diff options
Diffstat (limited to 'src/class/msc/msc_device.h')
| -rw-r--r-- | src/class/msc/msc_device.h | 53 |
1 files changed, 26 insertions, 27 deletions
diff --git a/src/class/msc/msc_device.h b/src/class/msc/msc_device.h index 29acd280a..f2ea256b4 100644 --- a/src/class/msc/msc_device.h +++ b/src/class/msc/msc_device.h @@ -48,6 +48,13 @@ #error CFG_TUD_MSC_EP_BUFSIZE must be defined, value of a block size should work well, the more the better #endif +// Return value of callback functions +enum { + TUD_MSC_RET_BUSY = 0, // Busy, e.g disk I/O is not ready + TUD_MSC_RET_ERROR = -1, + TUD_MSC_RET_ASYNC = -2, // Asynchronous IO +}; + TU_VERIFY_STATIC(CFG_TUD_MSC_EP_BUFSIZE < UINT16_MAX, "Size is not correct"); //--------------------------------------------------------------------+ @@ -57,38 +64,30 @@ TU_VERIFY_STATIC(CFG_TUD_MSC_EP_BUFSIZE < UINT16_MAX, "Size is not correct"); // Set SCSI sense response bool tud_msc_set_sense(uint8_t lun, uint8_t sense_key, uint8_t add_sense_code, uint8_t add_sense_qualifier); +// Called by Application once asynchronous I/O operation is done +// bytes_io is number of bytes in I/O op, typically the bufsize in read/write_cb() or +// TUD_MSC_RET_ERROR (-1) for error. Note TUD_MSC_RET_BUSY (0) will be treated as error as well. +bool tud_msc_async_io_done(int32_t bytes_io, bool in_isr); + //--------------------------------------------------------------------+ // Application Callbacks (WEAK is optional) //--------------------------------------------------------------------+ -// Invoked when received SCSI READ10 command -// - Address = lba * BLOCK_SIZE + offset -// - offset is only needed if CFG_TUD_MSC_EP_BUFSIZE is smaller than BLOCK_SIZE. -// -// - Application fill the buffer (up to bufsize) with address contents and return number of read byte. If -// - read < bufsize : These bytes are transferred first and callback invoked again for remaining data. -// -// - read == 0 : Indicate application is not ready yet e.g disk I/O busy. -// Callback invoked again with the same parameters later on. -// -// - read < 0 : Indicate application error e.g invalid address. This request will be STALLed -// and return failed status in command status wrapper phase. +/* + Invoked when received SCSI READ10/WRITE10 command + - Address = lba * BLOCK_SIZE + offset + - offset is only needed if CFG_TUD_MSC_EP_BUFSIZE is smaller than BLOCK_SIZE. + - Application fill the buffer (up to bufsize) with address contents and return number of bytes read or status. + - 0 < ret < bufsize: These bytes are transferred first and callback will be invoked again for remaining data. + - TUD_MSC_RET_BUSY + Application is buys e.g disk I/O not ready. Callback will be invoked again with the same parameters later on. + - TUD_MSC_RET_ERROR + error such as invalid address. This request will be STALLed and scsi command will be failed + - TUD_MSC_RET_ASYNC + Data I/O will be done asynchronously in a background task. Application should return immediately. + tud_msc_async_io_done() must be called once IO/ is done to signal completion. +*/ int32_t tud_msc_read10_cb (uint8_t lun, uint32_t lba, uint32_t offset, void* buffer, uint32_t bufsize); - -// Invoked when received SCSI WRITE10 command -// - Address = lba * BLOCK_SIZE + offset -// - offset is only needed if CFG_TUD_MSC_EP_BUFSIZE is smaller than BLOCK_SIZE. -// -// - Application write data from buffer to address contents (up to bufsize) and return number of written byte. If -// - write < bufsize : callback invoked again with remaining data later on. -// -// - write == 0 : Indicate application is not ready yet e.g disk I/O busy. -// Callback invoked again with the same parameters later on. -// -// - write < 0 : Indicate application error e.g invalid address. This request will be STALLed -// and return failed status in command status wrapper phase. -// -// TODO change buffer to const uint8_t* int32_t tud_msc_write10_cb (uint8_t lun, uint32_t lba, uint32_t offset, uint8_t* buffer, uint32_t bufsize); // Invoked when received SCSI_CMD_INQUIRY |