github/esphome
2
0
Fork 0
mirror of https://github.com/esphome/esphome.git synced 2026-09-11 23:37:34 +00:00
Code Issues Packages Projects Releases Wiki Activity

[modbus] Yield the whole-millisecond part of the interframe wait (#18898)

Browse Source
This commit is contained in:
Bonne Eggleston
2026-08-30 16:43:28 -05:00
committed by GitHub
parent fb65096ea3
commit cb54e57d84
1 changed files with 7 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
esphome/components/modbus/modbus.cpp
+7 -3
View File
@@ -777,9 +777,10 @@ void ModbusServerHub::process_modbus_client_frame_(uint8_t address, uint8_t func
bool Modbus::send_frame_(const ModbusFrame &frame) {
int32_t tx_delay_remaining = this->tx_delay_remaining();
if (tx_delay_remaining > 0) {
// delay() only lands on tick boundaries, so yield with it to get close, then busy-wait the rest.
if (tx_delay_remaining > (int32_t) (2 * US_PER_MS)) {
delay((tx_delay_remaining - US_PER_MS) / US_PER_MS);
// Yield the whole-ms part: delay() never blocks past the request on FreeRTOS, and only slightly
// over elsewhere, which just lengthens the gap. The recompute below makes the remainder exact.
if (tx_delay_remaining >= (int32_t) US_PER_MS) {
delay(tx_delay_remaining / US_PER_MS);
tx_delay_remaining = this->tx_delay_remaining();
}
if (tx_delay_remaining > 0)
@@ -814,6 +815,9 @@ bool Modbus::send_frame_(const ModbusFrame &frame) {
}
void ModbusClientHub::send_next_frame_() {
if (this->tx_buffer_.empty())
return;
if (this->tx_blocked())
return;