ARMing a Breadboard – Everyone Should Program an ARM
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Re: ARMing a Breadboard – Everyone Should Program an ARM
#2So if you have a breadboard and a USB to serial adapter, you could build the bare bones version of this for about $6 and maybe break the bank at $15 if you had to buy everything.
I've got a usb to serial adapter just sitting here, definitely trying this project for just $6
Wish it only needed 5V supply, I have endless phone chargers laying around from 500ma to 2a
Re: ARMing a Breadboard – Everyone Should Program an ARM
#3So if you have a breadboard and a USB to serial adapter, you could build the bare bones version of this for about $6 and maybe break the bank at $15 if you had to buy everything. I've got a usb to serial adapter just sitting here, definitely trying this project for just $6 Wish it only needed 5V supply, I have endless phone chargers laying around from 500ma to 2a
Thankfully, a circuit for dropping the 5v input to 3.3v is really easy to build. It only requires a pair of capacitors and a 3.3v regulator, only about $2 of materials total.
Re: ARMing a Breadboard – Everyone Should Program an ARM
#4So if you have a breadboard and a USB to serial adapter, you could build the bare bones version of this for about $6 and maybe break the bank at $15 if you had to buy everything. I've got a usb to serial adapter just sitting here, definitely trying this project for just $6 Wish it only needed 5V supply, I have endless phone chargers laying around from 500ma to 2a
If you don't have the cable, an arduino uno also works as a usb to serial adapter.
https://www.arduino.cc/en/Tutorial/ArduinoToBreadboard
To make 3.3V out of 5V you can use a voltage regulator.
Re: ARMing a Breadboard – Everyone Should Program an ARM
#5So if you have a breadboard and a USB to serial adapter, you could build the bare bones version of this for about $6 and maybe break the bank at $15 if you had to buy everything. I've got a usb to serial adapter just sitting here, definitely trying this project for just $6 Wish it only needed 5V supply, I have endless phone chargers laying around from 500ma to 2a
Thankfully, a circuit for dropping the 5v input to 3.3v is really easy to build. It only requires a pair of capacitors and a 3.3v regulator, only about $2 of materials total.
You can also use a voltage divider if you are willing to suffer a bit of leakage current. That's just 2 resistors.
Re: ARMing a Breadboard – Everyone Should Program an ARM
#6Alternatively the STM32F4 Discovery Board and STM32F29 Discovery Boards, are both really good too.
I think the STM32F4 board is around £12 if I recall correctly.
Re: ARMing a Breadboard – Everyone Should Program an ARM
#7So if you have a breadboard and a USB to serial adapter, you could build the bare bones version of this for about $6 and maybe break the bank at $15 if you had to buy everything. I've got a usb to serial adapter just sitting here, definitely trying this project for just $6 Wish it only needed 5V supply, I have endless phone chargers laying around from 500ma to 2a
If you don't have the cable, an arduino uno also works as a usb to serial adapter. https://www.arduino.cc/en/Tutorial/ArduinoToBreadboard To make 3.3V out of 5V you can use a voltage regulator.
If you want to do anything even semi-reliable with this thing you'll want a regulator on the board anyway. Wall warts are notoriously noisy.
Re: ARMing a Breadboard – Everyone Should Program an ARM
#8Earlier quoted context omitted.
Thankfully, a circuit for dropping the 5v input to 3.3v is really easy to build. It only requires a pair of capacitors and a 3.3v regulator, only about $2 of materials total.
You can also use a voltage divider if you are willing to suffer a bit of leakage current. That's just 2 resistors.
The linear regulators we are talking about are basically voltage dividers with feedback. They aren't significantly more efficient than your design, though they are ton less noisy.
Re: ARMing a Breadboard – Everyone Should Program an ARM
#9So if you have a breadboard and a USB to serial adapter, you could build the bare bones version of this for about $6 and maybe break the bank at $15 if you had to buy everything. I've got a usb to serial adapter just sitting here, definitely trying this project for just $6 Wish it only needed 5V supply, I have endless phone chargers laying around from 500ma to 2a
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Re: ARMing a Breadboard – Everyone Should Program an ARM
#10If you're interested in low-level code (assembly, JITs, Forth, etc.), note that official documentation for the ARM ISA has considerable encumbrance. It's not like most architectures where you just go to the manufacturer's website and download a PDF of the programming manual; ARM makes you register an account and agree to a rather restrictive clickwrap license (something to the effect of "you're only allowed to use this manual to support our products, not to compete with us").
This seems to not be common knowledge. Maybe the atmosphere of typical ARM applications is already so buried under NDAs that nobody cares, or maybe people just punch "ARM Architecture Reference Manual" into Google and grab one of the many slightly-outdated copies that are floating around on .edu servers. But I found it pretty surprising after seeing how widespread ARM is in "open" hardware.