22 votes
Accepted

Orange unshielded coaxial cable

Technically, if it doesn't have a shield, it's not a coax cable, or wire. That aside, it may be a tracer wire (not sure if this is the proper name or not). Utilities bury these alongside non-metallic ...
SteveSh's user avatar
  • 10.8k
9 votes

Orange unshielded coaxial cable

SteveSh's answer appears correct, but there's an additional piece of evidence he didn't mention that also indicates that this is a tracer wire. The American Public Works Association (APWA) defines ...
cjs's user avatar
  • 983
7 votes

How does ISP cut the customer's internet access technically?

Your question is really broad and not very specific. I'll try to answer anyway, but i can't go into bit level detail due to time. For wired internet - as already commented - there are different ways ...
aslmx's user avatar
  • 141
7 votes

Why are male pins used for in circuit serial programming?

Male headers are generally less expensive and, with exposed pins, less likely to pick up internal contamination (for example during washing of the boards) without the necessity of seals that have to ...
Spehro Pefhany's user avatar
6 votes
Accepted

Programming several AVRs with one ISP: which line to break?

break MOSI because that's an output back to the host and break SCK so the other MCU can't see the programming commands. edit - this still won't work as reset will be pulsed on and off during the ...
Jasen  Слава Україні's user avatar
6 votes

How can I save a floating point value to a Microcontroller data Flash

Your problem probably arises from an implicit type conversion from a float to an int at this line: FMC->ISPDAT = 22.5; /* Set Data to Program */...
Brendan Simpson's user avatar
5 votes

Can anything be done about this AVRISP mkII or is it dead?

I had a similar issue with the AVR ISP MKII when I first got it. I connected up the programmer, turned on the board (which was powered from an adjacent USB port), and pop. On my board the regulated ...
Tom Carpenter's user avatar
5 votes
Accepted

Getting started with AVR programming concepts

AVR microcontrollers (and most modern µC) contain special hardware specifically for programming directly using a combination of the SPI port (called ISP for this special case) and the reset pin. This ...
evildemonic's user avatar
  • 9,209
5 votes
Accepted

Does the code on an ATTiny execute while it is being programmed by ISP?

The ATTiny, and every other IC I'm aware of, can only be programmed while it's held in the reset state. As such, any ICSP device must assert the RESET line for the entire duration of the programming ...
Hearth's user avatar
  • 32.6k
4 votes
Accepted

why isp avr MCU doesn't need ground?

Probably you have a sneak ground through the earth in your circuit and the USB connector on your computer to earth. Edit: Alternately, AC signals may be capacitively coupled and DC-restored via the ...
Spehro Pefhany's user avatar
4 votes
Accepted

STM32F429 Discovery debug options

I have the same board and the top part actually contains the ST-LINK/V2 debugger/programmer. You can even use it to debug/program other boards by configuring the CN4 jumpers. There's more detail in ...
lnowak's user avatar
  • 78
4 votes
Accepted

74HC125/74AC125 vs. 74AHC125N/74AHC125 for overvoltage tolerant USBtinyISP 2.0

Luck has nothing to do with this. HC and AHC series are different and must be chosen and used within their specs. It is unlikely that a company would label same chip as AHC and HC as circuits may ...
Justme's user avatar
  • 149k
3 votes

Will my circuit interfere with ATtiny25 in system programming?

is that too much? no. i have done worse.
dannyf's user avatar
  • 4,352
3 votes

Can anything be done about this AVRISP mkII or is it dead?

The red marked section seems power section, trace the tracks and confirm it, if this is a power supply section check if it is out putting power, if not then fixing this section would make it work ...
Raj's user avatar
  • 897
3 votes
Accepted

How can an ISP program an AVR over SPI if there is no code on the device?

A fresh AVR, while it has no code programmed into the user space, doesn't mean it has no capability. You'll notice that the RESET line is used as part of the ISP protocol. While the RESET line ...
Neil_UK's user avatar
  • 166k
3 votes
Accepted

How does AVRDUDE communicate with the programmer?

This is more belongs to stackoverflow and this is more related to the device drivers. However, Nowadays USB device drivers are written in ring3 instead of ring0. In English they are user mode drivers....
Standard Sandun's user avatar
3 votes
Accepted

programming atmega2560 by ISP on self-made PCB

can it still work with only one VCC pin and one GND pin No. The MCU will not work correctly like that. I have seen various different incorrect behaviours when this design mistake has been made, so I ...
SamGibson's user avatar
  • 17.9k
3 votes
Accepted

Serial Programming and I2C port "conflict"

The MPU-6050 may prevent you from programming the ATTiny successfully. It would interpret the ISP data as I²C and react accordingly. Expect interesting behaviuor on ...
Turbo J's user avatar
  • 10.1k
3 votes
Accepted

Pin Assignment in ispLEVER Classic

Found it on my own after an hour of searching. As per the website: How can I assign device pin out for GAL devices? The Design Planner (or the Constraint / Preference Editor) is not ...
audiFanatic's user avatar
3 votes

How to stabilise SPI connection

If you leave the chip in place you will encounter major problems. You have to supply power to the chip, but the powers supply is likely to be connected to all devices with the same supply voltage. e....
Oldfart's user avatar
  • 14.4k
3 votes
Accepted

In-system programming of the SPI Flash chip

So you're asking how to determine whether a chip can be in-system programmed. There's a lot of factors to that, but the ones I can think of are: selective powering: Can you power the memory IC ...
Marcus Müller's user avatar
3 votes
Accepted

JTAG, SWD, EDBG, ICSP, ISP terms

Chipmakers have different names for programming interfaces that all basically do the same thing: ISP - programming interface for Atmel (now Microchip) AVRs. SPI-like (MISO, MOSI, SCK, reset). It can ...
filo's user avatar
  • 8,951
3 votes
Accepted

Why 10-pin and 6-pin ISP?

The reason for the GND pins is crosstalk. This is not much of a problem with short cables but becomes an issue with longer ones. The crosstalk is caused by the capacitance between the wires in the ...
Kartman's user avatar
  • 6,258
2 votes

Am I able to burn a bootloader and program with an AVR ISP?

What on earth does the AVR ISP actually do? The document AVR910: In-System Programming from Atmel is probably a good start to get a better understanding. It describes the required and expected ...
hlovdal's user avatar
  • 1,009
2 votes
Accepted

What mode (CPOL, CPHA) should a programmer of an AVR ATMEGA324PA use?

According to the datasheet: When writing serial data to the Atmel ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P, data is clocked on the rising edge of SCK. When reading data from the ...
Majenko's user avatar
  • 56.2k
2 votes

Programming several AVRs with one ISP: which line to break?

I think that in order to do this, you have to keep the other chip in reset to make the IO high-Z (not driven). Usually the CS (chip select) does this, but there is no chip select available here. See ...
Jeroen3's user avatar
  • 23k
2 votes

What is the role of a Network Interface Device in a ADSL connection?

The NID is owned by the phone company, and represents the point of demarcation between what they are responsible for and what you are responsible for. It contains protective devices that suppress ...
Dave Tweed's user avatar
  • 173k
2 votes

In-system programming of the SPI Flash chip

In-system programming a chip without knowledge of the rest of the design is fraud with dangers. First the device needs to have power. If the board works with it's own supply you are lucky. If not ...
Oldfart's user avatar
  • 14.4k

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