From ee0ac2871498d1845862b99da9d846b68fb608c0 Mon Sep 17 00:00:00 2001
From: Killorin <askillorin@wpi.edu>
Date: Thu, 24 Apr 2025 12:52:49 -0400
Subject: [PATCH] correct sampling rate (~29 pwm loops)

---
 audio.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/audio.c b/audio.c
index 8c7cad5..2c15424 100644
--- a/audio.c
+++ b/audio.c
@@ -18,6 +18,8 @@
 
 #define AUDIO_PWM_PERIOD 258
 
+uint32_t gSamplingRateDivider = 29; // sampling rate divider
+
 void configure_audio() {
   // configure M0PWM2, at GPIO PF2, BoosterPack 1 header C1 pin 2
   SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOG);
@@ -32,12 +34,13 @@ void configure_audio() {
   PWMGenConfigure(PWM0_BASE, PWM_GEN_2,
                   PWM_GEN_MODE_DOWN | PWM_GEN_MODE_NO_SYNC);
 
-
   PWMGenPeriodSet(PWM0_BASE, PWM_GEN_2,
                   AUDIO_PWM_PERIOD);
   PWMPulseWidthSet(PWM0_BASE, PWM_OUT_5,
                    roundf((float)AUDIO_PWM_PERIOD * 0.5f));
 
+  gSamplingRateDivider =  gSystemClock / AUDIO_PWM_PERIOD / AUDIO_SAMPLING_RATE;
+
   PWMGenIntTrigEnable(PWM0_BASE, PWM_GEN_2, PWM_INT_CNT_ZERO);
 
   PWMOutputState(PWM0_BASE, PWM_OUT_5_BIT, true);
@@ -45,7 +48,6 @@ void configure_audio() {
 }
 
 uint32_t gPWMSample = 0; // PWM sample counter
-uint32_t gSamplingRateDivider = 20; // sampling rate divider
 void PWM_ISR(void)
 {
     PWMGenIntClear(PWM0_BASE, PWM_GEN_2, PWM_INT_CNT_ZERO); // clear PWM interrupt flag