STM32跑72MHz比36MHz快不了一倍．
STM32跑72MHz可能比LM3S跑50MHz还要慢（浮点数运算）
测试环境
软件:keil ARM3.11 第二级优化
LM3S硬件: EasyARM8962开发板 测量LED3闪烁周期
STM硬件：EK-STM32F开发板 测量LD2闪烁周期
LM3S程序:
#include "hw_memmap.h"
#include "hw_types.h"
#include "gpio.h"
#include "sysctl.h"
#define PINS GPIO_PIN_6 //8962开发板LED3
#define N (1024)
//int a[N],b[N],c[N]; //LED3输出周期76.4ms
float a[N],b[N],c[N]; //LED3输出周期401.4ms
void test(int t)
{
int i;
int count;
for(count=0;count<50;count++)
{
t += count;
for(i=0;i<N;i++)
{
a = t*i;
}
for(i=0;i<N;i++)
{
b = t+i;
}
for(i=0;i<N;i++)
{
c = a * b / (i+1);
}
}
}//void test(int t)
/*********************************************************************************************************
** Function name: main
** Descriptions: 主函数
** input parameters: 无
** output parameters: 无
** Returned value: 无
*********************************************************************************************************/
int main(void)
{
SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN |
SYSCTL_XTAL_6MHZ);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
GPIOPadConfigSet(GPIO_PORTB_BASE, PINS,
GPIO_STRENGTH_4MA,
GPIO_PIN_TYPE_STD);
GPIODirModeSet(GPIO_PORTB_BASE, PINS, GPIO_DIR_MODE_OUT);
while(1) {
GPIOPinWrite(GPIO_PORTB_BASE, PINS, PINS);
test(100);
GPIOPinWrite(GPIO_PORTB_BASE, PINS, ~PINS);
test(200);
}
}
/*********************************************************************************************************
END FILE
*********************************************************************************************************/
STM32程序:
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_lib.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
#define N (1024)
GPIO_InitTypeDef GPIO_InitStructure;
ErrorStatus HSEStartUpStatus;
//int a[N],b[N],c[N]; //EK-STM32F开发板LD2输出周期73.0ms
float a[N],b[N],c[N]; //EK-STM32F开发板LD2输出周期420.2ms
void test(int t)
{
int i;
int count;
for(count=0;count<50;count++)
{
t += count;
for(i=0;i<N;i++)
{
a = t*i;
}
for(i=0;i<N;i++)
{
b = t+i;
}
for(i=0;i<N;i++)
{
c = a * b / (i+1);
}
}
}//void test(int t)
/*******************************************************************************
* Function Name : RCC_Configuration
* Description : Configures the different system clocks.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void RCC_Configuration(void)
{
/* RCC system reset(for debug purpose) */
RCC_DeInit();
/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON);
/* Wait till HSE is ready */
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS)
{
/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);
/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);
/* PCLK1 = HCLK/2 */
RCC_PCLK1Config(RCC_HCLK_Div2);
/* Flash 2 wait state */
FLASH_SetLatency(FLASH_Latency_2);
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
/* PLLCLK = 8MHz * 9 = 72 MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
/* Enable PLL */
RCC_PLLCmd(ENABLE);
/* Wait till PLL is ready */
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{
}
/* Select PLL as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
/* Wait till PLL is used as system clock source */
while(RCC_GetSYSCLKSource() != 0x08)
{
}
}
}
/*******************************************************************************
* Function Name : NVIC_Configuration
* Description : Configures Vector Table base location.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void NVIC_Configuration(void)
{
#ifdef VECT_TAB_RAM
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
}
/*******************************************************************************
* Function Name : main
* Description : Main program.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
debug();
#endif
/* Configure the system clocks */
RCC_Configuration();
/* NVIC Configuration */
NVIC_Configuration();
// Enable GPIOC clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 ;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* Infinite loop */
while (1)
{
GPIO_WriteBit(GPIOC,GPIO_Pin_7,Bit_SET);
test(100);
GPIO_WriteBit(GPIOC,GPIO_Pin_7,Bit_RESET);
test(200);
}
}
#ifdef DEBUG
/*******************************************************************************
* Function Name : assert_failed
* Description : Reports the name of the source file and the source line number
* where the assert error has occurred.
* Input : - file: pointer to the source file name
* - line: assert error line source number
* Output : None
* Return : None
*******************************************************************************/
void assert_failed(u8* file, u32 line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d
", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/
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