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Diffstat (limited to 'ports/nrf/hal/hal_adc.c')
| -rw-r--r-- | ports/nrf/hal/hal_adc.c | 129 |
1 files changed, 0 insertions, 129 deletions
diff --git a/ports/nrf/hal/hal_adc.c b/ports/nrf/hal/hal_adc.c deleted file mode 100644 index a6cf45391..000000000 --- a/ports/nrf/hal/hal_adc.c +++ /dev/null @@ -1,129 +0,0 @@ -/* - * This file is part of the MicroPython project, http://micropython.org/ - * - * The MIT License (MIT) - * - * Copyright (c) 2017 Glenn Ruben Bakke - * - * Permission is hereby granted, free of charge, to any person obtaining a copy - * of this software and associated documentation files (the "Software"), to deal - * in the Software without restriction, including without limitation the rights - * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell - * copies of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice shall be included in - * all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE - * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, - * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN - * THE SOFTWARE. - */ - -#include <stdio.h> -#include "mphalport.h" -#include "hal_adc.h" - -#ifdef HAL_ADC_MODULE_ENABLED - -#define ADC_REF_VOLTAGE_IN_MILLIVOLTS (1200) // Reference voltage (in milli volts) used by ADC while doing conversion. -#define ADC_PRE_SCALING_COMPENSATION (3) // The ADC is configured to use VDD with 1/3 prescaling as input. And hence the result of conversion is to be multiplied by 3 to get the actual value of the battery voltage. -#define DIODE_FWD_VOLT_DROP_MILLIVOLTS (270) // Typical forward voltage drop of the diode (Part no: SD103ATW-7-F) that is connected in series with the voltage supply. This is the voltage drop when the forward current is 1mA. Source: Data sheet of 'SURFACE MOUNT SCHOTTKY BARRIER DIODE ARRAY' available at www.diodes.com. - -#define ADC_RESULT_IN_MILLI_VOLTS(ADC_VALUE)\ - ((((ADC_VALUE) * ADC_REF_VOLTAGE_IN_MILLIVOLTS) / 255) * ADC_PRE_SCALING_COMPENSATION) - -static const uint32_t hal_adc_input_lookup[] = { - ADC_CONFIG_PSEL_AnalogInput0 << ADC_CONFIG_PSEL_Pos, - ADC_CONFIG_PSEL_AnalogInput1 << ADC_CONFIG_PSEL_Pos, - ADC_CONFIG_PSEL_AnalogInput2 << ADC_CONFIG_PSEL_Pos, - ADC_CONFIG_PSEL_AnalogInput3 << ADC_CONFIG_PSEL_Pos, - ADC_CONFIG_PSEL_AnalogInput4 << ADC_CONFIG_PSEL_Pos, - ADC_CONFIG_PSEL_AnalogInput5 << ADC_CONFIG_PSEL_Pos, - ADC_CONFIG_PSEL_AnalogInput6 << ADC_CONFIG_PSEL_Pos, - ADC_CONFIG_PSEL_AnalogInput7 << ADC_CONFIG_PSEL_Pos -}; - - -static uint8_t battery_level_in_percent(const uint16_t mvolts) -{ - uint8_t battery_level; - - if (mvolts >= 3000) { - battery_level = 100; - } else if (mvolts > 2900) { - battery_level = 100 - ((3000 - mvolts) * 58) / 100; - } else if (mvolts > 2740) { - battery_level = 42 - ((2900 - mvolts) * 24) / 160; - } else if (mvolts > 2440) { - battery_level = 18 - ((2740 - mvolts) * 12) / 300; - } else if (mvolts > 2100) { - battery_level = 6 - ((2440 - mvolts) * 6) / 340; - } else { - battery_level = 0; - } - - return battery_level; -} - -uint16_t hal_adc_channel_value(hal_adc_config_t const * p_adc_conf) { - ADC_BASE->INTENSET = ADC_INTENSET_END_Msk; - ADC_BASE->CONFIG = (ADC_CONFIG_RES_8bit << ADC_CONFIG_RES_Pos) - | (ADC_CONFIG_INPSEL_AnalogInputTwoThirdsPrescaling << ADC_CONFIG_INPSEL_Pos) - | (ADC_CONFIG_REFSEL_VBG << ADC_CONFIG_REFSEL_Pos) - | (hal_adc_input_lookup[p_adc_conf->channel]) - | (ADC_CONFIG_EXTREFSEL_None << ADC_CONFIG_EXTREFSEL_Pos); - - ADC_BASE->EVENTS_END = 0; - ADC_BASE->ENABLE = ADC_ENABLE_ENABLE_Enabled; - - ADC_BASE->EVENTS_END = 0; - ADC_BASE->TASKS_START = 1; - - while (!ADC_BASE->EVENTS_END) { - ; - } - - uint8_t adc_result; - - ADC_BASE->EVENTS_END = 0; - adc_result = ADC_BASE->RESULT; - ADC_BASE->TASKS_STOP = 1; - - return adc_result; -} - -uint16_t hal_adc_battery_level(void) { - ADC_BASE->INTENSET = ADC_INTENSET_END_Msk; - ADC_BASE->CONFIG = (ADC_CONFIG_RES_8bit << ADC_CONFIG_RES_Pos) - | (ADC_CONFIG_INPSEL_SupplyOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos) - | (ADC_CONFIG_REFSEL_VBG << ADC_CONFIG_REFSEL_Pos) - | (ADC_CONFIG_PSEL_Disabled << ADC_CONFIG_PSEL_Pos) - | (ADC_CONFIG_EXTREFSEL_None << ADC_CONFIG_EXTREFSEL_Pos); - - ADC_BASE->EVENTS_END = 0; - ADC_BASE->ENABLE = ADC_ENABLE_ENABLE_Enabled; - - ADC_BASE->EVENTS_END = 0; - ADC_BASE->TASKS_START = 1; - - while (!ADC_BASE->EVENTS_END) { - ; - } - - uint8_t adc_result; - uint16_t batt_lvl_in_milli_volts; - - ADC_BASE->EVENTS_END = 0; - adc_result = ADC_BASE->RESULT; - ADC_BASE->TASKS_STOP = 1; - - batt_lvl_in_milli_volts = ADC_RESULT_IN_MILLI_VOLTS(adc_result) + DIODE_FWD_VOLT_DROP_MILLIVOLTS; - return battery_level_in_percent(batt_lvl_in_milli_volts); -} - -#endif // HAL_ADC_MODULE_ENABLED |