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-rw-r--r--libmaple/usb/stm32f1/usb_reg_map.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/libmaple/usb/stm32f1/usb_reg_map.h b/libmaple/usb/stm32f1/usb_reg_map.h
index ce80842..ea483d2 100644
--- a/libmaple/usb/stm32f1/usb_reg_map.h
+++ b/libmaple/usb/stm32f1/usb_reg_map.h
@@ -377,7 +377,9 @@ static inline uint32* usb_ep_tx_count_ptr(uint8 ep) {
}
static inline uint16 usb_get_ep_tx_count(uint8 ep) {
- return (uint16)*usb_ep_tx_count_ptr(ep);
+ /* FIXME: this is broken somehow; calling it seems to
+ * confuse/crash the chip. */
+ return (uint16)(*usb_ep_tx_count_ptr(ep) & 0x3FF);
}
static inline void usb_set_ep_tx_count(uint8 ep, uint16 count) {