use rom linked functions for pin keeping

rust/src/hal/v4_hal.rs

@@ -30,6 +30,22 @@ use measurements::{Current, Voltage};
 use pca9535::{GPIOBank, Pca9535Immediate, StandardExpanderInterface};
 use crate::log::{LogMessage, LOG_ACCESS};
 
+// Minimal esp-idf equivalent for gpio_hold on esp32c6 via ROM functions
+extern "C" {
+    fn gpio_pad_hold(gpio_num: u32);
+    fn gpio_pad_unhold(gpio_num: u32);
+}
+
+#[inline(always)]
+fn hold_enable(gpio_num: u8) {
+    unsafe { gpio_pad_hold(gpio_num as u32) }
+}
+
+#[inline(always)]
+fn hold_disable(gpio_num: u8) {
+    unsafe { gpio_pad_unhold(gpio_num as u32) }
+}
+
 const MPPT_CURRENT_SHUNT_OHMS: f64 = 0.05_f64;
 const TWAI_BAUDRATE: twai::BaudRate = twai::BaudRate::B125K;
 
@@ -356,10 +372,10 @@ impl<'a> BoardInteraction<'a> for V4<'a> {
     }
 
     async fn light(&mut self, enable: bool) -> Result<(), FatError> {
-        // unsafe { gpio_hold_dis(self.light.pin()) };
-         self.light.set_level(enable.into());
-        // unsafe { gpio_hold_en(self.light.pin()) };
-         Ok(())
+        hold_disable(10);
+        self.light.set_level(enable.into());
+        hold_enable(10);
+        Ok(())
     }
 
     async fn pump(&mut self, plant: usize, enable: bool) -> FatResult<()> {
@@ -413,9 +429,9 @@ impl<'a> BoardInteraction<'a> for V4<'a> {
     }
 
     async fn general_fault(&mut self, enable: bool) {
-        //FIXME unsafe { gpio_hold_dis(self.general_fault.pin()) };
+        hold_disable(23);
         self.general_fault.set_level(enable.into());
-        //FIXME unsafe { gpio_hold_en(self.general_fault.pin()) };
+        hold_enable(23);
     }
 
     async fn test(&mut self) -> Result<(), FatError> {