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Lab 3 example 2, no debugging
Fork of DACandticker_sample_with_debug by
DAC Ticker
- Sample code for part 2 of lab 3 using the DAC, called from a Ticker.
- Note that to use AnalogOut from the Ticker (an ISR), we create a version without locking.
main.cpp
- Committer:
- WilliamMarshQMUL
- Date:
- 2019-01-23
- Revision:
- 3:2bf79a3c3cbc
- Parent:
- 2:e27fd3b65155
- Child:
- 4:75ad475aff41
File content as of revision 3:2bf79a3c3cbc:
// Lab 3 Example Program 2 // ----------------------- // Periodically write to the AnalogOut to create a sine wave // Alternate between two fixed frequencies every 5 sec // // Updated for mbed 5 // THIS VERSION HAS NO DEBUGGING CODE #include "mbed.h" #include "sineTable.h" Ticker tick ; // Creates periodic interrupt AnalogOut ao(PTE30) ; // Analog output // Function called periodically // Write new value to AnalogOut volatile int index = 0 ; // index into array of sin values void writeAout() { ao.write_u16(sine[index]) ; index = (index + 1) % 64 ; } // Control the frequency of updates // Alternative between two frequencies int main() { int update_us = 1000 ; // 1ms while (true) { tick.attach_us(callback(&writeAout), update_us); // setup ticker to write to AnalogOut wait(30.0) ; // wait 30 sec update_us = 2000 ; // 2ms tick.attach_us(callback(&writeAout), update_us); // setup ticker to write to AnalogOut wait(30.0) ; // wait 30 sec update_us = 1000 ; // 1ms } }