Diff: main.cpp

Revision:

0:6c856a0de933

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Jan 31 09:20:00 2019 +0000
@@ -0,0 +1,83 @@
+#include "mbed.h"
+DigitalOut pt(PC_4);
+
+Serial pc(USBTX, USBRX);
+ 
+void SystemClock_Config(void);
+
+      
+int main()
+{
+   int dbgCount;
+
+   dbgCount=0;
+   //SystemClock_Config();
+   pc.baud(115200);
+   printf("CPU SystemCoreClock is %d Hz\r\n", SystemCoreClock);  
+   while(1)
+   {
+        printf("\r\n%d",dbgCount++);
+        wait(1);   
+   }
+}
+
+void SystemClock_Config(void)
+{
+     GPIO_InitTypeDef InitStruct;
+    
+    
+    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
+    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
+ 
+    /* MSI 2 MHz as source clock for Low Power Run mode */
+    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
+    RCC_OscInitStruct.MSIState = RCC_MSI_ON;
+    RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_5; // 2 MHz
+    RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
+    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_OFF;
+    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
+        // Error
+    }
+ 
+    /* 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_MSI;
+    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
+    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
+    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK) {
+        printf("\r\n!!! MainClock configuration failure, case #1\r\n");
+    }
+ 
+    /* 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.  */
+ 
+    /* Enable Power Control clock */
+    __HAL_RCC_PWR_CLK_ENABLE();
+ 
+    if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE2) != HAL_OK) {
+        printf("\r\n!!! MainClock configuration failure, case #2\r\n");
+    }
+ 
+    /* Enter Low Power Run mode */
+    HAL_PWREx_EnableLowPowerRunMode();
+ 
+    /* Disable Power Control clock */
+    __HAL_RCC_PWR_CLK_DISABLE();
+ 
+    SystemCoreClockUpdate();
+    
+   ///////////////////////////////////Ouputing sysclock / 16 for control
+    HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_SYSCLK, RCC_MCODIV_16);   // select PLLCLK as source
+ 
+ 
+    /*Configure GPIO pin to output clock signal at  PA8 */
+      InitStruct.Pin = GPIO_PIN_8;
+      InitStruct.Mode = GPIO_MODE_AF_PP;
+      InitStruct.Pull = GPIO_NOPULL;
+      InitStruct.Speed = GPIO_SPEED_HIGH;
+      InitStruct.Alternate = GPIO_AF0_MCO;
+      HAL_GPIO_Init(GPIOA, &InitStruct);  
+} 
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