run at 48mhz

02-dac/main.c

@@ -7,6 +7,11 @@ unsigned int adc_read(void);
 
 int main(void)
 {
+    while ((RCC->CR & 0x00000002) == 0) {;} // wait till MSI is ready
+    FLASH->ACR |= 2; // Add two wait-states for 48MHz operation
+    RCC->CR = (RCC->CR & ~0x000000F0) | 0x000000B0 | RCC_CR_MSIRGSEL; // Switch to 48 MHz clock
+    while ((RCC->CR & 0x00000002) == 0) {;} // wait till MSI is ready
+
     adc_init();
 
     // DAC initialization:
@@ -29,7 +34,7 @@ int main(void)
         yprev = y;
 
         // Add some delay between samples
-        for (int i = 0; i < 100; ++i);
+        //for (int i = 0; i < 100; ++i);
     }
 }