/**************************************************************************//**
 * @file     main.c
 * @version  V3.00
 * $Revision: 5 $
 * $Date: 15/07/08 9:57a $
 * @brief
 *           Show a I2C Master how to access Slave.
 *           This sample code needs to work with I2C_Slave.
 * @note
 * Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
 *
 ******************************************************************************/
#include <stdio.h>
#include "M0519.h"

#define PLLCON_SETTING  CLK_PLLCON_72MHz_HXT
#define PLL_CLOCK       72000000


/*---------------------------------------------------------------------------------------------------------*/
/* Global variables                                                                                        */
/*---------------------------------------------------------------------------------------------------------*/
volatile uint8_t g_u8DeviceAddr;
volatile uint8_t g_au8MstTxData[3];
volatile uint8_t g_u8MstRxData;
volatile uint8_t g_u8MstDataLen;
volatile uint8_t g_u8MstEndFlag = 0;

typedef void (*I2C_FUNC)(uint32_t u32Status);

static volatile I2C_FUNC s_I2CMstHandlerFn = NULL;

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

    u32Status = I2C0->I2CSTATUS;

    if(I2C0->I2CTOC & I2C_I2CTOC_TIF_Msk)
    {
        /* Clear I2C Timeout Flag */
        I2C0->I2CTOC |= I2C_I2CTOC_TIF_Msk;
    }
    else
    {
        if(s_I2CMstHandlerFn != NULL)
            s_I2CMstHandlerFn(u32Status);
    }
}

/*---------------------------------------------------------------------------------------------------------*/
/*  I2C0 Rx Callback Function                                                                               */
/*---------------------------------------------------------------------------------------------------------*/
void I2C_MasterRx(uint32_t u32Status)
{
    if(u32Status == 0x08)                       /* START has been transmitted and prepare SLA+W */
    {
        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 != 2)
        {
            I2C0->I2CDAT = g_au8MstTxData[g_u8MstDataLen++];
            I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI);
        }
        else
        {
            I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_STA_SI);
        }
    }
    else if(u32Status == 0x10)                  /* Repeat START has been transmitted and prepare SLA+R */
    {
        I2C0->I2CDAT = ((g_u8DeviceAddr << 1) | 0x01);   /* Write SLA+R to Register I2CDAT */
        I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI);
    }
    else if(u32Status == 0x40)                  /* SLA+R has been transmitted and ACK has been received */
    {
        I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI);
    }
    else if(u32Status == 0x58)                  /* DATA has been received and NACK has been returned */
    {
        g_u8MstRxData = I2C0->I2CDAT;
        I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_STO_SI);
        g_u8MstEndFlag = 1;
    }
    else
    {
        /* TO DO */
        printf("Status 0x%x is NOT processed\n", u32Status);
    }
}

/*---------------------------------------------------------------------------------------------------------*/
/*  I2C0 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)
{
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init System Clock                                                                                       */
    /*---------------------------------------------------------------------------------------------------------*/

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

    /* Waiting for Internal RC clock ready */
    while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_OSC22M_STB_Msk));

    /* Switch HCLK clock source to Internal RC and and HCLK source divide 1 */
    CLK->CLKSEL0 &= ~CLK_CLKSEL0_HCLK_S_Msk;
    CLK->CLKSEL0 |= CLK_CLKSEL0_HCLK_S_HIRC;
    CLK->CLKDIV &= ~CLK_CLKDIV_HCLK_N_Msk;
    CLK->CLKDIV |= CLK_CLKDIV_HCLK(1);

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

    /* Waiting for external XTAL clock ready */
    while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_XTL12M_STB_Msk));

    /* Set core clock as PLL_CLOCK from PLL */
    CLK->PLLCON = PLLCON_SETTING;
    while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_PLL_STB_Msk));
    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 CycylesPerUs automatically. */
    //SystemCoreClockUpdate();
    PllClock        = PLL_CLOCK;            // PLL
    SystemCoreClock = PLL_CLOCK / 1;        // HCLK
    CyclesPerUs     = PLL_CLOCK / 1000000;  // For SYS_SysTickDelay()

    /* Enable UART0 & I2C0 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 GP3 multi-function pins for UART0 RXD and TXD */
    SYS->P3_MFP &= ~(SYS_MFP_P30_Msk | SYS_MFP_P31_Msk);
		SYS->P3_MFP |= (SYS_MFP_P30_UART0_RXD | SYS_MFP_P31_UART0_TXD);

    /* Set GP3 multi-function pins for I2C0 SDA and SCL */
    SYS->P3_MFP |= (SYS_MFP_P34_I2C0_SDA | SYS_MFP_P35_I2C0_SCL);

}

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)
{
    uint32_t u32BusClock;

    /* 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 bus clock 100K divider setting, I2CLK = PCLK/(100K*4)-1 */
    u32BusClock = 100000;
    I2C0->I2CLK = (uint32_t)(((SystemCoreClock * 10) / (u32BusClock * 4) + 5) / 10 - 1); /* Compute proper divider for I2C clock */

    /* Get I2C0 Bus Clock */
    printf("I2C0 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_Uninit(void)
{
    /* Disable I2C0 interrupt and clear corresponding NVIC bit */
    I2C0->I2CON &= ~I2C_I2CON_EI_Msk;
    NVIC_DisableIRQ(I2C0_IRQn);

    /* Disable I2C0 and close I2C clock */
    I2C0->I2CON &= ~I2C_I2CON_ENS1_Msk;
    CLK->APBCLK &= ~CLK_APBCLK_I2C0_EN_Msk;

}

int32_t Read_Write_SLAVE(uint8_t slvaddr)
{
    uint32_t i;

    g_u8DeviceAddr = slvaddr;

    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;

        /* I2C0 function to write data to slave */
        s_I2CMstHandlerFn = (I2C_FUNC)I2C_MasterTx;

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

        /* Wait I2C0 Tx Finish */
        while(g_u8MstEndFlag == 0);
        g_u8MstEndFlag = 0;

        /* I2C0 function to read data from slave */
        s_I2CMstHandlerFn = (I2C_FUNC)I2C_MasterRx;

        g_u8MstDataLen = 0;
        g_u8DeviceAddr = slvaddr;

        I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_STA);

        /* Wait I2C0 Rx Finish */
        while(g_u8MstEndFlag == 0);

        /* Compare data */
        if(g_u8MstRxData != g_au8MstTxData[2])
        {
            printf("I2C0 Byte Write/Read Failed, Data 0x%x\n", g_u8MstRxData);
            return -1;
        }
    }
    printf("Master Access Slave (0x%X) Test OK\n", slvaddr);
    return 0;
}
/*---------------------------------------------------------------------------------------------------------*/
/*  Main Function                                                                                          */
/*---------------------------------------------------------------------------------------------------------*/
int32_t main(void)
{
    /* 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 I2C0 bus clock to 100kHz. Then, Master accesses Slave with Byte Write
        and Byte Read operations, and check if the read data is equal to the programmed data.
    */
    printf("\n");
    printf("+--------------------------------------------------------+\n");
    printf("| M0519 I2C Driver Sample Code(Master) for access Slave  |\n");
    printf("|                                                        |\n");
    printf("| I2C Master (I2C0) <---> I2C Slave(I2C0)                  |\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 */
    I2C0_Init();

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

    /* Access Slave with no address mask */
    printf("\n");
    printf(" == No Mask Address ==\n");
    Read_Write_SLAVE(0x15);
    Read_Write_SLAVE(0x35);
    Read_Write_SLAVE(0x55);
    Read_Write_SLAVE(0x75);
    printf("SLAVE Address test OK.\n");

    /* Access Slave with address mask */
    printf("\n");
    printf(" == Mask Address ==\n");
    Read_Write_SLAVE(0x15 & ~0x01);
    Read_Write_SLAVE(0x35 & ~0x04);
    Read_Write_SLAVE(0x55 & ~0x01);
    Read_Write_SLAVE(0x75 & ~0x04);
    printf("SLAVE Address Mask test OK.\n");

    s_I2CMstHandlerFn = NULL;

    /* Close I2C0 */
    I2C0_Uninit();

    while(1);
}



