/**************************************************************************//**
 * @file     main.c
 * @version  V3.00
 * $Revision: 2 $
 * $Date: 15/02/06 10:22a $
 * @brief
 *           Show how a Master uses I2C address 0x0 to write data to Slave.
 *           This sample code needs to work with I2C_GCMode_Slave.
 * @note
 * @copyright SPDX-License-Identifier: Apache-2.0
 *
 * @copyright Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
 ******************************************************************************/
#include <stdio.h>
#include "M058S.h"

#define PLLCON_SETTING  CLK_PLLCON_50MHz_HXT
#define PLL_CLOCK       50000000

/*---------------------------------------------------------------------------------------------------------*/
/* Global variables                                                                                        */
/*---------------------------------------------------------------------------------------------------------*/
volatile uint8_t g_u8DeviceAddr;
volatile uint8_t g_au8MstTxData[3];
volatile uint8_t g_u8MstDataLen;
volatile uint8_t g_u8MstEndFlag = 0;

typedef void (*I2C_FUNC)(uint32_t u32Status);

static volatile I2C_FUNC s_I2C0HandlerFn = NULL;
extern char GetChar(void);

/*---------------------------------------------------------------------------------------------------------*/
/*  I2C0 IRQ Handler                                                                                       */
/*---------------------------------------------------------------------------------------------------------*/
void I2C0_IRQHandler(void)
{
    uint32_t u32Status;

    u32Status = I2C0->I2CSTATUS;
    if(I2C0->I2CTOC & I2C_I2CTOC_TIF_Msk)
    {
        /* Clear I2C0 Timeout Flag */
        I2C0->I2CTOC |= I2C_I2CTOC_TIF_Msk;
    }
    else
    {
        if(s_I2C0HandlerFn != NULL)
            s_I2C0HandlerFn(u32Status);
    }
}

/*---------------------------------------------------------------------------------------------------------*/
/*  I2C Tx Callback Function                                                                               */
/*---------------------------------------------------------------------------------------------------------*/
void I2C_MasterTx(uint32_t u32Status)
{
    if(u32Status == 0x08)                       /* START has been transmitted */
    {
        I2C0->I2CDAT = g_u8DeviceAddr << 1;     /* Write SLA+W to Register I2CDAT */
        I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI);
    }
    else if(u32Status == 0x18)                  /* SLA+W has been transmitted and ACK has been received */
    {
        I2C0->I2CDAT = g_au8MstTxData[g_u8MstDataLen++];
        I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI);
    }
    else if(u32Status == 0x20)                  /* SLA+W has been transmitted and NACK has been received */
    {
        I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_STA_STO_SI);
    }
    else if(u32Status == 0x28)                  /* DATA has been transmitted and ACK has been received */
    {
        if(g_u8MstDataLen != 3)
        {
            I2C0->I2CDAT = g_au8MstTxData[g_u8MstDataLen++];
            I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI);
        }
        else
        {
            I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_STO_SI);
            g_u8MstEndFlag = 1;
        }
    }
    else
    {
        /* TO DO */
        printf("Status 0x%x is NOT processed\n", u32Status);
    }
}

void SYS_Init(void)
{
	uint32_t u32TimeOutCnt;
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init System Clock                                                                                       */
    /*---------------------------------------------------------------------------------------------------------*/

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

    /* Waiting for Internal RC clock ready */
    u32TimeOutCnt = __HIRC;
	while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_OSC22M_STB_Msk))
		if(--u32TimeOutCnt == 0) break;

    /* Switch HCLK clock source to Internal RC */
    CLK->CLKSEL0 &= ~CLK_CLKSEL0_HCLK_S_Msk;
    CLK->CLKSEL0 |= CLK_CLKSEL0_HCLK_S_HIRC;

    /* Enable external XTAL 12MHz clock */
    CLK->PWRCON |= CLK_PWRCON_XTL12M_EN_Msk;

    /* Waiting for external XTAL clock ready */
    u32TimeOutCnt = __HIRC;
	while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_XTL12M_STB_Msk))
		if(--u32TimeOutCnt == 0) break;

    /* Set core clock as PLL_CLOCK from PLL */
    CLK->PLLCON = PLLCON_SETTING;
    u32TimeOutCnt = __HIRC;
	while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_PLL_STB_Msk))
		if(--u32TimeOutCnt == 0) break;
    CLK->CLKSEL0 &= (~CLK_CLKSEL0_HCLK_S_Msk);
    CLK->CLKSEL0 |= CLK_CLKSEL0_HCLK_S_PLL;

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

    /* Enable UART and I2C module clock */
    CLK->APBCLK |= CLK_APBCLK_UART0_EN_Msk | CLK_APBCLK_I2C0_EN_Msk;

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

    /*---------------------------------------------------------------------------------------------------------*/
    /* Init I/O Multi-function                                                                                 */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Set P3 multi-function pins for UART0 RXD and TXD, and set P3.4 and P3.5 for I2C0 SDA and SCL */
    SYS->P3_MFP &= ~(SYS_MFP_P30_Msk | SYS_MFP_P31_Msk | SYS_MFP_P34_Msk | SYS_MFP_P35_Msk);
    SYS->P3_MFP |= SYS_MFP_P30_RXD | SYS_MFP_P31_TXD | SYS_MFP_P34_SDA0 | SYS_MFP_P35_SCL0;

}

void UART0_Init(void)
{
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init UART                                                                                               */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Reset UART IP */
    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;
}

void I2C0_Init(void)
{
    /* Reset I2C0 */
    SYS->IPRSTC2 |=  SYS_IPRSTC2_I2C0_RST_Msk;
    SYS->IPRSTC2 &= ~SYS_IPRSTC2_I2C0_RST_Msk;

    /* Enable I2C0 Controller */
    I2C0->I2CON |= I2C_I2CON_ENS1_Msk;

    /* I2C0 clock divider, I2C Bus Clock = PCLK / (4*125) = 100kHz */
    I2C0->I2CLK = 125 - 1;

    /* Get I2C0 Bus Clock */
    printf("I2C clock %d Hz\n", (SystemCoreClock / (((I2C0->I2CLK) + 1) << 2)));

    /* Set I2C0 4 Slave Addresses */
    /* Slave Address : 0x15 */
    I2C0->I2CADDR0 = (I2C0->I2CADDR0 & ~I2C_I2CADDR_I2CADDR_Msk) | (0x15 << I2C_I2CADDR_I2CADDR_Pos);
    /* Slave Address : 0x35 */
    I2C0->I2CADDR1 = (I2C0->I2CADDR1 & ~I2C_I2CADDR_I2CADDR_Msk) | (0x35 << I2C_I2CADDR_I2CADDR_Pos);
    /* Slave Address : 0x55 */
    I2C0->I2CADDR2 = (I2C0->I2CADDR2 & ~I2C_I2CADDR_I2CADDR_Msk) | (0x55 << I2C_I2CADDR_I2CADDR_Pos);
    /* Slave Address : 0x75 */
    I2C0->I2CADDR3 = (I2C0->I2CADDR3 & ~I2C_I2CADDR_I2CADDR_Msk) | (0x75 << I2C_I2CADDR_I2CADDR_Pos);

    /* Enable I2C0 interrupt and set corresponding NVIC bit */
    I2C0->I2CON |= I2C_I2CON_EI_Msk;
    NVIC_EnableIRQ(I2C0_IRQn);
}

void I2C0_Close(void)
{
    /* Disable I2C0 interrupt and clear corresponding NVIC bit */
    I2C0->I2CON &= ~I2C_I2CON_EI_Msk;
    NVIC_DisableIRQ(I2C0_IRQn);

    /* Disable I2C0 and close I2C0 clock */
    I2C0->I2CON &= ~I2C_I2CON_ENS1_Msk;
    CLK->APBCLK &= ~CLK_APBCLK_I2C0_EN_Msk;
}

/*---------------------------------------------------------------------------------------------------------*/
/*  Main Function                                                                                          */
/*---------------------------------------------------------------------------------------------------------*/
int32_t main(void)
{
    uint32_t i, u32TimeOutCnt;

    /* Unlock protected registers */
    SYS_UnlockReg();

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

    /* Lock protected registers */
    SYS_LockReg();

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

    /*
        This sample code sets I2C bus clock to 100kHz. Then, accesses Slave (GC Mode) with Byte Write
        and Byte Read operations, and check if the read data is equal to the programmed data.
    */
    printf("\n");
    printf("+-----------------------------------------------------------------+\n");
    printf("| I2C Driver Sample Code (Master) for access Slave (GC Mode)      |\n");
    printf("|                                                                 |\n");
    printf("| I2C Master (I2C0) <---> I2C Slave(I2C0)(Address: 0x00)          |\n");
    printf("+-----------------------------------------------------------------+\n");

    printf("Configure I2C0 as a master.\n");
    printf("The I/O connection for I2C0:\n");
    printf("I2C0_SDA(P3.4), I2C0_SCL(P3.5)\n");

    /* Init I2C0 to access EEPROM */
    I2C0_Init();

    printf("\n");

    /* Send Slave GC Mode address */
    g_u8DeviceAddr = 0x00;

    printf("Check I2C Slave(I2C0) is running first!\n");
    printf("Press any key to continue.\n");
    GetChar();

    for(i = 0; i < 0x100; i++)
    {
        g_au8MstTxData[0] = (uint8_t)((i & 0xFF00) >> 8);
        g_au8MstTxData[1] = (uint8_t)(i & 0x00FF);
        g_au8MstTxData[2] = (uint8_t)(g_au8MstTxData[1] + 3);

        g_u8MstDataLen = 0;
        g_u8MstEndFlag = 0;

        /* I2C function to write data to slave */
        s_I2C0HandlerFn = (I2C_FUNC)I2C_MasterTx;

        /* I2C as master sends START signal */
        I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_STA);

        /* Wait I2C Tx Finish */
        u32TimeOutCnt = I2C_TIMEOUT;
        while(g_u8MstEndFlag == 0)
        {
            if(--u32TimeOutCnt == 0)
            {
                printf("Wait for I2C Tx finish time-out!\n");
                goto lexit;
            }
        }
    }
    printf("Master Access Slave(0x%X) at GC Mode Test OK\n", g_u8DeviceAddr);

lexit:

    s_I2C0HandlerFn = NULL;

    /* Close I2C0 */
    I2C0_Close();

    while(1);
}
