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Diff: targets/TARGET_Maxim/TARGET_MAX32630/analogin_api.c
- Revision:
- 157:ff67d9f36b67
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/TARGET_Maxim/TARGET_MAX32630/analogin_api.c Thu Feb 02 17:01:33 2017 +0000 @@ -0,0 +1,96 @@ +/******************************************************************************* + * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved. + * + * 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 MAXIM INTEGRATED 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. + * + * Except as contained in this notice, the name of Maxim Integrated + * Products, Inc. shall not be used except as stated in the Maxim Integrated + * Products, Inc. Branding Policy. + * + * The mere transfer of this software does not imply any licenses + * of trade secrets, proprietary technology, copyrights, patents, + * trademarks, maskwork rights, or any other form of intellectual + * property whatsoever. Maxim Integrated Products, Inc. retains all + * ownership rights. + ******************************************************************************* + */ +#include "mbed_assert.h" +#include "analogin_api.h" +#include "adc.h" +#include "pinmap.h" +#include "PeripheralPins.h" + +#define ADC_FULL_SCALE 0x3FFU +#define INT_FULL_SCALE 0xFFFFU +#define FLOAT_FULL_SCALE 1.0f + +static int initialized = 0; + +//****************************************************************************** +void analogin_init(analogin_t *obj, PinName pin) +{ + // Make sure pin is an analog pin we can use for ADC + MBED_ASSERT((ADCName)pinmap_peripheral(pin, PinMap_ADC) != (ADCName)NC); + + // Set the object pointer and channel encoding + obj->adc = MXC_ADC; + obj->channel = pinmap_find_function(pin, PinMap_ADC); + + if (!initialized) { + MBED_ASSERT(ADC_Init() == E_NO_ERROR); + initialized = 1; + } +} + +//****************************************************************************** +float analogin_read(analogin_t *obj) +{ + uint16_t tmp; + float result; + + // Start conversion with no input scaling and no input buffer bypass + ADC_StartConvert(obj->channel, 1, 0); + + if (ADC_GetData(&tmp) == E_OVERFLOW) { + result = FLOAT_FULL_SCALE; + } else { + result = (float)tmp * (FLOAT_FULL_SCALE / (float)ADC_FULL_SCALE); + } + + return result; +} + +//****************************************************************************** +uint16_t analogin_read_u16(analogin_t *obj) +{ + uint16_t tmp; + uint16_t result; + + // Start conversion with no input scaling and no input buffer bypass + ADC_StartConvert(obj->channel, 1, 0); + + if (ADC_GetData(&tmp) == E_OVERFLOW) { + result = INT_FULL_SCALE; + } else { + result = ((tmp << 6) & 0xFFC0) | ((tmp >> 4) & 0x003F); + } + + return result; +} +