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Waveform generator added

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This commit is contained in:
Kai Lauterbach 2024-02-11 21:56:13 +01:00
parent 2964460a87
commit 56f8161e99
4 changed files with 43 additions and 22 deletions
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5
firmware/command_ctrl.ino
View file

@ -228,7 +228,8 @@ void cc_startMeasurement()
if (freq < 8000) if (freq < 8000)
{ {
setWaveformFrequency((int)freq); setWaveformFrequency(freq);
setWaveform(WAVEFORM_SINUS);
enableWaveformOutput(); enableWaveformOutput();
si5351.output_enable(SI5351_CLK0, 0); // disable clock output 0 si5351.output_enable(SI5351_CLK0, 0); // disable clock output 0
} else { } else {
@ -305,7 +306,7 @@ void cc_enableClk(void)
{ {
if (start_freq < 8000) if (start_freq < 8000)
{ {
setWaveformFrequency((int)start_freq); setWaveformFrequency(start_freq);
enableWaveformOutput(); enableWaveformOutput();
si5351.output_enable(SI5351_CLK0, 0); si5351.output_enable(SI5351_CLK0, 0);
} else { } else {

4
firmware/firmware.ino
View file

@ -13,6 +13,7 @@
extern "C" { extern "C" {
#include "globals.h" #include "globals.h"
#include "waveforms.h"
} }
/*****************************************************************************/ /*****************************************************************************/
@ -95,7 +96,8 @@ void loop()
pollWaveformGenerator(); pollWaveformGenerator();
//delay(100); //delay(100);
delay(10); //delay(10);
delayMicroseconds(MAIN_LOOP_DELAY_US);
} }
/*****************************************************************************/ /*****************************************************************************/

2
firmware/globals.h
View file

@ -3,6 +3,8 @@
#define MEAS_LOOP_CNT 20 #define MEAS_LOOP_CNT 20
#define MAIN_LOOP_DELAY_US 63 // 1/63us = ~16kHz
/*****************************************************************************/ /*****************************************************************************/
/* Message byte definitions: */ /* Message byte definitions: */

54
firmware/waveformgenerator.ino
View file

@ -1,41 +1,46 @@
#include "Waveforms.h" #include "Waveforms.h"
#define PWM_BIT_WIDTH 10 #define PWM_BIT_WIDTH 8
#define PWM_PIN 5 // PWM-Pin für DAC0 auf dem Arduino Nano 328 #define PWM_PIN 5 // PWM-Pin für DAC0 auf dem Arduino Nano 328
int wf_wave0 = 0; uint8_t wf_wave0 = 0;
int wf_pos = 0; uint8_t wf_pos = 0;
int wf_sample; uint16_t wf_freq = 0;
unsigned long wf_sample_us = 0;
unsigned long wf_prevMicros = 0;
bool wf_outputEnabled = true; // Variable to control waveform output state bool wf_outputEnabled = true; // Variable to control waveform output state
void initWaveformGenerator() void initWaveformGenerator()
{ {
pinMode(PWM_PIN, OUTPUT);
setWaveform(WAVEFORM_SINUS); setWaveform(WAVEFORM_SINUS);
// Call the function to set default frequency, here you might want to specify a default frequency // Call the function to set default frequency, here you might want to specify a default frequency
setWaveformFrequency(WAVEFORM_DEFAULT_FREQ_HZ); setWaveformFrequency(WAVEFORM_DEFAULT_FREQ_HZ);
} }
void setWaveform(int waveform0) void setWaveform(uint8_t waveform0)
{ {
if (waveform0 >= 0 and waveform0 < WAVEFORM_MAXWAVEFORM_NUM) if (waveform0 >= 0 and waveform0 < WAVEFORM_MAXWAVEFORM_NUM)
{ {
// Set default waveforms // Set default waveforms
wf_wave0 = waveform0; wf_wave0 = waveform0;
} else {
wf_wave0 = WAVEFORM_SINUS;
} }
} }
void setWaveformFrequency(int frequency) void setWaveformFrequency(uint16_t frequency)
{ {
if (frequency >= 1 and frequency < 8000) if (frequency >= 1 and frequency < 8000)
{ {
wf_sample = map(frequency, 0, (2^PWM_BIT_WIDTH)-1, 0, WAVEFORM_ONE_HZ_SAMPLE); wf_freq = frequency;
wf_sample = constrain(wf_sample, 0, WAVEFORM_ONE_HZ_SAMPLE);
} else { } else {
wf_sample = map(WAVEFORM_DEFAULT_FREQ_HZ, 0, (2^PWM_BIT_WIDTH)-1, 0, WAVEFORM_ONE_HZ_SAMPLE); wf_freq = WAVEFORM_DEFAULT_FREQ_HZ;
wf_sample = constrain(wf_sample, 0, WAVEFORM_ONE_HZ_SAMPLE);
} }
wf_sample_us = 1000000UL / ((unsigned long)wf_freq * WAVEFORM_MAX_SAMPLES_NUM);
} }
void enableWaveformOutput() void enableWaveformOutput()
@ -50,14 +55,25 @@ void disableWaveformOutput()
void pollWaveformGenerator() void pollWaveformGenerator()
{ {
if (wf_outputEnabled) if (wf_outputEnabled)
{ {
analogWrite(PWM_PIN, waveformsTable[wf_wave0][wf_pos]); // write the selected waveform on DAC0 unsigned long currentMicros = micros(); // Aktuelle Zeit abrufen
if (currentMicros - wf_prevMicros >= wf_sample_us)
wf_pos++; {
if (wf_pos == WAVEFORM_MAX_SAMPLES_NUM) // Reset the counter to repeat the wave wf_prevMicros = currentMicros;
wf_pos = 0;
uint16_t sample = map(waveformsTable[wf_wave0][wf_pos], 0, 0xfff, 0, (1 << PWM_BIT_WIDTH)-1);
delayMicroseconds(wf_sample); // Hold the sample value for the sample time sample = constrain(sample, 0, (1 << PWM_BIT_WIDTH)-1);
analogWrite(PWM_PIN, sample); // write the selected waveform on DAC0
// analogWrite(PWM_PIN, 128); // write the selected waveform on DAC0
wf_pos++;
if (wf_pos == WAVEFORM_MAX_SAMPLES_NUM) // Reset the counter to repeat the wave
wf_pos = 0;
}
} else {
analogWrite(PWM_PIN, 0);
} }
} }