Fixed loop bounds and buffer length

src/main.rs

@@ -83,7 +83,7 @@ mod app {
             2,
             CCR<stm32f4xx_hal::pac::TIM4, 2>,
             stm32f4xx_hal::dma::MemoryToPeripheral,
-            &'static mut [u16; 256],
+            &'static mut [u16; 128],
         >,
         audio_max_duty: u16,
 
@@ -96,7 +96,7 @@ mod app {
 
     #[shared]
     struct Shared {
-        audio_buffer: Option<&'static mut [u16; 256]>,
+        audio_buffer: Option<&'static mut [u16; 128]>,
     }
 
     #[init]
@@ -239,8 +239,8 @@ mod app {
             });
         };
 
-        let audio_buff1 = singleton!(: [u16; 256] = [100; 256]).unwrap();
-        let audio_buff2 = singleton!(: [u16; 256] = [100; 256]).unwrap();
+        let audio_buff1 = singleton!(: [u16; 128] = [100; 128]).unwrap();
+        let audio_buff2 = singleton!(: [u16; 128] = [100; 128]).unwrap();
 
         let dma1 = StreamsTuple::new(cx.device.DMA1);
 
@@ -356,11 +356,11 @@ mod app {
 
         cx.shared.audio_buffer.lock(|buffer| {
             let audio_buffer = buffer.take().unwrap();
-            for idx in 0..samples.len() / 2 {
+            for idx in 0..samples.len() {
                 let filtered = usb_filter.compute(samples[idx]);
-                fft_input[idx] = filtered;
+                fft_input[idx] = samples[idx];
 
-                audio_buffer[idx] = (filtered.re * (audio_max_duty as f32)) as u16;
+                audio_buffer[idx] = ((filtered.re * (audio_max_duty as f32)) * 3.0f32) as u16;
             }
 
             *buffer = Some(audio_buffer);