Let's see... 2K x 8 requires 19 GPIO lines (11 address + 8 data). 8K
x 8 requires 21.
The ESP32-S3 (latest chip) has 45. That's the raw chip, the modules
use some of the GPIO internally and don't bring everything out. The
ESP32-S3-WROOM-1 module brings out 36 GPIOs.
My memory was faulty, it ONLY has 240 Mhz dual core CPUs, not 270. It
has WiFi and Bluetooth but the antenna is part of the module and RF
isn't going to get from a buttoned up case. Maybe far enough??
Personally I would prefer routing a serial port out like we did with
the Xcat rather than having an "intentional emitter" inside of the
radio.
GPIO0->GPIO7 - EEPROM data.
GPIO8->GPIO15 - bottom 8 bits of address line
GPIO16->GPIO20 - top 5 bits of address line
GPIO21 - chip select.
There are a couple of gotchas of course... The ESP32 is NOT 5 volt
tolerant so there would need to be some level conversion (just a bunch
of FETs perhaps?). Additionally some of the pins are strapping pins
that have special meaning at power up. For example if GPIO0 is held
low at reset then the ESP32 enters boot mode.
So my napkin says it can be done, but not as cleanly as just hooking
up the pins.
73's Skip WB6YMH
toggle quoted message
Show quoted text
On Thu, Jul 28, 2022 at 10:04 PM Casey Crane <ccrane148@...> wrote:
Emulation. It's the only viable option. Otherwise, you have to forego all the CTCSS/DCS, and whatever I/O and options the radio is capable of and reproduce them with other devices since the radio's uP does the signalling processing. I think using the radio's native capabilies is the simples, cleanest and most cost effective option.
