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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…

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…

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…

https://github.com/MarkDing/swd_programing_sram // // Copyright (c) 2013 SILICON LABORATORIES, INC. // // FILE NAME : 32bit_prog_defs.h // DESCRIPTION : ARM Serial Wire debug interface header file // #ifndef _32BIT_PROG_DEFS_ #define _32BIT_PROG_DEFS…

SWD其实和JTAG类似,是一种调试串口. JTAG大致了解了一下.JTAG(Joint Test Action Group)主要4 lines:TMS(模式选择),TCK(时钟),TDI(数据输入),TDO(数据输出).都是串行总线.JTAG model中通过状态机的方式,对cmd进行解析后控制TMS和TDI的输出. SWD(Serial Wire Debug)主要2 lines: SWDIO(双向串行数据线),SWDCLK(串行时钟线,Master drive).协议:ARM CPU sta…

处女座,为了板子走线美观,拉线方便,在项目量产前,还更改了原来外设的IO口,埋头苦干一天,移植ok,发现PB3一直不听使唤,好,加班检查代码,检查初始化,时钟,IO对应,然后试PCB板,是否短路,断路等等等,试遍了,纹丝不动,拉不高也拉不低...这是为什么呢,百度一下,才发现,PB3是JTAG口之一,需要把IO重映射为普通IO口使用,于是看着大大神们的帖子,回答,代码中,加入了以下两句话: RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);…

出处:http://www.douban.com/note/248637026/ ----------------------------------------------------------------------------------------------- 作者:prife感谢:hexlog@gmail.com--------------------------------------------------------------------------------------…

如果我们的板子上只留了4个接口:V3.3,SWDIO,SWDCLK,GND.那么和JTAG的连接关系参见下图: dd400cf22b5c01e57a6c9e198d5383a0_189.jpg (0 Bytes, 下载次数: 0) 下载附件 2010-12-14 22:54 上传   注意缺口方向.然后GND可以接左边任何一个pin(除了最底下这个PIN). 同样的,某些非官方销售的JLink也是只提空4线SWD,连接思路一样.…

Processor operations mostly involve processing data. This data can be stored in memory and accessed from thereon. However, reading data from and storing data into memory slows down the processor, as it involves complicated processes of sending the da…