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targets/TARGET_Maxim/TARGET_MAX32625/analogin_api.c
- Committer:
- amithy
- Date:
- 2017-11-09
- Revision:
- 178:c26431f84b0d
- Parent:
- 150:02e0a0aed4ec
File content as of revision 178:c26431f84b0d:
/******************************************************************************* * 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, 0, 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, 0, 0); if (ADC_GetData(&tmp) == E_OVERFLOW) { result = INT_FULL_SCALE; } else { result = ((tmp << 6) & 0xFFC0) | ((tmp >> 4) & 0x003F); } return result; }