[DemoCode下载] I2C从机都可以唤醒系统

/**************************************************************************//**

 * [url=home.php?mod=space&uid=288409]@file[/url]     main.c

 * [url=home.php?mod=space&uid=895143]@version[/url]  V3.00

 * $Revision: 16 $

 * $Date: 16/06/21 7:44p $

 * @brief

 *           Demonstrate how to set I2C to wake-up MCU from power-down mode.

 *           Needs to work with I2C_Wakeup_Master sample code.

 * @note

 * Copyright (C) 2014~2015 Nuvoton Technology Corp. All rights reserved.

 *

 ******************************************************************************/

#include <stdio.h>

#include "NUC123.h"



#define PLLCON_SETTING      CLK_PLLCON_72MHz_HXT

#define PLL_CLOCK           72000000



/*---------------------------------------------------------------------------------------------------------*/

/* Global variables                                                                                        */

/*---------------------------------------------------------------------------------------------------------*/

volatile uint32_t slave_buff_addr;

volatile uint8_t g_au8SlvData[256];

volatile uint8_t g_au8SlvRxData[3];

volatile uint8_t g_u8SlvPWRDNWK, g_u8SlvI2CWK;

volatile uint8_t g_u8DeviceAddr;

volatile uint8_t g_u8SlvDataLen;



typedef void (*I2C_FUNC)(uint32_t u32Status);



static I2C_FUNC s_I2C0HandlerFn = NULL;



/*---------------------------------------------------------------------------------------------------------*/

/*  I2C0 IRQ Handler                                                                                       */

/*---------------------------------------------------------------------------------------------------------*/

void I2C0_IRQHandler(void)

{

    uint32_t u32Status;



    /* Check I2C Wake-up interrupt flag set or not */

    if(I2C_GET_WAKEUP_FLAG(I2C0))

    {

        /* Clear I2C Wake-up interrupt flag */

        I2C_CLEAR_WAKEUP_FLAG(I2C0);

                        

        g_u8SlvI2CWK = 1;                

                        

        return;

    }



    u32Status = I2C_GET_STATUS(I2C0);



    if(I2C_GET_TIMEOUT_FLAG(I2C0))

    {

        /* Clear I2C0 Timeout Flag */

        I2C_ClearTimeoutFlag(I2C0);

    }

    else

    {

        if(s_I2C0HandlerFn != NULL)

            s_I2C0HandlerFn(u32Status);

    }

}



/*---------------------------------------------------------------------------------------------------------*/

/*  Power Wake-up IRQ Handler                                                                              */

/*---------------------------------------------------------------------------------------------------------*/

void PWRWU_IRQHandler(void)

{

    /* Check system power down mode wake-up interrupt flag */

    if(((CLK->PWRCON) & CLK_PWRCON_PD_WU_STS_Msk) != 0)

    {

        /* Clear system power down wake-up interrupt flag */

        CLK->PWRCON |= CLK_PWRCON_PD_WU_STS_Msk;



        g_u8SlvPWRDNWK = 1;

    }

}



/*---------------------------------------------------------------------------------------------------------*/

/*  I2C Slave Transmit/Receive Callback Function                                                           */

/*---------------------------------------------------------------------------------------------------------*/

void I2C_SlaveTRx(uint32_t u32Status)

{

    if(u32Status == 0x60)                       /* Own SLA+W has been receive; ACK has been return */

    {

        g_u8SlvDataLen = 0;

        I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI_AA);

    }

    else if(u32Status == 0x80)                 /* Previously address with own SLA address

                                                   Data has been received; ACK has been returned*/

    {

        g_au8SlvRxData[g_u8SlvDataLen] = (unsigned char)I2C_GET_DATA(I2C0);

        g_u8SlvDataLen++;



        if(g_u8SlvDataLen == 2)

        {

            slave_buff_addr = (g_au8SlvRxData[0] << 8) + g_au8SlvRxData[1];

        }

        if(g_u8SlvDataLen == 3)

        {

            g_au8SlvData[slave_buff_addr] = g_au8SlvRxData[2];

            g_u8SlvDataLen = 0;

        }

        I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI_AA);

    }

    else if(u32Status == 0xA8)                  /* Own SLA+R has been receive; ACK has been return */

    {

        I2C_SET_DATA(I2C0, g_au8SlvData[slave_buff_addr]);

        slave_buff_addr++;

        I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI_AA);

    }

    else if(u32Status == 0xC0)                 /* Data byte or last data in I2CDAT has been transmitted

                                                   Not ACK has been received */

    {

        I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI_AA);

    }

    else if(u32Status == 0x88)                 /* Previously addressed with own SLA address; NOT ACK has

                                                   been returned */

    {

        g_u8SlvDataLen = 0;

        I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI_AA);

    }

    else if(u32Status == 0xA0)                 /* A STOP or repeated START has been received while still

                                                   addressed as Slave/Receiver*/

    {

        g_u8SlvDataLen = 0;

        I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI_AA);

    }

    else

    {

        /* TO DO */

        printf("Status 0x%x is NOT processed\n", u32Status);

    }

}



/*---------------------------------------------------------------------------------------------------------*/

/*  System initial function                                                                                */

/*---------------------------------------------------------------------------------------------------------*/

void SYS_Init(void)

{

    /*---------------------------------------------------------------------------------------------------------*/

    /* Init System Clock                                                                                       */

    /*---------------------------------------------------------------------------------------------------------*/



    /* Enable XT1_OUT (PF0) and XT1_IN (PF1) */

    SYS->GPF_MFP |= SYS_GPF_MFP_PF0_XT1_OUT | SYS_GPF_MFP_PF1_XT1_IN;



    /* Enable Internal RC 22.1184MHz clock */

    CLK_EnableXtalRC(CLK_PWRCON_OSC22M_EN_Msk);



    /* Waiting for Internal RC clock ready */

    CLK_WaitClockReady(CLK_CLKSTATUS_OSC22M_STB_Msk);



    /* Switch HCLK clock source to Internal RC and HCLK source divide 1 */

    CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HIRC, CLK_CLKDIV_HCLK(1));



    /* Enable external XTAL 12MHz clock */

    CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk);



    /* Waiting for external XTAL clock ready */

    CLK_WaitClockReady(CLK_CLKSTATUS_XTL12M_STB_Msk);



    /* Set core clock as PLL_CLOCK from PLL */

    CLK_SetCoreClock(PLL_CLOCK);



    /* Enable UART module clock */

    CLK_EnableModuleClock(UART0_MODULE);



    /* Enable I2C0 module clock */

    CLK_EnableModuleClock(I2C0_MODULE);



    /* Select UART module clock source */

    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_CLKDIV_UART(1));



    /*---------------------------------------------------------------------------------------------------------*/

    /* Init I/O Multi-function                                                                                 */

    /*---------------------------------------------------------------------------------------------------------*/



    /* Set GPB multi-function pins for UART0 RXD and TXD */

    SYS->GPB_MFP = SYS_GPB_MFP_PB0_UART0_RXD | SYS_GPB_MFP_PB1_UART0_TXD;



    /* Set GPF multi-function pins for I2C0 SDA and SCL */

    SYS->GPF_MFP |= (SYS_GPF_MFP_PF2_I2C0_SDA | SYS_GPF_MFP_PF3_I2C0_SCL);

    SYS->ALT_MFP1 &= ~(SYS_ALT_MFP1_PF2_Msk | SYS_ALT_MFP1_PF3_Msk);

    SYS->ALT_MFP1 |= (SYS_ALT_MFP1_PF2_I2C0_SDA | SYS_ALT_MFP1_PF3_I2C0_SCL);

}



void UART0_Init()

{

    /*---------------------------------------------------------------------------------------------------------*/

    /* Init UART                                                                                               */

    /*---------------------------------------------------------------------------------------------------------*/

    /* Reset IP */

    SYS_ResetModule(UART0_RST);



    /* Configure UART0 and set UART0 Baudrate */

    UART_Open(UART0, 115200);

}



void I2C0_Init(void)

{

    /* Open I2C module and set bus clock */

    I2C_Open(I2C0, 100000);



    /* Get I2C0 Bus Clock */

    printf("I2C0 clock %d Hz\n", I2C_GetBusClockFreq(I2C0));



    /* Set I2C 4 Slave Addresses */

    I2C_SetSlaveAddr(I2C0, 0, 0x15, 0);   /* Slave Address : 0x15 */

    I2C_SetSlaveAddr(I2C0, 1, 0x35, 0);   /* Slave Address : 0x35 */

    I2C_SetSlaveAddr(I2C0, 2, 0x55, 0);   /* Slave Address : 0x55 */

    I2C_SetSlaveAddr(I2C0, 3, 0x75, 0);   /* Slave Address : 0x75 */



    /* Set I2C 4 Slave Addresses Mask */

    I2C_SetSlaveAddrMask(I2C0, 0, 0x01);

    I2C_SetSlaveAddrMask(I2C0, 1, 0x04);

    I2C_SetSlaveAddrMask(I2C0, 2, 0x01);

    I2C_SetSlaveAddrMask(I2C0, 3, 0x04);



    /* Enable I2C interrupt */

    I2C_EnableInt(I2C0);

    NVIC_EnableIRQ(I2C0_IRQn);

}



void I2C0_Close(void)

{

    /* Disable I2C0 interrupt and clear corresponding NVIC bit */

    I2C_DisableInt(I2C0);

    NVIC_DisableIRQ(I2C0_IRQn);



    /* Disable I2C0 and close I2C0 clock */

    I2C_Close(I2C0);

    CLK_DisableModuleClock(I2C0_MODULE);

}



/*---------------------------------------------------------------------------------------------------------*/

/*  Main Function                                                                                          */

/*---------------------------------------------------------------------------------------------------------*/

int32_t main(void)

{

    uint32_t i;



    /* Unlock protected registers */

    SYS_UnlockReg();



    /* Init System, IP clock and multi-function I/O */

    SYS_Init();



    /* Init UART0 for printf */

    UART0_Init();



    /* Lock protected registers */

    SYS_LockReg();;



    /*

        This sample code is I2C SLAVE mode and it simulates EEPROM function

    */

    printf("\n");

    printf("+-----------------------------------------------------------------------+\n");

    printf("| NUC123 I2C Driver Sample Code (Slave) for wake-up & access Slave test |\n");

    printf("| Needs to work with I2C_Wakeup_Master sample code.                     |\n");

    printf("|      I2C Master (I2C0) <---> I2C Slave (I2C0)                         |\n");

    printf("| !! This sample code requires two borads to test !!                    |\n");

    printf("+-----------------------------------------------------------------------+\n");



    printf("Configure I2C0 as a slave.\n");

    printf("The I/O connection for I2C0:\n");

    printf("I2C0_SDA(PF.2), I2C0_SCL(PF.3)\n");



    /* Init I2C0 */

    I2C0_Init();



    for(i = 0; i < 0x100; i++)

    {

        g_au8SlvData[i] = 0;

    }



    /* I2C function to Transmit/Receive data as slave */

    s_I2C0HandlerFn = I2C_SlaveTRx;

                

    /* Set I2C0 enter Not Address SLAVE mode */

    I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI_AA);



    /* Unlock protected registers */

    SYS_UnlockReg();



    /* Enable power wake-up interrupt */

    CLK->PWRCON |= CLK_PWRCON_PD_WU_INT_EN_Msk;

    NVIC_EnableIRQ(PWRWU_IRQn);



    /* Enable I2C wake-up */

    I2C_EnableWakeup(I2C0);



    printf("\n");

    printf("Enter PD 0x%x 0x%x\n", I2C0->I2CON , I2C0->I2CSTATUS);

    printf("\n");

    printf("CHIP enter power down status.\n");

    /* Waiting for UART printf finish*/

    while(((UART0->FSR) & UART_FSR_TE_FLAG_Msk) == 0);



    if(((I2C0->I2CON)&I2C_I2CON_SI_Msk) != 0)

    {

        I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI);

    }

    

    /*  Use WFI instruction to idle the CPU. NOTE:

        If ICE is attached, system will wakeup immediately because ICE is a wakeup event. */

    CLK_PowerDown();



    while((g_u8SlvPWRDNWK & g_u8SlvI2CWK) == 0);    

    printf("Power-down Wake-up INT 0x%x\n", ((CLK->PWRCON) & CLK_PWRCON_PD_WU_STS_Msk));                

    printf("I2C0 WAKE INT 0x%x\n", I2C0->I2CWKUPSTS);

                

    /* Disable power wake-up interrupt */

    CLK->PWRCON &= ~CLK_PWRCON_PD_WU_INT_EN_Msk;

    NVIC_DisableIRQ(PWRWU_IRQn);



    /* Lock protected registers */

    SYS_LockReg();



    printf("\n");

    printf("Slave wake-up from power down status.\n");



    printf("\n");

    printf("Slave Waiting for receiving data.\n");



    while(1);

}