Serial Wire Debug (SWD) is a 2-pin electrical alternative JTAG interface that has the same JTAG protocol on top.

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MCU Debugging: What is the difference between ITM, SWV and Trace?

What is the difference between ITM (Instrumentation Trace Macrocell), SWV (serial wire viewer) and Trace? For example, in an Atmel SAMG53 ARM M4F; it supports: ...
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Can you safely “short circuit” 2 signals when they compete for the same pin to avoid having to use a multiplexer?

I'm developing for a very limited, 8 pin LPC810 microcontroller and have to connect multiple signals on a single pin. Obviously, if there's only 1 output signal on a bus, that should be OK, but what ...
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SWD and i2C hardware layer differences

Both I2C and SWD are two-wire protocols. I wonder what are the main differences of the hardware layer of these protocols and what are the pros/cons of each one? It's also interesting that the maximum ...
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STM32 - two errors in turns during programming

I'm trying to program STM32F107VCT6 via SWD and I'm constantly getting two errors in turns (literally): Error: Connect failed, check config and cable connection ...
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255 views

How to daisy chain SWD Debug port

I have multiple mcu's that are configured to communicate with bus topology. I have 10 pins (4 of them is occupied by now) I need to debug (update firmware online, etc) all of these mcu's. I read this ...
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117 views

JTAG/SWD Data Logging

I would like to automatically poll and log certain memory locations on the STM32 I'm working with through the j-link debugger I am using to debug the system. Is this possible through the JTAG or SWD ...
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Embedded Pi JTAG program cable

I bought an Embedded Pi as an add-on for my Raspi. Seems that I should have also bought the ColinkEx programming cable too. I happen to have a Northmicro Blaster JTAG cable from when I was working on ...
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OpenOCD w/ ARM-USB-OCD-H+ARM_JTAG_SWD

Has anyone been able to debug/program using SWD over a Olimex USB-JTAG programmer and the ARM-JTAG-SWD adapter? If so, please share how you did it :) Specifically, I'm looking for what the OpenOCD ...
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Relationship between reset pins and SWD functions (ARM Cortex M0)

On many microcontrollers or other devices without JTAG/SWD functionality, there is a reset pin which when low unconditionally and asynchronously forces everything into a known state. On devices with ...
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Laying out a 10-pin JTAG/SWD connector on a final design

I'm designing a board with an ARM microcontroller on it (LPC1347FBD48) and I want to include a 10 pin jtag/swd connector, as is standard, for in-circuit debugging of my final design. Here is the ...
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JLNINK(SWD)+IAR can not debug stm32: communication error

guys. I am using J-link with SWD interface to debug my STM32F103VCT6 in IAR. I can enter download and debug mode but I can not use "step over" or "stop" function. Once I use one of them I will get ...
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JTAG vs SWD debugging

Skimming through this article I'm just wondering, what are the benefits of SWD debugging over JTAG debugging? I understand SWD uses less wires/pins, takes up less space etc. But how does it play out ...
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387 views

Finding an affordable integrated USB MCU

I'm in the early stages of designing a development board around Cypress Semiconductor's PSoC 3 and 5 range of chips. Much like the Arduino, I'd like the programming experience to be very easy, and ...
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486 views

SWD debugging solution

I'm planning to start a project based around a Freescale Cortex-M0+ chip. Apparently the M0+ is SWD only and does not support JTAG. I've been looking around, but I can't find much in the way of SWD ...
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233 views

generating a custom half duplex 1 wire serial protocal

I want to use a microcontroller from NXP to generate a SWD (Serial wire debug) serial signal. A SWD signal is a clock and a host to target header, a single cycle wait period, followed by either a host ...
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Debugging STM32LF1xx low-power behavior

Is there any practical way to use a SWD-based debugger such as those made by Segger to debug a program for the STM32LF1xx which uses low-power modes and sets the clock speed very slow? The debugger ...