diff --git a/src/main/drivers/system_stm32f10x.c b/src/main/drivers/system_stm32f10x.c
index b6f2d423e0..536023fd27 100644
--- a/src/main/drivers/system_stm32f10x.c
+++ b/src/main/drivers/system_stm32f10x.c
@@ -83,7 +83,7 @@ void systemInit(void)
     // Turn on clocks for stuff we use
     RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
 
-    // cache RCC->CSR value to use it in isMPUSoftreset() and others
+    // cache RCC->CSR value to use it in isMPUSoftReset() and others
     cachedRccCsrValue = RCC->CSR;
     RCC_ClearFlag();
 
diff --git a/src/main/drivers/system_stm32f30x.c b/src/main/drivers/system_stm32f30x.c
index a00abdfba0..f3a349706a 100644
--- a/src/main/drivers/system_stm32f30x.c
+++ b/src/main/drivers/system_stm32f30x.c
@@ -90,7 +90,7 @@ void systemInit(void)
     // Configure NVIC preempt/priority groups
     NVIC_PriorityGroupConfig(NVIC_PRIORITY_GROUPING);
 
-    // cache RCC->CSR value to use it in isMPUSoftreset() and others
+    // cache RCC->CSR value to use it in isMPUSoftReset() and others
     cachedRccCsrValue = RCC->CSR;
     RCC_ClearFlag();
 
diff --git a/src/main/drivers/system_stm32f4xx.c b/src/main/drivers/system_stm32f4xx.c
index de32333124..5b7e155640 100644
--- a/src/main/drivers/system_stm32f4xx.c
+++ b/src/main/drivers/system_stm32f4xx.c
@@ -152,7 +152,7 @@ void enableGPIOPowerUsageAndNoiseReductions(void)
 
 bool isMPUSoftReset(void)
 {
-    if (RCC->CSR & RCC_CSR_SFTRSTF)
+    if (cachedRccCsrValue & RCC_CSR_SFTRSTF)
         return true;
     else
         return false;
@@ -167,7 +167,7 @@ void systemInit(void)
     // Configure NVIC preempt/priority groups
     NVIC_PriorityGroupConfig(NVIC_PRIORITY_GROUPING);
 
-    // cache RCC->CSR value to use it in isMPUSoftreset() and others
+    // cache RCC->CSR value to use it in isMPUSoftReset() and others
     cachedRccCsrValue = RCC->CSR;
 
     /* Accounts for OP Bootloader, set the Vector Table base address as specified in .ld file */
diff --git a/src/main/drivers/system_stm32f7xx.c b/src/main/drivers/system_stm32f7xx.c
index db4f9085ea..bfe8039dde 100644
--- a/src/main/drivers/system_stm32f7xx.c
+++ b/src/main/drivers/system_stm32f7xx.c
@@ -149,7 +149,7 @@ void enableGPIOPowerUsageAndNoiseReductions(void)
 
 bool isMPUSoftReset(void)
 {
-    if (RCC->CSR & RCC_CSR_SFTRSTF)
+    if (cachedRccCsrValue & RCC_CSR_SFTRSTF)
         return true;
     else
         return false;
@@ -164,7 +164,7 @@ void systemInit(void)
     // Configure NVIC preempt/priority groups
     HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITY_GROUPING);
 
-    // cache RCC->CSR value to use it in isMPUSoftreset() and others
+    // cache RCC->CSR value to use it in isMPUSoftReset() and others
     cachedRccCsrValue = RCC->CSR;
 
     /* Accounts for OP Bootloader, set the Vector Table base address as specified in .ld file */