sascha/esphome
1
0
Fork 0
mirror of https://github.com/esphome/esphome.git synced 2026-02-08 00:31:58 +00:00
Code Issues Releases Wiki Activity

[modbus] Batch UART reads to reduce loop overhead

Browse Source
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
Download Patch File Download Diff File Expand all files Collapse all files

31
esphome/components/modbus/modbus.cpp
View File

@@ -19,16 +19,27 @@ 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();
int avail = this->available();
if (avail > 0) {
// Read all available bytes in batches to reduce UART call overhead.
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();
}
}
}
}
}