atmel-samd: Turn off nvmctl cache and rework active_read.

tannewt · tannewt · commit ef9a7f262a92 · 2017-11-08T16:01:38.000-08:00
diff --git a/ports/atmel-samd/asf4_conf/samd51/hpl_nvmctrl_config.h b/ports/atmel-samd/asf4_conf/samd51/hpl_nvmctrl_config.h
@@ -19,14 +19,14 @@
 // <i> Indicate whether AHB0 cache is disable or not
 // <id> nvm_arch_cache0
 #ifndef CONF_NVM_CACHE0
-#define CONF_NVM_CACHE0 0
+#define CONF_NVM_CACHE0 1
 #endif
 
 // <q> AHB1 Cache Disable
 // <i> Indicate whether AHB1 cache is disable or not
 // <id> nvm_arch_cache1
 #ifndef CONF_NVM_CACHE1
-#define CONF_NVM_CACHE1 0
+#define CONF_NVM_CACHE1 1
 #endif
 
 // </h>
diff --git a/ports/atmel-samd/usb_mass_storage.c b/ports/atmel-samd/usb_mass_storage.c
@@ -260,9 +260,6 @@ 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) {
@@ -277,6 +274,10 @@ 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);
         CRITICAL_SECTION_ENTER();
