/* 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 . */ /** * @file STM32F0xx/adc_lld.h * @brief STM32F0xx 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 Sampling rates * @{ */ #define ADC_SMPR_SMP_1P5 0 /**< @brief 14 cycles conversion time */ #define ADC_SMPR_SMP_7P5 1 /**< @brief 21 cycles conversion time. */ #define ADC_SMPR_SMP_13P5 2 /**< @brief 28 cycles conversion time. */ #define ADC_SMPR_SMP_28P5 3 /**< @brief 41 cycles conversion time. */ #define ADC_SMPR_SMP_41P5 4 /**< @brief 54 cycles conversion time. */ #define ADC_SMPR_SMP_55P5 5 /**< @brief 68 cycles conversion time. */ #define ADC_SMPR_SMP_71P5 6 /**< @brief 84 cycles conversion time. */ #define ADC_SMPR_SMP_239P5 7 /**< @brief 252 cycles conversion time. */ /** @} */ /** * @name Resolution * @{ */ #define ADC_CFGR1_RES_12BIT (0 << 3) #define ADC_CFGR1_RES_10BIT (1 << 3) #define ADC_CFGR1_RES_8BIT (2 << 3) #define ADC_CFGR1_RES_6BIT (3 << 3) /** @} */ /** * @name Threashold register initializer * @{ */ #define ADC_TR(low, high) (((uint32_t)(high) << 16) | (uint32_t)(low)) /** @} */ /*===========================================================================*/ /* Driver pre-compile time settings. */ /*===========================================================================*/ /** * @name Configuration options * @{ */ /** * @brief ADC1 driver enable switch. * @details If set to @p TRUE the support for ADC1 is included. * @note The default is @p FALSE. */ #if !defined(STM32_ADC_USE_ADC1) || defined(__DOXYGEN__) #define STM32_ADC_USE_ADC1 FALSE #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 ADC interrupt priority level setting. */ #if !defined(STM32_ADC_IRQ_PRIORITY) || defined(__DOXYGEN__) #define STM32_ADC_IRQ_PRIORITY 2 #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 2 #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_ADC1 #error "ADC driver activated but no ADC peripheral assigned" #endif #if STM32_ADC_USE_ADC1 && \ !CORTEX_IS_VALID_KERNEL_PRIORITY(STM32_ADC_IRQ_PRIORITY) #error "Invalid IRQ priority assigned to ADC1" #endif #if STM32_ADC_USE_ADC1 && \ !CORTEX_IS_VALID_KERNEL_PRIORITY(STM32_ADC_ADC1_DMA_IRQ_PRIORITY) #error "Invalid IRQ priority assigned to ADC1 DMA" #endif #if STM32_ADC_USE_ADC1 && \ !STM32_DMA_IS_VALID_PRIORITY(STM32_ADC_ADC1_DMA_PRIORITY) #error "Invalid DMA priority assigned to ADC1" #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. */ ADC_ERR_AWD = 2 /**< Analog watchdog triggered. */ } 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 * @param[in] err ADC error code */ 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 CFGR1 register initialization data. */ uint32_t cfgr1; /** * @brief ADC TR register initialization data. */ uint32_t tr; /** * @brief ADC SMPR register initialization data. */ uint32_t smpr; /** * @brief ADC CHSELR register initialization data. * @details The number of bits at logic level one in this register must * be equal to the number in the @p num_channels field. */ uint32_t chselr; } 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 DMA channel. */ const stm32_dma_stream_t *dmastp; /** * @brief DMA mode bit mask. */ uint32_t dmamode; }; /*===========================================================================*/ /* Driver macros. */ /*===========================================================================*/ /** * @brief Changes the value of the ADC CCR register. * @details Use this function in order to enable or disable the internal * analog sources. See the documentation in the STM32F0xx Reference * Manual. */ #define adcSTM32SetCCR(ccr) (ADC->CCR = (ccr)) /*===========================================================================*/ /* External declarations. */ /*===========================================================================*/ #if STM32_ADC_USE_ADC1 && !defined(__DOXYGEN__) extern ADCDriver ADCD1; #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); #ifdef __cplusplus } #endif #endif /* HAL_USE_ADC */ #endif /* _ADC_LLD_H_ */ /** @} */