/**************************************************************************//**
 * @file     Smpl_DrvFMC.c
 * @version  V2.00
 * $Revision: 2 $
 * $Date: 16/10/25 4:26p $
 * @brief
 *           Implement a multi-boot system to boot from different applications in APROM.
 *           A LDROM code and 4 APROM code are implemented in this sample code.
 * @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

#if !defined(__ICCARM__)
extern uint32_t Image$$RO$$Base;
#endif

int32_t g_FMC_i32ErrCode;

void SYS_Init(void)
{
	uint32_t u32TimeOutCnt;

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

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

    /* Waiting 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_HCLKSEL_Msk;
    CLK->CLKSEL0 |= CLK_CLKSEL0_HCLKSEL_HIRC;
    CLK->CLKDIV0 &= ~CLK_CLKDIV0_HCLKDIV_Msk;
    CLK->CLKDIV0 |= CLK_CLKDIV0_HCLK(1);

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

    /* Waiting 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_HCLKSEL_Msk);
    CLK->CLKSEL0 |= CLK_CLKSEL0_HCLKSEL_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 and I2C controller */
    CLK->APBCLK0 |= CLK_APBCLK0_UART0CKEN_Msk;

    /* Select UART module clock source as HXT */
    CLK->CLKSEL1 &= ~CLK_CLKSEL1_UARTSEL_Msk;
    CLK->CLKSEL1 |= CLK_CLKSEL1_UARTSEL_HXT;

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

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

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

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

/*---------------------------------------------------------------------------------------------------------*/
/*  Main Function                                                                                          */
/*---------------------------------------------------------------------------------------------------------*/
int32_t main(void)
{
    uint8_t ch;
    uint32_t u32Data;
    uint32_t u32Cfg;

    /* Unlock protected registers for ISP function */
    SYS_UnlockReg();

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

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

    /* Enable ISP function */
    FMC->ISPCTL |= FMC_ISPCTL_ISPEN_Msk;

    /*
        This sample code shows how to boot with different firmware images in APROM.
        In the code, VECMAP is used to implement multi-boot function. Software set VECMAP
        to remap page of VECMAP to 0x0~0x1ff.
        NOTE: VECMAP only valid when CBS = 00'b or 10'b.

        To use this sample code, please:
        1. Build all targets and download to device individually. The targets are:
            FMC_MultiBoot, RO=0x0
            FMC_Boot0, RO=0x1000
            FMC_Boot1, RO=0x2000
            FMC_Boot2, RO=0x3000
            FMC_Boot3, RO=0x4000
        2. Reset MCU to execute FMC_MultiBoot.

    */

    printf("\n\n");
    printf("+----------------------------------------------+\n");
    printf("|     Multi-Boot Sample Code                   |\n");
    printf("+----------------------------------------------+\n");

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

#if defined(__ICCARM__)
    printf("VECMAP = 0x%x\n", FMC_GetVECMAP());
#else
    printf("Current RO Base = 0x%x, VECMAP = 0x%x\n", (uint32_t)&Image$$RO$$Base, FMC_GetVECMAP());
#endif

    /* Check IAP mode */
    u32Cfg = FMC_Read(FMC_CONFIG_BASE);
    if((u32Cfg & 0xc0) != 0x80)
    {
        printf("Do you want to set to new IAP mode (APROM boot + LDROM)?\n");
        if(getchar() == 'y')
        {
            FMC->ISPCTL |= FMC_ISPCTL_CFGUEN_Msk; /* Enable user configuration update */

            /* Set CBS to b'10 */
            u32Cfg &= ~0xc0ul;
            u32Cfg |= 0x80;
            u32Data = FMC_Read(FMC_CONFIG_BASE + 0x4); /* Backup the data of config1 */
            FMC_Erase(FMC_CONFIG_BASE);
            FMC_Write(FMC_CONFIG_BASE, u32Cfg);
            FMC_Write(FMC_CONFIG_BASE + 0x4, u32Data);

            printf("Press any key to reset system to enable new IAP mode ...\n");
            getchar();
            SYS->IPRST0 = 0x1; /* Reset MCU */
            while(1);
        }
        else
        {
            printf("VECMAP only valid in new IAP mode. CBS = 10'b or 00'b\n");
            goto lexit;
        }
    }

    printf("Select one boot image: \n");
    printf("[0] Boot 0, base = 0x1000\n");
    printf("[1] Boot 1, base = 0x2000\n");
    printf("[2] Boot 2, base = 0x3000\n");
    printf("[3] Boot 3, base = 0x4000\n");
    printf("[Others] Boot, base = 0x0\n");

    ch = getchar();
    switch(ch)
    {
        case '0':
            FMC_SetVectorPageAddr(0x1000);
            break;
        case '1':
            FMC_SetVectorPageAddr(0x2000);
            break;
        case '2':
            FMC_SetVectorPageAddr(0x3000);
            break;
        case '3':
            FMC_SetVectorPageAddr(0x4000);
            break;
        default:
            FMC_SetVectorPageAddr(0x0);
            break;
    }

    /* Reset CPU only to reset to new vector page */
    SYS->IPRST0 |= SYS_IPRST0_CPURST_Msk;

    /* Reset System to reset to new vector page. */
    //NVIC_SystemReset();

    while(1);

lexit:

    /* Disable ISP function */
    FMC->ISPCTL &= ~FMC_ISPCTL_ISPEN_Msk;

    /* Lock protected registers */
    SYS_LockReg();

    printf("\nDone\n");
    while(SYS->PDID) __WFI();
}


/*** (C) COPYRIGHT 2016 Nuvoton Technology Corp. ***/
