DekTec DTM-3237 DVB-S2 Receiver - Manual (Page 26)

DTM-3237 – OEM DVB-S2 Receiver with DVB-ASI Output
User Manual
26
4.6.3 Firmware upload - Example
In the example below the DTM-3237 is upgraded with new firmware over USB. The size of the firmware
file is 486400 bytes. Over USB, each packet can hold a maximum of 250 data bytes, so the number
of ‘file parts’ will 1946. The first 1945 file parts will contain 250 data bytes and the last part will
contain 150 data bytes. The table below shows the actions required to perform this firmware upgrade.
Action Setting R/W Idx Comment
Switch mode to 1 0x85, 0x01 W 0 Switch to firmware-upgrade mode
Close USB interface USB only
Wait 3s
Reconnect USB i/f USB only
Read mode 0x85, 0x01 R 0 Verify that mode is firmware-upgrade
mode (1)
Erase 0x85, 0x02 W 0 The DTM-3237 needs ±3.5 seconds
processing time to erase the firmware
File part* 0x85, 0x03 W 1
File part 0x85, 0x03 W 2
: : 0x85, 0x03 W : :
File part 0x85, 0x03 W 1946
Verify 0x85, 0x04 R 0 We expect to read 1 (=firmware
uploaded correctly)
Switch mode to 0 0x85, 0x01 W 0 Switch to normal mode
Close USB interface USB only
Wait 10s
Reconnect USB i/f USB only
Read mode 0x85, 0x01 R 0 Verify that mode is normal (0)
* For USB, data is encoded as described in §4.6.2. For LVTTL serial control port the same encoding is
used. For I 2 C, data bytes are packaged without conversion in I 2 C write message.