/******************************************************************************
 * @file     main.c
 * @version  V1.00
 * $Revision: 2 $
 * $Date: 16/10/25 4:34p $
 * @brief    Show how to wake-up USCI_I2C from deep sleep mode.
 *           This sample code needs to work with USCI_I2C_Master.
 * @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 PLL_CLOCK       72000000

/*---------------------------------------------------------------------------------------------------------*/
/* Global variables                                                                                        */
/*---------------------------------------------------------------------------------------------------------*/
volatile uint8_t g_au8SlvData[256];
volatile uint32_t slave_buff_addr;
volatile uint8_t g_au8RxData[4];
volatile uint16_t g_u16RecvAddr;
volatile uint8_t g_u8DataLenS;
volatile uint8_t g_u8SlvPWRDNWK = 0, g_u8SlvI2CWK = 0;
volatile uint32_t g_u32WKfromAddr;

volatile enum UI2C_SLAVE_EVENT s_Event;

typedef void (*UI2C_FUNC)(uint32_t u32Status);

static volatile UI2C_FUNC s_UI2C0HandlerFn = NULL;
/*---------------------------------------------------------------------------------------------------------*/
/*  Power Wake-up IRQ Handler                                                                              */
/*---------------------------------------------------------------------------------------------------------*/
void PWRWU_IRQHandler(void)
{
    /* Check system power down mode wake-up interrupt flag */
    if(((CLK->PWRCTL) & CLK_PWRCTL_PDWKIF_Msk) != 0)
    {
        /* Clear system power down wake-up interrupt flag */
        CLK->PWRCTL |= CLK_PWRCTL_PDWKIF_Msk;
        g_u8SlvPWRDNWK = 1;
    }
}

/*---------------------------------------------------------------------------------------------------------*/
/*  USCI_I2C IRQ Handler                                                                                   */
/*---------------------------------------------------------------------------------------------------------*/
void USCI_IRQHandler(void)
{
    uint32_t u32Status;

    //UI2C0 Interrupt
    u32Status = UI2C_GET_PROT_STATUS(UI2C0);
    if(s_UI2C0HandlerFn != NULL)
        s_UI2C0HandlerFn(u32Status);
}

/*---------------------------------------------------------------------------------------------------------*/
/*  UI2C0 toggle wake-up                                                                                   */
/*---------------------------------------------------------------------------------------------------------*/
void UI2C_SLV_Toggle_Wakeup(uint32_t u32Status)
{
    if((UI2C0->WKSTS & UI2C_WKSTS_WKF_Msk) == UI2C_WKSTS_WKF_Msk)
    {
        g_u32WKfromAddr = 0;
        g_u8SlvI2CWK = 1;

        /* Clear WKF INT Flag */
        UI2C_CLR_WAKEUP_FLAG(UI2C0);
        return;
    }

    if((u32Status & UI2C_PROTSTS_STARIF_Msk) == UI2C_PROTSTS_STARIF_Msk)
    {
        /* Clear START INT Flag */
        UI2C_CLR_PROT_INT_FLAG(UI2C0, UI2C_PROTSTS_STARIF_Msk);

        /* Event process */
        g_u8DataLenS = 0;
        s_Event = SLAVE_ADDRESS_ACK;
        UI2C_SET_CONTROL_REG(UI2C0, (UI2C_CTL_PTRG | UI2C_CTL_AA));
    }
    else if((u32Status & UI2C_PROTSTS_ACKIF_Msk) == UI2C_PROTSTS_ACKIF_Msk)
    {
        /* Clear ACK INT Flag */
        UI2C_CLR_PROT_INT_FLAG(UI2C0, UI2C_PROTSTS_ACKIF_Msk);

        /* Event process */
        if(s_Event == SLAVE_ADDRESS_ACK)
        {
            g_u8DataLenS = 0;

            if((UI2C0->PROTSTS & UI2C_PROTSTS_SLAREAD_Msk) == UI2C_PROTSTS_SLAREAD_Msk)
            {
                /* Own SLA+R has been receive; ACK has been return */
                s_Event = SLAVE_SEND_DATA;
                UI2C_SET_DATA(UI2C0, g_au8SlvData[slave_buff_addr]);
                slave_buff_addr++;
            }
            else
            {
                s_Event = SLAVE_GET_DATA;
            }
            g_u16RecvAddr = (uint8_t)UI2C_GET_DATA(UI2C0);
        }
        else if(s_Event == SLAVE_GET_DATA)
        {
            g_au8RxData[g_u8DataLenS] = (uint8_t)UI2C_GET_DATA(UI2C0);
            g_u8DataLenS++;

            if(g_u8DataLenS == 2)
            {
                /* Address has been received; ACK has been returned*/
                slave_buff_addr = (g_au8RxData[0] << 8) + g_au8RxData[1];
            }
            if(g_u8DataLenS == 3)
            {
                g_au8SlvData[slave_buff_addr] = g_au8RxData[2];
                g_u8DataLenS = 0;
            }
        }

        UI2C_SET_CONTROL_REG(UI2C0, (UI2C_CTL_PTRG | UI2C_CTL_AA));
    }
    else if((u32Status & UI2C_PROTSTS_NACKIF_Msk) == UI2C_PROTSTS_NACKIF_Msk)
    {
        /* Clear NACK INT Flag */
        UI2C_CLR_PROT_INT_FLAG(UI2C0, UI2C_PROTSTS_NACKIF_Msk);

        /* Event process */
        g_u8DataLenS = 0;
        s_Event = SLAVE_ADDRESS_ACK;

        UI2C_SET_CONTROL_REG(UI2C0, (UI2C_CTL_PTRG | UI2C_CTL_AA));
    }
    else if((u32Status & UI2C_PROTSTS_STORIF_Msk) == UI2C_PROTSTS_STORIF_Msk)
    {
        /* Clear STOP INT Flag */
        UI2C_CLR_PROT_INT_FLAG(UI2C0, UI2C_PROTSTS_STORIF_Msk);

        g_u8DataLenS = 0;
        s_Event = SLAVE_ADDRESS_ACK;

        UI2C_SET_CONTROL_REG(UI2C0, (UI2C_CTL_PTRG | UI2C_CTL_AA));
    }
}

/*---------------------------------------------------------------------------------------------------------*/
/*  UI2C0 address match wake-up                                                                            */
/*---------------------------------------------------------------------------------------------------------*/
void UI2C_SLV_Address_Wakeup(uint32_t u32Status)
{
    if((UI2C0->WKSTS & UI2C_WKSTS_WKF_Msk) == UI2C_WKSTS_WKF_Msk)
    {
        g_u32WKfromAddr = 1;
        g_u8SlvI2CWK = 1;

        /* */
        while((UI2C0->PROTSTS & UI2C_PROTSTS_WKAKDONE_Msk) == 0) {};

        /* Clear WK flag */
        UI2C_CLR_WAKEUP_FLAG(UI2C0);
        UI2C0->PROTSTS = UI2C_PROTSTS_WKAKDONE_Msk;

        return;
    }

    if((u32Status & UI2C_PROTSTS_STARIF_Msk) == UI2C_PROTSTS_STARIF_Msk)
    {
        /* Clear START INT Flag */
        UI2C_CLR_PROT_INT_FLAG(UI2C0, UI2C_PROTSTS_STARIF_Msk);

        /* Event process */
        g_u8DataLenS = 0;
        s_Event = SLAVE_ADDRESS_ACK;

        UI2C_SET_CONTROL_REG(UI2C0, (UI2C_CTL_PTRG | UI2C_CTL_AA));
    }
    else if((u32Status & UI2C_PROTSTS_ACKIF_Msk) == UI2C_PROTSTS_ACKIF_Msk)
    {
        /* Clear ACK INT Flag */
        UI2C_CLR_PROT_INT_FLAG(UI2C0, UI2C_PROTSTS_ACKIF_Msk);

        /* Event process */
        if(s_Event == SLAVE_ADDRESS_ACK)
        {
            g_u8DataLenS = 0;

            if((UI2C0->PROTSTS & UI2C_PROTSTS_SLAREAD_Msk) == UI2C_PROTSTS_SLAREAD_Msk)
            {
                /* Own SLA+R has been receive; ACK has been return */
                s_Event = SLAVE_SEND_DATA;
                UI2C_SET_DATA(UI2C0, g_au8SlvData[slave_buff_addr]);
                slave_buff_addr++;
            }
            else
            {
                s_Event = SLAVE_GET_DATA;
            }
            g_u16RecvAddr = (uint8_t)UI2C_GET_DATA(UI2C0);
        }
        else if(s_Event == SLAVE_GET_DATA)
        {
            g_au8RxData[g_u8DataLenS] = (uint8_t)UI2C_GET_DATA(UI2C0);
            g_u8DataLenS++;

            if(g_u8DataLenS == 2)
            {
                /* Address has been received; ACK has been returned*/
                slave_buff_addr = (g_au8RxData[0] << 8) + g_au8RxData[1];
            }
            if(g_u8DataLenS == 3)
            {
                g_au8SlvData[slave_buff_addr] = g_au8RxData[2];
                g_u8DataLenS = 0;
            }
        }

        UI2C_SET_CONTROL_REG(UI2C0, (UI2C_CTL_PTRG | UI2C_CTL_AA));
    }
    else if((u32Status & UI2C_PROTSTS_NACKIF_Msk) == UI2C_PROTSTS_NACKIF_Msk)
    {
        /* Clear NACK INT Flag */
        UI2C_CLR_PROT_INT_FLAG(UI2C0, UI2C_PROTSTS_NACKIF_Msk);

        /* Event process */
        g_u8DataLenS = 0;
        s_Event = SLAVE_ADDRESS_ACK;

        UI2C_SET_CONTROL_REG(UI2C0, (UI2C_CTL_PTRG | UI2C_CTL_AA));
    }
    else if((u32Status & UI2C_PROTSTS_STORIF_Msk) == UI2C_PROTSTS_STORIF_Msk)
    {
        /* Clear STOP INT Flag */
        UI2C_CLR_PROT_INT_FLAG(UI2C0, UI2C_PROTSTS_STORIF_Msk);

        g_u8DataLenS = 0;
        s_Event = SLAVE_ADDRESS_ACK;

        UI2C_SET_CONTROL_REG(UI2C0, (UI2C_CTL_PTRG | UI2C_CTL_AA));
    }
}

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

    /* Enable Internal RC 22.1184MHz clock */
    CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk);

    /* Waiting for Internal RC clock ready */
    CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);

    /* Switch HCLK clock source to Internal RC and HCLK source divide 1 */
    CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HXT, CLK_CLKDIV0_HCLK(1));

    /* Enable external XTAL 12MHz clock */
    CLK_EnableXtalRC(CLK_PWRCTL_HXTEN_Msk);

    /* Waiting for external XTAL clock ready */
    CLK_WaitClockReady(CLK_STATUS_HXTSTB_Msk);

    /* Set core clock as PLL_CLOCK from PLL */
    //CLK_SetCoreClock(PLL_CLOCK);

    /* Enable UART module clock */
    CLK_EnableModuleClock(UART0_MODULE);

    /* Enable IP clock */
    CLK_EnableModuleClock(USCI0_MODULE);

    /* Select UART module clock source */
    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UARTSEL_HXT, CLK_CLKDIV0_UART(1));

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

    /*---------------------------------------------------------------------------------------------------------*/
    /* 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;

    /* Set PC multi-function pins for UI2C0_SDA(PC.5) and UI2C0_SDA(PC.4) */
    SYS->GPC_MFPL &= ~(SYS_GPC_MFPL_PC5MFP_Msk | SYS_GPC_MFPL_PC4MFP_Msk);
    SYS->GPC_MFPL |= (SYS_GPC_MFPL_PC5MFP_USCI0_DAT0 | SYS_GPC_MFPL_PC4MFP_USCI0_CLK);

    /* I2C pins enable schmitt trigger */
    PC->SMTEN |= (GPIO_SMTEN_SMTEN4_Msk | GPIO_SMTEN_SMTEN5_Msk);
}

void UI2C0_Init(uint32_t u32ClkSpeed)
{
    /* Open UI2C0 and set clock to 100k */
    UI2C_Open(UI2C0, u32ClkSpeed);

    /* Get UI2C0 Bus Clock */
    printf("UI2C0 clock %d Hz\n", UI2C_GetBusClockFreq(UI2C0));

    /* Set UI2C0 Slave Addresses */
    UI2C_SetSlaveAddr(UI2C0, 0, 0x16, UI2C_GCMODE_DISABLE);   /* Slave Address : 0x16 */
    UI2C_SetSlaveAddr(UI2C0, 1, 0x36, UI2C_GCMODE_DISABLE);   /* Slave Address : 0x36 */

    /* Set UI2C0 Slave Addresses Mask */
    UI2C_SetSlaveAddrMask(UI2C0, 0, 0x04);                    /* Slave Address : 0x4 */
    UI2C_SetSlaveAddrMask(UI2C0, 1, 0x02);                    /* Slave Address : 0x2 */

    UI2C_ENABLE_PROT_INT(UI2C0, (UI2C_PROTIEN_ACKIEN_Msk | UI2C_PROTIEN_NACKIEN_Msk | UI2C_PROTIEN_STORIEN_Msk | UI2C_PROTIEN_STARIEN_Msk));
    NVIC_EnableIRQ(USCI_IRQn);

}

int main()
{
    uint32_t i, u32TimeOutCnt;
    uint8_t  ch;

    /* Unlock protected registers */
    SYS_UnlockReg();

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

    /* Init UART for print message */
    UART_Open(UART0, 115200);

    printf("\n");
    printf("+---------------------------------------------------------------------+\n");
    printf("| USCI_I2C Driver Sample Code (Slave) for wake-up & access Slave test |\n");
    printf("| Needs to work with USCI_I2C_Master sample code.                     |\n");
    printf("|      UI2C Master (I2C0) <---> UI2C Slave (I2C0)                     |\n");
    printf("| !! This sample code requires two boards for testing !!              |\n");
    printf("+---------------------------------------------------------------------+\n");

    printf("\n");
    printf("Configure UI2C0 as a Slave\n");
    printf("The I/O connection for UI2C0:\n");
    printf("UI2C0_SDA(PC.5), UI2C0_SCL(PC.4)\n");

    /* Init UI2C0 100KHz */
    UI2C0_Init(100000);

    printf("[T] I/O Toggle Wake-up Mode\n");
    printf("[A] Address Match Wake-up Mode\n");
    printf("Select: ");
    ch =  getchar();

    if((ch == 'T') || (ch == 't'))
    {
        printf("(T)oggle\n");

        /* Enable UI2C0 toggle mode wake-up */
        UI2C_EnableWakeup(UI2C0, UI2C_DATA_TOGGLE_WK);
        s_Event = SLAVE_ADDRESS_ACK;

        /* I2C function to Slave receive/transmit data */
        s_UI2C0HandlerFn = UI2C_SLV_Toggle_Wakeup;
    }
    else
    {
        /* Default Mode*/
        printf("(A)ddress math\n");

        /* Enable UI2C0 address match mode wake-up */
        UI2C_EnableWakeup(UI2C0, UI2C_ADDR_MATCH_WK);

        s_Event = SLAVE_GET_DATA;

        /* UI2C0 function to Slave receive/transmit data */
        s_UI2C0HandlerFn = UI2C_SLV_Address_Wakeup;
    }

    UI2C_SET_CONTROL_REG(UI2C0, (UI2C_CTL_PTRG | UI2C_CTL_AA));

    for(i = 0; i < 0x100; i++)
    {
        g_au8SlvData[i] = 0;
    }

    /* Enable power wake-up interrupt */
    CLK->PWRCTL |= CLK_PWRCTL_PDWKIEN_Msk;
    NVIC_EnableIRQ(PWRWU_IRQn);

    /* System power down enable */
    printf("\nEnter PD 0x%x 0x%x\n", UI2C0->PROTCTL, UI2C_GET_PROT_STATUS(UI2C0));
    printf("\nCHIP enter power down status.\n");

    /* Waiting for UART printf finish */
    u32TimeOutCnt = SystemCoreClock; /* 1 second time-out */
    while((UART0->FIFOSTS & UART_FIFOSTS_TXEMPTYF_Msk) == 0)
        if(--u32TimeOutCnt == 0) break;

    /* Clear flage before enter power-down mode */
    if(UI2C0->PROTSTS != 0)
        UI2C0->PROTSTS = UI2C0->PROTSTS;

    CLK_PowerDown();

    u32TimeOutCnt = SystemCoreClock; /* 1 second time-out */
    while( (g_u8SlvPWRDNWK==0) || (g_u8SlvI2CWK==0) )
    {
        if(--u32TimeOutCnt == 0)
        {
            printf("Wait for system or USCI_I2C interrupt time-out!\n");
            break;
        }
    }

    if(g_u32WKfromAddr)
        printf("UI2C0 [A]ddress match Wake-up from Deep Sleep\n");
    else
        printf("UI2C0 [T]oggle Wake-up from Deep Sleep\n");
    while(1);
}

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