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atmel-samd: Tweak mass storage code to finish read sooner.

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This commit is contained in:
Scott Shawcroft 2017-11-06 16:29:28 -08:00
parent a8ee0012d7
commit 182a946b0e
1 changed files with 3 additions and 4 deletions
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7
ports/atmel-samd/usb_mass_storage.c
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@ -259,6 +259,9 @@ int32_t usb_msc_xfer_done(uint8_t lun) {
if (active_read) {
active_addr += 1;
active_nblocks--;
if (active_nblocks == 0) {
active_read = false;
}
}
if (active_write) {
@ -272,10 +275,6 @@ int32_t usb_msc_xfer_done(uint8_t lun) {
// The start_read callback begins a read transaction which we accept but delay our response until the "main thread" calls usb_msc_background. Once it does, we read immediately from the drive into our cache and trigger the USB DMA to output the sector. Once the sector is transmitted, xfer_done will be called.
void usb_msc_background(void) {
if (active_read && !usb_busy) {
if (active_nblocks == 0) {
active_read = false;
return;
}
fs_user_mount_t * vfs = get_vfs(active_lun);
disk_read(vfs, sector_buffer, active_addr, 1);
// TODO(tannewt): Check the read result.