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stm32/usbd_cdc_interface: Don't reset CDC output buf on initialisation.

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So that characters can be buffered before the USB device is connected
(restoring behviour of the driver before recent state refactoring).
This commit is contained in:
Damien George 2017-10-13 12:00:47 +11:00
parent c59fc1419d
commit 7c7c7b161d
1 changed files with 5 additions and 1 deletions
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6
ports/stm32/usbd_cdc_interface.c
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@ -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;