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[ads1115] Add sample rate control (#8102)

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This commit is contained in:
brambo123
2025-01-23 00:31:07 +01:00
committed by GitHub
parent d4857a1727
commit 8aeb08f868
11 changed files with 95 additions and 9 deletions
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63
esphome/components/ads1115/ads1115.cpp
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@@ -9,8 +9,6 @@ static const char *const TAG = "ads1115";
static const uint8_t ADS1115_REGISTER_CONVERSION = 0x00;
static const uint8_t ADS1115_REGISTER_CONFIG = 0x01;
static const uint8_t ADS1115_DATA_RATE_860_SPS = 0b111; // 3300_SPS for ADS1015
void ADS1115Component::setup() {
ESP_LOGCONFIG(TAG, "Setting up ADS1115...");
uint16_t value;
@@ -43,9 +41,9 @@ void ADS1115Component::setup() {
config |= 0b0000000100000000;
}
// Set data rate - 860 samples per second (we're in singleshot mode)
// Set data rate - 860 samples per second
// 0bxxxxxxxx100xxxxx
config |= ADS1115_DATA_RATE_860_SPS << 5;
config |= ADS1115_860SPS << 5;
// Set comparator mode - hysteresis
// 0bxxxxxxxxxxx0xxxx
@@ -77,7 +75,7 @@ void ADS1115Component::dump_config() {
}
}
float ADS1115Component::request_measurement(ADS1115Multiplexer multiplexer, ADS1115Gain gain,
ADS1115Resolution resolution) {
ADS1115Resolution resolution, ADS1115Samplerate samplerate) {
uint16_t config = this->prev_config_;
// Multiplexer
// 0bxBBBxxxxxxxxxxxx
@@ -89,6 +87,11 @@ float ADS1115Component::request_measurement(ADS1115Multiplexer multiplexer, ADS1
config &= 0b1111000111111111;
config |= (gain & 0b111) << 9;
// Sample rate
// 0bxxxxxxxxBBBxxxxx
config &= 0b1111111100011111;
config |= (samplerate & 0b111) << 5;
if (!this->continuous_mode_) {
// Start conversion
config |= 0b1000000000000000;
@@ -101,8 +104,54 @@ float ADS1115Component::request_measurement(ADS1115Multiplexer multiplexer, ADS1
}
this->prev_config_ = config;
// about 1.2 ms with 860 samples per second
delay(2);
// Delay calculated as: ceil((1000/SPS)+.5)
if (resolution == ADS1015_12_BITS) {
switch (samplerate) {
case ADS1115_8SPS:
delay(9);
break;
case ADS1115_16SPS:
delay(5);
break;
case ADS1115_32SPS:
delay(3);
break;
case ADS1115_64SPS:
case ADS1115_128SPS:
delay(2);
break;
default:
delay(1);
break;
}
} else {
switch (samplerate) {
case ADS1115_8SPS:
delay(126); // NOLINT
break;
case ADS1115_16SPS:
delay(63); // NOLINT
break;
case ADS1115_32SPS:
delay(32);
break;
case ADS1115_64SPS:
delay(17);
break;
case ADS1115_128SPS:
delay(9);
break;
case ADS1115_250SPS:
delay(5);
break;
case ADS1115_475SPS:
delay(3);
break;
case ADS1115_860SPS:
delay(2);
break;
}
}
// in continuous mode, conversion will always be running, rely on the delay
// to ensure conversion is taking place with the correct settings