lorenz.stechauner/Device-Driver
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add modulo aproach to timer

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This commit is contained in:
Elias Huhsovitz
2026-01-17 16:25:17 +01:00
parent 87217f1150
commit 7d1f661cf1
1 changed files with 33 additions and 2 deletions
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35
g29-wheel/g29_usb.c
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@@ -95,19 +95,50 @@ struct g29_dev {
struct timer_list steer_timer; struct timer_list steer_timer;
u32 steer_phase_ms; u32 steer_phase_ms;
u32 phase_accumulator; /* Phase accumulator for PWM-like key pressing */
struct g29_state last; struct g29_state last;
}; };
#define WHEEL_CENTER 32768
#define WHEEL_MAX_DIST 32768
static void g29_steer_timer_fn(struct timer_list *t) { static void g29_steer_timer_fn(struct timer_list *t) {
struct g29_dev *g29 = timer_container_of(g29, t, steer_timer); struct g29_dev *g29 = timer_container_of(g29, t, steer_timer);
const int rot = le16_to_cpu(g29->last.rot_le); const int rot = le16_to_cpu(g29->last.rot_le);
int distance_from_center = abs(rot - WHEEL_CENTER);
int target_key = (rot < WHEEL_CENTER) ? KEY_A : KEY_D;
bool press_key;
/* Phase accumulator approach:
* Accumulate the distance on each tick.
* When it exceeds the max distance, press the key and wrap.
* This gives us a duty cycle of (distance / WHEEL_MAX_DIST).
*
* Examples:
* distance = WHEEL_MAX_DIST/2 (50%) -> press every 2nd tick
* distance = WHEEL_MAX_DIST (100%) -> press every tick
* distance = WHEEL_MAX_DIST/4 (25%) -> press every 4th tick
*/
g29->phase_accumulator += distance_from_center;
if (g29->phase_accumulator >= WHEEL_MAX_DIST) {
g29->phase_accumulator -= WHEEL_MAX_DIST;
press_key = true;
} else {
press_key = false;
}
/* Report the appropriate horizontal key */
input_report_key(g29->input, KEY_A, press_key && (rot < WHEEL_CENTER));
input_report_key(g29->input, KEY_D, press_key && (rot >= WHEEL_CENTER));
/* Gas/clutch to W/S (note: 0xFF is unpressed, 0x00 is fully pressed) */
input_report_key(g29->input, KEY_W, g29->last.gas <= 0x80); input_report_key(g29->input, KEY_W, g29->last.gas <= 0x80);
input_report_key(g29->input, KEY_S, g29->last.clt <= 0x80); input_report_key(g29->input, KEY_S, g29->last.clt <= 0x80);
input_report_key(g29->input, KEY_A, rot <= 0x6000);
input_report_key(g29->input, KEY_D, rot >= 0xA000); input_sync(g29->input);
mod_timer(&g29->steer_timer, jiffies + msecs_to_jiffies(2)); mod_timer(&g29->steer_timer, jiffies + msecs_to_jiffies(2));
} }