开发环境： 1.CLion + openocd_cubemx 插件 2.openocd
3.cmsisdap（stm32F103C8T6）
4.jlinkob (STM32F072C8T6)
自娱自乐制作的JLINK CMSIS-DAP

下面是烧写同一个程序时，jlinkob和cmsisdap的不同表现

1. swd
   
2. adapter speed: 1000 kHz
   
3. adapter_nsrst_delay: 100
   
4. none separate
   
5. cortex_m reset_config sysresetreq
   
6. Info : CMSIS-DAP: SWD  Supported
   
7. Info : CMSIS-DAP: Interface Initialised (SWD)
   
8. Info : CMSIS-DAP: FW Version = 1.0
   
9. Info : SWCLK/TCK = 1 SWDIO/TMS = 1 TDI = 0 TDO = 0 nTRST = 0 nRESET = 1
   
10. Info : CMSIS-DAP: Interface ready
    
11. Info : clock speed 1000 kHz
    
12. Info : SWD DPIDR 0x1ba01477
    
13. Info : stm32f1x.cpu: hardware has 6 breakpoints, 4 watchpoints
    
14. target halted due to debug-request, current mode: Thread
    
15. xPSR: 0x01000000 pc: 0x08000200 msp: 0x20005000
    
16. ** Programming Started **
    
17. auto erase enabled
    
18. Info : device id = 0x20036410
    
19. Info : flash size = 128kbytes
    
20. wrote 20480 bytes from file /home/ailike/Private/Workplace/STM32/f103RB/cmake-build-debug/f103RB.elf in 2.676811s (7.472 KiB/s)
    
21. ** Programming Finished **
    
22. shutdown command invoked
    
23. 
    
24. ///////////////////////////////////////////////////
    
25. 
    
26. swd
    
27. adapter speed: 1000 kHz
    
28. adapter_nsrst_delay: 100
    
29. none separate
    
30. cortex_m reset_config sysresetreq
    
31. Info : No device selected, using first device.
    
32. Info : J-Link OB-STM32F072-CortexM compiled Mar  8 2333 11:15:54
    
33. Info : Hardware version: 1.00
    
34. Info : VTarget = 3.300 V
    
35. Info : clock speed 1000 kHz
    
36. Info : SWD DPIDR 0x1ba01477
    
37. Info : stm32f1x.cpu: hardware has 6 breakpoints, 4 watchpoints
    
38. target halted due to debug-request, current mode: Thread
    
39. xPSR: 0x01000000 pc: 0x08000200 msp: 0x20005000
    
40. ** Programming Started **
    
41. auto erase enabled
    
42. Info : device id = 0x20036410
    
43. Info : flash size = 128kbytes
    
44. wrote 20480 bytes from file /home/ailike/Private/Workplace/STM32/f103RB/cmake-build-debug/f103RB.elf in 1.176331s (17.002 KiB/s)
    
45. ** Programming Finished **
    
46. shutdown command invoked

复制代码

可以看出在调试频率相同的情况下，jlink的flash烧写速度远超cmsisdap
本来是怀疑cmsisdap下载算法有问题
但是在keil中使用时，二者速度相差无几
。。。怀疑是openocd的cmsisdap驱动问题
google了一下，果不其然
sourceforge讨论地址

cmsisdap的openocd驱动还处于测试阶段，性能比较糟糕
准备有空用一下arm自家的python库-----pyOCD测试cmsisdap下载速度
写个python脚本代替openocd来下载和仿真

这是因为CMSIS-DAP为了免驱，选用了HID协议，全速上限64KB，而openocd以同步方式发收命令和应答，速度上限只有32KB，再考虑协议开销，读写速度只有25KB左右了。
vllink lite用bulk做了cmsis-dap协议兼容，异步乒乓传输，swd在16M时钟下，速度可达400KB/S。
不过只提供基于gd32f350的固件。