djsundog/circuitpython
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

atmel-samd: Stop double CSW after MSC reads

Browse Source 
This explicit zero length xfer leads to a second CSW packet. If
another read was started between the two CSWs then the host gets
confused and resets the device.

On reads, the CSW is automatically sent when we reply with the
total length. Writes must do it manually so they can wait for the
disk to flush the data.
This commit is contained in:
Scott Shawcroft 2017-11-03 15:07:41 -07:00
parent e7d6df7f7c
commit 4140b3b944
1 changed files with 0 additions and 1 deletions

1
ports/atmel-samd/usb_mass_storage.c

@ -273,7 +273,6 @@ int32_t usb_msc_xfer_done(uint8_t lun) {
void usb_msc_background(void) { void usb_msc_background(void) {
if (active_read && !usb_busy) { if (active_read && !usb_busy) {
if (active_nblocks == 0) { if (active_nblocks == 0) {
mscdf_xfer_blocks(false, NULL, 0);
active_read = false; active_read = false;
return; return;
} }