174 lines
5.6 KiB
C
174 lines
5.6 KiB
C
#include "sys.h"
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#include "delay.h"
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#include "pwm.h"
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#include "includes.h" //ucos Use
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//////////////////////////////////////////////////////////////////////////////////
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//This program is for educational purposes only, without the author's permission, may not be used for any other purpose
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//ALIENTEK STM32F4 Explorer Board
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//Initialize serial port 2
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//Hot Atomic @ALIENTEK
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//Forum: www.openedv.com
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//Date modified: 2015/9/12
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//Version: V1.0
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//All rights reserved pirated reserved.
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//Copyright(C) Guangzhou wing electronic technology limited company 2009-2019
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//All rights reserved
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//********************************************************************************
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//////////////////////////////////////////////////////////////////////////////////
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/* Defines -------------------------------------------------------------------*/
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/* Type declarations ---------------------------------------------------------*/
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/* Exported macro ------------------------------------------------------------*/
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void TM_OC_Init(void);
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void TM_TIMER_Init(void);
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void TM_PWM_Init(void);
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void PWM_Init(void)
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{
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/* Init OC */
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TM_OC_Init();
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/* Init timer */
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TM_TIMER_Init();
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/* Init PWM */
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TM_PWM_Init();
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}
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void TM_OC_Init(void)
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{
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GPIO_InitTypeDef GPIO_InitStruct;
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/* Clock for GPIOD */
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RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
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/* Alternating functions for pins */
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GPIO_PinAFConfig(GPIOD, GPIO_PinSource15, GPIO_AF_TIM4);
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/* Set pins */
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GPIO_InitStruct.GPIO_Pin = GPIO_Pin_15;
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GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
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GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
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GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
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GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz;
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GPIO_Init(GPIOD, &GPIO_InitStruct);
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}
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void TM_TIMER_Init(void)
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{
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TIM_TimeBaseInitTypeDef TIM_BaseStruct;
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/* Enable clock for TIM4 */
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
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/*
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TIM4 is connected to APB1 bus, which has on F407 device 42MHz clock
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But, timer has internal PLL, which double this frequency for timer, up to 84MHz
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Remember: Not each timer is connected to APB1, there are also timers connected
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on APB2, which works at 84MHz by default, and internal PLL increase
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this to up to 168MHz
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Set timer prescaler
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Timer count frequency is set with
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timer_tick_frequency = Timer_default_frequency / (prescaller_set + 1)
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In our case, we want a max frequency for timer, so we set prescaller to 0
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And our timer will have tick frequency
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timer_tick_frequency = 84000000 / (0 + 1) = 84000000
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*/
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TIM_BaseStruct.TIM_Prescaler = 0;
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/* Count up */
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TIM_BaseStruct.TIM_CounterMode = TIM_CounterMode_Up;
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/*
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Set timer period when it have reset
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First you have to know max value for timer
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In our case it is 16bit = 65535
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To get your frequency for PWM, equation is simple
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PWM_frequency = timer_tick_frequency / (TIM_Period + 1)
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If you know your PWM frequency you want to have timer period set correct
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TIM_Period = timer_tick_frequency / PWM_frequency - 1
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In our case, for 10Khz PWM_frequency, set Period to
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TIM_Period = 84000000 / 10000 - 1 = 8399
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If you get TIM_Period larger than max timer value (in our case 65535),
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you have to choose larger prescaler and slow down timer tick frequency
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*/
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TIM_BaseStruct.TIM_Period = 8399; /* 10kHz PWM */
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TIM_BaseStruct.TIM_ClockDivision = TIM_CKD_DIV1;
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TIM_BaseStruct.TIM_RepetitionCounter = 0;
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/* Initialize TIM4 */
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TIM_TimeBaseInit(TIM4, &TIM_BaseStruct);
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/* Start count on TIM4 */
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TIM_Cmd(TIM4, ENABLE);
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}
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void TM_PWM_Init(void)
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{
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TIM_OCInitTypeDef TIM_OCStruct;
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/* Common settings */
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/* PWM mode 2 = Clear on compare match */
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/* PWM mode 1 = Set on compare match */
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TIM_OCStruct.TIM_OCMode = TIM_OCMode_PWM2;
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TIM_OCStruct.TIM_OutputState = TIM_OutputState_Enable;
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TIM_OCStruct.TIM_OCPolarity = TIM_OCPolarity_Low;
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/*
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To get proper duty cycle, you have simple equation
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pulse_length = ((TIM_Period + 1) * DutyCycle) / 100 - 1
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where DutyCycle is in percent, between 0 and 100%
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25% duty cycle: pulse_length = ((8399 + 1) * 25) / 100 - 1 = 2099
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50% duty cycle: pulse_length = ((8399 + 1) * 50) / 100 - 1 = 4199
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75% duty cycle: pulse_length = ((8399 + 1) * 75) / 100 - 1 = 6299
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100% duty cycle: pulse_length = ((8399 + 1) * 100) / 100 - 1 = 8399
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Remember: if pulse_length is larger than TIM_Period, you will have output HIGH all the time
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*/
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// TIM_OCStruct.TIM_Pulse = 2099; /* 25% duty cycle */
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// TIM_OC1Init(TIM4, &TIM_OCStruct);
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// TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable);
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TIM_OCStruct.TIM_Pulse = 6299; /* 50% duty cycle */
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TIM_OC4Init(TIM4, &TIM_OCStruct);
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TIM_OC4PreloadConfig(TIM4, TIM_OCPreload_Enable);
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// TIM_OCStruct.TIM_Pulse = 6299; /* 75% duty cycle */
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// TIM_OC3Init(TIM4, &TIM_OCStruct);
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// TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable);
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// TIM_OCStruct.TIM_Pulse = 8399; /* 100% duty cycle */
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// TIM_OC4Init(TIM4, &TIM_OCStruct);
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// TIM_OC4PreloadConfig(TIM4, TIM_OCPreload_Enable);
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}
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void TM_PWM_PulseSet(u32 aPulse)
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{
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switch (aPulse)
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{
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case 0:
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TIM_SetCompare4(TIM4, 2099); /* 25% duty cycle */
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break;
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case 1:
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TIM_SetCompare4(TIM4, 4199); /* 50% duty cycle */
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break;
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case 2:
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TIM_SetCompare4(TIM4, 6299); /* 75% duty cycle */
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break;
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case 3:
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TIM_SetCompare4(TIM4, 8399); /* 100% duty cycle */
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break;
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}
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}
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