/***************************************************************************//**
 * @file     main.c
 * @brief    ISP tool main function
 * @version  0x32
 * @date     14, June, 2017
 *
 * SPDX-License-Identifier: Apache-2.0
 * @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.
 ******************************************************************************/
#include <stdio.h>
#include "targetdev.h"
#include "uart_transfer.h"

#define HCLK_DIV                1

#define nRTSPin                 (PB14)
#define REVEIVE_MODE            (0)
#define TRANSMIT_MODE           (1)



__WEAK uint32_t CLK_GetPLLClockFreq(void)
{
    return FREQ_48MHZ;
}

void SYS_Init(void)
{
    /* Enable Internal and External RC clock */
    CLK->PWRCTL |= CLK_PWRCTL_HIRCEN_Msk;

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

    CLK->CLKSEL0 = (CLK->CLKSEL0 & (~CLK_CLKSEL0_HCLKSEL_Msk)) | CLK_CLKSEL0_HCLKSEL_HIRC;
    CLK->CLKDIV0 &= ~CLK_CLKDIV0_HCLKDIV_Msk;
    CLK->CLKDIV0 |= CLK_CLKDIV0_HCLK(HCLK_DIV);

    /* Update System Core Clock */
    SystemCoreClock = FREQ_48MHZ / HCLK_DIV;            // HCLK
    CyclesPerUs     = SystemCoreClock / 1000000;        // For SYS_SysTickDelay()

    /* Enable UART module clock */
    CLK->APBCLK0 |= CLK_APBCLK0_UART1CKEN_Msk;

    /* Enable GPB clock */
    CLK->AHBCLK |= CLK_AHBCLK_GPBCKEN_Msk;

    /* Select UART module clock source */
    CLK->CLKSEL1 &= ~CLK_CLKSEL1_UART1SEL_Msk;
    CLK->CLKSEL1 |= CLK_CLKSEL1_UART1SEL_HIRC;
    CLK->PCLKDIV = CLK_PCLKDIV_APB0DIV_DIV2 | CLK_PCLKDIV_APB1DIV_DIV2;

    /*---------------------------------------------------------------------------------------------------------*/
    /* Init I/O Multi-function                                                                                 */
    /*---------------------------------------------------------------------------------------------------------*/
    PB->MODE = (PB->MODE & ~(0x3ul << (14 << 1))) | (GPIO_MODE_OUTPUT << (14 << 1));
    nRTSPin = REVEIVE_MODE;
    SYS->GPA_MFPL = (SYS->GPA_MFPL & ~(SYS_GPA_MFPL_PA2MFP_Msk)) | SYS_GPA_MFPL_PA2MFP_UART1_RXD;
    SYS->GPA_MFPL = (SYS->GPA_MFPL & ~(SYS_GPA_MFPL_PA3MFP_Msk)) | SYS_GPA_MFPL_PA3MFP_UART1_TXD;
}

/*---------------------------------------------------------------------------------------------------------*/
/* MAIN function                                                                                           */
/*---------------------------------------------------------------------------------------------------------*/

int main(void)
{
    /* Unlock protected registers to operate SYS_Init and FMC ISP function */
    SYS_UnlockReg();

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

    /* Init UART to 115200-8n1 */
    UART_Init();

    CLK->AHBCLK |= CLK_AHBCLK_ISPCKEN_Msk | CLK_AHBCLK_EXSTCKEN_Msk;
    FMC->ISPCTL |= FMC_ISPCTL_ISPEN_Msk | FMC_ISPCTL_APUEN_Msk;

    g_apromSize = GetApromSize();
    GetDataFlashInfo(&g_dataFlashAddr, &g_dataFlashSize);

    SysTick->LOAD = 300000 * CyclesPerUs;
    SysTick->VAL   = (0x00);
    SysTick->CTRL = SysTick->CTRL | SysTick_CTRL_CLKSOURCE_Msk | SysTick_CTRL_ENABLE_Msk;  //using cpu clock

    while (1)
    {
        if ((bufhead >= 4) || (bUartDataReady == TRUE))
        {
            uint32_t lcmd;
            lcmd = inpw(uart_rcvbuf);

            if (lcmd == CMD_CONNECT)
            {
                goto _ISP;
            }
            else
            {
                bUartDataReady = FALSE;
                bufhead = 0;
            }
        }

        if (SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk)
        {
            goto _APROM;
        }
    }

_ISP:

    while (1)
    {
        if (bUartDataReady == TRUE)
        {
            bUartDataReady = FALSE;
            ParseCmd(uart_rcvbuf, 64);
            NVIC_DisableIRQ(UART1_IRQn);
            nRTSPin = TRANSMIT_MODE;
            PutString();

            while ((UART1->FIFOSTS & UART_FIFOSTS_TXEMPTYF_Msk) == 0);

            nRTSPin = REVEIVE_MODE;
            NVIC_EnableIRQ(UART1_IRQn);
        }
    }

_APROM:
    SYS->RSTSTS = (SYS_RSTSTS_PORF_Msk | SYS_RSTSTS_PINRF_Msk);
    // FMC_ISPCTL_BS_Msk only works with Boot from APROM/LDROM without IAP mode.
    FMC->ISPCTL &= ~(FMC_ISPCTL_ISPEN_Msk | FMC_ISPCTL_BS_Msk);
    /* Wait system reset */
    NVIC_SystemReset();
}
