PSoC 5 supports programming through the serial wire debug (SWD) interface. There are two signals in SWD interface: data signal (SWDIO) and a clock for data signal (SWDCK). The host programmer always drives the clock line, whereas either the programme…

1 Debug Interface Overview 1.1 Serial Wire Debug Serial Wire Debug (SWD) is a two-wire protocol for accessing the ARM debug interface. It is part of the ARM Debug Interface Specification v5 and is an alternative to JTAG. The physical layer of SWD con…

SW-DP (Serial Wire Debug Port) Analyzer plugin for the Saleae Logic The SW-DP protocol is described by the following publicly available documents: DDI 0316 CoreSight™ DAP-Lite Technical Reference Manual Programming Internal Flash Over the Serial Wire…

Implementation of Serial Wire JTAG flash programming in ARM Cortex M3 Processors The goal of the project was to use the Serial Wire JTAG protocol implemented in the ARM cortex processors for programming the flash memory of it. JTAG was actually imple…

Serial Wire Debug (SWD) provides a debug port for severely pin limited packages, often the case for small package microcontrollers but also complex ASICs where limiting pin-count is critical and can be the controlling factor in device costs. SWD repl…

Serial Wire Debugging the STM32 via the Bus Pirate 2 October 2010 Step 1 - The Bus Pirate Step 2 - Debug Port Communications Step 3 - Access Port Communications Step 4 - Processor State Step 5 - Programming the Flash Step 6 - Optimizing Conclusion So…

Being able to display values for counters, sensors and other debugging information is an important part of software development for microcontrollers.  Writing software for PCs is much easier in this regard as there is already a monitor to which you c…

JTAG was the traditional mechanism for debug connections for ARM7/9 parts, but with the Cortex-M family, ARM introduced the Serial Wire Debug (SWD) Interface. SWD is designed to reduce the pin count required for debug from the 5 used by JTAG (includi…

Serial Wire Debug interface The Serial Wire Debug protocol operates with a synchronous serial interface. This uses a single bidirectional data signal, and a clock signal. This section gives an overview of the physical Serial Wire Debug interface. Lin…

Introducing swddude I love the ARM Cortex-M series of microcontrollers.   The sheer computational power they pack into a teensy, low-power package is almost embarrassing. But, many Cortex-M parts are small — 4x4 millimeters small — and don’t have the…