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by Pito
Sat Mar 25, 2017 11:55 am
Forum: Generic STM32F103
Topic: Execute from external SRAM
Replies: 150
Views: 2788

Re: Execute from external SRAM

I built my first 8085 computer in '82. I know well for what you are dreaming about.. :ugeek:
I think the ZET6 board with 512 or 1024kB of external ram is an ideal and cheap platform for such retro-computing stuff..
by Pito
Fri Mar 24, 2017 3:50 pm
Forum: Generic STM32F103
Topic: Execute from external SRAM
Replies: 150
Views: 2788

Re: Execute from external SRAM

CP/M on Arduino Nano:

https://forum.arduino.cc/index.php?topi ... rdseen#new

That could easily be run with the CP/M_RAM placed into the 512kB Heap.
At 128MHz it will be faster a bit.. :)
by Pito
Thu Mar 23, 2017 10:11 am
Forum: General discussion
Topic: STM32F3 Discovery board support
Replies: 13
Views: 154

Re: STM32F3 Discovery board support

I need a hardware audio DAC. Don't know if any F1 chip has it, but certainly no F1 mini-board that I've seen. There is a dozen of 103s having dual channel 12bit DAC, from RC up and with larger packages.. Even the old F1VLDiscovery got a dual channel 12bit DAC. Is that the "audio DAC" you ...
by Pito
Thu Mar 23, 2017 9:34 am
Forum: General discussion
Topic: STM32F3 Discovery board support
Replies: 13
Views: 154

Re: STM32F3 Discovery board support

FYI - in addition to a typical 72MHz F4: Ultra-fast comparators (25 ns) Op-amp with programmable gain 12-bit DACs Ultra-fast 12-bit ADCs with 5 MSPS (Million Samples Per Second) per channel (up to 18 MSPS in Interleaved mode) Precise 16-bit sigma-delta ADCs (21 channels) Core Coupled Memory SRAM (Ro...
by Pito
Thu Mar 23, 2017 8:46 am
Forum: Off topic
Topic: IoT and Sigfox
Replies: 1
Views: 58

IoT and Sigfox

Hi, is there any practical experience with Sigfox and related hw (ie modems, etc.)?
P.
by Pito
Wed Mar 22, 2017 4:56 pm
Forum: General discussion
Topic: Need advise on logic analyser
Replies: 17
Views: 231

Re: Need advise on logic analyser

FYI - the OLSniffer started 2009 or 2010, with a firmware for the pic (the communication between FPGA and PC), with initial version of the bitstream for FPGA (Sump protocol?), and an SUMP client (I never used it). Then, a group of enthusiastic experts, started to develop a new FPGA bitstream, and a ...
by Pito
Wed Mar 22, 2017 8:57 am
Forum: General discussion
Topic: Need advise on logic analyser
Replies: 17
Views: 231

Re: Need advise on logic analyser

The FPGA based LAs work fine. All >50Msps LAs today work FPGA-way. See my post above - Logic Sniffer (OLS) - that is an FPGA 200Msps based LA. Important part of an FPGA based LA is the verilog/vhdl FPGA frontend ("FPGA bitstream") and the PC backend ("client sw"). They are openso...
by Pito
Tue Mar 21, 2017 12:05 pm
Forum: Generic STM32F103
Topic: HELP - STM32F103 board as simple interface ?
Replies: 2
Views: 134

Re: HELP - STM32F103 board as simple interface ?

Or to measure the input voltage with the ADC and then a PWM driven mosfet transistor, acting as V->R converter. Calibrated via stm32 code. Three lines of code :) .. v = analogRead(ANx); r = convert_v_to_r(v); // left to the reader as an exercise analogWrite(PBx, r); .. Example only: PWM to R convert...
by Pito
Sun Mar 19, 2017 12:15 pm
Forum: General discussion
Topic: Need advise on logic analyser
Replies: 17
Views: 231

Re: Need advise on logic analyser

Try to watch the 18MHz SPI transactions with a 24MHz sampling rate.. Or 36MHz SPI.. ;)
Of course, for watching 115k2 uart or 400kHz I2C the 24MHz sampling is ok.
by Pito
Sun Mar 19, 2017 11:47 am
Forum: General discussion
Topic: Need advise on logic analyser
Replies: 17
Views: 231

Re: Need advise on logic analyser

24MHz is quite a low sampling rate. Today 100MHz is a minimum.
This could be an interesting option (around $67 at aliexpress).
http://hackaday.com/2015/05/26/review-d ... -analyzer/
Not tested, however.

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