Francesco Orfei
Analog to digital and digital to analog conversion at 8 kHz rate on PA0 (A/D) and PA4 (D/A): use of timers and sleep() (to save energy). On PC8 there's a rising and falling signal to measure the time required by the A/D and D/A interrupt service routine.
Revision 1:a71233fe1e1c, committed 2016-05-04
- Comitter:
- IZ0ABD
- Date:
- Wed May 04 14:50:04 2016 +0000
- Parent:
- 0:57e0a19da71e
- Commit message:
- 2 timers, 8 kHz analog sampling on PA0 and analog output on PA4 + a H-L signal on PC8 to measure the time required by the A/D + D/A conversion.
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed-src.lib | Show annotated file Show diff for this revision Revisions of this file |
--- a/main.cpp Tue Dec 16 13:17:50 2014 +0000
+++ b/main.cpp Wed May 04 14:50:04 2016 +0000
@@ -1,17 +1,37 @@
#include "mbed.h"
Ticker toggle_led_ticker;
+Ticker sampler;
+
+// I/Os
+AnalogIn analog_sample(A0); // Analog IN A0
+AnalogIn threshold_vlaue(A1); // Threshold A1
+AnalogOut my_output(PA_4); // Analog OUT A2
DigitalOut led1(LED1);
+DigitalOut do0(PC_8);
+DigitalOut do1(PC_9);
+
+float analog_value;
+//uint16_t analog_value;
void toggle_led() {
led1 = !led1;
}
+void ADCisr() {
+ do0 = 1;
+ analog_value = analog_sample.read(); // Converts and read the analog input value (value from 0x0000 to 0xFFFF)
+ my_output.write(analog_value);
+}
+
int main() {
// Init the ticker with the address of the function (toggle_led) to be attached and the interval (100 ms)
- toggle_led_ticker.attach(&toggle_led, 0.1);
+ toggle_led_ticker.attach(&toggle_led, 0.5);
+ sampler.attach(&ADCisr, 0.000125); // the address of the function to be attached (&..) and the interval (8 Khz)
while (true) {
// Do other things...
+ do0 = 0;
+ sleep(); // Enter in sleep
}
}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-src.lib Wed May 04 14:50:04 2016 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed-src/#a11c0372f0ba