some fixes

Signed-off-by: James Calligeros <jcalligeros99@gmail.com>

j314.conf

@@ -8,7 +8,7 @@ tr_coil = 6
 ramp_factor = 7
 temp_limit = 100
 vs_chan = 1
-is_chan = 2
+is_chan = 0
 
 [Right Tweeter]
 r_shunt = 1
@@ -20,7 +20,7 @@ tr_coil = 6
 ramp_factor = 7
 temp_limit = 100
 vs_chan = 3
-is_chan = 4
+is_chan = 2
 
 [Left Woofer 1]
 r_shunt = 1
@@ -32,7 +32,7 @@ tr_coil = 6
 ramp_factor = 7
 temp_limit = 100
 vs_chan = 5
-is_chan = 6
+is_chan = 4
 
 [Right Woofer 1]
 r_shunt = 1
@@ -44,7 +44,7 @@ tr_coil = 6
 ramp_factor = 7
 temp_limit = 100
 vs_chan = 7
-is_chan = 8
+is_chan = 6
 
 [Left Woofer 2]
 r_shunt = 1
@@ -56,7 +56,7 @@ tr_coil = 6
 ramp_factor = 7
 temp_limit = 100
 vs_chan = 9
-is_chan = 10
+is_chan = 8
 
 [Right Woofer 2]
 r_shunt = 1
@@ -68,4 +68,4 @@ tr_coil = 6
 ramp_factor = 7
 temp_limit = 100
 vs_chan = 11
-is_chan = 12
+is_chan = 10

src/helpers.rs

@@ -15,6 +15,18 @@ pub fn fail() {
     std::process::exit(1);
 }
 
+pub fn average(a: &[i16]) -> f32 {
+    let mut sum: f32 = 0.0;
+    let mut avg: f32 = 0.0;
+    for i in a {
+        sum = sum + *i as f32;
+    }
+
+    avg = sum / (a.len() as f32);
+
+    return avg;
+}
+
 pub fn open_card(card: &str) -> alsa::ctl::Ctl {
     let ctldev: alsa::ctl::Ctl = match alsa::ctl::Ctl::new(card, false) {
         Ok(ctldev) => ctldev,
@@ -35,9 +47,9 @@ pub fn open_pcm(dev: &str, chans: &u32) -> alsa::pcm::PCM {
         let params = alsa::pcm::HwParams::any(&pcm).unwrap();
 
         params.set_channels(*chans).unwrap();
-        params.set_rate(44100, alsa::ValueOr::Nearest).unwrap();
+        params.set_rate(48000, alsa::ValueOr::Nearest).unwrap();
         params.set_format(alsa::pcm::Format::s16()).unwrap();
-        params.set_access(alsa::pcm::Access::RWNonInterleaved).unwrap();
+        params.set_access(alsa::pcm::Access::RWInterleaved).unwrap();
         pcm.hw_params(&params).unwrap();
     }
 

src/main.rs

@@ -8,6 +8,7 @@
 */
 use std::io;
 use std::fs::read_to_string;
+use std::{thread::sleep, time};
 
 use configparser::ini::Ini;
 
@@ -78,7 +79,7 @@ fn main() {
 
     loop {
         // Block while we're reading into the buffer
-        assert_eq!(io.readi(&mut buf).unwrap(), buf.len());
+        io.readi(&mut buf).unwrap();
         for i in &mut speakers {
             i.run(&card, &buf);
         }

src/types.rs

@@ -172,8 +172,8 @@ impl SafetyMonitor for Speaker {
     }
 
     fn power_now(&mut self, vs: &[i16], is: &[i16]) -> f32 {
-        let v_avg: f32 = (vs.iter().sum::<i16>() as f32 / vs.len() as f32) * (14 / (2 ^ 15)) as f32;
+        let v_avg: f32 = helpers::average(vs) * (14 / (2 ^ 15)) as f32;
-        let i_avg: f32 = (is.iter().sum::<i16>() as f32 / is.len() as f32) * (14 / (2 ^ 15)) as f32;
+        let i_avg: f32 = helpers::average(is) * (3.75 / (2 ^ 15) as f32) as f32;
 
         return v_avg * i_avg;
     }
@@ -181,8 +181,8 @@ impl SafetyMonitor for Speaker {
     // I'm not sure on the maths here for determining when to start dropping the volume.
     fn run(&mut self, card: &Ctl, buf: &[i16; 128 * 6 * 2]) {
         let lvl: f32 = self.alsa_iface.get_lvl(card);
-        let vsense = &buf[(128 * self.vs_chan as usize - 1) .. (128 * self.vs_chan as usize - 1) + 128];
+        let vsense = &buf[(128 * self.vs_chan) as usize .. (128 * (self.vs_chan + 1) - 1) as usize];
-        let isense = &buf[(128 * self.is_chan as usize - 1) .. (128 * self.is_chan as usize - 1) + 128];
+        let isense = &buf[(128 * self.is_chan) as usize .. (128 * (self.is_chan + 1) - 1) as usize];
 
         // Estimate temperature of VC and magnet
         let temp0: f32 = 35f32;
@@ -193,6 +193,7 @@ impl SafetyMonitor for Speaker {
 
         // Power through the voice coil (average of most recent 128 samples)
         let pwr: f32 = self.power_now(&vsense, &isense);
+        println!("Power now is {:.2} mW", pwr);
 
         let vc_target: f32 = temp_magnet + pwr * self.tau_coil;
         temp_vc = vc_target * alpha_vc + temp_vc * (1.0 - alpha_vc);
@@ -205,22 +206,17 @@ impl SafetyMonitor for Speaker {
         if temp_vc < self.temp_limit {
             println!("Voice coil for {} below temp limit, ramping back up.", self.name);
             // For every degree below temp_limit, raise level by 0.5 dB
-            let new_lvl: f32 = lvl + ((self.temp_limit - temp_vc) as f32 * 0.5);
+            let new_lvl: f32 = lvl + ((self.temp_limit - temp_vc) * 0.5);
             self.alsa_iface.set_lvl(card, new_lvl);
         }
 
         if temp_vc > (self.temp_limit - 15f32) {
             println!("Voice coil at {}*C on {}! Dropping volume!", temp_vc, self.name);
             // For every degree above temp_limit, drop the level by 1.5 dB
-            let new_lvl: f32 = lvl - ((temp_vc - self.temp_limit) as f32 * 1.5);
+            let new_lvl: f32 = lvl - ((temp_vc - (self.temp_limit - 15f32)) * 1.5);
             self.alsa_iface.set_lvl(card, new_lvl);
         }
 
-        println!("Volume on {} is currently {} dB. Setting to -18 dB.", self.name, lvl);
-
-        let new_lvl: f32 = -18.0;
-        self.alsa_iface.set_lvl(card, new_lvl);
-
         println!("Volume on {} is now {} dB", self.name, self.alsa_iface.get_lvl(card));
     }
 }