ADCBufCC26X2.h

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/*!****************************************************************************
 *  @file       ADCBufCC26X2.h
 *
 *  @brief      ADCBuf driver implementation for a CC26X2 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/ADCBufCC26X2.h>
 *  @endcode
 *
 * # Overview #
 * This is a CC26X2 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/ADCBufCC26X2. 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
 * ADCBufCC26X2_ParamsExtension in the custom field of the ADCBuf_Params that
 * suits your application. The default settings work for many, but not all,
 * use cases.
 *
 * # 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 adcBufCC26x2Objects
 * 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
 * ADCBufCC26X2_CMD_ACQUIRE_ADC_SEMAPHORE. It will be released again
 * automatically after the next conversion completes.
 *
 * In both ADCBufCC26X2_SAMPING_MODE_SYNCHRONOUS mode and
 * ADCBufCC26X2_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 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
 * CC26x2 and CC13x2. 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 ADCBufCC26X2_adcChannelLut table in the board file.
 *
 * | DIO    | CC26x2 7x7 AUXIO CompBInput   | CC13x2 7x7 AUXIO CompBInput
 * |--------|-------------------------------|-------------------------------
 * | 0      | No                            | No
 * | 1      | No                            | No
 * | 2      | No                            | No
 * | 3      | No                            | No
 * | 4      | No                            | No
 * | 5      | No                            | No
 * | 6      | No                            | No
 * | 7      | No                            | No
 * | 8      | No                            | No
 * | 9      | No                            | No
 * | 10     | No                            | No
 * | 11     | No                            | No
 * | 12     | No                            | No
 * | 13     | No                            | No
 * | 14     | No                            | No
 * | 15-22  | No                            | No
 * | 23     | ADC_COMPB_IN_AUXIO7           | ADC_COMPB_IN_AUXIO7
 * | 24     | ADC_COMPB_IN_AUXIO6           | ADC_COMPB_IN_AUXIO6
 * | 25     | ADC_COMPB_IN_AUXIO5           | ADC_COMPB_IN_AUXIO5
 * | 26     | ADC_COMPB_IN_AUXIO4           | ADC_COMPB_IN_AUXIO4
 * | 27     | ADC_COMPB_IN_AUXIO3           | ADC_COMPB_IN_AUXIO3
 * | 28     | ADC_COMPB_IN_AUXIO2           | ADC_COMPB_IN_AUXIO2
 * | 29     | ADC_COMPB_IN_AUXIO1           | ADC_COMPB_IN_AUXIO1
 * | 30     | ADC_COMPB_IN_AUXIO0           | ADC_COMPB_IN_AUXIO0
 *
 * # 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
 * ADCBufCC26X2_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 ADCBufCC26X2 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.
 * 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 CONFIG_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(CONFIG_ADCBuf0, &adcBufParams);
  *      if (adcBufHandle == NULL) {
 *          // handle error
 *      }
 *
 *      blockingConversion.arg = NULL;
 *      blockingConversion.adcChannel = CONFIG_ADCCHANNEL_A1;
 *      blockingConversion.sampleBuffer = sampleBufferOne;
 *      blockingConversion.sampleBufferTwo = NULL;
 *      blockingConversion.samplesRequestedCount = ADCBUFFERSIZE;
 *
 *      if (ADCBuf_convert(adcBufHandle, &blockingConversion, 1) != ADCBuf_STATUS_SUCCESS) {
 *          // handle error
 *      }
 *  @endcode
 *
 * ## Using ADCBufCC26X2_ParamsExtension #
 *  This specific configuration performs one conversion on CONFIG_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];
 *      ADCBufCC26X2_ParamsExtension customParams;
 *
 *      ADCBuf_Params_init(&adcBufParams);
 *      ADCBufCC26X2_ParamsExtension_init(&customParams);
 *      customParams.samplingDuration    = ADCBufCC26X2_SAMPLING_DURATION_2P7_US;
 *      customParams.refSource           = ADCBufCC26X2_FIXED_REFERENCE;
 *      customParams.samplingMode        = ADCBufCC26X2_SAMPING_MODE_SYNCHRONOUS;
 *      customParams.inputScalingEnabled = true;
 *
 *      adcBufParams.custom = &customParams;
 *
 *      adcBufHandle = ADCBuf_open(CONFIG_ADCBuf0, &adcBufParams);
 *      if (adcBufHandle == NULL) {
 *          // handle error
 *      }
 *
 *      blockingConversion.arg = NULL;
 *      blockingConversion.adcChannel = CONFIG_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

#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/PowerCC26X2.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>

#ifdef __cplusplus
extern "C" {
#endif

/* Add ADCBufCC26X2_CMD_* macros here */

#define ADCBufCC26X2_CMD_ACQUIRE_ADC_SEMAPHORE ADCBuf_CMD_RESERVED + 1

#define ADCBufCC26X2_CMD_KEEP_ADC_SEMAPHORE ADCBuf_CMD_RESERVED + 2

#define ADCBufCC26X2_CMD_KEEP_ADC_SEMAPHORE_DISABLE ADCBuf_CMD_RESERVED + 3

#define ADCBufCC26X2_CMD_RELEASE_ADC_SEMAPHORE ADCBuf_CMD_RESERVED + 4

#define ADCBufCC26X2_RESOLUTION            12

#define ADCBufCC26X2_BYTES_PER_SAMPLE      2

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

/* ADCBuf function table pointer */
extern const ADCBuf_FxnTable ADCBufCC26X2_fxnTable;


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

typedef enum {
    ADCBufCC26X2_SAMPING_MODE_SYNCHRONOUS,
    ADCBufCC26X2_SAMPING_MODE_ASYNCHRONOUS
} ADCBufCC26X2_Sampling_Mode;

typedef enum {
    ADCBufCC26X2_SAMPLING_DURATION_2P7_US    = AUXADC_SAMPLE_TIME_2P7_US,
    ADCBufCC26X2_SAMPLING_DURATION_5P3_US    = AUXADC_SAMPLE_TIME_5P3_US,
    ADCBufCC26X2_SAMPLING_DURATION_10P6_US   = AUXADC_SAMPLE_TIME_10P6_US,
    ADCBufCC26X2_SAMPLING_DURATION_21P3_US   = AUXADC_SAMPLE_TIME_21P3_US,
    ADCBufCC26X2_SAMPLING_DURATION_42P6_US   = AUXADC_SAMPLE_TIME_42P6_US,
    ADCBufCC26X2_SAMPLING_DURATION_85P3_US   = AUXADC_SAMPLE_TIME_85P3_US,
    ADCBufCC26X2_SAMPLING_DURATION_170_US    = AUXADC_SAMPLE_TIME_170_US,
    ADCBufCC26X2_SAMPLING_DURATION_341_US    = AUXADC_SAMPLE_TIME_341_US,
    ADCBufCC26X2_SAMPLING_DURATION_682_US    = AUXADC_SAMPLE_TIME_682_US,
    ADCBufCC26X2_SAMPLING_DURATION_1P37_MS   = AUXADC_SAMPLE_TIME_1P37_MS,
    ADCBufCC26X2_SAMPLING_DURATION_2P73_MS   = AUXADC_SAMPLE_TIME_2P73_MS,
    ADCBufCC26X2_SAMPLING_DURATION_5P46_MS   = AUXADC_SAMPLE_TIME_5P46_MS,
    ADCBufCC26X2_SAMPLING_DURATION_10P9_MS   = AUXADC_SAMPLE_TIME_10P9_MS
} ADCBufCC26X2_Sampling_Duration;


typedef enum {
    ADCBufCC26X2_FIXED_REFERENCE       = AUXADC_REF_FIXED,
    ADCBufCC26X2_VDDS_REFERENCE        = AUXADC_REF_VDDS_REL
} ADCBufCC26X2_Reference_Source;



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

typedef struct{
    uint8_t dio;            
    uint8_t compBInput;     
} ADCBufCC26X2_AdcChannelLutEntry;

typedef struct{
    ADCBufCC26X2_Sampling_Duration     samplingDuration;
    ADCBufCC26X2_Sampling_Mode         samplingMode;
    ADCBufCC26X2_Reference_Source      refSource;
    bool                                inputScalingEnabled;
} ADCBufCC26X2_ParamsExtension;

typedef struct{
    uint32_t            swiPriority;
    uint8_t             intPriority;
    ADCBufCC26X2_AdcChannelLutEntry  const *adcChannelLut;
    uint8_t             gpTimerUnit;
    bool                acquireADCSem;
} ADCBufCC26X2_HWAttrs;



typedef struct{
    /* ADC control variables */
    bool                            isOpen;                     
    bool                            conversionInProgress;       
    bool                            inputScalingEnabled;        
    bool                            keepADCSemaphore;           
    bool                            adcSemaphoreInPossession;   
    uint8_t                         currentChannel;             
    ADCBufCC26X2_Reference_Source   refSource;                  
    ADCBufCC26X2_Sampling_Mode      samplingMode;               
    ADCBufCC26X2_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;          
} ADCBufCC26X2_Object, *ADCBufCC26X2_Handle;

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


#ifdef __cplusplus
}
#endif

#endif /* ti_drivers_adc_ADCBufCC26XX__include */