From fa00aa0ad45096bd7e546aa45f12b8b22fc878b5 Mon Sep 17 00:00:00 2001
From: Matthew Kennedy <matthewkennedy@outlook.com>
Date: Thu, 1 Dec 2022 15:51:01 -0800
Subject: [PATCH] save ram

---
 firmware/pump_dac.cpp | 2 +-
 firmware/pwm.cpp      | 2 +-
 firmware/pwm.h        | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/firmware/pump_dac.cpp b/firmware/pump_dac.cpp
index 69d37cb..5bc3827 100644
--- a/firmware/pump_dac.cpp
+++ b/firmware/pump_dac.cpp
@@ -7,7 +7,7 @@
 #include "hal.h"
 
 // 48MHz / 1024 = 46.8khz PWM
-PWMConfig pumpDacConfig = {
+static const PWMConfig pumpDacConfig = {
     48'000'000,
     1024,
     nullptr,
diff --git a/firmware/pwm.cpp b/firmware/pwm.cpp
index 1c96450..ec32667 100644
--- a/firmware/pwm.cpp
+++ b/firmware/pwm.cpp
@@ -31,7 +31,7 @@ void Pwm::Start()
     Start(config);
 }
 
-void Pwm::Start(PWMConfig& config)
+void Pwm::Start(const PWMConfig& config)
 {
     m_counterFrequency = config.frequency;
     m_counterPeriod = config.period;
diff --git a/firmware/pwm.h b/firmware/pwm.h
index 00f83ad..e0fe842 100644
--- a/firmware/pwm.h
+++ b/firmware/pwm.h
@@ -13,7 +13,7 @@ public:
     Pwm(PWMDriver& driver);
 
     void Start();
-    void Start(PWMConfig& config);
+    void Start(const PWMConfig& config);
     void SetDuty(int channel, float duty);
     float GetLastDuty(int channel);