Mouse code for the MacroRat
Diff: mbed-dev/targets/TARGET_Atmel/TARGET_SAM_CortexM0P/drivers/adc/TARGET_SAMD21/adc.c
- Revision:
- 18:6a4db94011d3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-dev/targets/TARGET_Atmel/TARGET_SAM_CortexM0P/drivers/adc/TARGET_SAMD21/adc.c Sun May 14 23:18:57 2017 +0000 @@ -0,0 +1,704 @@ +/** + * \file + * + * \brief SAM Peripheral Analog-to-Digital Converter Driver + * + * Copyright (C) 2012-2015 Atmel Corporation. All rights reserved. + * + * \asf_license_start + * + * \page License + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * 2. 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. + * + * 3. The name of Atmel may not be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * 4. This software may only be redistributed and used in connection with an + * Atmel microcontroller product. + * + * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE + * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL 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. + * + * \asf_license_stop + * + */ +/* + * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a> + */ + +#include "adc.h" + +#if SAMD20 +/* The Die revision D number */ +#define REVISON_D_NUM 3 +#endif + +/** + * \brief Initializes an ADC configuration structure to defaults + * + * Initializes a given ADC configuration struct to a set of known default + * values. This function should be called on any new instance of the + * configuration struct before being modified by the user application. + * + * The default configuration is as follows: + * \li GCLK generator 0 (GCLK main) clock source + * \li 1V from internal bandgap reference + * \li Div 4 clock prescaler + * \li 12-bit resolution + * \li Window monitor disabled + * \li No gain + * \li Positive input on ADC PIN 0 + * \li Negative input on ADC PIN 1 + * \li Averaging disabled + * \li Oversampling disabled + * \li Right adjust data + * \li Single-ended mode + * \li Free running disabled + * \li All events (input and generation) disabled + * \li Sleep operation disabled + * \li No reference compensation + * \li No gain/offset correction + * \li No added sampling time + * \li Pin scan mode disabled + * + * \param[out] config Pointer to configuration struct to initialize to + * default values + */ +void adc_get_config_defaults(struct adc_config *const config) +{ + Assert(config); + config->clock_source = GCLK_GENERATOR_0; + config->reference = ADC_REFERENCE_INT1V; + config->clock_prescaler = ADC_CLOCK_PRESCALER_DIV4; + config->resolution = ADC_RESOLUTION_12BIT; + config->window.window_mode = ADC_WINDOW_MODE_DISABLE; + config->window.window_upper_value = 0; + config->window.window_lower_value = 0; + config->gain_factor = ADC_GAIN_FACTOR_1X; +#if SAMR21 + config->positive_input = ADC_POSITIVE_INPUT_PIN6 ; +#else + config->positive_input = ADC_POSITIVE_INPUT_PIN0 ; +#endif + config->negative_input = ADC_NEGATIVE_INPUT_GND ; + config->accumulate_samples = ADC_ACCUMULATE_DISABLE; + config->divide_result = ADC_DIVIDE_RESULT_DISABLE; + config->left_adjust = false; + config->differential_mode = false; + config->freerunning = false; + config->event_action = ADC_EVENT_ACTION_DISABLED; + config->run_in_standby = false; + config->reference_compensation_enable = false; + config->correction.correction_enable = false; + config->correction.gain_correction = ADC_GAINCORR_RESETVALUE; + config->correction.offset_correction = ADC_OFFSETCORR_RESETVALUE; + config->sample_length = 0; + config->pin_scan.offset_start_scan = 0; + config->pin_scan.inputs_to_scan = 0; +} + +/** + * \brief Sets the ADC window mode + * + * Sets the ADC window mode to a given mode and value range. + * + * \param[in] module_inst Pointer to the ADC software instance struct + * \param[in] window_mode Window monitor mode to set + * \param[in] window_lower_value Lower window monitor threshold value + * \param[in] window_upper_value Upper window monitor threshold value + */ +void adc_set_window_mode( + struct adc_module *const module_inst, + const enum adc_window_mode window_mode, + const int16_t window_lower_value, + const int16_t window_upper_value) +{ + /* Sanity check arguments */ + Assert(module_inst); + Assert(module_inst->hw); + + Adc *const adc_module = module_inst->hw; + + while (adc_is_syncing(module_inst)) { + /* Wait for synchronization */ + } + + /* Set window mode */ + adc_module->WINCTRL.reg = window_mode << ADC_WINCTRL_WINMODE_Pos; + + while (adc_is_syncing(module_inst)) { + /* Wait for synchronization */ + } + + /* Set lower window monitor threshold value */ + adc_module->WINLT.reg = window_lower_value << ADC_WINLT_WINLT_Pos; + + while (adc_is_syncing(module_inst)) { + /* Wait for synchronization */ + } + + /* Set upper window monitor threshold value */ + adc_module->WINUT.reg = window_upper_value << ADC_WINUT_WINUT_Pos; +} + +/** +* \internal Configure MUX settings for the analog pins +* +* This function will set the given ADC input pins +* to the analog function in the pinmux, giving +* the ADC access to the analog signal +* +* \param [in] pin AINxx pin to configure +*/ +static inline void _adc_configure_ain_pin(uint32_t pin) +{ +#define PIN_INVALID_ADC_AIN 0xFFFFUL + + /* Pinmapping table for AINxx -> GPIO pin number */ + const uint32_t pinmapping[] = { +#if (SAMD20E) || (SAMD21E)|| (SAMDA1E) + PIN_PA02B_ADC_AIN0, PIN_PA03B_ADC_AIN1, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_PA04B_ADC_AIN4, PIN_PA05B_ADC_AIN5, + PIN_PA06B_ADC_AIN6, PIN_PA07B_ADC_AIN7, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17, + PIN_PA10B_ADC_AIN18, PIN_PA11B_ADC_AIN19, +#elif (SAMD20G) || (SAMD21G)|| (SAMDA1G) + PIN_PA02B_ADC_AIN0, PIN_PA03B_ADC_AIN1, + PIN_PB08B_ADC_AIN2, PIN_PB09B_ADC_AIN3, + PIN_PA04B_ADC_AIN4, PIN_PA05B_ADC_AIN5, + PIN_PA06B_ADC_AIN6, PIN_PA07B_ADC_AIN7, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_PB02B_ADC_AIN10, PIN_PB03B_ADC_AIN11, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17, + PIN_PA10B_ADC_AIN18, PIN_PA11B_ADC_AIN19, +#elif (SAMD20J) || (SAMD21J)|| (SAMDA1J) + PIN_PA02B_ADC_AIN0, PIN_PA03B_ADC_AIN1, + PIN_PB08B_ADC_AIN2, PIN_PB09B_ADC_AIN3, + PIN_PA04B_ADC_AIN4, PIN_PA05B_ADC_AIN5, + PIN_PA06B_ADC_AIN6, PIN_PA07B_ADC_AIN7, + PIN_PB00B_ADC_AIN8, PIN_PB01B_ADC_AIN9, + PIN_PB02B_ADC_AIN10, PIN_PB03B_ADC_AIN11, + PIN_PB04B_ADC_AIN12, PIN_PB05B_ADC_AIN13, + PIN_PB06B_ADC_AIN14, PIN_PB07B_ADC_AIN15, + PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17, + PIN_PA10B_ADC_AIN18, PIN_PA11B_ADC_AIN19, +#elif SAMR21E + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_PA06B_ADC_AIN6, PIN_PA07B_ADC_AIN7, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, +#elif SAMR21G + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_PA04B_ADC_AIN4, PIN_PA05B_ADC_AIN5, + PIN_PA06B_ADC_AIN6, PIN_PA07B_ADC_AIN7, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_PB02B_ADC_AIN10, PIN_PB03B_ADC_AIN11, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, +#elif (SAMD10C) || (SAMD11C) + PIN_PA02B_ADC_AIN0, PIN_INVALID_ADC_AIN, + PIN_PA04B_ADC_AIN2, PIN_PA05B_ADC_AIN3, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_PA14B_ADC_AIN6, PIN_PA15B_ADC_AIN7, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, +#elif (SAMD10DS) || (SAMD11DS) + PIN_PA02B_ADC_AIN0, PIN_INVALID_ADC_AIN, + PIN_PA04B_ADC_AIN2, PIN_PA05B_ADC_AIN3, + PIN_PA06B_ADC_AIN4, PIN_PA07B_ADC_AIN5, + PIN_PA14B_ADC_AIN6, PIN_PA15B_ADC_AIN7, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, +#elif (SAMD10DM) || (SAMD11DM) + PIN_PA02B_ADC_AIN0, PIN_PA03B_ADC_AIN1, + PIN_PA04B_ADC_AIN2, PIN_PA05B_ADC_AIN3, + PIN_PA06B_ADC_AIN4, PIN_PA07B_ADC_AIN5, + PIN_PA14B_ADC_AIN6, PIN_PA15B_ADC_AIN7, + PIN_PA10B_ADC_AIN8, PIN_PA11B_ADC_AIN9, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, +#else +# error ADC pin mappings are not defined for this device. +#endif + }; + + uint32_t pin_map_result = PIN_INVALID_ADC_AIN; + + if (pin <= ADC_EXTCHANNEL_MSB) { + pin_map_result = pinmapping[pin >> ADC_INPUTCTRL_MUXPOS_Pos]; + + Assert(pin_map_result != PIN_INVALID_ADC_AIN); + + struct system_pinmux_config config; + system_pinmux_get_config_defaults(&config); + + /* Analog functions are all on MUX setting B */ + config.input_pull = SYSTEM_PINMUX_PIN_PULL_NONE; + config.mux_position = 1; + + system_pinmux_pin_set_config(pin_map_result, &config); + } +} + +/** + * \internal Writes an ADC configuration to the hardware module + * + * Writes out a given ADC module configuration to the hardware module. + * + * \param[out] module_inst Pointer to the ADC software instance struct + * \param[in] config Pointer to configuration struct + * + * \return Status of the configuration procedure + * \retval STATUS_OK The configuration was successful + * \retval STATUS_ERR_INVALID_ARG Invalid argument(s) were provided + */ +static enum status_code _adc_set_config( + struct adc_module *const module_inst, + struct adc_config *const config) +{ + uint8_t adjres = 0; + uint32_t resolution = ADC_RESOLUTION_16BIT; + enum adc_accumulate_samples accumulate = ADC_ACCUMULATE_DISABLE; +#if SAMD20 + uint8_t revision_num = ((REG_DSU_DID & DSU_DID_DIE_Msk) >> DSU_DID_DIE_Pos); +#endif + + /* Get the hardware module pointer */ + Adc *const adc_module = module_inst->hw; + + /* Configure GCLK channel and enable clock */ + struct system_gclk_chan_config gclk_chan_conf; + system_gclk_chan_get_config_defaults(&gclk_chan_conf); + gclk_chan_conf.source_generator = config->clock_source; + system_gclk_chan_set_config(ADC_GCLK_ID, &gclk_chan_conf); + system_gclk_chan_enable(ADC_GCLK_ID); + + /* Setup pinmuxing for analog inputs */ + if (config->pin_scan.inputs_to_scan != 0) { + uint8_t offset = config->pin_scan.offset_start_scan; + uint8_t start_pin = + offset +(uint8_t)config->positive_input; + uint8_t end_pin = + start_pin + config->pin_scan.inputs_to_scan; + + while (start_pin < end_pin) { + _adc_configure_ain_pin((offset % 16)+(uint8_t)config->positive_input); + start_pin++; + offset++; + } + _adc_configure_ain_pin(config->negative_input); + } else { + _adc_configure_ain_pin(config->positive_input); + _adc_configure_ain_pin(config->negative_input); + } + + /* Configure run in standby */ + adc_module->CTRLA.reg = (config->run_in_standby << ADC_CTRLA_RUNSTDBY_Pos); + + /* Configure reference */ + adc_module->REFCTRL.reg = + (config->reference_compensation_enable << ADC_REFCTRL_REFCOMP_Pos) | + (config->reference); + + /* Set adjusting result and number of samples */ + switch (config->resolution) { + + case ADC_RESOLUTION_CUSTOM: + adjres = config->divide_result; + accumulate = config->accumulate_samples; + /* 16-bit result register */ + resolution = ADC_RESOLUTION_16BIT; + break; + + case ADC_RESOLUTION_13BIT: + /* Increase resolution by 1 bit */ + adjres = ADC_DIVIDE_RESULT_2; + accumulate = ADC_ACCUMULATE_SAMPLES_4; + /* 16-bit result register */ + resolution = ADC_RESOLUTION_16BIT; + break; + + case ADC_RESOLUTION_14BIT: + /* Increase resolution by 2 bit */ + adjres = ADC_DIVIDE_RESULT_4; + accumulate = ADC_ACCUMULATE_SAMPLES_16; + /* 16-bit result register */ + resolution = ADC_RESOLUTION_16BIT; + break; +#if SAMD20 + /* See $35.1.8 for ADC errata of SAM D20. + The revisions before D have this issue.*/ + case ADC_RESOLUTION_15BIT: + /* Increase resolution by 3 bit */ + if(revision_num < REVISON_D_NUM) { + adjres = ADC_DIVIDE_RESULT_8; + } else { + adjres = ADC_DIVIDE_RESULT_2; + } + accumulate = ADC_ACCUMULATE_SAMPLES_64; + /* 16-bit result register */ + resolution = ADC_RESOLUTION_16BIT; + break; + + case ADC_RESOLUTION_16BIT: + if(revision_num < REVISON_D_NUM) { + /* Increase resolution by 4 bit */ + adjres = ADC_DIVIDE_RESULT_16; + } else { + adjres = ADC_DIVIDE_RESULT_DISABLE; + } + accumulate = ADC_ACCUMULATE_SAMPLES_256; + /* 16-bit result register */ + resolution = ADC_RESOLUTION_16BIT; + break; +#else + case ADC_RESOLUTION_15BIT: + /* Increase resolution by 3 bit */ + adjres = ADC_DIVIDE_RESULT_2; + accumulate = ADC_ACCUMULATE_SAMPLES_64; + /* 16-bit result register */ + resolution = ADC_RESOLUTION_16BIT; + break; + + case ADC_RESOLUTION_16BIT: + /* Increase resolution by 4 bit */ + adjres = ADC_DIVIDE_RESULT_DISABLE; + accumulate = ADC_ACCUMULATE_SAMPLES_256; + /* 16-bit result register */ + resolution = ADC_RESOLUTION_16BIT; + break; +#endif + case ADC_RESOLUTION_8BIT: + /* 8-bit result register */ + resolution = ADC_RESOLUTION_8BIT; + break; + case ADC_RESOLUTION_10BIT: + /* 10-bit result register */ + resolution = ADC_RESOLUTION_10BIT; + break; + case ADC_RESOLUTION_12BIT: + /* 12-bit result register */ + resolution = ADC_RESOLUTION_12BIT; + break; + + default: + /* Unknown. Abort. */ + return STATUS_ERR_INVALID_ARG; + } + + adc_module->AVGCTRL.reg = ADC_AVGCTRL_ADJRES(adjres) | accumulate; + + /* Check validity of sample length value */ + if (config->sample_length > 63) { + return STATUS_ERR_INVALID_ARG; + } else { + /* Configure sample length */ + adc_module->SAMPCTRL.reg = + (config->sample_length << ADC_SAMPCTRL_SAMPLEN_Pos); + } + + while (adc_is_syncing(module_inst)) { + /* Wait for synchronization */ + } + + /* Configure CTRLB */ + adc_module->CTRLB.reg = + config->clock_prescaler | + resolution | + (config->correction.correction_enable << ADC_CTRLB_CORREN_Pos) | + (config->freerunning << ADC_CTRLB_FREERUN_Pos) | + (config->left_adjust << ADC_CTRLB_LEFTADJ_Pos) | + (config->differential_mode << ADC_CTRLB_DIFFMODE_Pos); + + /* Check validity of window thresholds */ + if (config->window.window_mode != ADC_WINDOW_MODE_DISABLE) { + switch (resolution) { + case ADC_RESOLUTION_8BIT: + if (config->differential_mode && + (config->window.window_lower_value > 127 || + config->window.window_lower_value < -128 || + config->window.window_upper_value > 127 || + config->window.window_upper_value < -128)) { + /* Invalid value */ + return STATUS_ERR_INVALID_ARG; + } else if (config->window.window_lower_value > 255 || + config->window.window_upper_value > 255) { + /* Invalid value */ + return STATUS_ERR_INVALID_ARG; + } + break; + case ADC_RESOLUTION_10BIT: + if (config->differential_mode && + (config->window.window_lower_value > 511 || + config->window.window_lower_value < -512 || + config->window.window_upper_value > 511 || + config->window.window_upper_value < -512)) { + /* Invalid value */ + return STATUS_ERR_INVALID_ARG; + } else if (config->window.window_lower_value > 1023 || + config->window.window_upper_value > 1023) { + /* Invalid value */ + return STATUS_ERR_INVALID_ARG; + } + break; + case ADC_RESOLUTION_12BIT: + if (config->differential_mode && + (config->window.window_lower_value > 2047 || + config->window.window_lower_value < -2048 || + config->window.window_upper_value > 2047 || + config->window.window_upper_value < -2048)) { + /* Invalid value */ + return STATUS_ERR_INVALID_ARG; + } else if (config->window.window_lower_value > 4095 || + config->window.window_upper_value > 4095) { + /* Invalid value */ + return STATUS_ERR_INVALID_ARG; + } + break; + case ADC_RESOLUTION_16BIT: + if (config->differential_mode && + (config->window.window_lower_value > 32767 || + config->window.window_lower_value < -32768 || + config->window.window_upper_value > 32767 || + config->window.window_upper_value < -32768)) { + /* Invalid value */ + return STATUS_ERR_INVALID_ARG; + } else if (config->window.window_lower_value > 65535 || + config->window.window_upper_value > 65535) { + /* Invalid value */ + return STATUS_ERR_INVALID_ARG; + } + break; + } + } + + while (adc_is_syncing(module_inst)) { + /* Wait for synchronization */ + } + + /* Configure window mode */ + adc_module->WINCTRL.reg = config->window.window_mode; + + while (adc_is_syncing(module_inst)) { + /* Wait for synchronization */ + } + + /* Configure lower threshold */ + adc_module->WINLT.reg = + config->window.window_lower_value << ADC_WINLT_WINLT_Pos; + + while (adc_is_syncing(module_inst)) { + /* Wait for synchronization */ + } + + /* Configure lower threshold */ + adc_module->WINUT.reg = config->window.window_upper_value << + ADC_WINUT_WINUT_Pos; + + uint8_t inputs_to_scan = config->pin_scan.inputs_to_scan; + if (inputs_to_scan > 0) { + /* + * Number of input sources included is the value written to INPUTSCAN + * plus 1. + */ + inputs_to_scan--; + } + + if (inputs_to_scan > (ADC_INPUTCTRL_INPUTSCAN_Msk >> ADC_INPUTCTRL_INPUTSCAN_Pos) || + config->pin_scan.offset_start_scan > (ADC_INPUTCTRL_INPUTOFFSET_Msk >> ADC_INPUTCTRL_INPUTOFFSET_Pos)) { + /* Invalid number of input pins or input offset */ + return STATUS_ERR_INVALID_ARG; + } + + while (adc_is_syncing(module_inst)) { + /* Wait for synchronization */ + } + + /* Configure pin scan mode and positive and negative input pins */ + adc_module->INPUTCTRL.reg = + config->gain_factor | + (config->pin_scan.offset_start_scan << + ADC_INPUTCTRL_INPUTOFFSET_Pos) | + (inputs_to_scan << ADC_INPUTCTRL_INPUTSCAN_Pos) | + config->negative_input | + config->positive_input; + + /* Configure events */ + adc_module->EVCTRL.reg = config->event_action; + + /* Disable all interrupts */ + adc_module->INTENCLR.reg = + (1 << ADC_INTENCLR_SYNCRDY_Pos) | (1 << ADC_INTENCLR_WINMON_Pos) | + (1 << ADC_INTENCLR_OVERRUN_Pos) | (1 << ADC_INTENCLR_RESRDY_Pos); + + if (config->correction.correction_enable) { + /* Make sure gain_correction value is valid */ + if (config->correction.gain_correction > ADC_GAINCORR_GAINCORR_Msk) { + return STATUS_ERR_INVALID_ARG; + } else { + /* Set gain correction value */ + adc_module->GAINCORR.reg = config->correction.gain_correction << + ADC_GAINCORR_GAINCORR_Pos; + } + + /* Make sure offset correction value is valid */ + if (config->correction.offset_correction > 2047 || + config->correction.offset_correction < -2048) { + return STATUS_ERR_INVALID_ARG; + } else { + /* Set offset correction value */ + adc_module->OFFSETCORR.reg = config->correction.offset_correction << + ADC_OFFSETCORR_OFFSETCORR_Pos; + } + } + + /* Load in the fixed device ADC calibration constants */ + adc_module->CALIB.reg = + ADC_CALIB_BIAS_CAL( + (*(uint32_t *)ADC_FUSES_BIASCAL_ADDR >> ADC_FUSES_BIASCAL_Pos) + ) | + ADC_CALIB_LINEARITY_CAL( + (*(uint64_t *)ADC_FUSES_LINEARITY_0_ADDR >> ADC_FUSES_LINEARITY_0_Pos) + ); + + return STATUS_OK; +} + +/** + * \brief Initializes the ADC channel sequence + * + * Like SAMD and SAMR21 the INPUTOFFSET register will be incremented one + * automatically after a conversion done, causing the next conversion + * to be done with the positive input equal to MUXPOS + INPUTOFFSET, + * it is scanning continuously one by one even ADC channels are not continuous. + * + * Initializes the ADC channel sequence by the sequence of pin_array. + * + * \param[in] pin_array The array of the Mux selection for the positive ADC input + * \param[in] size The size of pin_array + */ +void adc_regular_ain_channel(uint32_t *pin_array, uint8_t size) +{ + for (int i = 0; i < size; i++) { + _adc_configure_ain_pin(pin_array[i]); + } +} + +/** + * \brief Initializes the ADC + * + * Initializes the ADC device struct and the hardware module based on the + * given configuration struct values. + * + * \param[out] module_inst Pointer to the ADC software instance struct + * \param[in] hw Pointer to the ADC module instance + * \param[in] config Pointer to the configuration struct + * + * \return Status of the initialization procedure. + * \retval STATUS_OK The initialization was successful + * \retval STATUS_ERR_INVALID_ARG Invalid argument(s) were provided + * \retval STATUS_BUSY The module is busy with a reset operation + * \retval STATUS_ERR_DENIED The module is enabled + */ +enum status_code adc_init( + struct adc_module *const module_inst, + Adc *hw, + struct adc_config *config) +{ + /* Sanity check arguments */ + Assert(module_inst); + Assert(hw); + Assert(config); + + /* Associate the software module instance with the hardware module */ + module_inst->hw = hw; + + /* Turn on the digital interface clock */ + system_apb_clock_set_mask(SYSTEM_CLOCK_APB_APBC, PM_APBCMASK_ADC); + + if (hw->CTRLA.reg & ADC_CTRLA_SWRST) { + /* We are in the middle of a reset. Abort. */ + return STATUS_BUSY; + } + + if (hw->CTRLA.reg & ADC_CTRLA_ENABLE) { + /* Module must be disabled before initialization. Abort. */ + return STATUS_ERR_DENIED; + } + + /* Store the selected reference for later use */ + module_inst->reference = config->reference; + + /* Make sure bandgap is enabled if requested by the config */ + if (module_inst->reference == ADC_REFERENCE_INT1V) { + system_voltage_reference_enable(SYSTEM_VOLTAGE_REFERENCE_BANDGAP); + } + +#if ADC_CALLBACK_MODE == true + for (uint8_t i = 0; i < ADC_CALLBACK_N; i++) { + module_inst->callback[i] = NULL; + }; + + module_inst->registered_callback_mask = 0; + module_inst->enabled_callback_mask = 0; + module_inst->remaining_conversions = 0; + module_inst->job_status = STATUS_OK; + + _adc_instances[0] = module_inst; + + if (config->event_action == ADC_EVENT_ACTION_DISABLED && + !config->freerunning) { + module_inst->software_trigger = true; + } else { + module_inst->software_trigger = false; + } +#endif + + /* Write configuration to module */ + return _adc_set_config(module_inst, config); +}