ADCBufCC26XX.h

Go to the documentation of this file.

/*
 * Copyright (c) 2015-2019, Texas Instruments Incorporated
 * 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 following disclaimer.
 *
 * *  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * *  Neither the name of Texas Instruments Incorporated nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS 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       ADCBufCC26XX.h
 *
 *  @brief      ADCBuf driver implementation for a CC26XX analog-to-digital converter
 *
 * # Driver include #
 *  The ADCBuf header file should be included in an application as follows:
 *  @code
 *  #include <ti/drivers/ADCBuf.h>
 *  #include <ti/drivers/adc/ADCBufCC26XX.h>
 *  @endcode
 *
 * # Overview #
 * This is a CC26XX specific implementation of the generic TI-RTOS ADCBuf driver.
 * The generic ADCBuf API specified in ti/drivers/ADCBuf.h should be called by the application,
 * not the device specific implementation in ti/drivers/adcbuf/ADCBufCC26XX.
 * The board file defines the device specific configuration and casting in the general
 * API ensures the correct device specific functions are called. You should specify an
 * ADCBufCC26XX_ParamsExtension in the custom field of the ADCBuf_Params that suits
 * your application. The default settings work for many, but not all, usecases.
 *
 * # General Behavior #
 * A timer and the DMA are used to trigger the ADC and fill a buffer in the background (in hardware) at a specified frequency.
 * The application may execute other tasks while the hardware handles the conversions.
 * In contrast to the standard ti/drivers/ADC driver, this driver allows for precise sampling of waveforms.
 *
 * | Driver         | Number of samples needed in one call    |
 * |----------------|-----------------------------------------|
 * | ADC.h          | 1                                       |
 * | ADCBuf.h       | > 1                                     |
 *
 * This ADCBuf driver provides an API interface to using the analog-to-digital converter
 * directly from the CM3 without going through the sensor controller.
 * The sensor controller can still use the ADC, support for sharing the ADC resource between the
 * sensor controller and the CM3 is built into the driver. There is a hardware semaphore that the
 * driver must acquire before beginning any number of conversions. This same hardware semaphore also
 * prevents the simultaneous use of this driver and the basic ADC driver.
 *
 * The ADC drivers supports making between one and 1024 measurements once or continuous
 * measuring with returned buffer sizes between one and 1024 measurements.
 *
 * The application should call ADCBuf_init() once by the application to set the isOpened
 * flag to false, indicating that the driver is ready to use.
 *
 * The ADC driver is opened by calling ADCBuf_open() which will
 * set up interrupts and configure the internal components of the driver.
 * However, the ADC hardware or analog pins are not yet configured, since the sensor
 * controller or basic ADC driver might be using the ADC.
 *
 * In order to perform an ADC conversion, the application should call
 * ADCBuf_convert(). This call will request the ADC resource, configure the ADC, set up the DMA and GPTimer,
 * and perform the requested ADC conversions on the selected DIO or internal signal. The DIO or internal signal is defined by the
 * ADCBuf_Conversion structure in the application code and adcBufCC26xxObjects in the board file.
 *
 * @warning If the ADCBUF driver is setup in ADCBuf_RECURRENCE_MODE_CONTINUOUS mode, the user must assure that the provided callback
 *          function is completed before the next conversion completes. If the next conversion completes before the callback function finishes,
 *          the DMA will clobber the previous buffer with new data.
 *
 * If the sensor controller is using the ADC when the driver requests it at the start of the ADC_convert() call,
 * the conversion will fail and return false.
 * The ADC resource may be pre-acquired by calling the control function ADCBufCC26XX_CMD_ACQUIRE_ADC_SEMAPHORE.
 * It will be released again automatically after the next conversion completes.
 *
 * In both ADCBufCC26XX_SAMPING_MODE_SYNCHRONOUS mode and ADCBufCC26XX_SAMPING_MODE_ASYNCHRONOUS mode, enough sampling
 * time must be provided between conversions that each measurement may be completed before the next trigger arrives.
 *
 * @note    The ADCBuf driver requires GPTimer0A to function correctly. It expects it to be configured as position 0 in the GPTimer Config Table.
 *          GPTimer0A will be unavailable for other uses.
 *
 * # Supported ADC pins #
 * Below is a table of the supported ADC IO pins for each package size, for both CC26xx and CC13xx.
 * It maps a DIO to its corresponding driverlib define for the CompBInput that it is hardwired to.
 * This table can be used to create virtual channel entries in the ADCBufCC26XX_adcChannelLut table in the board file.
 *
 * | DIO    | CC26xx 7x7 AUXIO CompBInput   | CC13xx 7x7 AUXIO CompBInput   | CC26xx 5x5 AUXIO CompBInput   | CC13xx 5x5 AUXIO CompBInput   | CC26xx 4x4 AUXIO CompBInput   | CC13xx 4x4 AUXIO CompBInput
 * |--------|-------------------------------|-------------------------------|-------------------------------|-------------------------------|-------------------------------|-----------------------------
 * | 0      | No                            | No                            | No                            | No                            | No                            | No
 * | 1      | No                            | No                            | No                            | No                            | No                            | No
 * | 2      | No                            | No                            | No                            | No                            | No                            | No
 * | 3      | No                            | No                            | No                            | No                            | No                            | No
 * | 4      | No                            | No                            | No                            | No                            | No                            | No
 * | 5      | No                            | No                            | No                            | No                            | ADC_COMPB_IN_AUXIO7           | ADC_COMPB_IN_AUXIO7
 * | 6      | No                            | No                            | No                            | No                            | ADC_COMPB_IN_AUXIO6           | ADC_COMPB_IN_AUXIO6
 * | 7      | No                            | No                            | ADC_COMPB_IN_AUXIO7           | ADC_COMPB_IN_AUXIO7           | ADC_COMPB_IN_AUXIO5           | ADC_COMPB_IN_AUXIO5
 * | 8      | No                            | No                            | ADC_COMPB_IN_AUXIO6           | ADC_COMPB_IN_AUXIO6           | ADC_COMPB_IN_AUXIO4           | ADC_COMPB_IN_AUXIO4
 * | 9      | No                            | No                            | ADC_COMPB_IN_AUXIO4           | ADC_COMPB_IN_AUXIO4           | ADC_COMPB_IN_AUXIO3           | ADC_COMPB_IN_AUXIO3
 * | 10     | No                            | No                            | ADC_COMPB_IN_AUXIO5           | ADC_COMPB_IN_AUXIO5           | No                            | No
 * | 11     | No                            | No                            | ADC_COMPB_IN_AUXIO3           | ADC_COMPB_IN_AUXIO3           | No                            | No
 * | 12     | No                            | No                            | ADC_COMPB_IN_AUXIO2           | ADC_COMPB_IN_AUXIO2           | No                            | No
 * | 13     | No                            | No                            | ADC_COMPB_IN_AUXIO1           | ADC_COMPB_IN_AUXIO1           | No                            | No
 * | 14     | No                            | No                            | ADC_COMPB_IN_AUXIO0           | ADC_COMPB_IN_AUXIO0           | No                            | No
 * | 15-22  | No                            | No                            | No                            | No                            | No                            | No
 * | 23     | ADC_COMPB_IN_AUXIO7           | ADC_COMPB_IN_AUXIO7           | No                            | No                            | No                            | No
 * | 24     | ADC_COMPB_IN_AUXIO6           | ADC_COMPB_IN_AUXIO6           | No                            | No                            | No                            | No
 * | 25     | ADC_COMPB_IN_AUXIO5           | ADC_COMPB_IN_AUXIO5           | No                            | No                            | No                            | No
 * | 26     | ADC_COMPB_IN_AUXIO4           | ADC_COMPB_IN_AUXIO4           | No                            | No                            | No                            | No
 * | 27     | ADC_COMPB_IN_AUXIO3           | ADC_COMPB_IN_AUXIO3           | No                            | No                            | No                            | No
 * | 28     | ADC_COMPB_IN_AUXIO2           | ADC_COMPB_IN_AUXIO2           | No                            | No                            | No                            | No
 * | 29     | ADC_COMPB_IN_AUXIO1           | ADC_COMPB_IN_AUXIO1           | No                            | No                            | No                            | No
 * | 30     | ADC_COMPB_IN_AUXIO0           | ADC_COMPB_IN_AUXIO0           | No                            | No                            | No                            | No
 *
 * # Supported Internal Signals #
 * Below is a table of internal signals that can be measured using the ADC.
 * Since we are not connecting to a DIO, there is no DIO to internal signal mapping. The DIO field in the channel lookup table should be marked PIN_UNASSIGNED.
 * This table can be used to create virtual channel entries in the ADCBufCC26XX_adcChannelLut table in the board file.
 *
 * | DIO                | Internal Signal CompBInput    |
 * |--------------------|-------------------------------|
 * | PIN_UNASSIGNED     | ADC_COMPB_IN_DCOUPL           |
 * | PIN_UNASSIGNED     | ADC_COMPB_IN_VSS              |
 * | PIN_UNASSIGNED     | ADC_COMPB_IN_VDDS             |
 *
 * # Error handling #
 * The following errors may occur when opening the ADC without assertions enabled:
 * - The ADC handle is already open.
 *
 * The following errors may occur when requesting an ADC conversion:
 * - The ADC is currently already doing a conversion.
 * - The ADC was not available (used by sensor controller or basic ADC).
 *
 *
 * # Power Management #
 * The TI-RTOS power management framework will try to put the device into the most
 * power efficient mode whenever possible. Please see the technical reference
 * manual for further details on each power mode.
 *
 * While converting, the ADCBufCC26XX driver sets a power constraint to keep
 * the device out of standby. When the conversion has finished, the power
 * constraint is released. The driver also sets a dependency on the DMA to enable
 * background transfers from the ADC FIFO to memory and to clear the GPTimer interrupt.
 * The following statements are valid:
 *      - After ADCBuf_convert(): the device cannot enter standby.
 *      - After ADCBuf_convertCancel(): the device can enter standby again.
 *      - After a conversion finishes: the device can enter standby again.
 *
 *
 * # Supported Functions #
 * | API function                       | Description                                                           |
 * |------------------------------------|-----------------------------------------------------------------------|
 * | ADCBuf_init()                      | Initialize ADC driver                                                 |
 * | ADCBuf_open()                      | Open the ADC driver and configure driver                              |
 * | ADCBuf_convert()                   | Perform ADC conversion                                                |
 * | ADCBuf_convertCancel()             | Cancel ongoing ADC conversion                                         |
 * | ADCBuf_close()                     | Close ADC driver                                                      |
 * | ADCBuf_Params_init()               | Initialise ADCBuf_Params structure to default values                  |
 * | ADCBuf_getResolution()             | Get the resolution of the ADC of the current device                   |
 * | ADCBuf_adjustRawValues()           | Adjust the values in a returned buffer for manufacturing tolerances   |
 * | ADCBuf_convertAdjustedToMicroVolts | Convert a buffer of adjusted values to microvolts                     |
 * | ADCBuf_control()                   | Execute device specific functions                                     |
 *
 *
 *  # Not Supported Functionality #
 *     - Performing conversions on multiple channels simultaneously is not supported.
 *       In other words, the parameter channelCount must always be set to 1 when calling ADCBuf_convert().
 *       The ADC on CC26XX devices does not support time-division multiplexing of channels or pins in hardware.
 *
 * # Use Cases #
 * ## Basic one-shot conversion #
 *  Perform one conversion on Board_ADCCHANNEL_A1 in ::ADCBuf_RETURN_MODE_BLOCKING.
 *  @code
 *      #include <ti/drivers/ADCBuf.h>
 *
 *      #define ADCBUFFERSIZE   100
 *
 *      ADCBuf_Handle adcBufHandle;
 *      ADCBuf_Params adcBufParams;
 *      ADCBuf_Conversion blockingConversion;
 *      uint16_t sampleBufferOne[ADCBUFFERSIZE];
 *
 *      ADCBuf_Params_init(&adcBufParams);
 *      adcBufHandle = ADCBuf_open(Board_ADCBuf0, &adcBufParams);
 *      if (adcBufHandle == NULL) {
 *          // handle error
 *      }
 *
 *      blockingConversion.arg = NULL;
 *      blockingConversion.adcChannel = Board_ADCCHANNEL_A1;
 *      blockingConversion.sampleBuffer = sampleBufferOne;
 *      blockingConversion.sampleBufferTwo = NULL;
 *      blockingConversion.samplesRequestedCount = ADCBUFFERSIZE;
 *
 *      if (ADCBuf_convert(adcBufHandle, &blockingConversion, 1) != ADCBuf_STATUS_SUCCESS) {
 *          // handle error
 *      }
 *  @endcode
 *
 * ## Using ADCBufCC26XX_ParamsExtension #
 *  This specific configuration performs one conversion on Board_ADCCHANNEL_A1 in ::ADCBuf_RETURN_MODE_BLOCKING.
 *  The custom parameters used here are identical to the defaults parameters.
 *  Users can of course define their own parameters.
 *  @code
 *      #include <ti/drivers/ADCBuf.h>
 *
 *      #define ADCBUFFERSIZE   100
 *
 *      ADCBuf_Handle adcBufHandle;
 *      ADCBuf_Params adcBufParams;
 *      ADCBuf_Conversion blockingConversion;
 *      uint16_t sampleBufferOne[ADCBUFFERSIZE];
 *      ADCBufCC26XX_ParamsExtension customParams;
 *
 *      ADCBuf_Params_init(&adcBufParams);
 *      customParams.samplingDuration    = ADCBufCC26XX_SAMPLING_DURATION_2P7_US;
 *      customParams.refSource           = ADCBufCC26XX_FIXED_REFERENCE;
 *      customParams.samplingMode        = ADCBufCC26XX_SAMPING_MODE_SYNCHRONOUS;
 *      customParams.inputScalingEnabled = true;
 *
 *      adcBufParams.custom = &customParams;
 *
 *      adcBufHandle = ADCBuf_open(Board_ADCBuf0, &adcBufParams);
 *      if (adcBufHandle == NULL) {
 *          // handle error
 *      }
 *
 *      blockingConversion.arg = NULL;
 *      blockingConversion.adcChannel = Board_ADCCHANNEL_A1;
 *      blockingConversion.sampleBuffer = sampleBufferOne;
 *      blockingConversion.sampleBufferTwo = NULL;
 *      blockingConversion.samplesRequestedCount = ADCBUFFERSIZE;
 *
 *      if (ADCBuf_convert(adcBufHandle, &blockingConversion, 1) != ADCBuf_STATUS_SUCCESS) {
 *          // handle error
 *      }
 *  @endcode
 *
 *  # Instrumentation #
 *  The ADC driver interface produces log statements if instrumentation is
 *  enabled.
 *
 *  Diagnostics Mask | Log details                          |
 *  ---------------- | -----------                          |
 *  Diags_USER1      | basic ADCBuf operations performed    |
 *  Diags_USER2      | detailed ADCBuf operations performed |
 *
 ******************************************************************************
 */

#ifndef ti_drivers_adc_adcbufcc26xx__include
#define ti_drivers_adc_adcbufcc26xx__include

#ifdef __cplusplus
extern "C" {
#endif

#include <stdint.h>
#include <stdbool.h>

#include <ti/drivers/ADCBuf.h>
#include <ti/drivers/PIN.h>
#include <ti/drivers/pin/PINCC26XX.h>
#include <ti/drivers/dma/UDMACC26XX.h>
#include <ti/drivers/timer/GPTimerCC26XX.h>
#include <ti/drivers/Power.h>
#include <ti/drivers/power/PowerCC26XX.h>

#include <ti/devices/DeviceFamily.h>
#include DeviceFamily_constructPath(driverlib/aux_adc.h)

#include <ti/drivers/dpl/HwiP.h>
#include <ti/drivers/dpl/ClockP.h>
#include <ti/drivers/dpl/SemaphoreP.h>
#include <ti/drivers/dpl/SwiP.h>

/* Add ADCBufCC26XX_CMD_* macros here */

#define ADCBufCC26XX_CMD_ACQUIRE_ADC_SEMAPHORE ADCBuf_CMD_RESERVED + 1

#define ADCBufCC26XX_CMD_KEEP_ADC_SEMAPHORE ADCBuf_CMD_RESERVED + 2

#define ADCBufCC26XX_CMD_KEEP_ADC_SEMAPHORE_DISABLE ADCBuf_CMD_RESERVED + 3

#define ADCBufCC26XX_CMD_RELEASE_ADC_SEMAPHORE ADCBuf_CMD_RESERVED + 4

#define ADCBufCC26XX_RESOLUTION            12

#define ADCBufCC26XX_BYTES_PER_SAMPLE      2

/*
 * =============================================================================
 * Constants
 * =============================================================================
 */

/* ADCBuf function table pointer */
extern const ADCBuf_FxnTable ADCBufCC26XX_fxnTable;


/*
 * =============================================================================
 * Enumerations
 * =============================================================================
 */

typedef enum ADCBufCC26XX_Sampling_Mode {
    ADCBufCC26XX_SAMPING_MODE_SYNCHRONOUS,
    ADCBufCC26XX_SAMPING_MODE_ASYNCHRONOUS
} ADCBufCC26XX_Sampling_Mode;

typedef enum ADCBufCC26XX_Sampling_Duration {
    ADCBufCC26XX_SAMPLING_DURATION_2P7_US    = AUXADC_SAMPLE_TIME_2P7_US,
    ADCBufCC26XX_SAMPLING_DURATION_5P3_US    = AUXADC_SAMPLE_TIME_5P3_US,
    ADCBufCC26XX_SAMPLING_DURATION_10P6_US   = AUXADC_SAMPLE_TIME_10P6_US,
    ADCBufCC26XX_SAMPLING_DURATION_21P3_US   = AUXADC_SAMPLE_TIME_21P3_US,
    ADCBufCC26XX_SAMPLING_DURATION_42P6_US   = AUXADC_SAMPLE_TIME_42P6_US,
    ADCBufCC26XX_SAMPLING_DURATION_85P3_US   = AUXADC_SAMPLE_TIME_85P3_US,
    ADCBufCC26XX_SAMPLING_DURATION_170_US    = AUXADC_SAMPLE_TIME_170_US,
    ADCBufCC26XX_SAMPLING_DURATION_341_US    = AUXADC_SAMPLE_TIME_341_US,
    ADCBufCC26XX_SAMPLING_DURATION_682_US    = AUXADC_SAMPLE_TIME_682_US,
    ADCBufCC26XX_SAMPLING_DURATION_1P37_MS   = AUXADC_SAMPLE_TIME_1P37_MS,
    ADCBufCC26XX_SAMPLING_DURATION_2P73_MS   = AUXADC_SAMPLE_TIME_2P73_MS,
    ADCBufCC26XX_SAMPLING_DURATION_5P46_MS   = AUXADC_SAMPLE_TIME_5P46_MS,
    ADCBufCC26XX_SAMPLING_DURATION_10P9_MS   = AUXADC_SAMPLE_TIME_10P9_MS
} ADCBufCC26XX_Sampling_Duration;


typedef enum ADCBufCC26XX_Reference_Source {
    ADCBufCC26XX_FIXED_REFERENCE       = AUXADC_REF_FIXED,
    ADCBufCC26XX_VDDS_REFERENCE        = AUXADC_REF_VDDS_REL
} ADCBufCC26XX_Reference_Source;



/*
 * =============================================================================
 * Structs
 * =============================================================================
 */

typedef struct ADCBufCC26XX_AdcChannelLutEntry{
    uint8_t dio;            
    uint8_t compBInput;     
} ADCBufCC26XX_AdcChannelLutEntry;

typedef struct ADCBufCC26XX_ParamsExtension{
    ADCBufCC26XX_Sampling_Duration     samplingDuration;
    ADCBufCC26XX_Sampling_Mode         samplingMode;
    ADCBufCC26XX_Reference_Source      refSource;
    bool                                inputScalingEnabled;
} ADCBufCC26XX_ParamsExtension;

typedef struct ADCBufCC26XX_HWAttrs{
    uint32_t            swiPriority;
    uint8_t             intPriority;
    ADCBufCC26XX_AdcChannelLutEntry  const *adcChannelLut;
} ADCBufCC26XX_HWAttrs;



typedef struct ADCBufCC26XX_Object{
    /* ADC control variables */
    bool                            isOpen;                     
    bool                            conversionInProgress;       
    bool                            inputScalingEnabled;        
    bool                            keepADCSemaphore;           
    bool                            adcSemaphoreInPossession;   
    uint8_t                         currentChannel;             
    ADCBufCC26XX_Reference_Source   refSource;                  
    ADCBufCC26XX_Sampling_Mode      samplingMode;               
   ADCBufCC26XX_Sampling_Duration   samplingDuration;           
    ADCBuf_Callback                 callbackFxn;                
    ADCBuf_Recurrence_Mode          recurrenceMode;             
    ADCBuf_Return_Mode              returnMode;                 
    uint16_t                        *activeSampleBuffer;        
    /* ADC SYS/BIOS objects */
    HwiP_Struct                      hwi;                        
    SwiP_Struct                      swi;                        
    SemaphoreP_Struct                conversionComplete;         
    ADCBuf_Conversion               *currentConversion;         
    /* PIN driver state object and handle */
    PIN_State                       pinState;                   
    PIN_Handle                      pinHandle;                  
    /* UDMA driver handle */
    UDMACC26XX_Handle               udmaHandle;                 
    /* GPTimer driver handle */
    GPTimerCC26XX_Handle            timerHandle;                
    uint32_t                        semaphoreTimeout;           
    uint32_t                        samplingFrequency;          
} ADCBufCC26XX_Object, *ADCBufCC26XX_Handle;

/*
 * =============================================================================
 * Functions
 * =============================================================================
 */


#ifdef __cplusplus
}
#endif

#endif /* ti_drivers_adc_ADCBufCC26XX__include */