diff options
Diffstat (limited to 'libmaple/usb/stm32f1')
| -rw-r--r-- | libmaple/usb/stm32f1/usb_cdcacm.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/libmaple/usb/stm32f1/usb_cdcacm.c b/libmaple/usb/stm32f1/usb_cdcacm.c index cdcba9c..3f3a493 100644 --- a/libmaple/usb/stm32f1/usb_cdcacm.c +++ b/libmaple/usb/stm32f1/usb_cdcacm.c @@ -267,6 +267,8 @@ static volatile uint8 vcomBufferRx[USB_CDCACM_RX_EPSIZE]; static volatile uint32 rx_offset = 0; /* Number of bytes left to transmit */ static volatile uint32 n_unsent_bytes = 0; +/* Are we currently sending an IN packet? */ +static volatile uint8 transmitting = 0; /* Number of unread bytes */ static volatile uint32 n_unread_bytes = 0; @@ -407,6 +409,13 @@ uint32 usb_cdcacm_tx(const uint8* buf, uint32 len) { usb_set_ep_tx_count(USB_CDCACM_TX_ENDP, len); n_unsent_bytes = len; usb_set_ep_tx_stat(USB_CDCACM_TX_ENDP, USB_EP_STAT_TX_VALID); + transmitting = 1; + } else { + usb_set_ep_tx_count(USB_CDCACM_TX_ENDP, 0); + usb_set_ep_tx_stat(USB_CDCACM_TX_ENDP, USB_EP_STAT_TX_VALID); + // actually block here waiting for interrupt, even though we sent 0 bytes + n_unsent_bytes = 0; + transmitting = 1; } return len; @@ -416,7 +425,11 @@ uint32 usb_cdcacm_data_available(void) { return n_unread_bytes; } -uint16 usb_cdcacm_get_pending() { +uint8 usb_cdcacm_is_transmitting(void) { + return transmitting; +} + +uint16 usb_cdcacm_get_pending(void) { return n_unsent_bytes; } @@ -497,12 +510,8 @@ int usb_cdcacm_get_n_data_bits(void) { */ static void vcomDataTxCb(void) { - /* The following assumes that all of the bytes we copied during - * the last call to usb_cdcacm_tx were sent during the IN - * transaction (this seems to be the case). */ - /* TODO find out why this is broken: - * n_unsent_bytes = usb_get_ep_tx_count(USB_CDCACM_TX_ENDP); */ n_unsent_bytes = 0; + transmitting = 0; } static void vcomDataRxCb(void) { |