119 lines
4.7 KiB
C
119 lines
4.7 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2017 Glenn Ruben Bakke
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "mphalport.h"
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#include "hal_adc.h"
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#ifdef HAL_ADCE_MODULE_ENABLED
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static const uint32_t hal_adc_input_lookup_pos[] = {
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SAADC_CH_PSELP_PSELP_AnalogInput0 << SAADC_CH_PSELP_PSELP_Pos,
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SAADC_CH_PSELP_PSELP_AnalogInput1 << SAADC_CH_PSELP_PSELP_Pos,
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SAADC_CH_PSELP_PSELP_AnalogInput2 << SAADC_CH_PSELP_PSELP_Pos,
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SAADC_CH_PSELP_PSELP_AnalogInput3 << SAADC_CH_PSELP_PSELP_Pos,
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SAADC_CH_PSELP_PSELP_AnalogInput4 << SAADC_CH_PSELP_PSELP_Pos,
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SAADC_CH_PSELP_PSELP_AnalogInput5 << SAADC_CH_PSELP_PSELP_Pos,
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SAADC_CH_PSELP_PSELP_AnalogInput6 << SAADC_CH_PSELP_PSELP_Pos,
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SAADC_CH_PSELP_PSELP_AnalogInput7 << SAADC_CH_PSELP_PSELP_Pos
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};
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#define HAL_ADCE_PSELP_NOT_CONNECTED (SAADC_CH_PSELP_PSELP_NC << SAADC_CH_PSELP_PSELP_Pos)
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#define HAL_ADCE_PSELP_VDD (SAADC_CH_PSELP_PSELP_VDD << SAADC_CH_PSELP_PSELP_Pos)
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/*static const uint32_t hal_adc_input_lookup_neg[] = {
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SAADC_CH_PSELN_PSELN_AnalogInput0 << SAADC_CH_PSELN_PSELN_Pos,
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SAADC_CH_PSELN_PSELN_AnalogInput1 << SAADC_CH_PSELN_PSELN_Pos,
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SAADC_CH_PSELN_PSELN_AnalogInput2 << SAADC_CH_PSELN_PSELN_Pos,
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SAADC_CH_PSELN_PSELN_AnalogInput3 << SAADC_CH_PSELN_PSELN_Pos,
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SAADC_CH_PSELN_PSELN_AnalogInput4 << SAADC_CH_PSELN_PSELN_Pos,
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SAADC_CH_PSELN_PSELN_AnalogInput5 << SAADC_CH_PSELN_PSELN_Pos,
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SAADC_CH_PSELN_PSELN_AnalogInput6 << SAADC_CH_PSELN_PSELN_Pos,
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SAADC_CH_PSELN_PSELN_AnalogInput7 << SAADC_CH_PSELN_PSELN_Pos
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};*/
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#define HAL_ADCE_PSELN_NOT_CONNECTED (SAADC_CH_PSELN_PSELN_NC << SAADC_CH_PSELN_PSELN_Pos)
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#define HAL_ADCE_PSELN_VDD (SAADC_CH_PSELN_PSELN_VDD << SAADC_CH_PSELN_PSELN_Pos)
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uint16_t hal_adc_channel_value(hal_adc_config_t const * p_adc_conf) {
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int16_t result = 0;
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// configure to use VDD/4 and gain 1/4
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ADC_BASE->CH[0].CONFIG = (SAADC_CH_CONFIG_GAIN_Gain1_4 << SAADC_CH_CONFIG_GAIN_Pos)
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| (SAADC_CH_CONFIG_MODE_SE << SAADC_CH_CONFIG_MODE_Pos)
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| (SAADC_CH_CONFIG_REFSEL_VDD1_4 << SAADC_CH_CONFIG_REFSEL_Pos)
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| (SAADC_CH_CONFIG_RESN_Bypass << SAADC_CH_CONFIG_RESN_Pos)
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| (SAADC_CH_CONFIG_RESP_Bypass << SAADC_CH_CONFIG_RESP_Pos)
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| (SAADC_CH_CONFIG_TACQ_3us << SAADC_CH_CONFIG_TACQ_Pos);
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// positive input
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ADC_BASE->CH[0].PSELP = hal_adc_input_lookup_pos[p_adc_conf->channel]; // HAL_ADCE_PSELP_VDD;
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ADC_BASE->CH[0].PSELN = HAL_ADCE_PSELN_NOT_CONNECTED;
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ADC_BASE->RESOLUTION = SAADC_RESOLUTION_VAL_8bit << SAADC_RESOLUTION_VAL_Pos;
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ADC_BASE->RESULT.MAXCNT = 1;
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ADC_BASE->RESULT.PTR = (uint32_t)&result;
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ADC_BASE->SAMPLERATE = SAADC_SAMPLERATE_MODE_Task << SAADC_SAMPLERATE_MODE_Pos;
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ADC_BASE->ENABLE = SAADC_ENABLE_ENABLE_Enabled << SAADC_ENABLE_ENABLE_Pos;
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// calibrate ADC
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ADC_BASE->TASKS_CALIBRATEOFFSET = 1;
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while (ADC_BASE->EVENTS_CALIBRATEDONE == 0) {
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;
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}
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ADC_BASE->EVENTS_CALIBRATEDONE = 0;
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while (ADC_BASE->STATUS == (SAADC_STATUS_STATUS_Busy << SAADC_STATUS_STATUS_Pos)) {
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;
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}
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// start the ADC
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ADC_BASE->TASKS_START = 1;
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while (ADC_BASE->EVENTS_STARTED == 0) {
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;
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}
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ADC_BASE->EVENTS_STARTED = 0;
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// sample ADC
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ADC_BASE->TASKS_SAMPLE = 1;
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while (ADC_BASE->EVENTS_END == 0) {
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;
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}
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ADC_BASE->EVENTS_END = 0;
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ADC_BASE->TASKS_STOP = 1;
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while (ADC_BASE->EVENTS_STOPPED == 0) {
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;
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}
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ADC_BASE->EVENTS_STOPPED = 0;
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return result;
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}
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uint16_t hal_adc_battery_level(void) {
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return 0;
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}
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#endif // HAL_ADCE_MODULE_ENABLED
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