Thomas Gartlan
/
DSP1_Timer_ex9_3
Using the Timer to test the maximum speed of the ADC and DAC
main.cpp@1:6bb2d13644e8, 2019-03-27 (annotated)
- Committer:
- tgartlan
- Date:
- Wed Mar 27 10:45:24 2019 +0000
- Revision:
- 1:6bb2d13644e8
- Parent:
- 0:23ff2f1bb142
Using the timer to test the speed of the ADC and DAC first usingfloats, then using integers. ADC looks to be 10 times slower than DAC.; Not sure if experiment is good since no real difference between float and interger for ADC. Time is 20us for both
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
tgartlan | 0:23ff2f1bb142 | 1 | #include "mbed.h" |
tgartlan | 0:23ff2f1bb142 | 2 | Timer t; |
tgartlan | 0:23ff2f1bb142 | 3 | Serial pc(USBTX, USBRX); |
tgartlan | 0:23ff2f1bb142 | 4 | AnalogOut Aout(p18); |
tgartlan | 0:23ff2f1bb142 | 5 | AnalogIn Ain(p20); |
tgartlan | 0:23ff2f1bb142 | 6 | |
tgartlan | 0:23ff2f1bb142 | 7 | DigitalOut myled(LED1); |
tgartlan | 0:23ff2f1bb142 | 8 | |
tgartlan | 0:23ff2f1bb142 | 9 | int main() { |
tgartlan | 0:23ff2f1bb142 | 10 | float value = 0; |
tgartlan | 0:23ff2f1bb142 | 11 | unsigned short value2 = 0; |
tgartlan | 1:6bb2d13644e8 | 12 | //while(1) { |
tgartlan | 0:23ff2f1bb142 | 13 | t.start(); |
tgartlan | 0:23ff2f1bb142 | 14 | pc.printf("Hello World!\n\r"); |
tgartlan | 0:23ff2f1bb142 | 15 | t.stop(); |
tgartlan | 0:23ff2f1bb142 | 16 | pc.printf("time take was %f seconds\n", t.read()); |
tgartlan | 0:23ff2f1bb142 | 17 | t.reset(); |
tgartlan | 0:23ff2f1bb142 | 18 | myled = 1; |
tgartlan | 0:23ff2f1bb142 | 19 | wait(2); |
tgartlan | 0:23ff2f1bb142 | 20 | myled = 0; |
tgartlan | 0:23ff2f1bb142 | 21 | wait(2); |
tgartlan | 1:6bb2d13644e8 | 22 | pc.printf("Testing ADC time with floats!\n\r"); |
tgartlan | 1:6bb2d13644e8 | 23 | t.reset(); |
tgartlan | 1:6bb2d13644e8 | 24 | t.start(); |
tgartlan | 1:6bb2d13644e8 | 25 | value = Ain; |
tgartlan | 1:6bb2d13644e8 | 26 | //value2 = Ain.read_u16(); |
tgartlan | 1:6bb2d13644e8 | 27 | t.stop(); |
tgartlan | 1:6bb2d13644e8 | 28 | pc.printf("ADC took %f seconds when using floats\n", t.read()); |
tgartlan | 1:6bb2d13644e8 | 29 | wait(2); |
tgartlan | 1:6bb2d13644e8 | 30 | myled = 0; |
tgartlan | 1:6bb2d13644e8 | 31 | wait(2); |
tgartlan | 1:6bb2d13644e8 | 32 | pc.printf("Testing ADC time using integers!\n\r"); |
tgartlan | 0:23ff2f1bb142 | 33 | t.reset(); |
tgartlan | 0:23ff2f1bb142 | 34 | t.start(); |
tgartlan | 0:23ff2f1bb142 | 35 | //value = Ain; |
tgartlan | 0:23ff2f1bb142 | 36 | value2 = Ain.read_u16(); |
tgartlan | 0:23ff2f1bb142 | 37 | t.stop(); |
tgartlan | 1:6bb2d13644e8 | 38 | pc.printf("ADC took %f seconds when using integers\n", t.read()); |
tgartlan | 0:23ff2f1bb142 | 39 | wait(2); |
tgartlan | 1:6bb2d13644e8 | 40 | pc.printf("Testing DAC time suing floats!\n\r"); |
tgartlan | 0:23ff2f1bb142 | 41 | t.reset(); |
tgartlan | 0:23ff2f1bb142 | 42 | t.start(); |
tgartlan | 0:23ff2f1bb142 | 43 | Aout =value; |
tgartlan | 0:23ff2f1bb142 | 44 | t.stop(); |
tgartlan | 1:6bb2d13644e8 | 45 | pc.printf("DAC took %f seconds when using floats\n", t.read()); |
tgartlan | 0:23ff2f1bb142 | 46 | wait(2); |
tgartlan | 1:6bb2d13644e8 | 47 | |
tgartlan | 1:6bb2d13644e8 | 48 | pc.printf("Testing DAC time suing integers!\n\r"); |
tgartlan | 1:6bb2d13644e8 | 49 | t.reset(); |
tgartlan | 1:6bb2d13644e8 | 50 | t.start(); |
tgartlan | 1:6bb2d13644e8 | 51 | Aout.write_u16(value2 << 6); |
tgartlan | 1:6bb2d13644e8 | 52 | t.stop(); |
tgartlan | 1:6bb2d13644e8 | 53 | pc.printf("DAC took %f seconds when using integers\n", t.read()); |
tgartlan | 1:6bb2d13644e8 | 54 | wait(2); |
tgartlan | 1:6bb2d13644e8 | 55 | while(1); |
tgartlan | 0:23ff2f1bb142 | 56 | |
tgartlan | 1:6bb2d13644e8 | 57 | //} |
tgartlan | 0:23ff2f1bb142 | 58 | } |