/**************************************************************************//**
 * @file     main.c
 * @version  V2.00
 * @brief    NUC029xEE Series GPIO Driver Sample Code
 *
 * @note
 * Copyright (C) 2018 Nuvoton Technology Corp. All rights reserved.
 ******************************************************************************/
#include <stdio.h>
#include "NuMicro.h"


#define PLLCON_SETTING  CLK_PLLCON_72MHz_HXT
#define PLL_CLOCK       72000000


/**
 * @brief       GPIO PA/PB IRQ
 *
 * @param       None
 *
 * @return      None
 *
 * @details     The PA/PB default IRQ, declared in startup_NUC029xEE.s.
 */
void GPAB_IRQHandler(void)
{
    /* To check if PB.3 interrupt occurred */
    if(GPIO_GET_INT_FLAG(PB, BIT3)) {
        GPIO_CLR_INT_FLAG(PB, BIT3);
        printf("PB.3 INT occurred.\n");
    } else {
        /* Un-expected interrupt. Just clear all PA, PB interrupts */
        PA->ISRC = PA->ISRC;
        PB->ISRC = PB->ISRC;
        printf("Un-expected interrupts.\n");
    }
}

/**
 * @brief       GPIO PC/PD/PE/PF IRQ
 *
 * @param       None
 *
 * @return      None
 *
 * @details     The PC/PD/PE/PF default IRQ, declared in startup_NUC029xEE.s.
 */
void GPCDEF_IRQHandler(void)
{
    /* To check if PE.5 interrupt occurred */
    if(GPIO_GET_INT_FLAG(PE, BIT5)) {
        GPIO_CLR_INT_FLAG(PE, BIT5);
        printf("PE.5 INT occurred.\n");
    } else {
        /* Un-expected interrupt. Just clear all PC, PD, PE and PF interrupts */
        PC->ISRC = PC->ISRC;
        PE->ISRC = PE->ISRC;
        PF->ISRC = PF->ISRC;
        printf("Un-expected interrupts.\n");
    }
}

void SYS_Init(void)
{
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init System Clock                                                                                       */
    /*---------------------------------------------------------------------------------------------------------*/

    /* Enable Internal RC 22.1184MHz clock */
    CLK->PWRCON |= CLK_PWRCON_OSC22M_EN_Msk;

    /* Waiting for Internal RC clock ready */
    while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_OSC22M_STB_Msk));

    /* Switch HCLK clock source to Internal RC and HCLK source divide 1 */
    CLK->CLKSEL0 = (CLK->CLKSEL0 & (~CLK_CLKSEL0_HCLK_S_Msk)) | CLK_CLKSEL0_HCLK_S_HIRC;
    CLK->CLKDIV = (CLK->CLKDIV & (~CLK_CLKDIV_HCLK_N_Msk)) | CLK_CLKDIV_HCLK(1);

    /* Set PLL to power down mode and PLL_STB bit in CLKSTATUS register will be cleared by hardware */
    CLK->PLLCON |= CLK_PLLCON_PD_Msk;        
    
    /* Enable external XTAL 12MHz clock */
    CLK->PWRCON |= CLK_PWRCON_XTL12M_EN_Msk;

    /* Waiting for external XTAL clock ready */
    while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_XTL12M_STB_Msk));

    /* System optimization when CPU runs at 72MHz */
    FMC->FATCON |= 0x50;

    /* Set core clock as PLL_CLOCK from PLL */
    CLK->PLLCON = PLLCON_SETTING;
    while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_PLL_STB_Msk));
    CLK->CLKSEL0 = (CLK->CLKSEL0 & (~CLK_CLKSEL0_HCLK_S_Msk)) | CLK_CLKSEL0_HCLK_S_PLL;

    /* Update System Core Clock */
    /* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CycylesPerUs automatically. */
    //SystemCoreClockUpdate();
    PllClock        = PLL_CLOCK;            // PLL
    SystemCoreClock = PLL_CLOCK / 1;        // HCLK
    CyclesPerUs     = PLL_CLOCK / 1000000;  // For CLK_SysTickDelay()

    /* Enable UART module clock */
    CLK->APBCLK |= CLK_APBCLK_UART0_EN_Msk;

    /* Select UART module clock source */
    CLK->CLKSEL1 = (CLK->CLKSEL1 & (~CLK_CLKSEL1_UART_S_Msk)) | CLK_CLKSEL1_UART_S_HXT;

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

    /* Set GPB multi-function pins for UART0 RXD and 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()
{
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init UART                                                                                               */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Reset UART0 */
    SYS->IPRSTC2 |=  SYS_IPRSTC2_UART0_RST_Msk;
    SYS->IPRSTC2 &= ~SYS_IPRSTC2_UART0_RST_Msk;

    /* Configure UART0 and set UART0 Baudrate */
    UART0->BAUD = UART_BAUD_MODE2 | UART_BAUD_MODE2_DIVIDER(__HXT, 115200);
    UART0->LCR = UART_WORD_LEN_8 | UART_PARITY_NONE | UART_STOP_BIT_1;
}

/*---------------------------------------------------------------------------------------------------------*/
/* MAIN function                                                                                           */
/*---------------------------------------------------------------------------------------------------------*/
int 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();

    printf("\n\nCPU @ %d Hz\n", SystemCoreClock);
    printf("+------------------------------------------------+\n");
    printf("|    GPIO PB.3 and PE.5 Interrupt Sample Code    |\n");
    printf("+------------------------------------------------+\n\n");

    /*-----------------------------------------------------------------------------------------------------*/
    /* GPIO Interrupt Function Test                                                                        */
    /*-----------------------------------------------------------------------------------------------------*/
    printf("PB.3 and PE.5 are used to test interrupt ......\n");

    /* Configure PB.3 as Input mode and enable interrupt by rising edge trigger */
    PB->PMD = (PB->PMD & (~GPIO_PMD_PMD3_Msk)) | (GPIO_PMD_INPUT << GPIO_PMD_PMD3_Pos);
    PB->IMD |= (GPIO_IMD_EDGE << 3);
    PB->IEN |= (BIT3 << GPIO_IEN_IR_EN_Pos);
    NVIC_EnableIRQ(GPAB_IRQn);

    /*  Configure PE.5 as Quasi-bidirection mode and enable interrupt by falling edge trigger */
    PE->PMD = (PE->PMD & (~GPIO_PMD_PMD5_Msk)) | (GPIO_PMD_QUASI << GPIO_PMD_PMD5_Pos);
    PE->IMD |= (GPIO_IMD_EDGE << 5);
    PE->IEN |= (BIT5 << GPIO_IEN_IF_EN_Pos);
    NVIC_EnableIRQ(GPCDEF_IRQn);

    /* Waiting for interrupts */
    while(1);
}

/*** (C) COPYRIGHT 2018 Nuvoton Technology Corp. ***/
