/*#############################################################

Program Name    : ex1_analog_single
Author          : Grant Phillips
Date Modified   : 13/01/2016
Compiler        : ARMmbed
Tested On       : STM32F4-Discovery

Description     : Example that measures an analog voltage on 
                  PC1 and displays the result as a 16-bit value 
                  (0-16535), a percentage, and as a voltage (0-3.3V).

                  The output is displayed on a PC using the
                  Serial Wire Viewer (SWV).  See the SWV examples
                  for an explanation of the use of this feature.      

Requirements    : * STM32F4-Discovery Board
              
Circuit         : * a potentiometer (POT) connected to PC1 
                  * A wire link between PB3 and pin6 of the SWD
                    connector (CN2) as explained in the SWV
                    examples section

##############################################################*/

#include "mbed.h"
#include "SWO.h"    

SWO_Channel SWO;    
AnalogIn ain(PC_1);

int main() {
    uint16_t analogval;
    double analogvolt;
    
    while(1) {
        //read the 16-bit value from the analog pin
        analogval = ain.read_u16();                     //the STM32F4-Trainer only supports 12-bit A/D (0 - 4095), but the read_u16 function converts it to a 16-bit value (0 - 65535)
        
        //calculate the voltage from the 16-bit value
        analogvolt = (double)analogval / 65535.0 * 3.3; //cast analogval to a double data type for formula to store result as double
                
        SWO.printf("Analog value: %5d (16-bit)     %4.2f%%     %.2f Volts\n", analogval, ain.read(), analogvolt);
        
        wait(0.01);
    }
}