sdvxio-bio2: Add better comments to amp command, and sleep in fini

src/main/bemanitools/sdvxio.h

@@ -98,8 +98,12 @@ uint16_t sdvx_io_get_input_gpio(uint8_t gpio_bank);
 
 uint16_t sdvx_io_get_spinner_pos(uint8_t spinner_no);
 
-/* Sets the volume of the digital amps if possible */
+/* Sets the volume of the digital amps if possible.
+   Range is between 0-96, where 0 is MAX and 96 is LOW. */
 
-bool sdvx_io_set_amp_volume(uint8_t primary, uint8_t headphone, uint8_t subwoofer);
+bool sdvx_io_set_amp_volume(
+    uint8_t primary,
+    uint8_t headphone,
+    uint8_t subwoofer);
 
 #endif

src/main/sdvxio-bio2/sdvxio.c

@@ -150,6 +150,8 @@ void sdvx_io_fini(void)
 {
     running = false;
     while (processing_io) {
+        // avoid banging
+        Sleep(1);
     }
 }