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timvideos / HDMI2USB-litex-firmware

A version of the HDMI2USB firmware based around LiteX tools produced by @Enjoy-Digital (based on misoc+migen created by @M-Labs)
https://hdmi2usb.tv
BSD 2-Clause "Simplified" License
145 stars 71 forks source link

Add I2C EEPROM gateware and software #21

Open enjoy-digital opened 9 years ago

enjoy-digital commented 9 years ago

I2C Eeprom stores MAC address. We have to implement gateware and software support to access the EEPROM.

mithro commented 9 years ago

We also plan to store other manufacturing information in the EEPROM such as the git revision of the PCB.

It would be good to support dumping it out the UART. On 21 Aug 2015 7:41 pm, "enjoy-digital" notifications@github.com wrote:

I2C Eeprom stores MAC address. We have to implement gateware and software support to access the EEPROM.

— Reply to this email directly or view it on GitHub https://github.com/timvideos/HDMI2USB-misoc-firmware/issues/21.

enjoy-digital commented 9 years ago

gateware: https://github.com/timvideos/HDMI2USB-misoc-firmware/commit/7ee9cdaf023cfd5997ea620d5405c64805255370 software: https://github.com/timvideos/HDMI2USB-misoc-firmware/commit/34e8d37ee3685df65ffed18ac1853981839e5019

it needs tests and the eeprom protocol on top of that.

mithro commented 9 years ago

The EEPROM on the Numato Opsis is a 24AA02E48 - http://www.microchip.com/wwwproducts/Devices.aspx?product=24AA02E48

The Microchip Technology Inc. 24AA02E48 is a 2 Kbit Electrically Erasable PROM. The device is organized as two blocks of 128 x 8-bit memory with a 2-wire serial interface. The 24AA02XEXX is programmed at the factory with a globally unique node address stored in the upper half of the array and permanently write-protected. The remaining 1,024 bits are available for application use.

mithro commented 9 years ago

Verilog models for the EEPROM can be found at http://ww1.microchip.com/downloads/en/DeviceDoc/24xx02_Verilog_Model.zip

Sample code for an 8051 processor can be found at http://ww1.microchip.com/downloads/en/AppNotes/01195b.pdf and http://ww1.microchip.com/downloads/en/AppNotes/AN1195%20Source%20Code.zip

mithro commented 9 years ago

I have FX2 firmware which reads the MAC address in the EEPROM and patches it into the usb-serial adapter https://github.com/mithro/fx2lib/commit/cd7e61c03d9b69580e6d4cb8394fb0bc1159e7ed#diff-030c9487adb525e6b1e25c4c56bfee71R119

mithro commented 9 years ago

Cleaner implementation at https://github.com/mithro/HDMI2USB-misoc-firmware/commit/fbdd64bd516be9c74d751675f2394c273a2a1eb9

mithro commented 9 years ago

@fallen

mithro commented 8 years ago

There is now a command to dump the Opsis EEPROM at https://github.com/mithro/HDMI2USB-misoc-firmware/commit/d11c9e9bbee638baf062852e0fb3fce982782819