diff options
| author | Damien George <damien.p.george@gmail.com> | 2017-10-13 12:00:47 +1100 |
|---|---|---|
| committer | Damien George <damien.p.george@gmail.com> | 2017-10-13 12:00:47 +1100 |
| commit | 7c7c7b161df5be99aee9dea444b6e4beacf78438 (patch) | |
| tree | ed285d1cd3895868b0db5894641823ed8d5ae6a8 | |
| parent | c59fc1419d5760d7be0bcad1ebdfb70b43fe7093 (diff) | |
stm32/usbd_cdc_interface: Don't reset CDC output buf on initialisation.
So that characters can be buffered before the USB device is connected
(restoring behviour of the driver before recent state refactoring).
| -rw-r--r-- | ports/stm32/usbd_cdc_interface.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/ports/stm32/usbd_cdc_interface.c b/ports/stm32/usbd_cdc_interface.c index 4c49c9321..2e9fba917 100644 --- a/ports/stm32/usbd_cdc_interface.c +++ b/ports/stm32/usbd_cdc_interface.c @@ -57,10 +57,14 @@ #define CDC_SEND_BREAK 0x23 uint8_t *usbd_cdc_init(usbd_cdc_itf_t *cdc, usbd_cdc_msc_hid_state_t *usbd) { + // Link the parent state cdc->usbd = usbd; + + // Reset all the CDC state + // Note: we don't reset tx_buf_ptr_in in order to allow the output buffer to + // be filled (by usbd_cdc_tx_always) before the USB device is connected. cdc->rx_buf_put = 0; cdc->rx_buf_get = 0; - cdc->tx_buf_ptr_in = 0; cdc->tx_buf_ptr_out = 0; cdc->tx_buf_ptr_out_shadow = 0; cdc->tx_buf_ptr_wait_count = 0; |