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

\

FILE

NVM

: 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 freq

RAM

HAND

initTIM1

4000 Hz

f3 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 kHzFILE

NVM

: 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 ;

RAM

HAND

initTIM1

16000 Hz

f3 <enter> 3 ok

Three-bit two's-complement integers

Bits Unsigned value Two's complement value

011 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