Programming internal SRAM over SWD

This documentation describe how to programming ARM Cortex M3 internal SRAM over SWD(Serial Wire Debug) interface. For this purpose, something we too know.

SWD communication protocol. We need to know Low level timing requirement, that is foundation to exchange command and data between debugger and target MCU.
Read/write data from/to internal SRAM. We need to know how to program firmware into desired address, like SRAM(0x20000000). That needs us to know SW-DAP registers usage. Pass address and data over those registers and then into internal SRAM.
Make code running from SRAM. We need to change vector table entry from internal flash to SRAM; And SP and PC also needed change to SRAM location. That need us to know the cortex M3 debug and system registers usage.
We choose Silabs SiM3U167 as target MCU in this implementation. We implement a high level protocol with python script, it calls Silabs provided DLL file interface to access Silabs USB Debug Adapter. Also, we provide a firmware running from C8051F380, it contains a full implementation on both low level communicating timing and high level programming SRAM protocol.


swd_programing_sram-master.zip (5.99 MB, 下载次数: 185) 2015-8-22 17:47 上传 点击文件名下载附件