Add new STM32U0 family and new target Nucleo-U083RC

targets/TARGET_STM/TARGET_STM32U0/clock_cfg/system_clock.c

@@ -79,10 +79,77 @@ void SetSysClock(void)
 /******************************************************************************/
 /*            PLL (clocked by HSE) used as System clock source                */
 /******************************************************************************/
-MBED_WEAK uint8_t SetSysClock_PLL_HSE(uint8_t bypass) // TODO
+MBED_WEAK uint8_t SetSysClock_PLL_HSE(uint8_t bypass)
 {
-    return 0; // FAIL
-    //return 1; // OK
+    /** HSE settings is prepared for values between 4MHz and <= 40MHz and must 
+     *  be divisible by either 4 or 5! Different values must be set manually.
+     */
+#if (HSE_VALUE < 4000000) || (HSE_VALUE > 40000000) && !((HSE_VALUE % 4000000 != 0) || (HSE_VALUE % 5000000 != 0))
+#error HSE value must be >= 4MHz and <= 40MHz, and must be divisible by either 4 or 5!
+#endif
+
+RCC_OscInitTypeDef RCC_OscInitStruct = {0};
+RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
+
+/** Configure the main internal regulator output voltage
+ */
+HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);
+
+    /** Initializes the RCC Oscillators according to the specified parameters
+     * in the RCC_OscInitTypeDef structure.
+     */
+    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI | RCC_OSCILLATORTYPE_HSI48 | RCC_OSCILLATORTYPE_HSE;
+    RCC_OscInitStruct.MSIState = RCC_MSI_ON;
+    RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
+    if(bypass) {
+        RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;
+    } else {
+        RCC_OscInitStruct.HSEState = RCC_HSE_ON;
+    }
+    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+    if ((HSE_VALUE % 4000000 == 0) && (HSE_VALUE <= 32))
+    {
+        RCC_OscInitStruct.PLL.PLLM = HSE_VALUE / 4;
+        RCC_OscInitStruct.PLL.PLLN = 28;
+        RCC_OscInitStruct.PLL.PLLP = 2;
+        RCC_OscInitStruct.PLL.PLLQ = 2;
+        RCC_OscInitStruct.PLL.PLLR = 2;
+    }
+    else if ((HSE_VALUE % 5000000 == 0) && (HSE_VALUE <= 40))
+    {
+        RCC_OscInitStruct.PLL.PLLM = HSE_VALUE / 5;
+        RCC_OscInitStruct.PLL.PLLN = 56;
+        RCC_OscInitStruct.PLL.PLLP = 5;
+        RCC_OscInitStruct.PLL.PLLQ = 5;
+        RCC_OscInitStruct.PLL.PLLR = 5;
+    }
+    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
+    {
+        return 0; // FAIL
+    }
+
+    /** Initializes the CPU, AHB and APB buses clocks
+    */
+    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
+                                |RCC_CLOCKTYPE_PCLK1;
+    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
+    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
+    {
+        return 0; // FAIL
+    }
+
+#if DEVICE_USBDEVICE
+    RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
+    PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_USB;
+    PeriphClkInitStruct.UsbClockSelection = RCC_USBCLKSOURCE_HSI48;
+    if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK) {
+        return 0; // FAIL
+    }	
+#endif /* DEVICE_USBDEVICE */
+    return 1; // OK
 }
 #endif /* ((CLOCK_SOURCE) & USE_PLL_HSE_XTAL) || ((CLOCK_SOURCE) & USE_PLL_HSE_EXTC) */
 
@@ -103,10 +170,10 @@ uint8_t SetSysClock_PLL_HSI(void)
      * in the RCC_OscInitTypeDef structure.
      */
     RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI|RCC_OSCILLATORTYPE_MSI | RCC_OSCILLATORTYPE_HSI48;
-    RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
     RCC_OscInitStruct.HSIState = RCC_HSI_ON;
-    RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
     RCC_OscInitStruct.MSIState = RCC_MSI_ON;
+    RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
+    RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
     RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
     RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_11;
     RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;

targets/targets.json5

@@ -4826,7 +4826,7 @@ mode is recommended for target MCUs with small amounts of flash and RAM.",
             "MCU_STM32U083xC"
         ],
 		 "overrides": {
-            "clock_source": "USE_PLL_HSI",
+            "clock_source": "USE_PLL_HSI", // Nucleo's default for the rest are necessary hardware changes
             "lse_available":  1,
             "default-adc-vref": 3.3
         },