stmhal: Fix bug with USB CDC transmit buffer wrap around.

2014-03-24 12:23:03 +00:00 · 2014-03-24 12:23:03 +00:00 · 2f8beb8d88
parent a82d7ef29d
commit 2f8beb8d88
1 changed files with 1 additions and 1 deletions
--- a/stmhal/usbd_cdc_interface.c
+++ b/stmhal/usbd_cdc_interface.c
@ -363,7 +363,7 @@ void USBD_CDC_SetInterrupt(int chr, void *data) {
 void USBD_CDC_Tx(const char *str, uint32_t len) {
    for (int i = 0; i < len; i++) {
        uint timeout = 200;
-        while (UserTxBufPtrIn + 1 == UserTxBufPtrOut) {
+        while (((UserTxBufPtrIn + 1) & (APP_TX_DATA_SIZE - 1)) == UserTxBufPtrOut) {
            if (timeout-- == 0) {
                break;
            }