From: AceVest <zhaoyanbai@126.com>
Date: Sat, 1 Jun 2019 08:03:10 +0000 (+0800)
Subject: SysClk手动设置为72MHz，时钟切为外部高速时钟HSE
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/zlib_tech.html?a=commitdiff_plain;h=fb85e70368a47ebaa1b6bcdf7459d91d929d9bf4;p=acecode.git

SysClk手动设置为72MHz，时钟切为外部高速时钟HSE
---

diff --git a/learn/stm32/F103HAL/Src/System.c b/learn/stm32/F103HAL/Src/System.c
index 3abf807..ee1d86b 100644
--- a/learn/stm32/F103HAL/Src/System.c
+++ b/learn/stm32/F103HAL/Src/System.c
@@ -9,24 +9,71 @@
 #include "stm32f1xx_hal.h"
 
 void SystemPreInit() {
-	__HAL_RCC_GPIOB_CLK_ENABLE();
+
 }
 
 
 #define LED_Pin 		GPIO_PIN_6
 #define LED_GPIO_Port	GPIOB
 
-void SystemSetup() {
+void SystemClock_Init() {
+	RCC_OscInitTypeDef	RCC_OscInitStruct;
+	RCC_OscInitStruct.HSEPredivValue	= RCC_HSE_PREDIV_DIV1;
+	RCC_OscInitStruct.HSEState			= RCC_HSE_ON;
+	RCC_OscInitStruct.HSIState			= RCC_HSI_ON;
+	RCC_OscInitStruct.LSEState			= RCC_LSE_OFF;
+	RCC_OscInitStruct.LSIState			= RCC_LSI_OFF;
+	RCC_OscInitStruct.PLL.PLLMUL		= RCC_PLL_MUL6;			// 外部晶振是12MHz，所以为了得到72MHz，只需要乘以6
+	RCC_OscInitStruct.PLL.PLLSource		= RCC_PLLSOURCE_HSE;
+	RCC_OscInitStruct.PLL.PLLState		= RCC_PLL_ON;
+	RCC_OscInitStruct.OscillatorType	= RCC_OSCILLATORTYPE_HSI | RCC_OSCILLATORTYPE_HSE | RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
+	if(HAL_OK != HAL_RCC_OscConfig(&RCC_OscInitStruct)) {
+		Error_Handler();
+	}
+
+	RCC_ClkInitTypeDef RCC_ClkInitStruct;
+	RCC_ClkInitStruct.AHBCLKDivider	= RCC_SYSCLK_DIV1;
+	RCC_ClkInitStruct.APB1CLKDivider= RCC_HCLK_DIV2;
+	RCC_ClkInitStruct.APB2CLKDivider= RCC_HCLK_DIV1;
+	RCC_ClkInitStruct.SYSCLKSource	= RCC_SYSCLKSOURCE_PLLCLK;
+	RCC_ClkInitStruct.ClockType		= RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK1;
+	if(HAL_OK != HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2)) {
+		Error_Handler();
+	}
+}
+
+void GPIO_Init() {
+	__HAL_RCC_GPIOB_CLK_ENABLE();
+	// GPIO 初始化，需要启用相应GPIO Port的时钟
 	GPIO_InitTypeDef GPIO_InitStruct;
 	GPIO_InitStruct.Mode	= GPIO_MODE_OUTPUT_OD;
 	GPIO_InitStruct.Pin		= LED_Pin;
 	GPIO_InitStruct.Pull	= GPIO_NOPULL;
 	GPIO_InitStruct.Speed	= GPIO_SPEED_FREQ_HIGH;
-
 	HAL_GPIO_Init(LED_GPIO_Port, &GPIO_InitStruct);
 }
 
+
+void SystemSetup() {
+
+	HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_2);
+
+	SystemClock_Init();
+
+	GPIO_Init();
+}
+
 void SystemLoop() {
 	HAL_GPIO_TogglePin(LED_GPIO_Port, LED_Pin);
 	HAL_Delay(1000);
 }
+
+
+void SystemEntry() {
+
+	SystemSetup();
+
+	while(1) {
+		SystemLoop();
+	}
+}
diff --git a/learn/stm32/F103HAL/Src/main.c b/learn/stm32/F103HAL/Src/main.c
index e6d0a59..4a05107 100644
--- a/learn/stm32/F103HAL/Src/main.c
+++ b/learn/stm32/F103HAL/Src/main.c
@@ -56,9 +56,7 @@ void SystemClock_Config(void);
 
 /* Private user code ---------------------------------------------------------*/
 /* USER CODE BEGIN 0 */
-void SystemPreInit();
-void SystemSetup();
-void SystemLoop();
+void SystemEntry();
 /* USER CODE END 0 */
 
 /**
@@ -68,7 +66,8 @@ void SystemLoop();
 int main(void)
 {
   /* USER CODE BEGIN 1 */
-
+	SystemEntry();
+	return 0; // never
   /* USER CODE END 1 */
   
 
@@ -85,20 +84,19 @@ int main(void)
   SystemClock_Config();
 
   /* USER CODE BEGIN SysInit */
-  SystemPreInit();
+
   /* USER CODE END SysInit */
 
   /* Initialize all configured peripherals */
   MX_GPIO_Init();
   /* USER CODE BEGIN 2 */
-  SystemSetup();
+
   /* USER CODE END 2 */
 
   /* Infinite loop */
   /* USER CODE BEGIN WHILE */
   while (1)
   {
-	  SystemLoop();
     /* USER CODE END WHILE */
 
     /* USER CODE BEGIN 3 */