main.cpp

00001 /******************************************************************************
00002 * MIT License
00003 *
00004 * Copyright (c) 2017 Justin J. Jordan
00005 *
00006 * Permission is hereby granted, free of charge, to any person obtaining a copy
00007 * of this software and associated documentation files (the "Software"), to deal
00008 * in the Software without restriction, including without limitation the rights
00009 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00010 * copies of the Software, and to permit persons to whom the Software is
00011 * furnished to do so, subject to the following conditions:
00012  
00013 * The above copyright notice and this permission notice shall be included in all
00014 * copies or substantial portions of the Software.
00015  
00016 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00017 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00018 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00019 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00020 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00021 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
00022 * SOFTWARE.
00023 ******************************************************************************/
00024 
00025 
00026 //Demo uses pot connected between 3.3 and GND with wiper on AIN_0.
00027 //SQWV is generated on P4_0
00028 
00029 
00030 #include "mbed.h"
00031 #include "max32630fthr.h"
00032 #include "adc.h"
00033 
00034 
00035 int main()
00036 {
00037     MAX32630FTHR pegasus(MAX32630FTHR::VIO_3V3);
00038     
00039     MBED_ASSERT(ADC_Init() == E_NO_ERROR);
00040     
00041     //Init pwm signal
00042     PwmOut pwmOut(P4_0);
00043     pwmOut.write(0.5F);
00044     
00045     uint16_t rawADCdata;
00046     float volts = 0.0F;
00047     float period = 0.0F;
00048     
00049     pwmOut.period(period);
00050     
00051     printf("\033[H");  //home
00052     printf("\033[0J"); //erase from cursor to end of screen
00053     
00054     //loop
00055     while(1)
00056     {   
00057         //Do ADC conversion
00058         ADC_StartConvert(ADC_CH_0_DIV_5, 1, 1);
00059         ADC_GetData(&rawADCdata);
00060         
00061         //Get ADC value in volts
00062         volts = ((6.0F * rawADCdata) / 1023.0F);
00063         
00064         //convert to period in seconds for pwm
00065         period = (1.0F / ((300.0F * volts) + 10.0F));
00066         
00067         //Update sqwv period
00068         pwmOut.period(period);
00069         pwmOut.write(0.5F);
00070         
00071         //Display data
00072         printf("Raw Data = 0x%04x\r\n", rawADCdata);
00073         printf("Volts    = %3.2f\r\n", volts);
00074         printf("Period   = %5.4f\r\n", period);
00075         printf("\033[H");  //home
00076         
00077         wait(0.1F);
00078     }
00079 }