Use LL libraries for C071R(8-B)T clock config

Also add support for Generic C071R8Tx

Author: thernstig

Diff for: README.md

@@ -214,7 +214,7 @@ User can add a STM32 based board following this [wiki](https://github.com/stm32d
 | :green_heart: | STM32C011J4<br>STM32C011J6 | Generic Board | *2.8.0* |  |
 | :green_heart: | STM32C031C4<br>STM32C031C6 | Generic Board | *2.5.0* |  |
 | :green_heart: | STM32C031F4<br>STM32C031F6 | Generic Board | *2.6.0* |  |
-| :green_heart: | STM32G071RB | Generic Board | *2.9.0* |  |
+| :yellow_heart: | STM32C071R8<br>STM32C071RB | Generic Board | **2.9.0** | |
 
 ### Generic STM32F0 boards
 

Diff for: boards.txt

@@ -1668,6 +1668,14 @@ GenC0.menu.pnum.GENERIC_C031F6PX.build.product_line=STM32C031xx
 GenC0.menu.pnum.GENERIC_C031F6PX.build.variant=STM32C0xx/C011D6Y_C011F(4-6)(P-U)_C031F(4-6)P
 GenC0.menu.pnum.GENERIC_C031F6PX.debug.svd_file={runtime.tools.STM32_SVD.path}/svd/STM32C0xx/STM32C031.svd
 
+# Generic C071R8Tx
+GenC0.menu.pnum.GENERIC_C071R8TX=Generic C071R8Tx
+GenC0.menu.pnum.GENERIC_C071R8TX.upload.maximum_size=65536
+GenC0.menu.pnum.GENERIC_C071R8TX.upload.maximum_data_size=24576
+GenC0.menu.pnum.GENERIC_C071R8TX.build.board=GENERIC_C071R8TX
+GenC0.menu.pnum.GENERIC_C071R8TX.build.product_line=STM32C071xx
+GenC0.menu.pnum.GENERIC_C071R8TX.build.variant=STM32C0xx/C071R(8-B)T
+
 # Generic C071RBTx
 GenC0.menu.pnum.GENERIC_C071RBTX=Generic C071RBTx
 GenC0.menu.pnum.GENERIC_C071RBTX.upload.maximum_size=131072

Diff for: variants/STM32C0xx/C071R(8-B)T/generic_clock.c

@@ -14,38 +14,38 @@
 #include "pins_arduino.h"
 
 /**
- * @brief  System Clock Configuration
- * @param  None
- * @retval None
- */
+  * @brief  System Clock Configuration
+  * @param  None
+  * @retval None
+  */
 WEAK void SystemClock_Config(void)
 {
-  RCC_OscInitTypeDef RCC_OscInitStruct = {};
-  RCC_ClkInitTypeDef RCC_ClkInitStruct = {};
+  LL_FLASH_SetLatency(LL_FLASH_LATENCY_1);
 
-  /** Initializes the RCC Oscillators according to the specified parameters
-   * in the RCC_OscInitTypeDef structure.
-   */
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI | RCC_OSCILLATORTYPE_HSI48;
-  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
-  RCC_OscInitStruct.HSIDiv = RCC_HSI_DIV1;
-  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
-  RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
+  /* HSI configuration and activation */
+  LL_RCC_HSI_Enable();
+  while (LL_RCC_HSI_IsReady() != 1)
+  {
+  }
 
-  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
+  LL_RCC_HSI_SetCalibTrimming(64);
+  LL_RCC_SetHSIDiv(LL_RCC_HSI_DIV_1);
+  /* Set AHB prescaler*/
+  LL_RCC_SetAHBPrescaler(LL_RCC_HCLK_DIV_1);
+
+  /* Sysclk activation on the HSI */
+  LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_HSI);
+  while (LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_HSI)
   {
-    Error_Handler();
   }
 
-  /** 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_HSI;
-  RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1;
-  RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV1;
-  RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV1;
+  /* Set APB1 prescaler*/
+  LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
+  /* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
+  LL_SetSystemCoreClock(48000000);
 
-  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
+  /* Update the time base */
+  if (HAL_InitTick(TICK_INT_PRIORITY) != HAL_OK)
   {
     Error_Handler();
   }