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LAB 3 DAC
Fork of DACandticker_sample by
main.cpp
- Committer:
- WilliamMarshQMUL
- Date:
- 2017-02-01
- Revision:
- 1:18e0f8aef32f
- Parent:
- 0:5307f49cd305
- Child:
- 2:e27fd3b65155
File content as of revision 1:18e0f8aef32f:
// Lab 3 Example Program 2 // ----------------------- // Periodically write to the AnalogOut to create a sine wave // Alternate between two fixed frequencies every 5 sec // // THIS VERSION HAS NO DEBUGGING CODE #include "mbed.h" #include "rtos.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 ; // this variable is not just for debugging!! 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 Thread::wait(30000) ; // wait 30 sec - 30000ms update_us = 2000 ; // 2ms tick.attach_us(callback(&writeAout), update_us); // setup ticker to write to AnalogOut Thread::wait(30000) ; // wait 30 sec - 30000ms update_us = 1000 ; // 1ms } }