/*****************************************************************************
 * Copyright (c) 2019, Nsing Technologies Pte. Ltd
 *
 * All rights reserved.
 * ****************************************************************************
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the disclaimer below.
 *
 * Nsing' name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY Nsing "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * DISCLAIMED. IN NO EVENT SHALL Nsing BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * ****************************************************************************/

/**
 * @file main.c
 * @author Nsing 
 * @version v1.0.0
 *
 * @copyright Copyright (c) 2019, Nsingechnologies Pte. Ltd All rights reserved.
 */
#include "n32g031.h"
#include "n32g031_i2c.h"
#include "main.h"
#include "log.h"
/** @addtogroup N32G031_StdPeriph_Examples
 * @{
 */

/** @addtogroup I2C_Master_Int
 * @{
 */

#define I2C_MASTER_LOW_LEVEL
#define TEST_BUFFER_SIZE  100
#define I2CT_FLAG_TIMEOUT ((uint32_t)0x1000)
#define I2CT_LONG_TIMEOUT ((uint32_t)(10 * I2CT_FLAG_TIMEOUT))
#define I2C_MASTER_ADDR   0x30
#define I2C_SLAVE_ADDR    0x10

#define I2C1_TEST
#define I2Cx I2C1
#define I2Cx_SCL_PIN GPIO_PIN_6
#define I2Cx_SDA_PIN GPIO_PIN_7
#define GPIOx        GPIOB
#define GPIO_AF_I2C GPIO_AF6_I2C1

static uint8_t tx_buf[TEST_BUFFER_SIZE] = {0};
static uint8_t rx_buf[TEST_BUFFER_SIZE] = {0};
volatile Status test_status      = FAILED;
static __IO uint32_t I2CTimeout;
static CommCtrl_t Comm_Flag = C_READY; // Avoid star flag and stop flag set 1 at the same time
static uint8_t RCC_RESET_Flag = 0;

static uint8_t rx_num = 0;
static uint8_t tx_num = 0;
uint8_t flag_master_recv_finish = 0;
uint8_t flag_master_send_finish = 0;
uint8_t flag_trans_direct       = 0; // write

Status Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength);
void Memset(void* s, uint8_t c, uint32_t count);
void CommTimeOut_CallBack(ErrCode_t errcode);
    
/**
 * @brief  system delay function
 * @param 
 */
void Delay(uint32_t nCount)
{
    uint32_t tcnt;
    while (nCount--)
    {
        tcnt = 48000 / 5;
        while (tcnt--){;}
    }
}

void Delay_us(uint32_t nCount)
{
    uint32_t tcnt;
    while (nCount--)
    {
        tcnt = 48 / 5;
        while (tcnt--){;}
    }
}

/**
 * @brief  i2c Interrupt configuration
 * @param ch I2C channel
 */
void NVIC_ConfigurationMaster(uint8_t ch)
{
    NVIC_InitType NVIC_InitStructure;
    if (ch == 1)
    {
        NVIC_InitStructure.NVIC_IRQChannel = I2C1_IRQn;
    }
    if (ch == 2)
    {
        NVIC_InitStructure.NVIC_IRQChannel = I2C2_IRQn;
    }

    NVIC_InitStructure.NVIC_IRQChannelPriority           = 3;
    NVIC_InitStructure.NVIC_IRQChannelCmd                = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

/**
 * @brief  i2c Interrupt disable
 * @param ch I2C channel
 */
void NVIC_ConfigurationMasterDis(void)
{
    NVIC_InitType NVIC_InitStructure;

    NVIC_InitStructure.NVIC_IRQChannel                   = I2C1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPriority           = 3;
    NVIC_InitStructure.NVIC_IRQChannelCmd                = DISABLE;
    NVIC_Init(&NVIC_InitStructure);
}


/**
 * @brief  i2c master init
 * @return 0:init finish
 *
 */
int i2c_master_init(void)
{
    I2C_InitType i2c1_master;
    GPIO_InitType i2c1_gpio;
    RCC_EnableAPB1PeriphClk(RCC_APB1_PERIPH_I2C1, ENABLE);
    RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_GPIOB, ENABLE);

    GPIO_InitStruct(&i2c1_gpio);
    /*PB6 -- SCL; PB7 -- SDA*/
    i2c1_gpio.Pin        = I2Cx_SCL_PIN | I2Cx_SDA_PIN;
    i2c1_gpio.GPIO_Speed = GPIO_SPEED_HIGH;
    i2c1_gpio.GPIO_Mode  = GPIO_MODE_AF_OD;
    i2c1_gpio.GPIO_Alternate = GPIO_AF_I2C;
    i2c1_gpio.GPIO_Pull = GPIO_PULL_UP;	  
    GPIO_InitPeripheral(GPIOx, &i2c1_gpio);

    I2C_DeInit(I2Cx);
    i2c1_master.BusMode     = I2C_BUSMODE_I2C;
    i2c1_master.FmDutyCycle = I2C_FMDUTYCYCLE_2;
    i2c1_master.OwnAddr1    = I2C_MASTER_ADDR;
    i2c1_master.AckEnable   = I2C_ACKEN;
    i2c1_master.AddrMode    = I2C_ADDR_MODE_7BIT;
    i2c1_master.ClkSpeed    = 100000; // 100000 100K

    I2C_Init(I2Cx, &i2c1_master);
    // int enable
    I2C_ConfigInt(I2Cx, I2C_INT_EVENT | I2C_INT_BUF | I2C_INT_ERR, ENABLE);
    NVIC_ConfigurationMaster(1);
    I2C_Enable(I2Cx, ENABLE);
    return 0;
}

/**
 * @brief   Main program
 */
int main(void)
{
    uint16_t i = 0;
    // USART_Config();
    log_init();
    log_info("\n\rthis is a i2c master int demo\r\n");

    i2c_master_init();

    /* Fill the buffer to send */
    for (i = 0; i < TEST_BUFFER_SIZE; i++)
    {
        tx_buf[i] = i;
    }
    /* First write in the memory followed by a read of the written data --------*/
    /* Write data*/
    flag_trans_direct = 0;
    if (Comm_Flag == C_READY)
    {
        Comm_Flag = C_START_BIT;
        I2C_GenerateStart(I2C1, ENABLE);
    }
    
    I2CTimeout = I2CT_LONG_TIMEOUT * 1000;
    while (flag_master_send_finish == 0)
    {
        if ((I2CTimeout--) == 0)
        {
            CommTimeOut_CallBack(MASTER_UNKNOW);
        }
    }
    
    /* master send finish */
    flag_master_send_finish = 0;
    I2CTimeout = I2CT_LONG_TIMEOUT;
    while (I2C_GetFlag(I2C1, I2C_FLAG_BUSY))
    {
        if ((I2CTimeout--) == 0)
        {
            CommTimeOut_CallBack(MASTER_BUSY);
        }
    }
    Comm_Flag = C_READY;

    I2C_ConfigAck(I2C1, ENABLE);
    /* read data */
    flag_trans_direct = 1;
    if (Comm_Flag == C_READY)
    {
        Comm_Flag = C_START_BIT;
        I2C_GenerateStart(I2C1, ENABLE);
    }
    
    I2CTimeout = I2CT_LONG_TIMEOUT * 1000;
    while (flag_master_recv_finish == 0)
    {
        if ((I2CTimeout--) == 0)
        {
            CommTimeOut_CallBack(MASTER_UNKNOW);
        }
    }
        
    /* master recv finish */
    flag_master_recv_finish = 0;
    I2CTimeout = I2CT_LONG_TIMEOUT;
    while (I2C_GetFlag(I2C1, I2C_FLAG_BUSY))
    {
        if ((I2CTimeout--) == 0)
        {
            CommTimeOut_CallBack(MASTER_BUSY);
        }
    }
    Comm_Flag = C_READY;

    /* Check if the data written to the memory is read correctly */
    test_status = Buffercmp(tx_buf, rx_buf, TEST_BUFFER_SIZE);
    if (test_status == PASSED) /* test_status = PASSED, if the write and read dataare the same  */
    {
        log_info("the write and read data the same, i2c master int test pass\r\n");
    }
    else /* test_status = FAILED, if the write and read dataare different */
    {
        log_info("the write and read data are different, i2c master int test fail\r\n");
    }

    while (1)
    {
    }
}
 /*
 * @brief  i2c Interrupt service function
 *
 */
void I2C1_IRQHandler(void)
{
    uint32_t last_event = 0;

    last_event = I2C_GetLastEvent(I2C1);
    if ((last_event & I2C_ROLE_MASTER) == I2C_ROLE_MASTER) // master mode
    {
        switch (last_event)
        {
        case I2C_EVT_MASTER_MODE_FLAG: // 0x00030001.EV5 Send addr
            
            if(flag_trans_direct)     // read
            {
                Memset(rx_buf, 0, TEST_BUFFER_SIZE); // clear recv buf, ready to recv data
                I2C_SendAddr7bit(I2C1, I2C_SLAVE_ADDR, I2C_DIRECTION_RECV);
                rx_num = 0;
            }
            else // write
            {
                I2C_SendAddr7bit(I2C1, I2C_SLAVE_ADDR, I2C_DIRECTION_SEND);
                tx_num = 0;
            }
            break;

           // MasterTransmitter	
        case I2C_EVT_MASTER_TXMODE_FLAG: // 0x00070082. EV6 Send first data
            Comm_Flag = C_READY;
            I2C_SendData(I2C1, tx_buf[tx_num++]);
            break;

        case I2C_EVT_MASTER_DATA_SENDING: // 0x00070080. EV8 Sending data
            
            if (tx_num < TEST_BUFFER_SIZE)
            {
                I2C_SendData(I2C1, tx_buf[tx_num++]);
            }
            break;
            
        case I2C_EVT_MASTER_DATA_SENDED: // 0x00070084.EV8_2 Send finish
            
            if (tx_num == TEST_BUFFER_SIZE)
            {
                if (Comm_Flag == C_READY)
                {
                    Comm_Flag = C_STOP_BIT;
                    I2C_GenerateStop(I2C1, ENABLE);
                    flag_master_send_finish = 1;
                }
            }
            break;
            
            // MasterReceiver
        case I2C_EVT_MASTER_RXMODE_FLAG: // 0x00030002.EV6
            Comm_Flag = C_READY;
            if (TEST_BUFFER_SIZE == 1)
            {
                I2C_ConfigAck(I2C1, DISABLE);
                if (Comm_Flag == C_READY)
                {
                    Comm_Flag = C_STOP_BIT;
                    I2C_GenerateStop(I2C1, ENABLE);
                }
            }
            else if (TEST_BUFFER_SIZE == 2)
            {
                I2C1->CTRL1 |= I2C_NACK_POS_NEXT; /// set ACKPOS
                I2C_ConfigAck(I2C1, DISABLE);
            }
            break;

        case I2C_EVT_MASTER_DATA_RECVD_FLAG: // 0x00030040. EV7.one byte recved 
        case I2C_EVT_MASTER_DATA_RECVD_BSF_FLAG: // 0x00030044. EV7.When the I2C communication rate is too high, BSF = 1
            
            rx_buf[rx_num++] = I2C_RecvData(I2C1);
            if (rx_num == (TEST_BUFFER_SIZE - 1))
            { 
                I2C_ConfigAck(I2C1, DISABLE);   // Disable I2C1 acknowledgement.
                if (Comm_Flag == C_READY)
                {
                    Comm_Flag = C_STOP_BIT;
                    I2C_GenerateStop(I2C1, ENABLE); // Send I2C1 STOP Condition.
                }
            }
            else if (rx_num == TEST_BUFFER_SIZE)
            {
                flag_master_recv_finish = 1;
            }
            break;
        case 0x00030201: // Arbitration lost
        case 0x00030401: // Acknowledge failure
        case 0x00030501: // Acknowledge failure and Bus error
            I2C_Enable(I2C1, DISABLE);
            I2C_Enable(I2C1, ENABLE);
            break;

        default:
            log_info("I2C error status:0x%x\r\n", last_event);
            break;
        }
    }
}



/**
 * @brief  Compares two buffers.
 * @param  pBuffer, pBuffer1: buffers to be compared.
 * @param BufferLength buffer's length
 * @return PASSED: pBuffer identical to pBuffer1
 *         FAILED: pBuffer differs from pBuffer1
 */
Status Buffercmp(uint8_t* pBuffer, uint8_t* pBuffer1, uint16_t BufferLength)
{
    while (BufferLength--)
    {
        if (*pBuffer != *pBuffer1)
        {
            return FAILED;
        }

        pBuffer++;
        pBuffer1++;
    }

    return PASSED;
}

/**
 * @brief memery set a value
 * @param s source
 * @param c value
 * @param count number
 * @return pointer of the memery
 */
void Memset(void* s, uint8_t c, uint32_t count)
{
    char* xs = (char*)s;

    while (count--) // clear 17byte buffer
    {
        *xs++ = c;
    }

    return;
}


void IIC_RestoreSlaveByClock(void)
{
    uint8_t i;
    GPIO_InitType i2cx_gpio;
    
    RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_GPIOB, ENABLE);
    GPIO_AFIOInitDefault();
    GPIO_DeInit(GPIOx);
    
    i2cx_gpio.Pin        = I2Cx_SCL_PIN;
    i2cx_gpio.GPIO_Speed = GPIO_SPEED_HIGH;
    i2cx_gpio.GPIO_Mode  = GPIO_MODE_OUTPUT_PP;
    GPIO_InitPeripheral(GPIOx, &i2cx_gpio);
    
    for (i = 0; i < 9; i++)
    {
        GPIO_SetBits(GPIOx, I2Cx_SCL_PIN);
        Delay_us(5);
        GPIO_ResetBits(GPIOx, I2Cx_SCL_PIN);
        Delay_us(5);
    }
}

void SystemNVICReset(void)
{
    
    __disable_irq();
    log_info("***** NVIC system reset! *****\r\n");
    NVIC_SystemReset();
}

void IIC_RCCReset(void)
{
    if (RCC_RESET_Flag >= 3)
    {
        SystemNVICReset();
    }
    else
    {
        RCC_RESET_Flag++;
        
        RCC_EnableAPB1PeriphReset(RCC_APB1_PERIPH_I2C1, ENABLE);
        RCC_EnableAPB1PeriphReset(RCC_APB1_PERIPH_I2C1, DISABLE);
        
        RCC_EnableAPB1PeriphClk(RCC_APB1_PERIPH_I2C1, DISABLE );
        GPIOB->PMODE &= 0xFFFF0FFF; //input
        RCC_EnableAPB2PeriphClk( RCC_APB2_PERIPH_AFIO, DISABLE);
        RCC_EnableAPB2PeriphClk (RCC_APB2_PERIPH_GPIOB, DISABLE );
        
        RCC_EnableAPB1PeriphReset(RCC_APB1_PERIPH_I2C1, ENABLE);
        RCC_EnableAPB1PeriphReset(RCC_APB1_PERIPH_I2C1, DISABLE);
        
        IIC_RestoreSlaveByClock();
        
        log_info("***** IIC module by RCC reset! *****\r\n");
        i2c_master_init();
    }
}

void IIC_SWReset(void)
{
    GPIO_InitType i2cx_gpio;
    
    i2cx_gpio.Pin        = I2Cx_SCL_PIN | I2Cx_SDA_PIN;
    i2cx_gpio.GPIO_Speed = GPIO_SPEED_HIGH;
    i2cx_gpio.GPIO_Mode  = GPIO_MODE_INPUT;
    GPIO_InitPeripheral(GPIOx, &i2cx_gpio);
    
    I2CTimeout = I2CT_LONG_TIMEOUT;
    for (;;)
    {
        if ((I2Cx_SCL_PIN | I2Cx_SDA_PIN) == (GPIOx->PID & (I2Cx_SCL_PIN | I2Cx_SDA_PIN)))
        {
            I2Cx->CTRL1 |= 0x8000;
            __NOP();
            __NOP();
            __NOP();
            __NOP();
            __NOP();
            I2Cx->CTRL1 &= ~0x8000;
            
            log_info("***** IIC module self reset! *****\r\n");
            break;
        }
        else
        {
            if ((I2CTimeout--) == 0)
            {
                IIC_RCCReset();
            }
        }
    }
}

void CommTimeOut_CallBack(ErrCode_t errcode)
{
    log_info("...ErrCode:%d\r\n", errcode);
    
#if (COMM_RECOVER_MODE == MODULE_SELF_RESET)
    IIC_SWReset();
#elif (COMM_RECOVER_MODE == MODULE_RCC_RESET)
    IIC_RCCReset();
#elif (COMM_RECOVER_MODE == SYSTEM_NVIC_RESET)
    SystemNVICReset();
#endif
}
/**
 * @}
 */
