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improve USB serial Rx speed + make USB serial Tx blocking to avoid overflow

This commit is contained in:
stevstrong 2016-10-12 19:18:38 +02:00
parent 43b3376881
commit 6d4965b5c8
1 changed files with 4 additions and 6 deletions
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10
STM32F1/cores/maple/libmaple/usb/stm32f1/usb_cdcacm.c
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@ -393,15 +393,13 @@ void usb_cdcacm_putc(char ch) {
;
}
/* This function is non-blocking.
/* This function is blocking.
*
* It copies data from a usercode buffer into the USB peripheral TX
* buffer, and returns the number of bytes copied. */
uint32 usb_cdcacm_tx(const uint8* buf, uint32 len) {
/* Last transmission hasn't finished, so abort. */
if (usb_cdcacm_is_transmitting()) {
return 0;
}
while ( usb_cdcacm_is_transmitting()>0 ) ; // wait for end of transmission
/* We can only put USB_CDCACM_TX_EPSIZE bytes in the buffer. */
if (len > USB_CDCACM_TX_EPSIZE) {
@ -451,7 +449,7 @@ uint32 usb_cdcacm_rx(uint8* buf, uint32 len) {
/* If all bytes have been read, re-enable the RX endpoint, which
* was set to NAK when the current batch of bytes was received. */
if (n_unread_bytes <= (CDC_SERIAL_BUFFER_SIZE - USB_CDCACM_RX_EPSIZE)) {
if (n_unread_bytes <=0) {
usb_set_ep_rx_count(USB_CDCACM_RX_ENDP, USB_CDCACM_RX_EPSIZE);
usb_set_ep_rx_stat(USB_CDCACM_RX_ENDP, USB_EP_STAT_RX_VALID);
}
@ -567,7 +565,7 @@ static void vcomDataRxCb(void) {
n_unread_bytes += ep_rx_size;
if (n_unread_bytes <= (CDC_SERIAL_BUFFER_SIZE - USB_CDCACM_RX_EPSIZE)) {
if ( n_unread_bytes<=0 ) {
usb_set_ep_rx_count(USB_CDCACM_RX_ENDP, USB_CDCACM_RX_EPSIZE);
usb_set_ep_rx_stat(USB_CDCACM_RX_ENDP, USB_EP_STAT_RX_VALID);
}