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fix UpdatePointer and convTwosComp to properly read motion data #4

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fix UpdatePointer and convTwosComp to properly read motion data #4

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8 changes: 4 additions & 4 deletions Arduino Examples/PMW3389DM-polling/PMW3389DM-polling.ino
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Original file line number Diff line number Diff line change
Expand Up @@ -203,8 +203,8 @@ void UpdatePointer(void){
adns_write_reg(Motion, 0x01);
adns_read_reg(Motion);

xydat[0] = (int)adns_read_reg(Delta_X_L);
xydat[1] = (int)adns_read_reg(Delta_Y_L);
xydat[0] = (int)adns_read_reg(Delta_X_L) | (int)adns_read_reg(Delta_X_H) << 8;
xydat[1] = (int)adns_read_reg(Delta_Y_L) | (int)adns_read_reg(Delta_Y_H) << 8;

movementflag=1;
}
Expand Down Expand Up @@ -237,8 +237,8 @@ void dispRegisters(void){

int convTwosComp(int b){
//Convert from 2's complement
if(b & 0x80){
b = -1 * ((b ^ 0xff) + 1);
if(b & 0x8000){
b = -1 * ((b ^ 0xffff) + 1);
}
return b;
}
Expand Down