原创用最新库玩转智林STM32开发板(之三)------用自动重装载的PWM点亮真彩背光板

 2009-4-5 08:41  3077 8 8 分类: MCU/ 嵌入式

用最新库玩转智林STM32开发板(之三)------用自动重装载的PWM点亮真彩背光板

用最新库玩转智林STM32开发板------用自动重装载的PWM点亮真彩背光板

上次用的是TOGGLE,又用了中断功能,智林老大打来电话说我的不是真证的PWM,是用中断的,对下面要进行显示不利,我由是就把模式改下再发上来跟大家共享下,没想到我就改个模式为PWM1,把中断去掉就好用了,嘿嘿,看来还得去做,去做才是硬道理.

智林老大说,应好久不会再见到我发帖,原因是下面的例程是显示驱动,他说用库写这个很不容易,我想试下尽量快些传给大家.

由于最终目地是在屏幕上显示画面所以得用自动重装的PWM模式这样不会占资源.

本例共一个主程序,一个中断程序(中断其实没用,只不过是个空壳)一个编译好的库文件STM32F10XR.LIB,这个库文件可以在MDK的ARM\RV31\LIB\ST\找到

再加上启动文件不用变,其实就一个main.c是用编程的

大家可把main.c直接考到工程中

/*******************************************************************************
* File Name          : main.c
* Author             : ddllxxrr
* Date First Issued : 04/06/2009
* Description        : Main program body
********************************************************************************/

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_lib.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
vu16 CCR3_Val = 0x500;
ErrorStatus HSEStartUpStatus;

/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);

/* Private functions ---------------------------------------------------------*/

/*******************************************************************************
* Function Name : main
* Description    : Main program
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
debug();
#endif

/* System Clocks Configuration */
RCC_Configuration();

/* NVIC Configuration */
NVIC_Configuration();

/* GPIO Configuration */
GPIO_Configuration();

/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 0x5000;
TIM_TimeBaseStructure.TIM_Prescaler = 0x00;
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

/* Output Compare Toggle Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse =CCR3_Val ;
TIM_OC3Init(TIM2, &TIM_OCInitStructure);

/* TIM enable counter */
TIM_Cmd(TIM2, ENABLE);

/* TIM IT enable */
// TIM_ITConfig(TIM2, TIM_IT_CC3 , ENABLE);

while(1)
{
}
}

/*******************************************************************************
* 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/4 */
RCC_PCLK1Config(RCC_HCLK_Div4);

    /* 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)
    {
    }
}

/* TIM2 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

/* GPIOA clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
}

/*******************************************************************************
* Function Name : GPIO_Configuration
* Description    : Configure the TIM2 Pins.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

/* GPIOA Configuration:TIM2 Channel1, 2, 3 and 4 in Output */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA, &GPIO_InitStructure);
}

/*******************************************************************************
* Function Name : NVIC_Configuration
* Description    : Configure the nested vectored interrupt controller.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;

#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

/* Enable the TIM2 global Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

#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\r\n", file, line) */

while(1)
{
}
}
#endif
/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/