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[modbus] Batch UART reads to reduce loop overhead (#13822)

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This commit is contained in:
J. Nick Koston
2026-02-09 12:21:15 -06:00
committed by GitHub
parent 4a9ff48f02
commit cd55eb927d
1 changed files with 19 additions and 10 deletions
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29
esphome/components/modbus/modbus.cpp
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@@ -19,16 +19,25 @@ void Modbus::setup() {
void Modbus::loop() {
const uint32_t now = App.get_loop_component_start_time();
while (this->available()) {
uint8_t byte;
this->read_byte(&byte);
if (this->parse_modbus_byte_(byte)) {
this->last_modbus_byte_ = now;
} else {
size_t at = this->rx_buffer_.size();
if (at > 0) {
ESP_LOGV(TAG, "Clearing buffer of %d bytes - parse failed", at);
this->rx_buffer_.clear();
// Read all available bytes in batches to reduce UART call overhead.
int avail = this->available();
uint8_t buf[64];
while (avail > 0) {
size_t to_read = std::min(static_cast<size_t>(avail), sizeof(buf));
if (!this->read_array(buf, to_read)) {
break;
}
avail -= to_read;
for (size_t i = 0; i < to_read; i++) {
if (this->parse_modbus_byte_(buf[i])) {
this->last_modbus_byte_ = now;
} else {
size_t at = this->rx_buffer_.size();
if (at > 0) {
ESP_LOGV(TAG, "Clearing buffer of %d bytes - parse failed", at);
this->rx_buffer_.clear();
}
}
}
}