path: root/Software/Embedded_SW/Embedded/Drivers/ADC_Sampling/ADC.c

//*****************************************************************************
//
// This is the data acquisition module.  It performs acquisition of data from
// selected channels, starting and stopping data logging, storing acquired
// data, and running the strip chart display.
//
//*****************************************************************************
/*
Notes:
    12 shared analog input channels
    12-bit precision ADC
    Hardware averaging of up to 64 samples
    As referred before the ADC has a  reference of 3V.

    Voltage reference selected using the VREF field in the ADCCTL register (page 1217)

    J0062
            PIN 21  - AN_IDS_PRESSENS_7
            PIN 9   - GND

    J0252
            PIN 21  - AN_IDS_PRESSENS_1
            PIN 9   - GND

    J0042
            PIN 21  - AN_IDS_PRESSENS_3
            PIN 9   - GND


-----------------
void ADCAcquireInit(void) // (MillisecInit) ok

void ADCAcquireStart(ProcessCallback _callback, uint32_t _period)// (called by MillisecStart)

//reading Trigger
uint32_t ADC_TriggerCollection(void) // MillisecLoop
//Data Get
void ADC0SS0Handler(void)


//----------------------------------------------------


uint32_t ADC_GetReading(int DataItemId)// ADC Data get for a single data read

Void ADCProcessTask(UArg arg0, UArg arg1)

void ADCAcquireStop(void) //MillisecStop

//---------------------------------


        for (adc_i = 0; adc_i < MAX_ADC_DEVICES ; adc_i++)
            ADC_Data[adc_i] = ADC_GetReading(adc_i);
*/

#include "ADC.h"
#include "include.h"
#include <stdbool.h>

#include <ti/sysbios/BIOS.h>
#include <ti/sysbios/knl/Clock.h>
#include <ti/sysbios/knl/Semaphore.h>

#include <driverlib/adc.h>
#include <driverlib/rom_map.h>
#include <driverlib/interrupt.h>

#include <inc/hw_memmap.h>
#include <inc/hw_ints.h>
#include "Drivers/I2C_Communication/I2C.h"

//*****************************************************************************
//
// The following defines which ADC channel control should be used for each
// kind of data item.  Basically it maps how the ADC channels are connected
// on the board.  This is a hardware pinmap configuration.
// Physical ADC connected channels in the TIVA
//*****************************************************************************

#define CHAN_AIR_PRESSURE_1        ADC_CTL_CH0
#define CHAN_AIR_PRESSURE_2        ADC_CTL_CH1
#define CHAN_DISPENSE_PRESSURE_1   ADC_CTL_CH2
#define CHAN_DISPENSE_PRESSURE_2   ADC_CTL_CH3
#define CHAN_DISPENSE_PRESSURE_3   ADC_CTL_CH4
#define CHAN_DISPENSE_PRESSURE_4   ADC_CTL_CH5
#define CHAN_DISPENSE_PRESSURE_5   ADC_CTL_CH6
#define CHAN_DISPENSE_PRESSURE_6   ADC_CTL_CH7
#define CHAN_DISPENSE_PRESSURE_7   ADC_CTL_CH8
#define CHAN_DISPENSE_PRESSURE_8   ADC_CTL_CH9
#define CHAN_LEFT_DANCER_1         ADC_CTL_CH13
#define CHAN_LEFT_DANCER_2         ADC_CTL_CH14
#define CHAN_RIGHT_DANCER          ADC_CTL_CH15
#define CHAN_DRYER_CURRENT_1       ADC_CTL_CH16
#define CHAN_DRYER_CURRENT_2       ADC_CTL_CH17
#define CHAN_DRYER_CURRENT_3       ADC_CTL_CH18

//*****************************************************************************
//
// The following maps the order that items are acquired and stored by the
// ADC sequencers.  Note that 16 samples are specified, using 2 of the
// 8 sample sequencers.  The current is sampled multiple times deliberately
// because that value tends to bounce around.  It is sampled multiple
// times and will be averaged.
//
//*****************************************************************************
uint32_t g_pui32ADCSeq[] =
{
 CHAN_AIR_PRESSURE_1,CHAN_AIR_PRESSURE_2,
 CHAN_DISPENSE_PRESSURE_1, CHAN_DISPENSE_PRESSURE_2, CHAN_DISPENSE_PRESSURE_3, CHAN_DISPENSE_PRESSURE_4,
 CHAN_DISPENSE_PRESSURE_5, CHAN_DISPENSE_PRESSURE_6, CHAN_DISPENSE_PRESSURE_7, CHAN_DISPENSE_PRESSURE_8,
 CHAN_LEFT_DANCER_1, CHAN_LEFT_DANCER_2, CHAN_RIGHT_DANCER,
 CHAN_DRYER_CURRENT_1, CHAN_DRYER_CURRENT_2, CHAN_DRYER_CURRENT_3
};

#define NUM_ADC_CHANNELS        (sizeof(g_pui32ADCSeq) /                      \
                                 sizeof(g_pui32ADCSeq[0]))

//#define SAMPLE_ARRAY_SIZE (NUM_ADC_CHANNELS + I2C_NUM_OF_CHANNELS)
#define SAMPLE_ARRAY_SIZE NUM_ADC_CHANNELS
#define DOUBLE_BUFFER 2

static bool isInitialized = false;
static bool adcCollectActive = false;
static int bufferFlipFlop = 0;

//*****************************************************************************
//
// Global _storage for most recent sampaled Sensor Data
//
//*****************************************************************************
//
// A buffer to hold one set of ADC data that is acquired per sample time.
//
//*****************************************************************************
static uint32_t g_pui32ADCData[DOUBLE_BUFFER][SAMPLE_ARRAY_SIZE];

//*****************************************************************************
//configured in the cfg file and thats why should be defined as extern
//*****************************************************************************
extern Semaphore_Handle adcResultSem;

static ProcessCallback processCallBack;

//*****************************************************************************
// ADCClockHandle: clock event handler - initiates trigger for the adc sampaling
//*****************************************************************************
// This function starts an ADC Conversion.
//static void ADCClockHandle(UArg arg0)
uint32_t ADC_TriggerCollection(void) // (called by MillisecLoop)
{
    //
    // Kick off the next ADC acquisition.  When these are done they will
    // cause an ADC interrupt.
    //
    if (adcCollectActive == true)
    {
        MAP_ADCProcessorTrigger(ADC1_BASE, 0);
        MAP_ADCProcessorTrigger(ADC0_BASE, 0);
    }
    return 0;
}
//*****************************************************************************
//
// ADC Data get for a single data read
//
//*****************************************************************************
uint32_t ADC_GetReading(int DataItemId) //  // ADC Data get for a single data read
{
    int bufnotinuse;
    assert (DataItemId<MAX_ADC_DEVICES);

    if (bufferFlipFlop == 0)  bufnotinuse = 1;
    else  bufnotinuse = 0;
    return (g_pui32ADCData[bufnotinuse][DataItemId]);


}

//*****************************************************************************
//
// This is the handler for the ADC interrupt.  Even though more than one
// sequencer is used, they are configured so that this one runs last.
// Therefor when this ADC sequencer interrupt occurs, we know all of the ADC
// data has been acquired.
//
//*****************************************************************************
void ADC0SS0Handler(void)
{
    //
    // Clear the interrupts for all ADC sequencers that are used.
    //
    MAP_ADCIntClear(ADC0_BASE, 0);
    MAP_ADCIntClear(ADC1_BASE, 0);

    if (bufferFlipFlop == 0)  bufferFlipFlop = 1;
    else  bufferFlipFlop = 0;
    //
    // Retrieve the data from all ADC sequencers
    //
    MAP_ADCSequenceDataGet(ADC0_BASE, 0, &g_pui32ADCData[bufferFlipFlop][0]);
    //offset in the array calculated as sampling of 16 channels each one of 16 bits
    MAP_ADCSequenceDataGet(ADC1_BASE, 0, &g_pui32ADCData[bufferFlipFlop][8]);

    //
    // Release adc result semaphore
    //
    //the ADC Process task is mot currently active. the results will be copied to a second buffer and supplied upon request
	//Semaphore_post(adcResultSem);
}

//*****************************************************************************
//
//*****************************************************************************
Void ADCProcessTask(UArg arg0, UArg arg1)
{
	while(1)
	{
		//
		// Wait until new ADC data is available
		//
		Semaphore_pend(adcResultSem, BIOS_WAIT_FOREVER);

		//
		// Process the ADC data
		//
		if (processCallBack != NULL)
		{
			processCallBack(g_pui32ADCData[bufferFlipFlop]);
		}
	}
}

//*****************************************************************************
//
// This function initializes the ADC hardware in preparation for data
// acquisition.
//
//*****************************************************************************
void ADCAcquireInit(void) // (called by MillisecInit)
{
    uint32_t ui32Chan, ui32Base, ui32Seq;

    //Avaraging 8
    //MAP_ADCHardwareOversampleConfigure(ADC0_BASE, 8);
    //MAP_ADCHardwareOversampleConfigure(ADC1_BASE, 8);
    //
    // Initialize both ADC peripherals using sequencer 0 and processor trigger.
    //
    MAP_ADCSequenceConfigure(ADC0_BASE, 0, ADC_TRIGGER_PROCESSOR, 0);
    MAP_ADCSequenceConfigure(ADC1_BASE, 0, ADC_TRIGGER_PROCESSOR, 0);


    //
    // Enter loop to configure all of the ADC sequencer steps needed to
    // acquire the data for the data logger.  Multiple ADC and sequencers
    // will be used in order to acquire all the channels.
    //
    for(ui32Chan = 0; ui32Chan < NUM_ADC_CHANNELS; ui32Chan++)
    {
        //
        // If this is the first ADC then set the base for ADC0
        //
        if(ui32Chan < 8)
        {
            ui32Base = ADC0_BASE;
            ui32Seq = 0;
        }
        else if(ui32Chan < 16)
        {
            //
            // Second ADC, set the base for ADC1
            //
            ui32Base = ADC1_BASE;
            ui32Seq = 0;
        }

        //
        // Get the channel control for each channel.  Test to see if it is the
        // last channel for the sequencer, and if so then also set the
        // interrupt and "end" flags.
        //
        uint32_t ui32ChCtl = g_pui32ADCSeq[ui32Chan];
        //TODO define all the numbers under #define and not here
        if((ui32Chan == 7) || (ui32Chan == 15) || (ui32Chan == (NUM_ADC_CHANNELS - 1)))
        {
            ui32ChCtl |= ADC_CTL_IE | ADC_CTL_END;
        }

        //
        // Configure the sequence step
        //
        MAP_ADCSequenceStepConfigure(ui32Base, ui32Seq, ui32Chan % 8, ui32ChCtl);
    }

    ADCReferenceSet(ADC0_BASE, ADC_REF_EXT_3V);
    ADCReferenceSet(ADC1_BASE, ADC_REF_EXT_3V);

    if (!isInitialized)
    {
		// Create a periodic Clock Instance with _period - triggers the ADC sampling
		isInitialized = true;

		//InitI2C();
    }
}

//*****************************************************************************
//
// This function is called to start an acquisition running.  It determines
// which channels are to be logged, enables the ADC/I2C sequencers.
// This will start the acquisition running.
//
//*****************************************************************************
void ADCAcquireStart(ProcessCallback _callback, uint32_t _period) // (called by MillisecStart)
{
    //
    // Enable the ADC sequencers
    //
    MAP_ADCSequenceEnable(ADC0_BASE, 0);
    MAP_ADCSequenceEnable(ADC1_BASE, 0);

    //
    // Flush the ADC sequencers to be sure there is no lingering/ trush data.
    //
    MAP_ADCSequenceDataGet(ADC0_BASE, 0, g_pui32ADCData[0]);
    MAP_ADCSequenceDataGet(ADC1_BASE, 0, g_pui32ADCData[0]);

    //
    // Enable ADC interrupts
    //
    MAP_ADCIntClear(ADC0_BASE, 0);
    MAP_ADCIntClear(ADC1_BASE, 0);
    MAP_ADCIntEnable(ADC0_BASE, 0);
    ROM_IntEnable(INT_ADC0SS0);

    // Store process
    processCallBack = _callback;
    // Start a periodic Clock Instance with _period - triggers the ADC sampling
    adcCollectActive = true;
    //
    // Logging data should now start running
    //
}

//*****************************************************************************
//
// This function is called to stop an acquisition running.  It disables the
// ADC sequencers.
//
//*****************************************************************************
void ADCAcquireStop(void)
{
	//Stop trigger adc sampling
	adcCollectActive = false;
    //
    // Disable ADC interrupts
    //
    MAP_IntDisable(INT_ADC0SS0);
    MAP_IntDisable(INT_ADC1SS0);

    //
    // Disable ADC sequencers
    //
    MAP_ADCSequenceDisable(ADC0_BASE, 0);
    MAP_ADCSequenceDisable(ADC1_BASE, 0);
}