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[modbus] Batch UART reads to reduce loop overhead

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This commit is contained in:
J. Nick Koston
2026-02-06 23:59:38 +01:00
parent 86f91eed2f
commit f19bb2cd0a
1 changed files with 21 additions and 10 deletions
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31
esphome/components/modbus/modbus.cpp
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@@ -19,16 +19,27 @@ void Modbus::setup() {
void Modbus::loop() { void Modbus::loop() {
const uint32_t now = App.get_loop_component_start_time(); const uint32_t now = App.get_loop_component_start_time();
while (this->available()) { int avail = this->available();
uint8_t byte; if (avail > 0) {
this->read_byte(&byte); // Read all available bytes in batches to reduce UART call overhead.
if (this->parse_modbus_byte_(byte)) { uint8_t buf[64];
this->last_modbus_byte_ = now; while (avail > 0) {
} else { size_t to_read = std::min(static_cast<size_t>(avail), sizeof(buf));
size_t at = this->rx_buffer_.size(); if (!this->read_array(buf, to_read)) {
if (at > 0) { break;
ESP_LOGV(TAG, "Clearing buffer of %d bytes - parse failed", at); }
this->rx_buffer_.clear(); 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();
}
}
} }
} }
} }