variant(g4): correct the clock config for HSE8 on WeAct G474CEU

* Override HSE value to 8 MHz not 24
* Keep PLL input above 2.66 MHz spec
* Set VCO to a multiple of USB48 and feed that from PLL, sysclk becomes 144

Author: ALTracer

Diff for: variants/STM32G4xx/G473C(B-C-E)U_G474C(B-C-E)U_G483CEU_G484CEU/variant_WEACT_G474CE.cpp

@@ -111,9 +111,9 @@ WEAK void SystemClock_Config(void)
   RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
   RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-  RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV4;
+  RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV2;
   RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
-  RCC_OscInitStruct.PLL.PLLN = 85;
+  RCC_OscInitStruct.PLL.PLLN = 72;
   RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
   RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV6;
   RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
@@ -135,7 +135,7 @@ WEAK void SystemClock_Config(void)
 #ifdef USBCON
   /* Initializes the peripherals clocks */
   PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USB;
-  PeriphClkInit.UsbClockSelection = RCC_USBCLKSOURCE_HSI48;
+  PeriphClkInit.UsbClockSelection = RCC_USBCLKSOURCE_PLL;
   if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK) {
     Error_Handler();
   }
@@ -146,4 +146,4 @@ WEAK void SystemClock_Config(void)
 } // extern "C"
 #endif
 
-#endif /* ARDUINO_NUCLEO_G431RB */
+#endif /* ARDUINO_WEACT_G474CE */

Diff for: variants/STM32G4xx/G473C(B-C-E)U_G474C(B-C-E)U_G483CEU_G484CEU/variant_WEACT_G474CE.h

@@ -184,6 +184,10 @@
   #define HAL_QSPI_MODULE_ENABLED
 #endif
 
+#ifndef HSE_VALUE
+  #define HSE_VALUE 8000000U
+#endif
+
 /*----------------------------------------------------------------------------
  *        Arduino objects - C++ only
  *----------------------------------------------------------------------------*/