Donghun Kang / Mbed 2 deprecated 05_DAC_20191104

DonghunKang

Dependencies:   mbed Adafruit_GFX

main.cpp@3:e7cab3f9facb, 2019-11-04 (annotated)

Committer:
eins
Date:
Mon Nov 04 00:31:15 2019 +0000
Revision:
3:e7cab3f9facb
Parent:
2:3061fe655b7d
Child:
4:a37c4436b6eb
made by H. S. Lee. 2019-10-28; DAC Test for F303RE

Who changed what in which revision?

UserRevisionLine numberNew contents of line
eins 3:e7cab3f9facb 1 // made by H. S. Lee. 2019-10-28
eins 3:e7cab3f9facb 2 // DAC Test for F303RE
eins 3:e7cab3f9facb 3
eins 0:46005cfeedb5 4 #include "mbed.h"
eins 0:46005cfeedb5 5 #include "Adafruit_SSD1306.h" // Adafruit_GFX library
eins 0:46005cfeedb5 6
eins 1:ae0b11ca17d1 7 Serial pc(SERIAL_TX, SERIAL_RX);
eins 1:ae0b11ca17d1 8 DigitalOut myled(LED1);
eins 1:ae0b11ca17d1 9 DigitalOut redLed(PA_12);
eins 1:ae0b11ca17d1 10 DigitalIn myButton(PC_13);
eins 1:ae0b11ca17d1 11 DigitalIn exButton(PC_11);
eins 3:e7cab3f9facb 12 AnalogOut myAnalogOut(PA_4);
eins 1:ae0b11ca17d1 13
eins 1:ae0b11ca17d1 14 BusOut my7Seg(PA_8, PA_9, PA_10, PC_9, PC_8, PC_7, PC_6, PA_11); // 8bit data
eins 1:ae0b11ca17d1 15 // LSB, , MSB
eins 1:ae0b11ca17d1 16 char val7Seg[16] = {0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F,
eins 1:ae0b11ca17d1 17 0x77, 0x7C, 0x39, 0x5E, 0x79, 0x71};
eins 1:ae0b11ca17d1 18
eins 1:ae0b11ca17d1 19 char rxData[5];
eins 1:ae0b11ca17d1 20 bool flagRx = 0;
eins 0:46005cfeedb5 21
eins 3:e7cab3f9facb 22 #define TEST2
eins 2:3061fe655b7d 23
eins 2:3061fe655b7d 24 #ifdef TEST1
eins 2:3061fe655b7d 25
eins 2:3061fe655b7d 26 int main(void)
eins 2:3061fe655b7d 27 {
eins 3:e7cab3f9facb 28 pc.baud(115200);
eins 3:e7cab3f9facb 29 pc.puts("\n TESt1: Starting Program \n");
eins 3:e7cab3f9facb 30
eins 2:3061fe655b7d 31 while (1) {
eins 2:3061fe655b7d 32 // change the voltage on the digital output pin by 0.1 * VCC
eins 2:3061fe655b7d 33 // and print what the measured voltage should be (assuming VCC = 3.3v)
eins 2:3061fe655b7d 34 for (float n = 0.0f; n < 1.0f; n += 0.1f) {
eins 2:3061fe655b7d 35 myAnalogOut = n;
eins 2:3061fe655b7d 36 // myAnalogOut.write(n);
eins 3:e7cab3f9facb 37
eins 3:e7cab3f9facb 38 pc.printf("n=%1.2f, output = %1.2f volts\n", n, myAnalogOut.read() * 3.3f);
eins 2:3061fe655b7d 39 // turn on the led if the voltage is greater than 0.5f * VCC
eins 2:3061fe655b7d 40 myled = (myAnalogOut > 0.5f) ? 1 : 0;
eins 2:3061fe655b7d 41 wait(0.1);
eins 2:3061fe655b7d 42 }
eins 2:3061fe655b7d 43 }
eins 2:3061fe655b7d 44 }
eins 2:3061fe655b7d 45 #endif
eins 2:3061fe655b7d 46
eins 2:3061fe655b7d 47 #ifdef TEST2
eins 2:3061fe655b7d 48 Ticker DACtimer;
eins 2:3061fe655b7d 49 bool flagTimer = 0;
eins 2:3061fe655b7d 50
eins 2:3061fe655b7d 51 void DACInt()
eins 2:3061fe655b7d 52 {
eins 2:3061fe655b7d 53 flagTimer = 1;
eins 2:3061fe655b7d 54 }
eins 2:3061fe655b7d 55
eins 2:3061fe655b7d 56 main()
eins 2:3061fe655b7d 57 {
eins 3:e7cab3f9facb 58 pc.baud(115200);
eins 3:e7cab3f9facb 59 pc.puts("\n Test2: Starting Program \n");
eins 3:e7cab3f9facb 60
eins 2:3061fe655b7d 61 // for 10kHz sine wave generation, it's needed to have
eins 2:3061fe655b7d 62 // a sampling frequency in 10 times of that frequency,
eins 2:3061fe655b7d 63 // or 100kHz -> 10us period
eins 3:e7cab3f9facb 64 const float samplingTime = 0.00005;
eins 3:e7cab3f9facb 65
eins 3:e7cab3f9facb 66 DACtimer.attach(&DACInt, samplingTime); // 50us is appropriate for F303RE (20kHz)
eins 3:e7cab3f9facb 67 // DACtimer.attach_us(&DACInt, samplingTime*1000000); // 50us is appropriate for F303RE
eins 3:e7cab3f9facb 68
eins 3:e7cab3f9facb 69 float soundFreq = 1000; // 1kHz = 1000Hz
eins 3:e7cab3f9facb 70 pc.printf("smapling time = %dus, sound frequency = %dHz\n", (int)(samplingTime*1000000), (int)soundFreq);
eins 3:e7cab3f9facb 71
eins 3:e7cab3f9facb 72 unsigned int n = 0;
eins 3:e7cab3f9facb 73 float tempVal;
eins 0:46005cfeedb5 74 while(1)
eins 0:46005cfeedb5 75 {
eins 2:3061fe655b7d 76 if (1 == flagTimer)
eins 2:3061fe655b7d 77 {
eins 3:e7cab3f9facb 78 flagTimer = 0;
eins 3:e7cab3f9facb 79 tempVal = soundFreq*n*samplingTime;
eins 3:e7cab3f9facb 80 myAnalogOut = sin(2*3.14159*tempVal)*0.5+0.5; // an angle is expressed in radians.
eins 3:e7cab3f9facb 81 // myAnalogOut = (sin(2*3.14159*tempVal)+sin(tempVal))*0.25+0.5; // an angle is expressed in radians.
eins 3:e7cab3f9facb 82 if (tempVal > 1.0f) n = 0; // to prevent a phase shift due to overflow of the unsinged int variable
eins 2:3061fe655b7d 83 n++;
eins 2:3061fe655b7d 84 }
eins 2:3061fe655b7d 85 }
eins 2:3061fe655b7d 86 }
eins 2:3061fe655b7d 87 #endif
eins 0:46005cfeedb5 88