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genesys: Work around bad acceleration curves on certain gl646 scanners

merge-requests/213/head
Povilas Kanapickas 2019-12-23 02:27:05 +02:00
rodzic a0e978d4ae
commit 5d83753b07
1 zmienionych plików z 13 dodań i 3 usunięć
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16
backend/genesys/gl646.cpp
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@ -350,11 +350,19 @@ void CommandSetGl646::init_regs_for_scan_session(Genesys_Device* dev, const Gene
}
/* motor steps used */
regs->find_reg(0x21).value = slope_table1.steps_count;
regs->find_reg(0x24).value = slope_table2.steps_count;
unsigned forward_steps = motor->fwdbwd;
unsigned backward_steps = motor->fwdbwd;
// the steps count must be different by at most 128, otherwise it's impossible to construct
// a proper backtracking curve. We're using slightly lower limit to allow at least a minimum
// distance between accelerations (forward_steps, backward_steps)
if (slope_table1.steps_count > slope_table2.steps_count + 100) {
slope_table2.steps_count += slope_table1.steps_count - 100;
}
if (slope_table2.steps_count > slope_table1.steps_count + 100) {
slope_table1.steps_count += slope_table2.steps_count - 100;
}
if (slope_table1.steps_count >= slope_table2.steps_count) {
backward_steps += (slope_table1.steps_count - slope_table2.steps_count) * 2;
} else {
@ -374,6 +382,8 @@ void CommandSetGl646::init_regs_for_scan_session(Genesys_Device* dev, const Gene
forward_steps -= backward_steps - 255;
}
regs->find_reg(0x21).value = slope_table1.steps_count;
regs->find_reg(0x24).value = slope_table2.steps_count;
regs->find_reg(0x22).value = forward_steps;
regs->find_reg(0x23).value = backward_steps;