/***************************************************************************//**
 * @file     main.c
 * @brief    ISP tool main function
 * @version  2.0.0
 *
 * @copyright SPDX-License-Identifier: Apache-2.0
 * @copyright Copyright (C) 2021 Nuvoton Technology Corp. All rights reserved.
 ******************************************************************************/
#include <stdio.h>
#include <string.h>
#include "targetdev.h"
#include "spi_transfer.h"

#define PLL_CLOCK 200000000

int32_t g_FMC_i32ErrCode = 0;

void ProcessHardFault(void);
void SH_Return(void);
void SendChar_ToUART(void);
void TIMER3_Init(void);
int32_t SYS_Init(void);

void ProcessHardFault(void) {}
void SH_Return(void) {}
void SendChar_ToUART(void) {}

/* Add implementations to fix linker warnings from the newlib-nano C library in VSCode-GCC14.3.1 */
void _close(void) {}
void _lseek(void) {}
void _read_r(void) {}
void _write_r(void) {}

uint32_t CLK_GetPLLClockFreq(void)
{
    return PLL_CLOCK;
}

uint32_t TIMER_Open(TIMER_T *timer, uint32_t u32Mode, uint32_t u32Freq)
{
    uint32_t u32Clk = __HIRC; // TIMER_GetModuleClock(timer);
    uint32_t u32Cmpr = 0UL, u32Prescale = 0UL;

    /* Fastest possible timer working freq is (u32Clk / 2). While cmpr = 2, prescaler = 0. */
    if(u32Freq > (u32Clk / 2UL))
    {
        u32Cmpr = 2UL;
    }
    else
    {
        u32Cmpr = u32Clk / u32Freq;
        u32Prescale = (u32Cmpr >> 24);  /* for 24 bits CMPDAT */

        if(u32Prescale > 0UL)
        {
            u32Cmpr = u32Cmpr / (u32Prescale + 1UL);
        }
    }

    timer->CTL = u32Mode | u32Prescale;
    timer->CMP = u32Cmpr;
    return (u32Clk / (u32Cmpr * (u32Prescale + 1UL)));
}

void TIMER3_Init(void)
{
    /* Enable IP clock */
    CLK->APBCLK0 |= CLK_APBCLK0_TMR3CKEN_Msk;
    /* Select IP clock source */
    CLK->CLKSEL1 = (CLK->CLKSEL1 & (~CLK_CLKSEL1_TMR3SEL_Msk)) | CLK_CLKSEL1_TMR3SEL_HIRC;
    // Set timer frequency to 3HZ
    TIMER_Open(TIMER3, TIMER_PERIODIC_MODE, 3);
    // Enable timer interrupt
    TIMER_EnableInt(TIMER3);
    // Start Timer 3
    TIMER_Start(TIMER3);
}

int32_t SYS_Init(void)
{
    uint32_t u32TimeOutCnt = 0;

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

    /* Enable HIRC clock */
    CLK->PWRCTL |= CLK_PWRCTL_HIRCEN_Msk;

    /* Wait for HIRC clock ready */
    u32TimeOutCnt = SystemCoreClock; /* 1 second time-out */
    while(!(CLK->STATUS & CLK_STATUS_HIRCSTB_Msk))
    {
        if(--u32TimeOutCnt == 0)
            return -1;
    }

    /* Set HCLK clock source as HIRC first */
    CLK->CLKSEL0 = (CLK->CLKSEL0 & (~CLK_CLKSEL0_HCLKSEL_Msk)) | CLK_CLKSEL0_HCLKSEL_HIRC;

    /* Disable PLL clock before setting PLL frequency */
    CLK->PLLCTL |= CLK_PLLCTL_PD_Msk;

    /* Set PLL clock as 200MHz from HIRC */
    CLK->PLLCTL = CLK_PLLCTL_200MHz_HIRC;

    /* Wait for PLL clock ready */
    u32TimeOutCnt = SystemCoreClock; /* 1 second time-out */
    while(!(CLK->STATUS & CLK_STATUS_PLLSTB_Msk))
    {
        if(--u32TimeOutCnt == 0)
            return -1;
    }

    /* Set power level by HCLK working frequency */
    SYS->PLCTL = (SYS->PLCTL & (~SYS_PLCTL_PLSEL_Msk)) | SYS_PLCTL_PLSEL_PL0;

    /* Set flash access cycle by HCLK working frequency */
    FMC->CYCCTL = (FMC->CYCCTL & (~FMC_CYCCTL_CYCLE_Msk)) | (8);

    /* Set PCLK0 and PCLK1 to HCLK/2 */
    CLK->PCLKDIV = (CLK_PCLKDIV_APB0DIV_DIV2 | CLK_PCLKDIV_APB1DIV_DIV2);

    /* Select HCLK clock source as PLL and HCLK source divider as 1 */
    CLK->CLKDIV0 = (CLK->CLKDIV0 & (~CLK_CLKDIV0_HCLKDIV_Msk)) | CLK_CLKDIV0_HCLK(1);
    CLK->CLKSEL0 = (CLK->CLKSEL0 & (~CLK_CLKSEL0_HCLKSEL_Msk)) | CLK_CLKSEL0_HCLKSEL_PLL;

    /* Update System Core Clock */
    PllClock        = 200000000;
    SystemCoreClock = 200000000;
    CyclesPerUs     = SystemCoreClock / 1000000;  /* For CLK_SysTickDelay() */

    /* Enable SPI1 module clock */
    CLK->APBCLK0 |= CLK_APBCLK0_SPI1CKEN_Msk;

    /* Select SPI1 module clock source as PCLK0 */
    CLK->CLKSEL2 = (CLK->CLKSEL2 & (~CLK_CLKSEL2_SPI1SEL_Msk)) | CLK_CLKSEL2_SPI1SEL_PCLK0;

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

    /* Setup SPI1 multi-function pins */
    SET_SPI1_MISO_PH4();
    SET_SPI1_MOSI_PH5();
    SET_SPI1_CLK_PH6();
    SET_SPI1_SS_PH7();

    /* Enable SPI1 clock pin (PH6) schmitt trigger */
    PH->SMTEN |= GPIO_SMTEN_SMTEN6_Msk;

    return 0;
}

/*---------------------------------------------------------------------------------------------------------*/
/*  Main Function                                                                                          */
/*---------------------------------------------------------------------------------------------------------*/
int main(void)
{
    uint32_t cmd_buff[16];

    /* Unlock protected registers */
    SYS_UnlockReg();

    /* Init System, peripheral clock and multi-function I/O */
    if(SYS_Init() < 0)
        goto _APROM;

    SPI_Init();
    TIMER3_Init();

    /* Enable ISP */
    CLK->AHBCLK0 |= CLK_AHBCLK0_ISPCKEN_Msk;
    FMC->ISPCTL |= (FMC_ISPCTL_ISPEN_Msk | FMC_ISPCTL_APUEN_Msk);

    /* Get APROM and Data Flash size */
    g_u32ApromSize = GetApromSize();
    GetDataFlashInfo(&g_u32DataFlashAddr, &g_u32DataFlashSize);

    while(1)
    {
        if(bSpiDataReady == 1)
        {
            goto _ISP;
        }

        if(TIMER3->INTSTS & TIMER_INTSTS_TIF_Msk)
        {
            goto _APROM;
        }
    }

_ISP:
    while(1)
    {
        if(bSpiDataReady == 1)
        {
            NVIC_DisableIRQ(SPI1_IRQn);
            memcpy(cmd_buff, spi_rcvbuf, 64);
            bSpiDataReady = 0;
            ParseCmd((unsigned char *)cmd_buff, 64);
            NVIC_EnableIRQ(SPI1_IRQn);
        }
    }

_APROM:
    /* Reset system and boot from APROM */
    FMC_SetVectorPageAddr(FMC_APROM_BASE);
    NVIC_SystemReset();

    /* Trap the CPU */
    while(1);
}
