/**
*     Copyright (c) 2022, Nations Technologies Inc.
* 
*     All rights reserved.
*
*     This software is the exclusive property of Nations Technologies Inc. (Hereinafter 
* referred to as NATIONS). This software, and the product of NATIONS described herein 
* (Hereinafter referred to as the Product) are owned by NATIONS under the laws and treaties
* of the People's Republic of China and other applicable jurisdictions worldwide.
*
*     NATIONS does not grant any license under its patents, copyrights, trademarks, or other 
* intellectual property rights. Names and brands of third party may be mentioned or referred 
* thereto (if any) for identification purposes only.
*
*     NATIONS reserves the right to make changes, corrections, enhancements, modifications, and 
* improvements to this software at any time without notice. Please contact NATIONS and obtain 
* the latest version of this software before placing orders.

*     Although NATIONS has attempted to provide accurate and reliable information, NATIONS assumes 
* no responsibility for the accuracy and reliability of this software.
* 
*     It is the responsibility of the user of this software to properly design, program, and test 
* the functionality and safety of any application made of this information and any resulting product. 
* In no event shall NATIONS be liable for any direct, indirect, incidental, special,exemplary, or 
* consequential damages arising in any way out of the use of this software or the Product.
*
*     NATIONS Products are neither intended nor warranted for usage in systems or equipment, any
* malfunction or failure of which may cause loss of human life, bodily injury or severe property 
* damage. Such applications are deemed, "Insecure Usage".
*
*     All Insecure Usage shall be made at user's risk. User shall indemnify NATIONS and hold NATIONS 
* harmless from and against all claims, costs, damages, and other liabilities, arising from or related 
* to any customer's Insecure Usage.

*     Any express or implied warranty with regard to this software or the Product, including,but not 
* limited to, the warranties of merchantability, fitness for a particular purpose and non-infringement
* are disclaimed to the fullest extent permitted by law.

*     Unless otherwise explicitly permitted by NATIONS, anyone may not duplicate, modify, transcribe
* or otherwise distribute this software for any purposes, in whole or in part.
*
*     NATIONS products and technologies shall not be used for or incorporated into any products or systems
* whose manufacture, use, or sale is prohibited under any applicable domestic or foreign laws or regulations. 
* User shall comply with any applicable export control laws and regulations promulgated and administered by 
* the governments of any countries asserting jurisdiction over the parties or transactions.
**/

/**
*\*\file main.c
*\*\author Nations 
*\*\version v1.0.0
*\*\copyright Copyright (c) 2022, Nations Technologies Inc. All rights reserved.
**/
#include "n32a003.h"
#include "n32a003_i2c.h"
#include "main.h"
#include "log.h"


/** I2C_Master_Int **/

#define I2C_MASTER_LOW_LEVEL
#define I2C_MASTER_SPEED  100000 /* 100K */
#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 I2C_TEST
#define I2Cx         I2C
#define I2Cx_SCL_PIN GPIO_PIN_4
#define I2Cx_SDA_PIN GPIO_PIN_5
#define GPIOx        GPIOA
#define GPIO_AF_I2C  GPIO_AF6_I2C

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 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);
    
/**
*\*\name    Delay.
*\*\fun     system ms delay function.
*\*\param   nCount
*\*\return  none 
**/
void Delay(uint32_t nCount)
{
    uint32_t tcnt;
    while (nCount--)
    {
        tcnt = 48000 / 5;
        while (tcnt--){;}
    }
}

/**
*\*\name    Delay_us.
*\*\fun     system us delay function.
*\*\param   nCount
*\*\return  none 
**/
void Delay_us(uint32_t nCount)
{
    uint32_t tcnt;
    while (nCount--)
    {
        tcnt = 48 / 5;
        while (tcnt--){;}
    }
}

/**
*\*\name    NVIC_ConfigurationMaster.
*\*\fun     NVIC Configuration.
*\*\param   none
*\*\return  result 
**/
void NVIC_ConfigurationMaster(void)
{
    NVIC_InitType NVIC_InitStructure;
    
    NVIC_InitStructure.NVIC_IRQChannel           = I2C_EV_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPriority   = 1;
    NVIC_InitStructure.NVIC_IRQChannelCmd        = ENABLE;
    NVIC_Initializes(&NVIC_InitStructure);
    
    NVIC_InitStructure.NVIC_IRQChannel           = I2C_ER_IRQn; /* test err */
    NVIC_InitStructure.NVIC_IRQChannelPriority   = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd        = ENABLE;
    NVIC_Initializes(&NVIC_InitStructure);
}



/**
*\*\name    i2c_master_init.
*\*\fun     master gpio/rcc/i2c/nvic initializes.
*\*\param   none
*\*\return  result 
**/
int i2c_master_init(void)
{
    I2C_InitType i2c_master;
    GPIO_InitType i2c_gpio;
    
    RCC_APB_Peripheral_Clock_Enable(RCC_APB_PERIPH_I2C);
    RCC_APB_Peripheral_Clock_Enable(RCC_APB_PERIPH_IOPA|RCC_APB_PERIPH_AFIO);
    GPIOx->POD |= (I2Cx_SCL_PIN | I2Cx_SDA_PIN);//pull up pin

    GPIO_Structure_Initialize(&i2c_gpio);
    /*PA4 -- SCL; PA5 -- SDA*/
    i2c_gpio.Pin            = I2Cx_SCL_PIN | I2Cx_SDA_PIN;
    i2c_gpio.GPIO_Slew_Rate = GPIO_SLEW_RATE_FAST; 
    i2c_gpio.GPIO_Mode      = GPIO_MODE_AF_OD;
    i2c_gpio.GPIO_Alternate = GPIO_AF_I2C;
    i2c_gpio.GPIO_Pull      = GPIO_PULL_UP; 
    GPIO_Peripheral_Initialize(GPIOx, &i2c_gpio);

    I2C_Reset(I2Cx);
    I2C_Initializes_Structure(&i2c_master);
    i2c_master.DutyCycle   = I2C_SMDUTYCYCLE_1;
    i2c_master.OwnAddr1    = I2C_MASTER_ADDR;
    i2c_master.AckEnable   = I2C_ACKEN;
    i2c_master.AddrMode    = I2C_ADDR_MODE_7BIT;
    i2c_master.ClkSpeed    = I2C_MASTER_SPEED; 

    I2C_Initializes(I2Cx, &i2c_master);
    /* int enable */
    I2C_Interrupts_Enable(I2Cx, I2C_INT_EVENT | I2C_INT_BUF | I2C_INT_ERR);
    NVIC_ConfigurationMaster();
    I2C_ON(I2Cx);
    return 0;
}

/**
*\*\name    main.
*\*\fun     main function.
*\*\param   none
*\*\return  none 
**/
int main(void)
{
    uint16_t i = 0;
    
    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_Generate_Start_Enable(I2C);
    }
    
    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_Flag_Status_Get(I2C, I2C_FLAG_BUSY))
    {
        if ((I2CTimeout--) == 0)
        {
            CommTimeOut_CallBack(MASTER_BUSY);
        }
    }
    Comm_Flag = C_READY;

    I2C_Acknowledg_Enable(I2C);
    /* read data */
    flag_trans_direct = 1;
    if (Comm_Flag == C_READY)
    {
        Comm_Flag = C_START_BIT;
        I2C_Generate_Start_Enable(I2C);
    }
    
    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_Flag_Status_Get(I2C, 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)
    {
    }
}

/**
*\*\name    I2C_EV_IRQHandler.
*\*\fun     i2c Interrupt service function.
*\*\param   none
*\*\return  none 
**/
void I2C_EV_IRQHandler(void)
{
    uint32_t last_event = 0;

    last_event = I2C_Last_Event_Get(I2C);
    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_7bit_Addr_Send(I2C, I2C_SLAVE_ADDR, I2C_DIRECTION_RECV);
                rx_num = 0;
            }
            else /* write */
            {
                I2C_7bit_Addr_Send(I2C, 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_Data_Send(I2C, tx_buf[tx_num++]);
            break;

        case I2C_EVT_MASTER_DATA_SENDING: /* 0x00070080. EV8 Sending data  */
            if (tx_num < TEST_BUFFER_SIZE)
            {
                I2C_Data_Send(I2C, 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_Generate_Stop_Enable(I2C);
                    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_Acknowledg_Disable(I2C);
                if (Comm_Flag == C_READY)
                {
                    Comm_Flag = C_STOP_BIT;
                    I2C_Generate_Stop_Enable(I2C);
                }
            }
            else if (TEST_BUFFER_SIZE == 2)
            {
                I2C->CTRL1 |= I2C_NACK_POS_NEXT; /* set ACKPOS */
                I2C_Acknowledg_Disable(I2C);
            }
            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_Data_Recv(I2C);
            if (rx_num == (TEST_BUFFER_SIZE - 1))
            { 
                I2C_Acknowledg_Disable(I2C);   /* Disable I2C acknowledgement. */
                if (Comm_Flag == C_READY)
                {
                    Comm_Flag = C_STOP_BIT;
                    I2C_Generate_Stop_Enable(I2C); /* Send I2C 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 */
        case 0x00070000: /* TRF, BUSY, MSMODE flags */
            I2C_OFF(I2C);
            I2C_ON(I2C);
            break;

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

/**
*\*\name    I2C_ER_IRQHandler.
*\*\fun     i2c error interrupt service function.
*\*\param   none
*\*\return  none 
**/
void I2C_ER_IRQHandler(void)
{
    if(I2C_Flag_Status_Get(I2C,I2C_FLAG_ACKFAIL))   
    {   
        I2C_Flag_Status_Clear(I2C, I2C_FLAG_ACKFAIL);
        I2C_Generate_Stop_Enable(I2C); /* Send I2C STOP Condition. */
        
    }
}

/**
*\*\name   Buffercmp.
*\*\fun    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;
}

/**
*\*\name  Memset.
*\*\fun   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;
}

/**
*\*\name    IIC_RestoreSlaveByClock.
*\*\fun     Emulate 9 clock recovery slave by GPIO.
*\*\param   none
*\*\return  none 
**/
void IIC_RestoreSlaveByClock(void)
{
    uint8_t i;
    GPIO_InitType i2cx_gpio;
    
    GPIOx->POD |= (I2Cx_SCL_PIN | I2Cx_SDA_PIN);//pull up pin
    RCC_APB_Peripheral_Clock_Enable(RCC_APB_PERIPH_IOPA);
    GPIOx->POD |= (I2Cx_SCL_PIN | I2Cx_SDA_PIN);//pull up pin
    
    GPIO_Structure_Initialize(&i2cx_gpio);
    i2cx_gpio.Pin            = I2Cx_SCL_PIN;
    i2cx_gpio.GPIO_Slew_Rate = GPIO_SLEW_RATE_FAST;
    i2cx_gpio.GPIO_Mode      = GPIO_MODE_OUT_PP;
    GPIO_Peripheral_Initialize(GPIOx, &i2cx_gpio);
    
    for (i = 0; i < 9; i++)
    {
        GPIO_Pins_Set(GPIOx, I2Cx_SCL_PIN);
        Delay_us(5);
        GPIO_PBC_Pins_Reset(GPIOx, I2Cx_SCL_PIN);
        Delay_us(5);
    }
}

/**
*\*\name    SystemNVICReset.
*\*\fun     System software reset.
*\*\param   none
*\*\return  none 
**/
void SystemNVICReset(void)
{
    
    __disable_irq();
    log_info("***** NVIC system reset! *****\r\n");
    NVIC_SystemReset();
}

/**
*\*\name    IIC_RCCReset.
*\*\fun     RCC clock reset.
*\*\param   none
*\*\return  none 
**/
void IIC_RCCReset(void)
{
   
    RCC_Peripheral_Reset(RCC_RST_I2CRST);
    
    IIC_RestoreSlaveByClock();
    
    log_info("***** IIC module by RCC reset! *****\r\n");
    i2c_master_init();
    
}

/**
*\*\name    IIC_SWReset.
*\*\fun     I2c software reset.
*\*\param   none
*\*\return  none 
**/
void IIC_SWReset(void)
{
    GPIO_InitType i2cx_gpio;
    
    GPIO_Structure_Initialize(&i2cx_gpio);
    i2cx_gpio.Pin            = I2Cx_SCL_PIN | I2Cx_SDA_PIN;
    i2cx_gpio.GPIO_Slew_Rate = GPIO_SLEW_RATE_FAST;
    i2cx_gpio.GPIO_Mode      = GPIO_MODE_INPUT;
    GPIO_Peripheral_Initialize(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 |= I2C_CTRL1_SWRESET;
            __NOP();
            __NOP();
            __NOP();
            __NOP();
            __NOP();
            I2Cx->CTRL1 &= ~I2C_CTRL1_SWRESET;
            
            log_info("***** IIC module self reset! *****\r\n");
            break;
        }
        else
        {
            if ((I2CTimeout--) == 0)
            {
                IIC_RCCReset();
            }
        }
    }
}

/**
*\*\name    CommTimeOut_CallBack.
*\*\fun     Callback function.
*\*\param   none
*\*\return  none 
**/
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
}

