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karosium / smbusb

USB SMBus Interface
GNU Lesser General Public License v2.1
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I am using degilent jtag usb cable,can it be supportted? #20

Closed youxiaojie closed 4 years ago

youxiaojie commented 4 years ago

https://github.com/mithro/ixo-usb-jtag I am using degilent jtag usb cable,can it be supportted?

karosium commented 4 years ago

If the cable uses the FX2 chip it should work.

The required lines won't be on the JTAG connector so you'll have to solder additional wires to the board and you'll also have to run smbusb_bootstrap with the digilent VID/PID every time you connect the cable (the other tools should work as-is after that.)

Good luck

youxiaojie commented 4 years ago

what is wire connexion between usb and fx2 and fx2 to i2c?

karosium commented 4 years ago

I'm not sure what you mean by "between usb and fx2". If your Digilent cable works with https://github.com/mithro/ixo-usb-jtag then it has an FX2 chip on the PCB and the USB lines are connected to the USB connector.

Either way both are in the FX2 datasheet: https://www.cypress.com/file/138911/download

The chip's i2c lines will also be connected to the config eeprom which should provide easy access.

youxiaojie commented 4 years ago

it works with ixo-usb-jtag I mean which pin of fx2 connected to which i2c‘s signal？

karosium commented 4 years ago

The hardware I2C bus pins of the FX2 chip are used (see SDA/SCL in the datasheet). They are already connected to the config eeprom so you can solder wires straight to the eeprom legs if you wish.

youxiaojie commented 4 years ago

ok. Will the battery's i2c address conflict with eeprom's address if I unconnect eeprom? what is the battery's address in common?

karosium commented 4 years ago

No conflict. SBS compliant battery will be at address 0x16/0x17, config eeprom is at 0xA0/0xA1.