From: acezhao <acezhao@tencent.com>
Date: Sat, 25 May 2019 15:55:48 +0000 (+0800)
Subject: add system clock
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/Bv9ARM.ch09.html?a=commitdiff_plain;h=86d46dae8f351c9d6c36327dd5f2525857c1e58c;p=acecode.git

add system clock
---

diff --git a/learn/stm32/F103/src/main.c b/learn/stm32/F103/src/main.c
index da17e68..62a5b30 100644
--- a/learn/stm32/F103/src/main.c
+++ b/learn/stm32/F103/src/main.c
@@ -12,12 +12,15 @@
 #include "gpio.h"
 #include "rcc.h"
 
-#define APB2ENR (*(unsigned int*)(RCC_BASE+0x18))
 
-unsigned int pin = 8;
+unsigned int pin = 9;
 
 
 void SystemInit() {
+
+	InitSystemClock();
+
+
 	// 使能时钟
 	RCCEnableGPIOBClock();
 
@@ -25,12 +28,11 @@ void SystemInit() {
 }
 
 void delay() {
-	int i=65536;
+	int i=965536;
 	while(i--);
 }
 
 int main() {
-
 	while(1) {
 		GPIOWrite(GPIOB, pin, HIGH);
 		delay();
diff --git a/learn/stm32/F103/src/rcc.c b/learn/stm32/F103/src/rcc.c
index aee943b..2948ec5 100644
--- a/learn/stm32/F103/src/rcc.c
+++ b/learn/stm32/F103/src/rcc.c
@@ -10,3 +10,209 @@
 void __RCCEnableAPB2(uint32_t en) {
 	RCC->APB2ENR |= en;
 }
+
+
+#define RCC_CR_HSION	0x00000001
+#define RCC_CR_HSIRDY	0x00000002
+#define RCC_CR_HSEON 	0x00010000
+#define RCC_CR_HSERDY	0x00020000
+#define RCC_CR_HSEBYP	0x00040000
+#define RCC_CR_CSSON	0x00080000
+#define RCC_CR_PLLON	0x01000000
+#define RCC_CR_PLLRDY	0x02000000
+
+
+#define RCC_CFGR_HPRE_DIV_MASK    0x000000F0
+#define RCC_CFGR_HPRE_DIV1   0x00000000
+#define RCC_CFGR_HPRE_DIV2   0x00000080
+#define RCC_CFGR_HPRE_DIV4   0x00000090
+#define RCC_CFGR_HPRE_DIV8   0x000000A0
+#define RCC_CFGR_HPRE_DIV16  0x000000B0
+#define RCC_CFGR_HPRE_DIV64  0x000000C0
+#define RCC_CFGR_HPRE_DIV128 0x000000D0
+#define RCC_CFGR_HPRE_DIV256 0x000000E0
+#define RCC_CFGR_HPRE_DIV512 0x000000F0
+
+
+#define RCC_CFGR_PPRE1_DIV_MASK 0x0000007FF
+#define RCC_CFGR_PPRE1_DIV1	 0x00000000
+#define RCC_CFGR_PPRE1_DIV2  0x00000400
+#define RCC_CFGR_PPRE1_DIV4  0x00000500
+#define RCC_CFGR_PPRE1_DIV8  0x00000600
+#define RCC_CFGR_PPRE1_DIV16 0x00000700
+
+#define RCC_CFGR_PPRE2_DIV_MASK 0x000038FF
+#define RCC_CFGR_PPRE2_DIV1  0x00000000
+#define RCC_CFGR_PPRE2_DIV2  0x00002000
+#define RCC_CFGR_PPRE2_DIV4  0x00002800
+#define RCC_CFGR_PPRE2_DIV8  0x00003000
+#define RCC_CFGR_PPRE2_DIV16 0x00003800
+
+#define RCC_CFGR_PLLMULL_MASK 0x003C0000
+#define RCC_CFGR_PLLMULL_2 	 0x00000000
+#define RCC_CFGR_PLLMULL_3 	 0x00040000
+#define RCC_CFGR_PLLMULL_4 	 0x00080000
+#define RCC_CFGR_PLLMULL_5 	 0x000C0000
+#define RCC_CFGR_PLLMULL_6 	 0x00100000
+#define RCC_CFGR_PLLMULL_7 	 0x00140000
+#define RCC_CFGR_PLLMULL_8 	 0x00180000
+#define RCC_CFGR_PLLMULL_9 	 0x001C0000
+#define RCC_CFGR_PLLMULL_10	 0x00200000
+#define RCC_CFGR_PLLMULL_11	 0x00200000
+#define RCC_CFGR_PLLMULL_12	 0x00280000
+#define RCC_CFGR_PLLMULL_13	 0x002C0000
+#define RCC_CFGR_PLLMULL_14	 0x00300000
+#define RCC_CFGR_PLLMULL_15	 0x00340000
+#define RCC_CFGR_PLLMULL_16	 0x00380000
+
+
+#define RCC_CFGR_PLLXTYPE_MASK		0x00020000
+#define RCC_CFGR_PLLXTYPE_HSE		0x00000000
+#define RCC_CFGR_PLLXTYPE_HSE_HALF	0x00020000
+
+#define RCC_CFGR_PLLSRC_MASK 0x00010000
+#define RCC_CFGR_PLLSRC_HSI	 0x00000000
+#define RCC_CFGR_PLLSRC_HSE	 0x00010000
+
+#define RCC_CFGR_SW_MASK	0x00000003
+#define RCC_CFGR_SW_HSI		0x00000000
+#define RCC_CFGR_SW_HSE		0x00000001
+#define RCC_CFGR_SW_PLL		0x00000002
+
+
+
+
+#define HSE_STARTUP_TIMEOUT	0x500
+
+
+typedef struct
+{
+  volatile uint32_t ACR;
+  volatile uint32_t KEYR;
+  volatile uint32_t OPTKEYR;
+  volatile uint32_t SR;
+  volatile uint32_t CR;
+  volatile uint32_t AR;
+  volatile uint32_t RESERVED;
+  volatile uint32_t OBR;
+  volatile uint32_t WRPR;
+} FLASH_t;
+
+
+#define FLASH_R_BASE          	(AHBPERIPH_BASE + 0x2000)
+#define FLASH               	((FLASH_t *) FLASH_R_BASE)
+#define  FLASH_ACR_LATENCY_2    ((uint8_t)0x02)
+#define FLASH_ACR_PRFTBE        ((uint8_t)0x10)
+#define  FLASH_ACR_LATENCY      ((uint8_t)0x03)
+
+void SetSystemClock72MHz() {
+
+
+	RCC->CR |= RCC_CR_HSEON;
+
+	volatile uint32_t StartupCnt = 0;
+	volatile uint32_t Status = 0;
+
+	do {
+		Status = RCC->CR & RCC_CR_HSERDY;
+		StartupCnt++;
+	} while(Status == 0 && StartupCnt < HSE_STARTUP_TIMEOUT);
+
+
+
+	// APB1 PRE
+	RCC->CFGR &= ~RCC_CFGR_PPRE1_DIV_MASK;
+	RCC->CFGR |= RCC_CFGR_PPRE1_DIV2;
+
+	// APB2 PRE
+	RCC->CFGR &= ~RCC_CFGR_PPRE2_DIV_MASK;
+	RCC->CFGR |= RCC_CFGR_PPRE2_DIV1;
+
+
+	FLASH->ACR |= FLASH_ACR_PRFTBE;
+	FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
+	FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2;
+
+	// 以下设置需要关闭PLL
+	RCC->CR &= ~RCC_CR_PLLON;
+
+	// PLLMUL
+	RCC->CFGR &= ~RCC_CFGR_PLLMULL_MASK;
+	RCC->CFGR |= RCC_CFGR_PLLMULL_6;  // OneNet Mini板上是接的12MHz晶振，所以倍数为6就能得到72MHz
+
+
+	// XTYPE: select HSE
+	RCC->CFGR &= ~RCC_CFGR_PLLXTYPE_MASK;
+	RCC->CFGR |= RCC_CFGR_PLLXTYPE_HSE;
+
+	// PLLSRC: select PLLSRC
+	RCC->CFGR &= ~RCC_CFGR_PLLSRC_MASK;
+	RCC->CFGR |= RCC_CFGR_PLLSRC_HSE;
+
+	// SW: System Clock Switch
+	RCC->CFGR &= ~RCC_CFGR_SW_MASK;
+	RCC->CFGR |= RCC_CFGR_SW_PLL;
+
+
+	RCC->CR |= RCC_CR_PLLON;
+	while(RCC->CR & RCC_CR_PLLON == 0) { }
+}
+
+void InitSystemClock() {
+	SetSystemClock72MHz();
+	return;
+	// 启动HSI
+	RCC->CR |= RCC_CR_HSION;
+
+	// WAIT HSI
+
+	// SW： System Close Switch 重置为 HSI
+	RCC->CFGR &= ~(0xF << 0);
+
+
+	// HPRE: AHB预分频设置为不分频，即SYSCLK->HCLK不被分频
+	RCC->CFGR &= ~(0xF << 4);
+
+
+	// PPRE1: APB1预分频设置为不分频，即HCLK->PCLK1不被分频
+	// 此处软件必需保证频率不能超过36MHz
+	RCC->CFGR &= ~(0x7 << 8);
+
+	// PPRE2: APB2预分频系数设置为不分频，即HCLK->PCLK2不被分频
+	RCC->CFGR &= ~(0x7 << 11);
+
+
+	// ADCPRE: ADC预分频系统设置为2分频,即PCLK2/2->ADCCLK
+	RCC->CFGR &= ~(0x3 << 14);
+
+	// MCO: Mironcontroller Clock Output 禁止时钟输出
+	RCC->CFGR &= ~(0x7 << 24);
+
+	// 关闭HSE
+	RCC->CR &= ~RCC_CR_HSEON;
+
+	// 关闭CSS
+	RCC->CR &= ~RCC_CR_CSSON;
+
+	// 关闭PLL
+	RCC->CR &= ~RCC_CR_PLLON;
+
+	// External High Speed Clock Ready Flag
+	// 外部调整时钟没有旁路
+	// 只有在外部4-16MHz振荡器关闭的情况下，才能写入该位。
+	RCC->CR &= ~RCC_CR_HSEBYP;
+
+	// 后续三项设置需要在PLL关闭的情况下进行才有效
+	// PLL Src 设置为 HSI经2分频后输入
+	RCC->CFGR &= ~(0x1 << 16);
+
+	// PLLXTYPE 设置为HSE不分频输入
+	RCC->CFGR &= ~(0x1 << 17);
+	//RCC->CFGR |= 0x1 << 17;
+
+	// PLLMUL 倍频系数设置为 2
+	RCC->CFGR &= ~(0xF << 18);
+
+	// USBPRE: USB预分频系数设置为1.5
+	RCC->CFGR &= (~0x1) << 22;
+}
diff --git a/learn/stm32/F103/src/rcc.h b/learn/stm32/F103/src/rcc.h
index 23370aa..96a0445 100644
--- a/learn/stm32/F103/src/rcc.h
+++ b/learn/stm32/F103/src/rcc.h
@@ -41,4 +41,6 @@ void __RCCEnableAPB2(uint32_t en);
 #define RCCEnableGPIODClock() __RCCEnableAPB2(RCC_APB2ENR_IOPDEN)
 #define RCCEnableGPIOEClock() __RCCEnableAPB2(RCC_APB2ENR_IOPEEN)
 
+void InitSystemClock();
+
 #endif /* RCC_H_ */