tinySA/os/hal/platforms/STM32F2xx/adc_lld.h

/*
    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
                 2011,2012 Giovanni Di Sirio.

    This file is part of ChibiOS/RT.

    ChibiOS/RT is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    ChibiOS/RT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/**
 * @file    STM32F2xx/adc_lld.h
 * @brief   STM32F2xx ADC subsystem low level driver header.
 *
 * @addtogroup ADC
 * @{
 */

#ifndef _ADC_LLD_H_
#define _ADC_LLD_H_

#if HAL_USE_ADC || defined(__DOXYGEN__)

/*===========================================================================*/
/* Driver constants.                                                         */
/*===========================================================================*/

/**
 * @name    Absolute Maximum Ratings
 * @{
 */
/**
 * @brief   Maximum HSE  clock frequency.
 */
#define STM32_ADCCLK_MIN        600000

/**
 * @brief   Maximum HSE  clock frequency.
 * @note    This value is arbitrary defined, the current datasheet does not
 *          define a maximum value (it is TBD). A value of 36MHz is mentioned
 *          but without relationship to VDD ranges.
 */
#define STM32_ADCCLK_MAX        42000000
/** @} */

/**
 * @name    Triggers selection
 * @{
 */
#define ADC_CR2_EXTSEL_SRC(n)   ((n) << 24) /**< @brief Trigger source.     */
/** @} */

/**
 * @name    ADC clock divider settings
 * @{
 */
#define ADC_CCR_ADCPRE_DIV2     0
#define ADC_CCR_ADCPRE_DIV4     1
#define ADC_CCR_ADCPRE_DIV6     2
#define ADC_CCR_ADCPRE_DIV8     3
/** @} */

/**
 * @name    Available analog channels
 * @{
 */
#define ADC_CHANNEL_IN0         0   /**< @brief External analog input 0.    */
#define ADC_CHANNEL_IN1         1   /**< @brief External analog input 1.    */
#define ADC_CHANNEL_IN2         2   /**< @brief External analog input 2.    */
#define ADC_CHANNEL_IN3         3   /**< @brief External analog input 3.    */
#define ADC_CHANNEL_IN4         4   /**< @brief External analog input 4.    */
#define ADC_CHANNEL_IN5         5   /**< @brief External analog input 5.    */
#define ADC_CHANNEL_IN6         6   /**< @brief External analog input 6.    */
#define ADC_CHANNEL_IN7         7   /**< @brief External analog input 7.    */
#define ADC_CHANNEL_IN8         8   /**< @brief External analog input 8.    */
#define ADC_CHANNEL_IN9         9   /**< @brief External analog input 9.    */
#define ADC_CHANNEL_IN10        10  /**< @brief External analog input 10.   */
#define ADC_CHANNEL_IN11        11  /**< @brief External analog input 11.   */
#define ADC_CHANNEL_IN12        12  /**< @brief External analog input 12.   */
#define ADC_CHANNEL_IN13        13  /**< @brief External analog input 13.   */
#define ADC_CHANNEL_IN14        14  /**< @brief External analog input 14.   */
#define ADC_CHANNEL_IN15        15  /**< @brief External analog input 15.   */
#define ADC_CHANNEL_SENSOR      16  /**< @brief Internal temperature sensor.
                                         @note Available onADC1 only.       */
#define ADC_CHANNEL_VREFINT     17  /**< @brief Internal reference.
                                         @note Available onADC1 only.       */
#define ADC_CHANNEL_VBAT        18  /**< @brief VBAT.
                                         @note Available onADC1 only.       */
/** @} */

/**
 * @name    Sampling rates
 * @{
 */
#define ADC_SAMPLE_3            0   /**< @brief 3 cycles sampling time.     */
#define ADC_SAMPLE_15           1   /**< @brief 15 cycles sampling time.    */
#define ADC_SAMPLE_28           2   /**< @brief 28 cycles sampling time.    */
#define ADC_SAMPLE_56           3   /**< @brief 56 cycles sampling time.    */
#define ADC_SAMPLE_84           4   /**< @brief 84 cycles sampling time.    */
#define ADC_SAMPLE_112          5   /**< @brief 112 cycles sampling time.   */
#define ADC_SAMPLE_144          6   /**< @brief 144 cycles sampling time.   */
#define ADC_SAMPLE_480          7   /**< @brief 480 cycles sampling time.   */
/** @} */

/*===========================================================================*/
/* Driver pre-compile time settings.                                         */
/*===========================================================================*/

/**
 * @name    Configuration options
 * @{
 */
/**
 * @brief   ADC common clock divider.
 * @note    This setting is influenced by the VDDA voltage and other
 *          external conditions, please refer to the STM32L15x datasheet
 *          for more info.<br>
 *          See section 6.3.15 "12-bit ADC characteristics".
 */
#if !defined(STM32_ADC_ADCPRE) || defined(__DOXYGEN__)
#define STM32_ADC_ADCPRE                    ADC_CCR_ADCPRE_DIV2
#endif

/**
 * @brief   ADC1 driver enable switch.
 * @details If set to @p TRUE the support for ADC1 is included.
 * @note    The default is @p TRUE.
 */
#if !defined(STM32_ADC_USE_ADC1) || defined(__DOXYGEN__)
#define STM32_ADC_USE_ADC1                  TRUE
#endif

/**
 * @brief   ADC2 driver enable switch.
 * @details If set to @p TRUE the support for ADC2 is included.
 * @note    The default is @p TRUE.
 */
#if !defined(STM32_ADC_USE_ADC2) || defined(__DOXYGEN__)
#define STM32_ADC_USE_ADC2                  TRUE
#endif

/**
 * @brief   ADC3 driver enable switch.
 * @details If set to @p TRUE the support for ADC3 is included.
 * @note    The default is @p TRUE.
 */
#if !defined(STM32_ADC_USE_ADC3) || defined(__DOXYGEN__)
#define STM32_ADC_USE_ADC3                  TRUE
#endif

/**
 * @brief   DMA stream used for ADC1 operations.
 */
#if !defined(STM32_ADC_ADC1_DMA_STREAM) || defined(__DOXYGEN__)
#define STM32_ADC_ADC1_DMA_STREAM        STM32_DMA_STREAM_ID(2, 4)
#endif

/**
 * @brief   DMA stream used for ADC2 operations.
 */
#if !defined(STM32_ADC_ADC2_DMA_STREAM) || defined(__DOXYGEN__)
#define STM32_ADC_ADC2_DMA_STREAM        STM32_DMA_STREAM_ID(2, 2)
#endif

/**
 * @brief   DMA stream used for ADC3 operations.
 */
#if !defined(STM32_ADC_ADC3_DMA_STREAM) || defined(__DOXYGEN__)
#define STM32_ADC_ADC3_DMA_STREAM        STM32_DMA_STREAM_ID(2, 1)
#endif

/**
 * @brief   ADC1 DMA priority (0..3|lowest..highest).
 */
#if !defined(STM32_ADC_ADC1_DMA_PRIORITY) || defined(__DOXYGEN__)
#define STM32_ADC_ADC1_DMA_PRIORITY         2
#endif

/**
 * @brief   ADC2 DMA priority (0..3|lowest..highest).
 */
#if !defined(STM32_ADC_ADC2_DMA_PRIORITY) || defined(__DOXYGEN__)
#define STM32_ADC_ADC2_DMA_PRIORITY         2
#endif

/**
 * @brief   ADC3 DMA priority (0..3|lowest..highest).
 */
#if !defined(STM32_ADC_ADC3_DMA_PRIORITY) || defined(__DOXYGEN__)
#define STM32_ADC_ADC3_DMA_PRIORITY         2
#endif

/**
 * @brief   ADC interrupt priority level setting.
 * @note    This setting is shared among ADC1, ADC2 and ADC3 because
 *          all ADCs share the same vector.
 */
#if !defined(STM32_ADC_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define STM32_ADC_IRQ_PRIORITY              5
#endif

/**
 * @brief   ADC1 DMA interrupt priority level setting.
 */
#if !defined(STM32_ADC_ADC1_DMA_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define STM32_ADC_ADC1_DMA_IRQ_PRIORITY     5
#endif

/**
 * @brief   ADC2 DMA interrupt priority level setting.
 */
#if !defined(STM32_ADC_ADC2_DMA_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define STM32_ADC_ADC2_DMA_IRQ_PRIORITY     5
#endif

/**
 * @brief   ADC3 DMA interrupt priority level setting.
 */
#if !defined(STM32_ADC_ADC3_DMA_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define STM32_ADC_ADC3_DMA_IRQ_PRIORITY     5
#endif

/** @} */

/*===========================================================================*/
/* Derived constants and error checks.                                       */
/*===========================================================================*/

#if STM32_ADC_USE_ADC1 && !STM32_HAS_ADC1
#error "ADC1 not present in the selected device"
#endif

#if STM32_ADC_USE_ADC2 && !STM32_HAS_ADC2
#error "ADC2 not present in the selected device"
#endif

#if STM32_ADC_USE_ADC3 && !STM32_HAS_ADC3
#error "ADC3 not present in the selected device"
#endif

#if !STM32_ADC_USE_ADC1 && !STM32_ADC_USE_ADC2 && !STM32_ADC_USE_ADC3
#error "ADC driver activated but no ADC peripheral assigned"
#endif

#if STM32_ADC_USE_ADC1 &&                                                   \
    !STM32_DMA_IS_VALID_ID(STM32_ADC_ADC1_DMA_STREAM, STM32_ADC1_DMA_MSK)
#error "invalid DMA stream associated to ADC1"
#endif

#if STM32_ADC_USE_ADC2 &&                                                   \
    !STM32_DMA_IS_VALID_ID(STM32_ADC_ADC2_DMA_STREAM, STM32_ADC2_DMA_MSK)
#error "invalid DMA stream associated to ADC2"
#endif

#if STM32_ADC_USE_ADC3 &&                                                   \
    !STM32_DMA_IS_VALID_ID(STM32_ADC_ADC3_DMA_STREAM, STM32_ADC3_DMA_MSK)
#error "invalid DMA stream associated to ADC3"
#endif

/* ADC clock related settings and checks.*/
#if STM32_ADC_ADCPRE == ADC_CCR_ADCPRE_DIV2
#define STM32_ADCCLK                        (STM32_PCLK2 / 2)
#elif STM32_ADC_ADCPRE == ADC_CCR_ADCPRE_DIV4
#define STM32_ADCCLK                        (STM32_PCLK2 / 4)
#elif STM32_ADC_ADCPRE == ADC_CCR_ADCPRE_DIV6
#define STM32_ADCCLK                        (STM32_PCLK2 / 6)
#elif STM32_ADC_ADCPRE == ADC_CCR_ADCPRE_DIV8
#define STM32_ADCCLK                        (STM32_PCLK2 / 8)
#else
#error "invalid STM32_ADC_ADCPRE value specified"
#endif

#if (STM32_ADCCLK < STM32_ADCCLK_MIN) || (STM32_ADCCLK > STM32_ADCCLK_MAX)
#error "STM32_ADCCLK outside acceptable range (STM32_ADCCLK_MIN...STM32_ADCCLK_MAX)"
#endif

#if !defined(STM32_DMA_REQUIRED)
#define STM32_DMA_REQUIRED
#endif

/*===========================================================================*/
/* Driver data structures and types.                                         */
/*===========================================================================*/

/**
 * @brief   ADC sample data type.
 */
typedef uint16_t adcsample_t;

/**
 * @brief   Channels number in a conversion group.
 */
typedef uint16_t adc_channels_num_t;

/**
 * @brief   Possible ADC failure causes.
 * @note    Error codes are architecture dependent and should not relied
 *          upon.
 */
typedef enum {
  ADC_ERR_DMAFAILURE = 0,                   /**< DMA operations failure.    */
  ADC_ERR_OVERFLOW = 1                      /**< ADC overflow condition.    */
} adcerror_t;

/**
 * @brief   Type of a structure representing an ADC driver.
 */
typedef struct ADCDriver ADCDriver;

/**
 * @brief   ADC notification callback type.
 *
 * @param[in] adcp      pointer to the @p ADCDriver object triggering the
 *                      callback
 * @param[in] buffer    pointer to the most recent samples data
 * @param[in] n         number of buffer rows available starting from @p buffer
 */
typedef void (*adccallback_t)(ADCDriver *adcp, adcsample_t *buffer, size_t n);

/**
 * @brief   ADC error callback type.
 *
 * @param[in] adcp      pointer to the @p ADCDriver object triggering the
 *                      callback
 */
typedef void (*adcerrorcallback_t)(ADCDriver *adcp, adcerror_t err);

/**
 * @brief   Conversion group configuration structure.
 * @details This implementation-dependent structure describes a conversion
 *          operation.
 * @note    The use of this configuration structure requires knowledge of
 *          STM32 ADC cell registers interface, please refer to the STM32
 *          reference manual for details.
 */
typedef struct {
  /**
   * @brief   Enables the circular buffer mode for the group.
   */
  bool_t                    circular;
  /**
   * @brief   Number of the analog channels belonging to the conversion group.
   */
  adc_channels_num_t        num_channels;
  /**
   * @brief   Callback function associated to the group or @p NULL.
   */
  adccallback_t             end_cb;
  /**
   * @brief   Error callback or @p NULL.
   */
  adcerrorcallback_t        error_cb;
  /* End of the mandatory fields.*/
  /**
   * @brief   ADC CR1 register initialization data.
   * @note    All the required bits must be defined into this field except
   *          @p ADC_CR1_SCAN that is enforced inside the driver.
   */
  uint32_t                  cr1;
  /**
   * @brief   ADC CR2 register initialization data.
   * @note    All the required bits must be defined into this field except
   *          @p ADC_CR2_DMA, @p ADC_CR2_CONT and @p ADC_CR2_ADON that are
   *          enforced inside the driver.
   */
  uint32_t                  cr2;
  /**
   * @brief   ADC SMPR1 register initialization data.
   * @details In this field must be specified the sample times for channels
   *          10...18.
   */
  uint32_t                  smpr1;
  /**
   * @brief   ADC SMPR2 register initialization data.
   * @details In this field must be specified the sample times for channels
   *          0...9.
   */
  uint32_t                  smpr2;
  /**
   * @brief   ADC SQR1 register initialization data.
   * @details Conversion group sequence 13...16 + sequence length.
   */
  uint32_t                  sqr1;
  /**
   * @brief   ADC SQR2 register initialization data.
   * @details Conversion group sequence 7...12.
   */
  uint32_t                  sqr2;
  /**
   * @brief   ADC SQR3 register initialization data.
   * @details Conversion group sequence 1...6.
   */
  uint32_t                  sqr3;
} ADCConversionGroup;

/**
 * @brief   Driver configuration structure.
 * @note    It could be empty on some architectures.
 */
typedef struct {
  uint32_t                  dummy;
} ADCConfig;

/**
 * @brief   Structure representing an ADC driver.
 */
struct ADCDriver {
  /**
   * @brief Driver state.
   */
  adcstate_t                state;
  /**
   * @brief Current configuration data.
   */
  const ADCConfig           *config;
  /**
   * @brief Current samples buffer pointer or @p NULL.
   */
  adcsample_t               *samples;
  /**
   * @brief Current samples buffer depth or @p 0.
   */
  size_t                    depth;
  /**
   * @brief Current conversion group pointer or @p NULL.
   */
  const ADCConversionGroup  *grpp;
#if ADC_USE_WAIT || defined(__DOXYGEN__)
  /**
   * @brief Waiting thread.
   */
  Thread                    *thread;
#endif
#if ADC_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
#if CH_USE_MUTEXES || defined(__DOXYGEN__)
  /**
   * @brief Mutex protecting the peripheral.
   */
  Mutex                     mutex;
#elif CH_USE_SEMAPHORES
  Semaphore                 semaphore;
#endif
#endif /* ADC_USE_MUTUAL_EXCLUSION */
#if defined(ADC_DRIVER_EXT_FIELDS)
  ADC_DRIVER_EXT_FIELDS
#endif
  /* End of the mandatory fields.*/
  /**
   * @brief Pointer to the ADCx registers block.
   */
  ADC_TypeDef               *adc;
  /**
   * @brief Pointer to associated SMA channel.
   */
  const stm32_dma_stream_t  *dmastp;
  /**
   * @brief DMA mode bit mask.
   */
  uint32_t                  dmamode;
};

/*===========================================================================*/
/* Driver macros.                                                            */
/*===========================================================================*/

/**
 * @name    Sequences building helper macros
 * @{
 */
/**
 * @brief   Number of channels in a conversion sequence.
 */
#define ADC_SQR1_NUM_CH(n)      (((n) - 1) << 20)

#define ADC_SQR3_SQ1_N(n)       ((n) << 0)  /**< @brief 1st channel in seq. */
#define ADC_SQR3_SQ2_N(n)       ((n) << 5)  /**< @brief 2nd channel in seq. */
#define ADC_SQR3_SQ3_N(n)       ((n) << 10) /**< @brief 3rd channel in seq. */
#define ADC_SQR3_SQ4_N(n)       ((n) << 15) /**< @brief 4th channel in seq. */
#define ADC_SQR3_SQ5_N(n)       ((n) << 20) /**< @brief 5th channel in seq. */
#define ADC_SQR3_SQ6_N(n)       ((n) << 25) /**< @brief 6th channel in seq. */

#define ADC_SQR2_SQ7_N(n)       ((n) << 0)  /**< @brief 7th channel in seq. */
#define ADC_SQR2_SQ8_N(n)       ((n) << 5)  /**< @brief 8th channel in seq. */
#define ADC_SQR2_SQ9_N(n)       ((n) << 10) /**< @brief 9th channel in seq. */
#define ADC_SQR2_SQ10_N(n)      ((n) << 15) /**< @brief 10th channel in seq.*/
#define ADC_SQR2_SQ11_N(n)      ((n) << 20) /**< @brief 11th channel in seq.*/
#define ADC_SQR2_SQ12_N(n)      ((n) << 25) /**< @brief 12th channel in seq.*/

#define ADC_SQR1_SQ13_N(n)      ((n) << 0)  /**< @brief 13th channel in seq.*/
#define ADC_SQR1_SQ14_N(n)      ((n) << 5)  /**< @brief 14th channel in seq.*/
#define ADC_SQR1_SQ15_N(n)      ((n) << 10) /**< @brief 15th channel in seq.*/
#define ADC_SQR1_SQ16_N(n)      ((n) << 15) /**< @brief 16th channel in seq.*/
/** @} */

/**
 * @name    Sampling rate settings helper macros
 * @{
 */
#define ADC_SMPR2_SMP_AN0(n)    ((n) << 0)  /**< @brief AN0 sampling time.  */
#define ADC_SMPR2_SMP_AN1(n)    ((n) << 3)  /**< @brief AN1 sampling time.  */
#define ADC_SMPR2_SMP_AN2(n)    ((n) << 6)  /**< @brief AN2 sampling time.  */
#define ADC_SMPR2_SMP_AN3(n)    ((n) << 9)  /**< @brief AN3 sampling time.  */
#define ADC_SMPR2_SMP_AN4(n)    ((n) << 12) /**< @brief AN4 sampling time.  */
#define ADC_SMPR2_SMP_AN5(n)    ((n) << 15) /**< @brief AN5 sampling time.  */
#define ADC_SMPR2_SMP_AN6(n)    ((n) << 18) /**< @brief AN6 sampling time.  */
#define ADC_SMPR2_SMP_AN7(n)    ((n) << 21) /**< @brief AN7 sampling time.  */
#define ADC_SMPR2_SMP_AN8(n)    ((n) << 24) /**< @brief AN8 sampling time.  */
#define ADC_SMPR2_SMP_AN9(n)    ((n) << 27) /**< @brief AN9 sampling time.  */

#define ADC_SMPR1_SMP_AN10(n)   ((n) << 0)  /**< @brief AN10 sampling time. */
#define ADC_SMPR1_SMP_AN11(n)   ((n) << 3)  /**< @brief AN11 sampling time. */
#define ADC_SMPR1_SMP_AN12(n)   ((n) << 6)  /**< @brief AN12 sampling time. */
#define ADC_SMPR1_SMP_AN13(n)   ((n) << 9)  /**< @brief AN13 sampling time. */
#define ADC_SMPR1_SMP_AN14(n)   ((n) << 12) /**< @brief AN14 sampling time. */
#define ADC_SMPR1_SMP_AN15(n)   ((n) << 15) /**< @brief AN15 sampling time. */
#define ADC_SMPR1_SMP_SENSOR(n) ((n) << 18) /**< @brief Temperature Sensor
                                                 sampling time.             */
#define ADC_SMPR1_SMP_VREF(n)   ((n) << 21) /**< @brief Voltage Reference
                                                 sampling time.             */
#define ADC_SMPR1_SMP_VBAT(n)   ((n) << 24) /**< @brief VBAT sampling time. */
/** @} */

/*===========================================================================*/
/* External declarations.                                                    */
/*===========================================================================*/

#if STM32_ADC_USE_ADC1 && !defined(__DOXYGEN__)
extern ADCDriver ADCD1;
#endif

#if STM32_ADC_USE_ADC2 && !defined(__DOXYGEN__)
extern ADCDriver ADCD2;
#endif

#if STM32_ADC_USE_ADC3 && !defined(__DOXYGEN__)
extern ADCDriver ADCD3;
#endif

#ifdef __cplusplus
extern "C" {
#endif
  void adc_lld_init(void);
  void adc_lld_start(ADCDriver *adcp);
  void adc_lld_stop(ADCDriver *adcp);
  void adc_lld_start_conversion(ADCDriver *adcp);
  void adc_lld_stop_conversion(ADCDriver *adcp);
  void adcSTM32EnableTSVREFE(void);
  void adcSTM32DisableTSVREFE(void);
  void adcSTM32EnableVBATE(void);
  void adcSTM32DisableVBATE(void);
#ifdef __cplusplus
}
#endif

#endif /* HAL_USE_ADC */

#endif /* _ADC_LLD_H_ */

/** @} */