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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).
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;