1 files changed, 51 insertions, 0 deletions
diff --git a/rcc/rcc.cpp b/rcc/rcc.cpp
new file mode 100644
index 0000000..57b8f7d
--- /dev/null
+++ b/rcc/rcc.cpp
@@ -0,0 +1,51 @@
+#include "rcc.h"
+#include "flash.h"
+
+void rcc_init() {
+	// Initialize flash.
+	flash_init();
+	
+	#if defined(STM32F1)
+	
+	// Enable HSE.
+	RCC.CR |= 0x10000;
+	while(RCC.CR & 0x20000);
+	
+	// Configure and enable PLL.
+	RCC.CFGR = 0x1d0000;
+	RCC.CR |= 0x1000000;
+	while(!(RCC.CR & 0x2000000));
+	
+	// Switch to PLL.
+	RCC.CFGR |= 0x2;
+	while(!(RCC.CFGR & 0x8));
+	
+	// Set APB1 prescaler to /2.
+	RCC.CFGR |= 0x400;
+	
+	// Set ADCCLK prescaler to /6.
+	RCC.CFGR |= 0x8000;
+	
+	#elif defined(STM32F4)
+	
+	// Enable HSE.
+	RCC.CR |= 0x10000;
+	while(!(RCC.CR & 0x20000));
+	
+	// Configure and enable PLL.
+	RCC.PLLCFGR = 0x20400000 | (7 << 24) | (2 * 168 << 6) | 8;
+	RCC.CR |= 0x1000000;
+	while(!(RCC.CR & 0x2000000));
+	
+	// Switch to PLL.
+	RCC.CFGR |= 0x2;
+	while(!(RCC.CFGR & 0x8));
+	
+	// Set APB1 prescaler to /4.
+	RCC.CFGR |= 5 << 10;
+	
+	// Set APB2 prescaler to /2.
+	RCC.CFGR |= 4 << 13;
+	
+	#endif
+}