_L_MFP_PB1_MFP_Msk);
    SYS->PB_L_MFP |= (SYS_PB_L_MFP_PB1_MFP_UART0_TX | SYS_PB_L_MFP_PB0_MFP_UART0_RX);


    /* Lock protected registers */
    SYS_LockReg();
}


int main(void)
{
    int volatile i;

    /* Init System, IP clock and multi-function I/O
       In the end of SYS_Init() will issue SYS_LockReg()
       to lock protected register. If user want to write
       protected register, please issue SYS_UnlockReg()
       to unlock protected register if necessary */
    SYS_Init();

    /* Init UART to 115200-8n1 for print message */
    UART_Open(UART0, 115200);

    printf("\nThis sample code use timer to generate interrupt every 1 second \n");

    // Set timer frequency to 1Hz
    TIMER_Open(TIMER0, TIMER_PERIODIC_MODE, 1);

    // Enable timer interrupt
    TIMER_EnableInt(TIMER0);
    NVIC_EnableIRQ(TMR0_IRQn);


    // Start Timer 0
    TIMER_Start(TIMER0);

    while(1);

}

/*** (C) COPYRIGHT 2014 Nuvoton Technology Corp. ***/


