STM8S HSI Calibration errors

[Roy Sutton]

Posted on September 21, 2017 at 15:05

\ Trying to trim HSI I get 3 identical lowest frequencies verified on scope

\ eForth on STM8S103F running MINDEV

\

https://github.com/TG9541/stm8ef

\

http://forum.hobbycomponents.com/viewtopic.php?f=87&t=2180

\  my contrib under user barewires

\ initTIM1 and content from previous page 1

\ 1st try trim freq and confirm register readback at 4 kHz

\

FILENVM: CLK_HSITRIMR $50CC ;: f3 3 CLK_HSITRIMR C! CLK_HSITRIMR C@ . ; \ 3.999 lowest freq ?: f2 2 CLK_HSITRIMR C! CLK_HSITRIMR C@ . ; \ 3.999 ?: f1 1 CLK_HSITRIMR C! CLK_HSITRIMR C@ . ; \ 3.999 ?: f0 0 CLK_HSITRIMR C! CLK_HSITRIMR C@ . ; \ 4.04 kHz reset value: f7 7 CLK_HSITRIMR C! CLK_HSITRIMR C@ . ; \ 4.087: f6 6 CLK_HSITRIMR C! CLK_HSITRIMR C@ . ; \ 4.123: f5 5 CLK_HSITRIMR C! CLK_HSITRIMR C@ . ; \ 4.18: f4 4 CLK_HSITRIMR C! CLK_HSITRIMR C@ . ; \ 4.229 highest freqRAMHANDinitTIM14000 Hzf3 3 ok

[Roy Sutton]

Posted on September 22, 2017 at 09:57

\ Updated tests now work but on another device.

\ contents of HSI.f

\ 1st try trim freq and confirm register readback at 16 kHzFILENVM: CLK_HSITRIMR $50CC ;: f3 3 CLK_HSITRIMR C! CLK_HSITRIMR C@ . ; \ 15.45 lowest freq : f2 2 CLK_HSITRIMR C! CLK_HSITRIMR C@ . ; \ 15.52 : f1 1 CLK_HSITRIMR C! CLK_HSITRIMR C@ . ; \ 15.70: f0 0 CLK_HSITRIMR C! CLK_HSITRIMR C@ . ; \ 15.87 kHz reset value: f7 7 CLK_HSITRIMR C! CLK_HSITRIMR C@ . ; \ 16.05: f6 6 CLK_HSITRIMR C! CLK_HSITRIMR C@ . ; \ 16.24: f5 5 CLK_HSITRIMR C! CLK_HSITRIMR C@ . ; \ 16.43: f4 4 CLK_HSITRIMR C! CLK_HSITRIMR C@ . ; \ 16.62 highest freq: cc $50C0 $F dump ;RAMHANDinitTIM116000 Hzf3 <enter> 3 ok

Three-bit two's-complement integers

Bits Unsigned value Two's complement value011 3  3 010 2  2 001 1  1 000 0  0 111 7  −1 110 6  −2 101 5  −3 100 4  −4 

https://en.wikipedia.org/wiki/Two%27s_complement

[Thomas G]

Posted on September 22, 2017 at 20:12

Here is the code:

https://github.com/TG9541/stm8ef/issues/64