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SignalGenerator.ino
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/*
Author: Kelu124
Copyright 2016
Repo:https://github.com/kelu124/echomods/tree/master/silent
Description: Quick signal emulator for Feather. 70us period. DAC runs at 2MHz
Licence: GNU GPL 2
*/
#include <libmaple/dac.h>
/*
Quick signal emulator for Feather
70us period
*/
const int thisLED_PIN = PA15;
const int TRIG_PIN = PB5;
uint32_t i = 0;
void emulator() {
digitalWrite(thisLED_PIN, HIGH);
uint32_t i = 0;
uint32_t j = 0;
dac_write_channel(DAC, DAC_CH1, 256 + 32);
dac_write_channel(DAC, DAC_CH1, 256 - 32);
for ( i = 128; i > 0; i-- )
{
dac_write_channel(DAC, DAC_CH1, 256 + i);
dac_write_channel(DAC, DAC_CH1, 256 - i);
}
/* Some space */
for ( j = 40; j > 0; j-- )
{
dac_write_channel(DAC, DAC_CH1, 256);
}
dac_write_channel(DAC, DAC_CH1, 256 + 128);
dac_write_channel(DAC, DAC_CH1, 256 - 128);
for ( j = 20; j > 0; j-- )
{
dac_write_channel(DAC, DAC_CH1, 256);
}
dac_write_channel(DAC, DAC_CH1, 256 + 64);
dac_write_channel(DAC, DAC_CH1, 256 - 64);
dac_write_channel(DAC, DAC_CH1, 256 + 64);
dac_write_channel(DAC, DAC_CH1, 256 - 64);
for ( j = 20; j > 0; j-- )
{
dac_write_channel(DAC, DAC_CH1, 256);
}
dac_write_channel(DAC, DAC_CH1, 256 + 32);
dac_write_channel(DAC, DAC_CH1, 256 - 32);
dac_write_channel(DAC, DAC_CH1, 256 + 32);
dac_write_channel(DAC, DAC_CH1, 256 - 32);
dac_write_channel(DAC, DAC_CH1, 256 + 32);
dac_write_channel(DAC, DAC_CH1, 256 - 32);
for ( j = 10; j > 0; j-- )
{
dac_write_channel(DAC, DAC_CH1, 256);
}
dac_write_channel(DAC, DAC_CH1, 256 + 16);
dac_write_channel(DAC, DAC_CH1, 256 - 16);
for ( j = 10; j > 0; j-- )
{
dac_write_channel(DAC, DAC_CH1, 256);
}
dac_write_channel(DAC, DAC_CH1, 256 + 8);
dac_write_channel(DAC, DAC_CH1, 256 - 8);
for ( j = 10; j > 0; j-- )
{
dac_write_channel(DAC, DAC_CH1, 256);
}
dac_write_channel(DAC, DAC_CH1, 256 + 4);
dac_write_channel(DAC, DAC_CH1, 256 - 4);
for ( j = 10; j > 0; j-- )
{
dac_write_channel(DAC, DAC_CH1, 256);
}
dac_write_channel(DAC, DAC_CH1, 256 + 2);
dac_write_channel(DAC, DAC_CH1, 256 - 2);
for ( j = 10; j > 0; j-- )
{
dac_write_channel(DAC, DAC_CH1, 256);
}
dac_write_channel(DAC, DAC_CH1, 256 + 16);
dac_write_channel(DAC, DAC_CH1, 256 - 16);
for ( j = 20; j > 0; j-- )
{
dac_write_channel(DAC, DAC_CH1, 256);
}
digitalWrite(thisLED_PIN, LOW);
}
void setup()
{
dac_enable_channel(DAC, 1); // Configures Pin A4 as DAC1
dac_init(DAC, DAC_CH1); // Start DAC1
dac_write_channel(DAC, DAC_CH1, 256);
pinMode(TRIG_PIN, INPUT_PULLDOWN);
attachInterrupt(TRIG_PIN, emulator, RISING);
}
void loop()
{
/*
We get 128 periods (256+i followed by 256-i) in 70us, that's 1.8 periods per us, so a "slow" signal at nearly 2MHz.
*/
}