diff options
Diffstat (limited to 'examples')
| -rw-r--r-- | examples/device/nrf52840/src/msc_device_app.c | 27 |
1 files changed, 16 insertions, 11 deletions
diff --git a/examples/device/nrf52840/src/msc_device_app.c b/examples/device/nrf52840/src/msc_device_app.c index 96dea077e..916e4331c 100644 --- a/examples/device/nrf52840/src/msc_device_app.c +++ b/examples/device/nrf52840/src/msc_device_app.c @@ -64,8 +64,8 @@ int32_t tud_msc_scsi_cb (uint8_t lun, uint8_t const scsi_cmd[16], void* buffer, { // read10 & write10 has their own callback and MUST not be handled here - void const* ptr = NULL; - uint16_t len = 0; + void const* response = NULL; + uint16_t resplen = 0; // most scsi handled is input bool in_xfer = true; @@ -74,39 +74,44 @@ int32_t tud_msc_scsi_cb (uint8_t lun, uint8_t const scsi_cmd[16], void* buffer, { case SCSI_CMD_TEST_UNIT_READY: // Command that host uses to check our readiness before sending other commands - len = 0; + resplen = 0; break; case SCSI_CMD_PREVENT_ALLOW_MEDIUM_REMOVAL: // Host is about to read/write etc ... better not to disconnect disk - len = 0; + resplen = 0; break; case SCSI_CMD_START_STOP_UNIT: // Host try to eject/safe remove/poweroff us. We could safely disconnect with disk storage, or go into lower power - // scsi_start_stop_unit_t const * cmd_start_stop = (scsi_start_stop_unit_t const *) scsi_cmd - len = 0; + /* scsi_start_stop_unit_t const * start_stop = (scsi_start_stop_unit_t const *) scsi_cmd; + // Start bit = 0 : low power mode, if load_eject = 1 : unmount disk storage as well + // Start bit = 1 : Ready mode, if load_eject = 1 : mount disk storage + start_stop->start; + start_stop->load_eject; + */ + resplen = 0; break; // negative means error -> tusb could stall and/or response with failed status default: return -1; } - // return len must not larger than bufsize - if ( len > bufsize ) len = bufsize; + // return resplen must not larger than bufsize + if ( resplen > bufsize ) resplen = bufsize; - if ( ptr && len ) + if ( response && resplen ) { if(in_xfer) { - memcpy(buffer, ptr, len); + memcpy(buffer, response, resplen); }else { // SCSI output } } - return len; + return resplen; } |