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Limit events processed by tud_task_ext() / tuh_task_ext() #3478

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Limit events processed by tud_task_ext() / tuh_task_ext() #3478

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b73df6c
Limit events processed by tud_task_ext() / tuh_task_ext()
ceedriic Feb 1, 2026
d2f1b18
Actually exit the loop in addition to logging. ENOTENOUGHCOFFEE
ceedriic Feb 1, 2026
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10 changes: 8 additions & 2 deletions src/device/usbd.c
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Original file line number Diff line number Diff line change
Expand Up @@ -666,8 +666,14 @@ void tud_task_ext(uint32_t timeout_ms, bool in_isr) {
return;
}

// Loop until there is no more events in the queue
while (1) {
// Loop until there are no more events in the queue or CFG_TUD_TASK_EVENTS_PER_RUN is reached
for (unsigned epr = 0;; epr++) {
#if CFG_TUD_TASK_EVENTS_PER_RUN > 0
if (epr >= CFG_TUD_TASK_EVENTS_PER_RUN) {
TU_LOG_USBD("USBD event limit (" TU_XSTRING(CFG_TUD_TASK_EVENTS_PER_RUN) ") reached\r\n");
break;
}
#endif
dcd_event_t event;
if (!osal_queue_receive(_usbd_q, &event, timeout_ms)) {
return;
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10 changes: 8 additions & 2 deletions src/host/usbh.c
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Original file line number Diff line number Diff line change
Expand Up @@ -599,8 +599,14 @@ void tuh_task_ext(uint32_t timeout_ms, bool in_isr) {
return;
}

// Loop until there is no more events in the queue
while (1) {
// Loop until there are no more events in the queue or CFG_TUH_TASK_EVENTS_PER_RUN is reached
for (unsigned epr = 0;; epr++) {
#if CFG_TUH_TASK_EVENTS_PER_RUN > 0
if (epr >= CFG_TUH_TASK_EVENTS_PER_RUN) {
TU_LOG_USBH("USBH event limit (" TU_XSTRING(CFG_TUH_TASK_EVENTS_PER_RUN) ") reached\r\n");
break;
}
#endif
hcd_event_t event;
if (!osal_queue_receive(_usbh_q, &event, timeout_ms)) { return; }

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10 changes: 10 additions & 0 deletions src/tusb_option.h
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Original file line number Diff line number Diff line change
Expand Up @@ -560,6 +560,11 @@
#define CFG_TUD_INTERFACE_MAX 16
#endif

// max events processed in one tud_task_ext() call, 0 for unlimited
#ifndef CFG_TUD_TASK_EVENTS_PER_RUN
#define CFG_TUD_TASK_EVENTS_PER_RUN 16
#endif

// default to max hardware endpoint, but can be smaller to save RAM
#ifndef CFG_TUD_ENDPPOINT_MAX
#define CFG_TUD_ENDPPOINT_MAX TUP_DCD_ENDPOINT_MAX
Expand Down Expand Up @@ -679,6 +684,11 @@
#define CFG_TUH_MEM_DCACHE_LINE_SIZE CFG_TUSB_MEM_DCACHE_LINE_SIZE
#endif

// max events processed in one tuh_task_ext() call, 0 for unlimited
#ifndef CFG_TUH_TASK_EVENTS_PER_RUN
#define CFG_TUH_TASK_EVENTS_PER_RUN 16
#endif

//------------- CLASS -------------//

#ifndef CFG_TUH_HUB
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