Diff: main.cpp

Revision:

0:882187e7521f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Dec 27 18:57:19 2018 +0000
@@ -0,0 +1,89 @@
+#include "mbed.h"
+
+//------------------------------------
+// Hyperterminal configuration
+// 9600 bauds, 8-bit data, no parity
+//------------------------------------
+
+Serial pc(SERIAL_TX, SERIAL_RX);
+
+// DigitalOut myled(LED1);
+//DigitalOut myled(D8);
+
+uint8_t MY_SetSysClock_PLL_HSE(uint8_t bypass)
+{
+    RCC_ClkInitTypeDef RCC_ClkInitStruct;
+    RCC_OscInitTypeDef RCC_OscInitStruct;
+    RCC_PeriphCLKInitTypeDef RCC_PeriphClkInit;
+
+    /* Used to gain time after DeepSleep in case HSI is used */
+    if (__HAL_RCC_GET_FLAG(RCC_FLAG_HSIRDY) != RESET) {
+        return 0;
+    }
+
+    /* The voltage scaling allows optimizing the power consumption when the device is
+       clocked below the maximum system frequency, to update the voltage scaling value
+       regarding system frequency refer to product datasheet. */
+    __PWR_CLK_ENABLE();
+    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
+
+    /* Enable HSE and HSI48 oscillators and activate PLL with HSE as source */
+    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE|RCC_OSCILLATORTYPE_HSI48;
+    if (bypass == 0) {
+        RCC_OscInitStruct.HSEState          = RCC_HSE_ON; /* External 8 MHz xtal on OSC_IN/OSC_OUT */
+    } else {
+        RCC_OscInitStruct.HSEState          = RCC_HSE_BYPASS; /* External 8 MHz clock on OSC_IN */
+    }
+    RCC_OscInitStruct.HSIState            = RCC_HSI_OFF;
+    RCC_OscInitStruct.HSI48State          = RCC_HSI48_ON; /* For USB and RNG clock */
+    // PLLCLK = (8 MHz * 8)/2 = 32 MHz
+    RCC_OscInitStruct.PLL.PLLState        = RCC_PLL_ON;
+    RCC_OscInitStruct.PLL.PLLSource       = RCC_PLLSOURCE_HSE;
+    RCC_OscInitStruct.PLL.PLLMUL          = RCC_PLLMUL_8;
+    RCC_OscInitStruct.PLL.PLLDIV          = RCC_PLLDIV_2;
+    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
+        return 0; // FAIL
+    }
+
+    /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
+    RCC_ClkInitStruct.ClockType      = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+    RCC_ClkInitStruct.SYSCLKSource   = RCC_SYSCLKSOURCE_PLLCLK; // 32 MHz
+    RCC_ClkInitStruct.AHBCLKDivider  = RCC_SYSCLK_DIV1;         // 32 MHz
+    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;           // 32 MHz
+    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;           // 32 MHz
+    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK) {
+        return 0; // FAIL
+    }
+
+    RCC_PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USB;
+    RCC_PeriphClkInit.UsbClockSelection = RCC_USBCLKSOURCE_HSI48;
+    if (HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphClkInit) != HAL_OK) {
+        return 0; // FAIL
+    }
+
+    return 1; // OK
+}
+
+int main()
+{
+// RCC->CR|= (uint32_t)0x03030300U;
+
+ //RCC->CR &= (uint32_t)0xFCFCFCFFU;
+ 
+ //RCC->CR |= RCC_CR_CSSHSEON | RCC_CR_HSEBYP | RCC_CR_HSEON;
+ 
+ //RCC->CR |= RCC_CR_CSSHSEON | RCC_CR_HSEON;
+ 
+//  RCC->CR &= (uint32_t)0xFEF4FFFFU;
+ // RCC->CR |= (uint32_t)0x00000100U;
+     
+ 
+ HAL_RCC_DeInit();
+// RCC->CR |= RCC_CR_CSSHSEON | RCC_CR_HSEON; 
+// while(1
+MY_SetSysClock_PLL_HSE(0);
+
+ pc.printf("\n 2SystemCoreClock of PCB= %d, %08X", SystemCoreClock, RCC->CR);
+
+    
+}