//*****************************************************************************
//
// ti_master.c - Example demonstrating how to configure SSI2 in TI master mode.
//
// Copyright (c) 2010-2017 Texas Instruments Incorporated.  All rights reserved.
// Software License Agreement
//
// This is part of revision 2.1.4.178 of the Tiva Firmware Development Package.
//
//*****************************************************************************

#include <stdbool.h>
#include <stdint.h>
#include "inc/hw_gpio.h"
#include "inc/hw_ints.h"
#include "inc/hw_nvic.h"
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/debug.h"
#include "driverlib/fpu.h"
#include "driverlib/gpio.h"
#include "driverlib/interrupt.h"
#include "driverlib/pin_map.h"
#include "driverlib/rom.h"
#include "driverlib/pwm.h"
#include "driverlib/sysctl.h"
#include "driverlib/systick.h"
#include "driverlib/uart.h"
#include "utils/uartstdio.h"
#include "driverlib/adc.h"
#include "driverlib/timer.h"
#include "math.h"
#include "driverlib/ssi.h"
#include "driverlib/qei.h"

//*****************************************************************************
//
//! \addtogroup ssi_examples_list
//! <h1>TI Master (ti_master)</h1>
//!
//! This example shows how to configure the SSI0 as TI Master.  The code will
//! send three characters on the master Tx then poll the receive FIFO until
//! 3 characters are received on the master Rx.
//!
//! This example uses the following peripherals and I/O signals.  You must
//! review these and change as needed for your own board:
//! - SSI2 peripheral
//! - GPIO Port B peripheral (for SSI2 pins)
//! - SSI2Clk - PB4
//! - SSI2Fss - PB5
//! - SSI2Rx  - PB6
//! - SSI2Tx  - PB7
//!
//! The following UART signals are configured only for displaying console
//! messages for this example.  These are not required for operation of I2C0.
//! - UART0 peripheral
//! - GPIO Port A peripheral (for UART0 pins)
//! - UART0RX - PA0
//! - UART0TX - PA1
//!
//! This example uses the following interrupt handlers.  To use this example
//! in your own application you must add these interrupt handlers to your
//! vector table.
//! - None.
//
//*****************************************************************************

//*****************************************************************************
//
// Number of bytes to send and receive.
//
//*****************************************************************************
#define NUM_SSI_DATA            50
//*****************************************************************************
//
// Global variables used in interrupt handler and the main loop.
//
//*****************************************************************************
volatile unsigned long g_ulSSI2RXFF = 0, g_ulSSI2TXFF = 0;

uint32_t pui32DataTx[NUM_SSI_DATA] = {0};
uint32_t pui32DataRx[NUM_SSI_DATA] = {0};
uint32_t ulDataTx0[NUM_SSI_DATA] = {0};
uint32_t ulDataRx0[NUM_SSI_DATA] = {0};
uint32_t ui32DataRx1[NUM_SSI_DATA] = {0};

volatile uint32_t g_ui32ExpectedFIFOData = 11;
volatile uint32_t g_ui32Index = 0;


uint32_t TxFlag = 0;
uint32_t count = 0;
uint32_t len = 0;
uint32_t RxFlag = 0;

//*****************************************************************************
//
// This function sets up UART0 to be used for a console to display information
// as the example is running.
//
//*****************************************************************************
void
InitConsole(void)
{
    //
    // Enable UART0 so that we can configure the clock.
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);

    //
    // Enable GPIO port A which is used for UART0 pins.
    // TODO: change this to whichever GPIO port you are using.
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);

    //
    // Configure the pin muxing for UART0 functions on port A0 and A1.
    // This step is not necessary if your part does not support pin muxing.
    // TODO: change this to select the port/pin you are using.
    //
    GPIOPinConfigure(GPIO_PA0_U0RX);
    GPIOPinConfigure(GPIO_PA1_U0TX);

    //
    // Use the internal 16MHz oscillator as the UART clock source.
    //
    UARTClockSourceSet(UART0_BASE, UART_CLOCK_PIOSC);

    //
    // Select the alternate (UART) function for these pins.
    // TODO: change this to select the port/pin you are using.
    //
    GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);

    //
    // Initialize the UART for console I/O.
    //
    UARTStdioConfig(0, 115200, 16000000);

}
//*****************************************************************************
//
// Configure SSI2 in Master TI mode.  This example will send out 10 bytes of
// data, then wait for 3 bytes of data to come in.  This will all be done using
// the interrupt method.
//
//*****************************************************************************
void
InitSSI2(void)
{
    //
    // The SSI0 peripheral must be enabled for use.
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI2);

    //
    // For this example SSI2 is used with PortA[5:2].  The actual port and
    // pins used may be different on your part, consult the data sheet for
    // more information.  GPIO port A needs to be enabled so these pins can
    // be used.
    // TODO: change this to whichever GPIO port you are using.
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);

    //
    //
    // Configure the pin muxing for SSI2 functions on port A2, A3, A4, and A5.
    // This step is not necessary if your part does not support pin muxing.
    // TODO: change this to select the port/pin you are using.
    //

    GPIOPinConfigure(GPIO_PB4_SSI2CLK);
    GPIOPinConfigure(GPIO_PB5_SSI2FSS);
    GPIOPinConfigure(GPIO_PB6_SSI2RX);
    GPIOPinConfigure(GPIO_PB7_SSI2TX);

    //
    // Configure the GPIO settings for the SSI pins.  This function also gives
    // control of these pins to the SSI hardware.  Consult the data sheet to
    // see which functions are allocated per pin.
    // The pins are assigned as follows:
    //      PB7 - SSI0Tx
    //      PB6 - SSI0Rx
    //      PB5 - SSI0Fss
    //      PB4 - SSI0CLK
    // TODO: change this to select the port/pin you are using.
    //
    GPIOPinTypeSSI(GPIO_PORTB_BASE,GPIO_PIN_7|GPIO_PIN_6|GPIO_PIN_5|GPIO_PIN_4);


    //
    // Configure and enable the SSI port for TI master mode.  Use SSI2, system
    // clock supply, master mode, 1MHz SSI frequency, and 8-bit data.
    //
    SSIConfigSetExpClk(SSI2_BASE, SysCtlClockGet(),SSI_FRF_MOTO_MODE_0,SSI_MODE_MASTER,10000, 8);

    //
    // Enable SSI2 module
    //
    SSIEnable(SSI2_BASE);

    SSIIntEnable(SSI2_BASE,SSI_RXFF);

    //
    // Read any residual data from the SSI port.  This makes sure the receive
    // FIFOs are empty, so we don't read any unwanted junk.  This is done here
    // because the TI SSI mode is full-duplex, which allows you to send and
    // receive at the same time.  The SSIDataGetNonBlocking function returns
    // "true" when data was returned, and "false" when no data was returned.
    // The "non-blocking" function checks if there is any data in the receive
    // FIFO and does not "hang" if there isn't.
    //
    while(SSIDataGetNonBlocking(SSI2_BASE, &pui32DataRx[0]))
    {
    }
}

//*****************************************************************************
//
// Interrupt handler for SSI2 peripheral in slave mode.  It reads the interrupt
// status and if the interrupt is fired by a RX time out interrupt it reads the
// SSI2 RX FIFO and increments a counter to tell the main loop that RX timeout
// interrupt was fired.
//
//*****************************************************************************
void SSI2IntHandler(void)
{
    uint32_t ulStatus, ui32Index;

        //
        // Read interrupt status.
        //
        ulStatus = SSIIntStatus(SSI2_BASE, 1);

        //
        // Check the reason for the interrupt.
        //
        if((ulStatus & SSI_RXFF) == SSI_RXFF)
        {
            //
            // Clear the interrupt
            //
            SSIIntClear(SSI2_BASE, SSI_RXFF);

            //
            // Receive First byte from SSI2 Bus
            //
            SSIDataGetNonBlocking(SSI2_BASE, &pui32DataRx[g_ui32Index++]);


            //
            // Check first byte is valid or not
            //
            if(pui32DataRx[0] == g_ui32ExpectedFIFOData)
            {

                //
                // Receive the data using the "blocking" Get function. This function
                // will wait until there is data in the receive FIFO before returning.
                while(SSIDataGetNonBlocking(SSI2_BASE, &pui32DataRx[g_ui32Index++]));

                //
                // Wait until SSI2 is done receiving all the data in the receive FIFO.
                //
                while(SSIBusy(SSI2_BASE));

                //
                // Receive flag indicates the reception is completed
                //
                g_ulSSI2RXFF++;
                g_ui32Index--;

            }


            else
            {
                while(SSIDataGetNonBlocking(SSI2_BASE, &ulDataRx0[0]))
                {
                }

                g_ui32Index = 0;
            }
        }

        // Clear interrupts.
        //
        SSIIntClear(SSI2_BASE, ulStatus);

}

//*****************************************************************************
//
// This function is used to send multiple bytes of data over SSI2 bus
//
//*****************************************************************************
void
Send (uint32_t ulDataTx0[])
{
    uint32_t ui32Index;

    //
    // Transmit 10 bytes of  data over SSI2 Bus
    //
    for(ui32Index = 0; ui32Index < NUM_SSI_DATA; ui32Index++)
    {
        //
        // Load transmitted data into transmitted FIFO
        //
        pui32DataTx[ui32Index] = ulDataTx0[ui32Index];

        //
        // Send the data using the "blocking" put function.  This function
        // will wait until there is room in the send FIFO before returning.
        // This allows you to assure that all the data you send makes it into
        // the send FIFO.
        //
        SSIDataPutNonBlocking(SSI2_BASE, pui32DataTx[ui32Index]);

        UARTprintf("pui32DataTx[%d] = %d\n",ui32Index,pui32DataTx[ui32Index]);

    }

    //
    // Wait until SSI2 is done transferring all the data in the transmit FIFO.
    //
    while(SSIBusy(SSI2_BASE))
    {
    }

    UARTprintf("SPI Master Transmission is Done....\n\n");


}


//*****************************************************************************
//
// This function is used to receive the multiple bytes of data and prints on to
// the console screen
//
//*****************************************************************************
void
Ask (void)
{
    uint32_t count = 0;

    if(g_ulSSI2RXFF)
    {
        if (pui32DataRx[49] == 60)
        {
            for(count = 0; count < NUM_SSI_DATA; count++)
            {
               // ui32DataRx1[count]  = pui32DataRx[count];

                //
                // Display the data that SSI2 received.
                //
                UARTprintf("pui32DataRx[%d] = %d \n", count,pui32DataRx[count]);

            }

            UARTprintf("SPI Master Receiving is Done....\n\n");

            g_ui32Index = 0;
            g_ui32ExpectedFIFOData = 11;
        }
        g_ulSSI2RXFF = 0;
    }



}


//*****************************************************************************
//
// Main function entry starts here
//
//*****************************************************************************
int
main(void)
{
    //
    // Set the clocking to run directly from the external crystal/oscillator.
    // TODO: The SYSCTL_XTAL_ value must be changed to match the value of the
    // crystal on your board.
    //

    SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
            SYSCTL_XTAL_16MHZ);


    //
    // Set up the serial console to use for displaying messages.  This is
    // just for this example program and is not needed for SSI operation.
    //
    InitConsole();
    //
    // Display the setup on the console.
    //
    UARTprintf("SSI ->\n");
    UARTprintf("  Mode: TI\n");
    UARTprintf("  Data: 8-bit\n\n");

    for(count = 0; count < NUM_SSI_DATA; count++)
    {
        ulDataTx0[count] = count + 1;
    }

    InitSSI2();
    IntEnable(INT_SSI2);
    IntMasterEnable();


    while(1)
    {


        Send(ulDataTx0);
        SysCtlDelay(200000);
        Ask();


    }

}