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[cse7766] Batch UART reads to reduce loop overhead

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This commit is contained in:
J. Nick Koston
2026-02-06 22:53:31 +01:00
parent 86f91eed2f
commit e7c9808b87
2 changed files with 21 additions and 11 deletions
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28
esphome/components/cse7766/cse7766.cpp
View File

@@ -7,7 +7,6 @@ namespace esphome {
namespace cse7766 {
static const char *const TAG = "cse7766";
static constexpr size_t CSE7766_RAW_DATA_SIZE = 24;
void CSE7766Component::loop() {
const uint32_t now = App.get_loop_component_start_time();
@@ -16,25 +15,33 @@ void CSE7766Component::loop() {
this->raw_data_index_ = 0;
}
if (this->available() == 0) {
int avail = this->available();
if (avail == 0) {
return;
}
this->last_transmission_ = now;
while (this->available() != 0) {
this->read_byte(&this->raw_data_[this->raw_data_index_]);
// Read all available bytes at once to reduce UART call overhead.
// At 4800 baud (~480 bytes/sec) with ~122 Hz loop rate, typically ~4 bytes per call.
uint8_t buf[CSE7766_RAW_DATA_SIZE];
size_t to_read = std::min(static_cast<size_t>(avail), sizeof(buf));
this->read_array(buf, to_read);
for (size_t i = 0; i < to_read; i++) {
this->raw_data_[this->raw_data_index_] = buf[i];
if (!this->check_byte_()) {
this->raw_data_index_ = 0;
this->status_set_warning();
continue;
}
if (this->raw_data_index_ == 23) {
if (this->raw_data_index_ == CSE7766_RAW_DATA_SIZE - 1) {
this->parse_data_();
this->status_clear_warning();
}
this->raw_data_index_ = (this->raw_data_index_ + 1) % 24;
this->raw_data_index_ = (this->raw_data_index_ + 1) % CSE7766_RAW_DATA_SIZE;
}
}
@@ -53,14 +60,15 @@ bool CSE7766Component::check_byte_() {
return true;
}
if (index == 23) {
if (index == CSE7766_RAW_DATA_SIZE - 1) {
uint8_t checksum = 0;
for (uint8_t i = 2; i < 23; i++) {
for (uint8_t i = 2; i < CSE7766_RAW_DATA_SIZE - 1; i++) {
checksum += this->raw_data_[i];
}
if (checksum != this->raw_data_[23]) {
ESP_LOGW(TAG, "Invalid checksum from CSE7766: 0x%02X != 0x%02X", checksum, this->raw_data_[23]);
if (checksum != this->raw_data_[CSE7766_RAW_DATA_SIZE - 1]) {
ESP_LOGW(TAG, "Invalid checksum from CSE7766: 0x%02X != 0x%02X", checksum,
this->raw_data_[CSE7766_RAW_DATA_SIZE - 1]);
return false;
}
return true;

4
esphome/components/cse7766/cse7766.h
View File

@@ -8,6 +8,8 @@
namespace esphome {
namespace cse7766 {
static constexpr size_t CSE7766_RAW_DATA_SIZE = 24;
class CSE7766Component : public Component, public uart::UARTDevice {
public:
void set_voltage_sensor(sensor::Sensor *voltage_sensor) { voltage_sensor_ = voltage_sensor; }
@@ -33,7 +35,7 @@ class CSE7766Component : public Component, public uart::UARTDevice {
this->raw_data_[start_index + 2]);
}
uint8_t raw_data_[24];
uint8_t raw_data_[CSE7766_RAW_DATA_SIZE];
uint8_t raw_data_index_{0};
uint32_t last_transmission_{0};
sensor::Sensor *voltage_sensor_{nullptr};