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esp32/usb: Wake main thread when USB receives data. 

This improves (decreases) the latency on stdin, on SoCs with built-in USB
and using TinyUSB, like S2 and S3.

Signed-off-by: Andrew Leech <andrew.leech@planetinnovation.com.au>
This commit is contained in:
Andrew Leech 2023-11-01 11:06:10 +11:00 committed by Damien George
parent d8a263435f
commit 06a7bf967c
1 changed files with 4 additions and 1 deletions
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5
ports/esp32/usb.c
View File

@ -40,8 +40,10 @@
static uint8_t usb_rx_buf[CONFIG_TINYUSB_CDC_RX_BUFSIZE];
// This is called from FreeRTOS task "tusb_tsk" in espressif__esp_tinyusb (not an ISR).
static void usb_callback_rx(int itf, cdcacm_event_t *event) {
// TODO: what happens if more chars come in during this function, are they lost?
// espressif__esp_tinyusb places tinyusb rx data onto freertos ringbuffer which
// this function forwards onto our stdin_ringbuf.
for (;;) {
size_t len = 0;
esp_err_t ret = tinyusb_cdcacm_read(itf, usb_rx_buf, sizeof(usb_rx_buf), &len);
@ -58,6 +60,7 @@ static void usb_callback_rx(int itf, cdcacm_event_t *event) {
ringbuf_put(&stdin_ringbuf, usb_rx_buf[i]);
}
}
mp_hal_wake_main_task();
}
}