B&B Electronics Parallel Printer Card PIOC Manuel d'utilisateur télécharger pdf (Page 58)

GHI Electronics,LLC USBwiz User Manual

USBwiz Boot Loader

8. USBwiz Boot Loader

8.1. General Description

The boot loader is used to update the firmware of USBwiz. The firmware is the code that

sits inside the USBwiz chip and does all the work. When there is a new firmware release,

you can simply download the file from our website and, using simple commands, you can

load it on USBwiz. At power up, USBwiz boot loader takes control and checks the mode

pins (MODE0 and MODE1). If the mode pins are set in firmware interface mode, boot

loader makes a jump to the firmware to start executing immediately. Once the firmware is

executing, a user can access the loader through BL command. BL command is described

in the firmware commands sections.

8.2. Boot Loader Commands

All commands return ‘!‘ followed by the error number, !00 means no error. The boot loader

responds with ‘Wxx(CR)’ on every sector write, where xx is the sector number.

Command Use Notes

R Load and run USBwiz

firmware

If Boot loader returns BL then

reprogramming USBwiz is required

LQUx Load firmware file from

connected media

The x is the drive letter. LQUA will load

the firmware from MMC/SD card,

LQUB will load the firmware from USB

port 0 and LQUC will load it from USB

port 1.

W Write one sector to

internal FLASH

Follow ‘W’ by the sector number then

512 bytes of sector data. Transaction

must be terminated by a checksum

byte. Checksum byte is calculated by

adding all 512 data bytes.

GHI Internal Use

V Returns the loader version

Note: The boot loader is entirely separate program that loads USBwiz firmware. The

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B&B Electronics Parallel Printer Card PIOC Manuel d'utilisateur Page 58