在linux下使用openocd时 cmsis-dap下载速度奇慢的问题
本帖最后由 割れたリンゴ 于 2017-12-7 16:30 编辑开发环境： 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
swd
adapter speed: 1000 kHz
adapter_nsrst_delay: 100
none separate
cortex_m reset_config sysresetreq
Info : CMSIS-DAP: SWDSupported
Info : CMSIS-DAP: Interface Initialised (SWD)
Info : CMSIS-DAP: FW Version = 1.0
Info : SWCLK/TCK = 1 SWDIO/TMS = 1 TDI = 0 TDO = 0 nTRST = 0 nRESET = 1
Info : CMSIS-DAP: Interface ready
Info : clock speed 1000 kHz
Info : SWD DPIDR 0x1ba01477
Info : stm32f1x.cpu: hardware has 6 breakpoints, 4 watchpoints
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0x08000200 msp: 0x20005000
** Programming Started **
auto erase enabled
Info : device id = 0x20036410
Info : flash size = 128kbytes
wrote 20480 bytes from file /home/ailike/Private/Workplace/STM32/f103RB/cmake-build-debug/f103RB.elf in 2.676811s (7.472 KiB/s)
** Programming Finished **
shutdown command invoked
///////////////////////////////////////////////////
swd
adapter speed: 1000 kHz
adapter_nsrst_delay: 100
none separate
cortex_m reset_config sysresetreq
Info : No device selected, using first device.
Info : J-Link OB-STM32F072-CortexM compiled Mar8 2333 11:15:54
Info : Hardware version: 1.00
Info : VTarget = 3.300 V
Info : clock speed 1000 kHz
Info : SWD DPIDR 0x1ba01477
Info : stm32f1x.cpu: hardware has 6 breakpoints, 4 watchpoints
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0x08000200 msp: 0x20005000
** Programming Started **
auto erase enabled
Info : device id = 0x20036410
Info : flash size = 128kbytes
wrote 20480 bytes from file /home/ailike/Private/Workplace/STM32/f103RB/cmake-build-debug/f103RB.elf in 1.176331s (17.002 KiB/s)
** Programming Finished **
shutdown command invoked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。
页:
[1]