Implement option byte writing and set brown out level

stm-firmware/main.c

@@ -49,6 +49,7 @@
 #include <reflow-controller/temp-profile/temp-profile-executer.h>
 #include <reflow-controller/settings/spi-eeprom.h>
 #include <reflow-controller/main-cycle-counter.h>
+#include <stm-periph/option-bytes.h>
 
 static void setup_nvic_priorities(void)
 {
@@ -211,6 +212,35 @@ static inline void handle_boot_status(void)
 	}
 }
 
+/**
+ * @brief Read out the option bytes of the STM32 and program them to the desired values.
+ *
+ * - This function currently forces the brown out level to Level 3.
+ */
+static void check_and_program_opt_bytes(void)
+{
+	struct option_bytes opts;
+	int err;
+
+	/** - Read option bytes */
+	stm_option_bytes_read(&opts);
+
+
+	if (opts.brown_out_level != 0) {
+		/* Set the brown out level to level 3 => highest brown out limit. */
+		opts.brown_out_level = 0;
+		/** - Program the option bytes if brown out level was not set correctly */
+		err = stm_option_bytes_program(&opts);
+
+		/** - If programming failes, enter panic mode */
+		if (err)
+			panic_mode();
+
+		/** - If programming is successful, reset the system to apply new settings */
+		NVIC_SystemReset();
+	}
+}
+
 /**
  * @brief Setup the system.
  *
@@ -220,6 +250,9 @@ static inline void setup_system(void)
 {
 	float tmp;
 
+	/** - Read the option bytes and if necessary program them to the desired values */
+	check_and_program_opt_bytes();
+
 	/** - Setup the NVIC priorities of the core peripherals using interrupts */
 	setup_nvic_priorities();