Posted on June 30, 2017 at 15:57I'm using STM Studio to tune my linrot (linear) sensors according to this application note:
'AN4316 Application note Tuning a STMTouch-based application'
I did this before and it appeared to work. However with this new board revision and new code it does not.
Here is the complete code
https://gist.github.com/netskink/ec3cc4078d20be0f2fb56a67fa50f10d
Here is how I am calculating the coefficients:
https://docs.google.com/spreadsheets/d/1YOwbyMmguZp7F6Dv12cmRwLbypxmPJXVZTNRgd-RVTA/edit?usp=sharing
Here is the relevant portions of the code with some comments:
tsl_conf.h has enabled use of the coefficients
#define TSLPRM_LINROT_USE_NORMDELTA (1) // does this need to be set to use coefficients?
tsl_user.c has been tested with and without the modified coefficients
// Default
//CONST uint16_t MyLinRot0_DeltaCoeff[5] = {0x0100, 0x0100, 0x0100, 0x0100, 0x0100};
// calculated
//CONST uint16_t MyLinRot0_DeltaCoeff[5] = {0x15c, 0x13b, 0x158, 0x138, 0x100}; // CH0, CH1, CH2, .. CH4
// Tweaked to make coefficent[2] greater than calculated to attempt to raise its level.
CONST uint16_t MyLinRot0_DeltaCoeff[5] = {0x15c, 0x13b, 0x1b8, 0x138, 0x100}; // CH0, CH1, CH2, .. CH4
Here are some videos demoing the results
https://www.youtube.com/playlist?list=PLisMMQz00ChxAAp2NwkWGzTL_J7hTVne2
