klaute/ESP32_Scope
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Compare commits

base: klaute:a11a75a2c5f7fb11e86c0b8605eed4193fefb3ea
Branches Tags
klaute:develop
..
compare: klaute:0626bce3b3e9ee86a0c189985c8cc8b8dd32d1f0
Branches Tags
klaute:develop

No commits in common. "a11a75a2c5f7fb11e86c0b8605eed4193fefb3ea" and "0626bce3b3e9ee86a0c189985c8cc8b8dd32d1f0" have entirely different histories.
a11a75a2c5 ... 0626bce3b3

3 changed files with 153 additions and 155 deletions
Show stats Expand all files Collapse all files

1
ESP32_Oscilloscope/ESP32_Oscilloscope.ino
View file

@ -210,7 +210,6 @@ void core1_task(void *pvParameters)
{
if (stop_change)
{
// TODO the enable function causes an esp32 deadlock
//i2s_adc_enable(I2S_NUM_0);
i2s_zero_dma_buffer(I2S_NUM_0);
stop_change = false;

53
ESP32_Oscilloscope/data_analysis.ino
View file

@ -78,15 +78,20 @@ void trigger_freq_analog(uint16_t *i2s_buffer,
uint32_t trigger_index = 0;
// get initial signal relative to the mean
bool previous_signal_side = (to_voltage(i2s_buffer[0]) > mean);
if (to_voltage(i2s_buffer[0]) > mean)
{
signal_side = true;
}
// waveform repetitions calculation + get triggers time
uint32_t wave_center = (max_v + min_v) / 2;
for (uint32_t i = 1; i < BUFF_SIZE; i++)
{
bool current_signal_side = (to_voltage(i2s_buffer[i]) > mean);
if (previous_signal_side && !current_signal_side)
if (signal_side && i2s_buffer[i] < wave_center - (wave_center - min_v) * 0.2)
{
signal_side = false;
}
else if (!signal_side && i2s_buffer[i] > wave_center + (max_v - wave_center) * 0.2)
{
freq++;
if (trigger_count < trigger_num)
@ -94,19 +99,10 @@ void trigger_freq_analog(uint16_t *i2s_buffer,
trigger_temp[trigger_count] = i;
trigger_count++;
}
} else if (!previous_signal_side && current_signal_side)
{
freq++;
if (trigger_count < trigger_num)
{
trigger_temp[trigger_count] = i;
trigger_count++;
signal_side = true;
}
}
previous_signal_side = current_signal_side;
}
// frequency calculation
if (trigger_count < 2)
{
@ -176,6 +172,7 @@ void trigger_freq_digital(uint16_t *i2s_buffer,
float *pt_period,
uint32_t *pt_trigger0)
{
float freq = 0;
float period = 0;
bool signal_side = false;
@ -185,7 +182,10 @@ void trigger_freq_digital(uint16_t *i2s_buffer,
uint32_t trigger_index = 0;
// get initial signal relative to the mean
bool previous_signal_side = (to_voltage(i2s_buffer[0]) > mean);
if (to_voltage(i2s_buffer[0]) > mean)
{
signal_side = true;
}
// waveform repetitions calculation + get triggers time
uint32_t wave_center = (max_v + min_v) / 2;
@ -194,37 +194,38 @@ void trigger_freq_digital(uint16_t *i2s_buffer,
{
for (uint32_t i = 1; i < BUFF_SIZE; i++)
{
bool current_signal_side = (to_voltage(i2s_buffer[i]) > mean);
if (previous_signal_side && !current_signal_side)
if (signal_side && i2s_buffer[i] < wave_center - (wave_center - min_v) * 0.2)
{
// signal was high, fell -> trigger if normal high
if (trigger_count < trigger_num && normal_high)
{
trigger_temp[trigger_count] = i;
trigger_count++;
}
signal_side = false;
}
else if (!previous_signal_side && current_signal_side)
else if (!signal_side && i2s_buffer[i] > wave_center + (max_v - wave_center) * 0.2)
{
freq++;
// signal was low, rose -> trigger if normal low
if (trigger_count < trigger_num && !normal_high)
{
trigger_temp[trigger_count] = i;
trigger_count++;
}
signal_side = true;
}
}
previous_signal_side = current_signal_side;
}
// frequency calculation
if (trigger_count > 1)
{
// simple frequency calculation fair enough for frequencies over 2khz (20hz resolution)
freq = freq * 1000 / 50;
period = (float)(sample_rate * 1000.0) / freq; // us
if (trigger_count > 1)
{
// from 2000 to 80 hz -> uses mean of the periods for precision
if (freq < 2000 && freq > 80)
{

6
ESP32_Oscilloscope/i2s.ino
View file

@ -32,11 +32,9 @@ void ADC_Sampling(uint16_t *i2s_buff){
}
*/
void ADC_Sampling(uint16_t *i2s_buff){
size_t bytes_read;
for (int i = 0; i < B_MULT; i++) {
size_t bytes_read; for (int i = 0; i < B_MULT; i++) {
i2s_read(I2S_NUM_0, (void*)&i2s_buff[i * NUM_SAMPLES], NUM_SAMPLES * sizeof(uint16_t), &bytes_read, portMAX_DELAY);
for(size_t ix = 0; ix < bytes_read/2; ix++)
i2s_buff[(i * NUM_SAMPLES) + ix] &= 0x0FFF; // 16bit to 12bit conversion 
for(size_t ix = 0; ix < bytes_read/2; ix++) i2s_buff[(i * NUM_SAMPLES) + ix] &= 0x0FFF; // 16bit to 12bit conversion 
}
}