NTHU_Racing / Mbed 2 deprecated Practice_4_example

For NTHU_Racing MCU tutorial Learn to use Serial Oscilloscope & analog pin

Dependencies:   mbed

Fork of Practice_3_example by NTHU_Racing

main.cpp@2:04dde3a9d171, 2017-01-20 (annotated)

Committer:
open4416
Date:
Fri Jan 20 13:44:57 2017 +0000
Revision:
2:04dde3a9d171
Parent:
sample_timebase.cpp@1:5968363c5d23 
For NTHU_Racing MCU tutorial

Who changed what in which revision?

UserRevisionLine numberNew contents of line
open4416 0:d68e088dfbcd 1 #include "mbed.h"
open4416 2:04dde3a9d171 2 #define pi 3.141592f
open4416 2:04dde3a9d171 3 #define d2r 0.01745329f
open4416 0:d68e088dfbcd 4
open4416 0:d68e088dfbcd 5 //~~~~~~~~~~~~~~~~~~~~~~~~~~~GPIO registor~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
open4416 2:04dde3a9d171 6 AnalogIn adc = A0; //analog reading
open4416 2:04dde3a9d171 7 Serial pc(D1, D0); //Serial reg
open4416 2:04dde3a9d171 8 PwmOut led = D13; //link leg
open4416 2:04dde3a9d171 9 AnalogOut dac = A2; //Note!!! Only for F446re, not aviable for MCU without DAC
open4416 0:d68e088dfbcd 10 //~~~~~~~~~~~~~~~~~~~~~~~~~~~end of GPIO registor~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
open4416 0:d68e088dfbcd 11
open4416 0:d68e088dfbcd 12
open4416 0:d68e088dfbcd 13 //~~~~~~~~~~~~~~~~~~~~~~~~~~~Varible registor~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
open4416 1:5968363c5d23 14 Ticker TT1; //call a timer
open4416 2:04dde3a9d171 15 int TimeCount = 0; //work as a clock
open4416 2:04dde3a9d171 16 float SignalGenValue = 0.0f; //value for DAC or PWM reference
open4416 2:04dde3a9d171 17 float SignalProbeValue = 0.0f; //value for ADC readed
open4416 0:d68e088dfbcd 18 //~~~~~~~~~~~~~~~~~~~~~~~~~~~end of Varible registor~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
open4416 0:d68e088dfbcd 19
open4416 0:d68e088dfbcd 20
open4416 0:d68e088dfbcd 21 //~~~~~~~~~~~~~~~~~~~~~~~~~~~Function registor~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
open4416 0:d68e088dfbcd 22 void init_IO(); //initialize IO state
open4416 0:d68e088dfbcd 23 void init_TIMER(); //set TT_main{} rate
open4416 1:5968363c5d23 24 void TT1_main(); //timebase function rated by TT1
open4416 0:d68e088dfbcd 25 //~~~~~~~~~~~~~~~~~~~~~~~~~~~end of Function registor~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
open4416 0:d68e088dfbcd 26
open4416 0:d68e088dfbcd 27
open4416 0:d68e088dfbcd 28 //~~~~~~~~~~~~~~~~~~~~~~~~~~~main funtion~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
open4416 0:d68e088dfbcd 29 int main()
open4416 0:d68e088dfbcd 30 {
open4416 0:d68e088dfbcd 31 init_IO(); //initialized value
open4416 1:5968363c5d23 32 init_TIMER(); //initialized Timer Inturrupt rate
open4416 0:d68e088dfbcd 33
open4416 0:d68e088dfbcd 34 while(1) { //main() loop
open4416 0:d68e088dfbcd 35 }
open4416 0:d68e088dfbcd 36 }
open4416 0:d68e088dfbcd 37 //~~~~~~~~~~~~~~~~~~~~~~~~~~~end of main funtion~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
open4416 0:d68e088dfbcd 38
open4416 0:d68e088dfbcd 39
open4416 0:d68e088dfbcd 40 //~~~~~~~~~~~~~~~~~~~~~~~~~~~init_IO funtion~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
open4416 0:d68e088dfbcd 41 void init_IO(void) //initialize
open4416 0:d68e088dfbcd 42 {
open4416 2:04dde3a9d171 43 led = 0.0f;
open4416 2:04dde3a9d171 44 dac = 0.0f;
open4416 2:04dde3a9d171 45 pc.baud(115200); //set baud rate
open4416 0:d68e088dfbcd 46 }
open4416 0:d68e088dfbcd 47 //~~~~~~~~~~~~~~~~~~~~~~~~~~~end of init_IO funtion~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
open4416 0:d68e088dfbcd 48
open4416 0:d68e088dfbcd 49
open4416 0:d68e088dfbcd 50
open4416 0:d68e088dfbcd 51 //~~~~~~~~~~~~~~~~~~~~~~~~~~~Timebase funtion~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
open4416 1:5968363c5d23 52 void init_TIMER() //set TTx_main{} rate
open4416 0:d68e088dfbcd 53 {
open4416 2:04dde3a9d171 54 TT1.attach_us(&TT1_main, 20000); //0.02 sec
open4416 0:d68e088dfbcd 55 }
open4416 0:d68e088dfbcd 56
open4416 1:5968363c5d23 57 void TT1_main() //interrupt function by TT1
open4416 0:d68e088dfbcd 58 {
open4416 2:04dde3a9d171 59 //generator time reference
open4416 2:04dde3a9d171 60 TimeCount = TimeCount + 1;
open4416 2:04dde3a9d171 61 if(TimeCount > 50) {
open4416 2:04dde3a9d171 62 TimeCount=0;
open4416 2:04dde3a9d171 63 }
open4416 2:04dde3a9d171 64
open4416 2:04dde3a9d171 65 //start generating signal output
open4416 2:04dde3a9d171 66 SignalGenValue = pow(sin(pi*TimeCount/50.0f),2);
open4416 2:04dde3a9d171 67 dac = SignalGenValue; //Note!!! Only for F446re, not aviable for MCU without DAC
open4416 2:04dde3a9d171 68 led = SignalGenValue; //only for you to see directly from eyes
open4416 2:04dde3a9d171 69
open4416 2:04dde3a9d171 70 //start reading analog signal
open4416 2:04dde3a9d171 71 SignalProbeValue = adc.read(); //acquire analog data
open4416 2:04dde3a9d171 72
open4416 2:04dde3a9d171 73 //print out data
open4416 2:04dde3a9d171 74 pc.printf("%.2f\r", SignalProbeValue); //transfer data to PC
open4416 0:d68e088dfbcd 75 }
open4416 0:d68e088dfbcd 76 //~~~~~~~~~~~~~~~~~~~~~~~~~~~end of Timebase funtion~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//