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 /ports/stm32 | |
| 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).
Diffstat (limited to 'ports/stm32')
| -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; |