configurable pwmchip for hw clock on pi5

photobooth-app · Oct 23, 2024 · 5da204b · 5da204b
1 parent b5cb8e2
commit 5da204b
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Showing 2 changed files with 4 additions and 2 deletions.
diff --git a/node/config/models.py b/node/config/models.py
@@ -7,6 +7,8 @@ class ConfigGpioPrimaryClockwork(BaseModel):
     trigger_out_pin_name: str = Field(default="GPIO17")
     ext_trigger_in_pin_name: str = Field(default="GPIO4")
     FPS_NOMINAL: int = Field(default=10)
+    pwmchip: str = Field(default="pwmchip2")  # pi5: 2, other 0
+    pwm_channel: int = Field(default=2)  # pi5: 2, other 0
 
 
 class ConfigGpioSecondaryNode(BaseModel):

diff --git a/node/services/gpio_primary_clockwork.py b/node/services/gpio_primary_clockwork.py
@@ -85,10 +85,10 @@ def set_hardware_clock(self, enable: bool = True):
         # 1/10FPS = 0.1 * 1e6 = 100.000.000ns period
         # duty cycle = period / 2
         """
-        PWM_CHANNEL = "0"
+        PWM_CHANNEL = self._config.pwm_channel
         PERIOD = int(1 / self._config.FPS_NOMINAL * 1e9)  # 1e9=ns
         DUTY_CYCLE = PERIOD // 2
-        PWM_SYSFS = Path("/sys/class/pwm/pwmchip0")
+        PWM_SYSFS = Path(f"/sys/class/pwm/{self._config.pwmchip}")
 
         if not PWM_SYSFS.is_dir():
             raise RuntimeError("pwm overlay not enabled in config.txt")