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main.c
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main.c
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/**
******************************************************************************
* @file main.c
* @author MCD Application Team
* @version V1.0.0
* @date 19-September-2011
* @brief Main program body
******************************************************************************
* @attention
*
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
* TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*
* <h2><center>© COPYRIGHT 2011 STMicroelectronics</center></h2>
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "main.h"
//Library config for this project!!!!!!!!!!!
#include "stm32f4xx_conf.h"
/** @addtogroup STM32F4-Discovery_PWM_Output_Demo
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void TIM_Configuration(void);
void GPIO_Configuration(void);;
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program.
* @param None
* @retval None
*/
int main(void)
{
volatile int i;
int n = 1;
uint16_t brightness = 0;
uint16_t who_run = 1;
RCC_Configuration();
TIM_Configuration();
GPIO_Configuration();
while(1) // Do not exit
{
if(brightness + n <= 0)
who_run = (who_run + 1) % 4;
if (((brightness + n) >= 3000) || ((brightness + n) <= 0))
n = -n; // if brightness maximum/maximum change direction
brightness += n;
// TIM4->CCR1 = brightness - 1;
// TIM4->CCR2 = brightness - 1;
// TIM4->CCR3 = brightness - 1;
// TIM4->CCR4 = brightness - 1;
//Light LEDs in turn
switch(who_run){
case 0:
TIM4->CCR1 = brightness - 1; // set brightness
break;
case 1:
TIM4->CCR2 = brightness - 1; // set brightness
break;
case 2:
TIM4->CCR3 = brightness - 1; // set brightness
break;
case 3:
TIM4->CCR4 = brightness - 1; // set brightness
break;
}
for(i=0;i<10000;i++); // delay
}
return(0); // System will implode
}
/**
* @brief Configures the different system clocks.
* @param None
* @retval None
*/
void RCC_Configuration(void)
{
RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_GPIOD , ENABLE );
RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM4, ENABLE );
}
/**
* @brief configure the PD12~15 to Timers
* @param None
* @retval None
*/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_StructInit(&GPIO_InitStructure); // Reset init structure
GPIO_PinAFConfig(GPIOD, GPIO_PinSource12, GPIO_AF_TIM4);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource13, GPIO_AF_TIM4);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource14, GPIO_AF_TIM4);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource15, GPIO_AF_TIM4);
// Setup Blue & Green LED on STM32-Discovery Board to use PWM.
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13| GPIO_Pin_14| GPIO_Pin_15; //PD12->LED3 PD13->LED4 PD14->LED5 PD15->LED6
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; // Alt Function - Push Pull
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init( GPIOD, &GPIO_InitStructure );
}
/**
* @brief configure the TIM4 for PWM mode
* @param None
* @retval None
*/
void TIM_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
TIM_OCInitTypeDef TIM_OCInitStruct;
// Let PWM frequency equal 100Hz.
// Let period equal 1000. Therefore, timer runs from zero to 1000. Gives 0.1Hz resolution.
// Solving for prescaler gives 240.
TIM_TimeBaseStructInit( &TIM_TimeBaseInitStruct );
TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV4;
TIM_TimeBaseInitStruct.TIM_Period = 1680 - 1;
TIM_TimeBaseInitStruct.TIM_Prescaler = 500 - 1;
TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit( TIM4, &TIM_TimeBaseInitStruct );
TIM_OCStructInit( &TIM_OCInitStruct );
TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1;
// Initial duty cycle equals 0%. Value can range from zero to 65535.
//TIM_Pulse = TIM4_CCR1 register (16 bits)
TIM_OCInitStruct.TIM_Pulse = 65535; //(0=Always Off, 65535=Always On)
TIM_OC1Init( TIM4, &TIM_OCInitStruct ); // Channel 1 LED
TIM_OC2Init( TIM4, &TIM_OCInitStruct ); // Channel 2 LED
TIM_OC3Init( TIM4, &TIM_OCInitStruct ); // Channel 3 LED
TIM_OC4Init( TIM4, &TIM_OCInitStruct ); // Channel 4 LED
TIM_Cmd( TIM4, ENABLE );
}
/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/