Unexpected Discovery: Cortex-M Core with 64-bit Timestamp

Tencent Video:

Bilibili Video:

Introduction:

According to the Debug section of the parameter manual, those in the System ROM Table with Timestamp generator are supported, while those without are not supported. The current tested series H743/H750, etc. come with it. Similar to the DWT clock counter, it can be used for debugging as well as for normal program operation. Unexpected Discovery: Cortex-M Core with 64-bit Timestamp

Unexpected Discovery: Cortex-M Core with 64-bit Timestamp

Comparison test of DWT and 64-bit timestamp TSG in C program, the measurement results are basically consistent: Unexpected Discovery: Cortex-M Core with 64-bit Timestamp

Moreover, using a LUA small program can also conveniently control the 64-bit timestamp TSG: Unexpected Discovery: Cortex-M Core with 64-bit Timestamp

LUA test code:

TSG_CNTCR = 0x5C005000  --bit0 used to enable TSG_CNTFID0 = 0x5C005020  --main frequency setting TSG_CNTCVL = 0x5C005008  --low 32bit TSG_CNTCVU = 0x5C00500C  --high 32bit pg_init() re = pg_write32(TSG_CNTCR, 0x00000000)  if(re == 0) then print("1") end re = pg_write32(TSG_CNTCVL, 0x00000000) if(re == 0) then print("2") end re = pg_write32(TSG_CNTCVU, 0x00000000) if(re == 0) then print("3") end re = pg_write32(TSG_CNTCR, 0x00000001) if(re == 0) then print("4") end re = pg_write32(TSG_CNTFID0, 200000000) if(re == 0) then print("5") end for i=0,500,1 do   a = pg_read32(TSG_CNTCVL)   b = pg_read32(TSG_CNTCVU)   print(string.format("%d, %d", a, b))   delayms(100) end

Reference Materials:

1. Project Download:

https://pan.baidu.com/s/1__NJXovPTmiE8WrkkzEqLA Extraction Code: 3e96

2. H7-TOOL LUA Small Program Tutorial Issue 8: SWD Interface Functions, Read and Write Various Types of Data, Memory and Registers, etc.

https://www.armbbs.cn/forum.php?mod=viewthread&amp;tid=118104

Related posts

Leave a Comment Cancel reply