ADC.cpp

00001 /**
00002 * @author Damien Frost
00003 *
00004 * @section LICENSE
00005 *
00006 *   Copyright (c) 2016 Damien Frost
00007 *
00008 *   Permission is hereby granted, free of charge, to any person obtaining a copy
00009 *   of this software and associated documentation files (the "Software"), to deal
00010 *   in the Software without restriction, including without limitation the rights
00011 *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00012 *   copies of the Software, and to permit persons to whom the Software is
00013 *   furnished to do so, subject to the following conditions:
00014 *
00015 *   The above copyright notice and this permission notice shall be included in
00016 *   all copies or substantial portions of the Software.
00017 *
00018 *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00019 *   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00020 *   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00021 *   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00022 *   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00023 *   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
00024 *   THE SOFTWARE.
00025 *
00026 * @file "ADC.cpp"
00027 *
00028 * @section DESCRIPTION
00029 *   Configuration of the ADC for the IoT example.
00030 *
00031 */
00032 
00033 #include "ADC.h "
00034 #include "globals.h "
00035 #include "mbed.h"
00036 
00037 
00038 //#define DEBUG
00039 #define INFOMESSAGES
00040 #define WARNMESSAGES
00041 #define ERRMESSAGES
00042 #define FUNCNAME "ADC"
00043 #include "messages.h"
00044 
00045 
00046 void ConfigureADC(void){
00047     
00048     unsigned int value;
00049     
00050     // ensure power is turned on
00051     // Grabbed from lines 54-57 of analogin_api.c
00052     // This turns on the clock to Ports A, B, and C
00053     RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN | RCC_AHB1ENR_GPIOBEN | RCC_AHB1ENR_GPIOCEN;
00054     // This turns on the clock to the ADC:
00055     RCC->APB2ENR |= RCC_APB2ENR_ADC1EN;
00056     
00057     
00058     // Turn on the ADC:
00059     value = ADC_CR2_ADON;
00060     ADC1->CR2 = value;
00061     wait_us(100);
00062     
00063     // Set the EOC flag at the end of every regular conversion:
00064     ADC1->CR2 |= ADC_CR2_EOCS;
00065     
00066     // Turn on the internal temperature sensor:
00067     ADC->CCR |= ADC_CCR_TSVREFE;
00068     
00069     // Set the first (and only channel) to convert to CH16, the internal temperature sensor:
00070     ADC1->SQR3 |= ADC_SQR3_SQ1_4;
00071     
00072     // Set the sample numbers (making this bigger samples more slowly):
00073     ADC1->SMPR2 = ADC_SMPR1_SMP16_1 | ADC_SMPR1_SMP16_2; // Set for 144 ADC clock cycles
00074     
00075     
00076     INFO("ADC configuration complete!");
00077     DBG("ADC Registers:");
00078     DBG("The SR Register reads: %d", ADC1->SR);
00079     DBG("The CR1 Register reads: %d", ADC1->CR1);
00080     DBG("The CR2 Register reads: %d", ADC1->CR2);
00081     DBG("The JSQR Register reads: %d", ADC1->JSQR);
00082     
00083     return;
00084 }