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This commit is contained in:
J. Nick Koston
2025-09-23 22:18:43 -05:00
parent 971931b877
commit efc0d86aa6
1 changed files with 3 additions and 2 deletions
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5
esphome/components/usb_uart/usb_uart.cpp
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@@ -223,8 +223,9 @@ void USBUartComponent::dump_config() {
void USBUartComponent::start_input(USBUartChannel *channel) { void USBUartComponent::start_input(USBUartChannel *channel) {
if (!channel->initialised_.load() || channel->input_started_.load()) if (!channel->initialised_.load() || channel->input_started_.load())
return; return;
// Note: We no longer check ring buffer space here since this may be called from USB task // Note: This function is called from both USB task and main loop, so we cannot
// The lock-free queue provides backpressure instead // directly check ring buffer space here. Backpressure is handled by the chunk pool:
// when exhausted, USB input stops until chunks are freed by the main loop
const auto *ep = channel->cdc_dev_.in_ep; const auto *ep = channel->cdc_dev_.in_ep;
// CALLBACK CONTEXT: This lambda is executed in USB task via transfer_callback // CALLBACK CONTEXT: This lambda is executed in USB task via transfer_callback
auto callback = [this, channel](const usb_host::TransferStatus &status) { auto callback = [this, channel](const usb_host::TransferStatus &status) {