diff options
Diffstat (limited to 'rcc/rcc.cpp')
| -rw-r--r-- | rcc/rcc.cpp | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/rcc/rcc.cpp b/rcc/rcc.cpp index 7e711f9..8d4cd78 100644 --- a/rcc/rcc.cpp +++ b/rcc/rcc.cpp @@ -1,5 +1,6 @@ #include "rcc.h" #include "flash.h" +#include "../syscfg/syscfg.h" void rcc_init() { // Initialize flash. @@ -47,5 +48,34 @@ void rcc_init() { // Set APB2 prescaler to /2. RCC.CFGR |= 4 << 13; + #elif defined(STM32L0) + + // Enable HSI16. + RCC.CR |= 1 << 0; // HSI16ON + while(!(RCC.CR & (1 << 2))); // HSI16RDYF + + // Configure PLL. + RCC.CFGR |= (1 << 22) | (1 << 18) | (0 << 16); // PLLDIV = /2, PLLMUL = 4x, PLLSRC = HSI16 + + // Enable PLL. + RCC.CR |= 1 << 24; // PLLON + while(!(RCC.CR & (1 << 25))); // PLLRDY + + // Switch to PLL. + RCC.CFGR |= 3 << 0; // SW = PLL + while((RCC.CFGR & (3 << 2)) != (3 << 2)); // SWS = PLL + + // Enable VREFINT for HSI48. + RCC.enable(RCC.SYSCFG); + SYSCFG.CFGR3 |= (1 << 13) | (1 << 0); // ENREF_HSI48, EN_VREFINT + while(!(SYSCFG.CFGR3 & (1 << 26))); // REF_HSI48_RDYF + + // Enable HSI48. + RCC.CRRCR |= 1 << 0; // HSI48ON + while(!(RCC.CRRCR & (1 << 1))); // HSI48RDY + + // Select HSI48 for USB. + RCC.CCIPR |= 1 << 26; + #endif } |