/*****************************************************************************
 * 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
 * @{
 */


//#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

#ifdef NON_REENTRANT // Avoid function reentrant
static uint32_t Mutex_Flag = 0;
#endif

#define I2C1_TEST
#define I2C1_REMAP
#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;
Status Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength);
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--){;}
    }
}
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; //if the spped greater than 400KHz, the FmDutyCycle mast be configured to 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;

    I2C_Init(I2Cx, &i2c1_master);

    I2C_Enable(I2Cx, ENABLE);
    return 0;
}

int i2c_master_send(uint8_t* data, int len)
{
    uint8_t* sendBufferPtr = data;
    
#ifdef NON_REENTRANT
    if (Mutex_Flag)
        return -1;
    else
        Mutex_Flag = 1; // Enter function,Mutex_Flag = 1
#endif
    
    I2CTimeout             = I2CT_LONG_TIMEOUT;
    while (I2C_GetFlag(I2C1, I2C_FLAG_BUSY))
    {
        if ((I2CTimeout--) == 0)
        {
            CommTimeOut_CallBack(MASTER_BUSY);
        }
    }
    
    if (Comm_Flag == C_READY)
    {
        Comm_Flag = C_START_BIT;
        I2C_GenerateStart(I2C1, ENABLE);
    }
    
    I2CTimeout = I2CT_LONG_TIMEOUT;
    while (!I2C_CheckEvent(I2C1, I2C_EVT_MASTER_MODE_FLAG)) // EV5
    {
        if ((I2CTimeout--) == 0)
        {
            CommTimeOut_CallBack(MASTER_MODE);
        }
    }
    
    I2C_SendAddr7bit(I2C1, I2C_SLAVE_ADDR, I2C_DIRECTION_SEND);   
    I2CTimeout = I2CT_LONG_TIMEOUT;
    while (!I2C_CheckEvent(I2C1, I2C_EVT_MASTER_TXMODE_FLAG)) // EV6
    {
        if ((I2CTimeout--) == 0)
        {
            CommTimeOut_CallBack(MASTER_TXMODE);
        }
    }
    Comm_Flag = C_READY;
    
    // send data
    while (len-- > 0)
    {
        I2C_SendData(I2C1, *sendBufferPtr++);
        I2CTimeout = I2CT_LONG_TIMEOUT;
        while (!I2C_CheckEvent(I2C1, I2C_EVT_MASTER_DATA_SENDING)) // EV8
        {
            if ((I2CTimeout--) == 0)
            {
                CommTimeOut_CallBack(MASTER_SENDING);
            }
        }
    }

    I2CTimeout = I2CT_LONG_TIMEOUT;
    while (!I2C_CheckEvent(I2C1, I2C_EVT_MASTER_DATA_SENDED)) // EV8-2
    {
        if ((I2CTimeout--) == 0)
        {
            CommTimeOut_CallBack(MASTER_SENDED);
        }
    }
    
    if (Comm_Flag == C_READY)
    {
        Comm_Flag = C_STOP_BIT;
        I2C_GenerateStop(I2C1, ENABLE);
    }
    
    while (I2C_GetFlag(I2C1, I2C_FLAG_BUSY))
    {
        if ((I2CTimeout--) == 0)
        {
            CommTimeOut_CallBack(MASTER_BUSY);
        }
    }
    Comm_Flag = C_READY;

#ifdef NON_REENTRANT
    if (Mutex_Flag)
        Mutex_Flag = 0; // Exit function,Mutex_Flag = 0
    else
        return -2;
#endif
    
    return 0;
}

int i2c_master_recv(uint8_t* data, int len)
{
    uint8_t* recvBufferPtr = data;

#ifdef NON_REENTRANT
    if (Mutex_Flag)
        return -1;
    else
        Mutex_Flag = 1; // Enter function,Mutex_Flag = 1
#endif
    
    I2CTimeout             = I2CT_LONG_TIMEOUT;
    while (I2C_GetFlag(I2C1, I2C_FLAG_BUSY))
    {
        if ((I2CTimeout--) == 0)
        {
            CommTimeOut_CallBack(MASTER_BUSY);
        }
    }
    I2C_ConfigAck(I2C1, ENABLE);

    // send start
    if (Comm_Flag == C_READY)
    {
        Comm_Flag = C_START_BIT;
        I2C_GenerateStart(I2C1, ENABLE);
    }
    
    I2CTimeout = I2CT_LONG_TIMEOUT;
    while (!I2C_CheckEvent(I2C1, I2C_EVT_MASTER_MODE_FLAG)) // EV5
    {
        if ((I2CTimeout--) == 0)
        {
            CommTimeOut_CallBack(MASTER_MODE);
        }
    }
    // send addr
    I2C_SendAddr7bit(I2C1, I2C_SLAVE_ADDR, I2C_DIRECTION_RECV);
    I2CTimeout = I2CT_LONG_TIMEOUT;
    while (!I2C_CheckEvent(I2C1, I2C_EVT_MASTER_RXMODE_FLAG)) // EV6
    {
        if ((I2CTimeout--) == 0)
        {
            CommTimeOut_CallBack(MASTER_RXMODE);
        }
    }
    Comm_Flag = C_READY;
    
    if (len == 1)
    {
        I2C_ConfigAck(I2C1, DISABLE);
        (void)(I2C1->STS1); /// clear ADDR
        (void)(I2C1->STS2);
        if (Comm_Flag == C_READY)
        {
            Comm_Flag = C_STOP_BIT;
            I2C_GenerateStop(I2C1, ENABLE);
        }
        
        I2CTimeout = I2CT_LONG_TIMEOUT;
        while (!I2C_GetFlag(I2C1, I2C_FLAG_RXDATNE))
        {
            if ((I2CTimeout--) == 0)
            {
                CommTimeOut_CallBack(MASTER_RECVD);
            }
        }
        *recvBufferPtr++ = I2C_RecvData(I2C1);
        len--;
    }
    else if (len == 2)
    {
        I2C1->CTRL1 |= 0x0800; /// set ACKPOS
        (void)(I2C1->STS1);
        (void)(I2C1->STS2);
        I2C_ConfigAck(I2C1, DISABLE);
        
        I2CTimeout = I2CT_LONG_TIMEOUT;
        while (!I2C_GetFlag(I2C1, I2C_FLAG_BYTEF))
        {
            if ((I2CTimeout--) == 0)
            {
                CommTimeOut_CallBack(MASTER_BYTEF);
            }
        }
        
        if (Comm_Flag == C_READY)
        {
            Comm_Flag = C_STOP_BIT;
            I2C_GenerateStop(I2C1, ENABLE);
        }
        
        *recvBufferPtr++ = I2C_RecvData(I2C1);
        len--;
        *recvBufferPtr++ = I2C_RecvData(I2C1);
        len--;
    }
    else
    {
        I2C_ConfigAck(I2C1, ENABLE);
        (void)(I2C1->STS1);
        (void)(I2C1->STS2);
        
        while (len)
        {
            if (len == 3)
            {
                I2CTimeout = I2CT_LONG_TIMEOUT;
                while (!I2C_GetFlag(I2C1, I2C_FLAG_BYTEF))
                {
                    if ((I2CTimeout--) == 0)
                    {
                        CommTimeOut_CallBack(MASTER_BYTEF);
                    }
                }
                I2C_ConfigAck(I2C1, DISABLE);
                *recvBufferPtr++ = I2C_RecvData(I2C1);
                len--;
                
                I2CTimeout = I2CT_LONG_TIMEOUT;
                while (!I2C_GetFlag(I2C1, I2C_FLAG_BYTEF))
                {
                    if ((I2CTimeout--) == 0)
                    {
                        CommTimeOut_CallBack(MASTER_BYTEF);
                    }
                }
                
                if (Comm_Flag == C_READY)
                {
                    Comm_Flag = C_STOP_BIT;
                    I2C_GenerateStop(I2C1, ENABLE);
                }
        
                *recvBufferPtr++ = I2C_RecvData(I2C1);
                len--;
                *recvBufferPtr++ = I2C_RecvData(I2C1);
                len--;
                
                break;
            }
            
            I2CTimeout = I2CT_LONG_TIMEOUT;
            while (!I2C_CheckEvent(I2C1, I2C_EVT_MASTER_DATA_RECVD_FLAG)) // EV7
            {
                if ((I2CTimeout--) == 0)
                {
                    CommTimeOut_CallBack(MASTER_RECVD);
                }
            }
            *recvBufferPtr++ = I2C_RecvData(I2C1);
            len--;
        }
    }
    
    I2CTimeout = I2CT_LONG_TIMEOUT;
    while (I2C_GetFlag(I2C1, I2C_FLAG_BUSY))
    {
        if ((I2CTimeout--) == 0)
        {
            CommTimeOut_CallBack(MASTER_BUSY);
        }
    }
    Comm_Flag = C_READY;
    
#ifdef NON_REENTRANT
    if (Mutex_Flag)
        Mutex_Flag = 0; // Exit function,Mutex_Flag = 0
    else
        return -2;
#endif
    
    return 0;
}

/**
 * @brief   Main program
 */
int main(void)
{
    uint16_t i = 0;

    log_init();
    log_info(" this is a i2c master demo\r\n");
    /* Initialize the I2C EEPROM driver ----------------------------------------*/
    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*/
    i2c_master_send(tx_buf, TEST_BUFFER_SIZE);

    /* Read data */
    i2c_master_recv(rx_buf, TEST_BUFFER_SIZE);

    /* 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)
    {
        log_info("write and read data the same, i2c master test pass\r\n");
        log_info("recv = ");
        for (i = 0; i < TEST_BUFFER_SIZE; i++)
        {
                log_info("%02x", rx_buf[i]);
        }
        log_info("\r\n");
    }
    else
    {
        log_info("write and read data are different, i2c master test fail\r\n");
    }
    /* test_status = PASSED, if the write and read data are the same  */
    /* test_status = FAILED, if the write and read data are different */
    while (1)
    {
    }
}

/**
 * @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;
}

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
}

/**
 * @}
 */
