"One, Open the file (which can be downloaded and placed in the document)（ (as shown in Figure 1 below)
Figure 1
2、 Adjust the virtual device and save the project file as（ (as shown in Figure 2, 3 and 4 below)
Figure 2
Figure 3
Figure 4
3、 Click the source code tab（ (as shown in Figure 5 below)
Figure 5
4、 Edit the codes of main. C, timer. C, timer. H, key. C, key. H, led. C and led. H, as shown in proteus8.9 simulation stm32407zgt6 Series 001 (as shown in Figure 6 below)
Figure 6
5、 Main. C code:
/* Main.c file generated by New Project wizard
* Author： Ziegler Yin
* Created: Thursday January 16 2020
* Processor: STM32F407ZGT6ZGT6
* Compiler: GCC for ARM
*/
#include ""mfuncs.h""
#include ""delay.h""
#include ""usart.h""
#include ""led.h""
#include ""key.h""
#include ""TImer.h""
#define RT(A , B) (A> 300)? ( B= 0): ( B=1)
int main(void)
{
u16 pwmval=0;
u8 dir=1;
NVIC_ PriorityGroupConfig(NVIC_ PriorityGroup_ 2);// Set system interrupt priority group 2
delay_ init(168); // Initialization delay function
uart_ init(9600);// The baud rate of initialization serial port is 115200
LED_ Init();
KEY_ Init();
Uprint ("" Hello everyone\ r\n"");
Let's build a ventilator\ r\n"");
Uprint ("" control chip stm32f407zgt6_ 008_ PWM simulation begins\ r\n"");
LED0= LED1= LED2= 1;
TIM4_ PWM_ Init(500-1,840-1); // 84m / 84 = 1MHz counting frequency, reload value 500, so PWM frequency is 1m / 500 = 2KHz
TIM_ SetCompare1(TIM4, pwmval);
While (1) / / the comparison value is incremented from 0-300 to 300 and then decremented from 300-0. The loop
{
Uprint ("" arm runtime... \ R \ n "");
if(1==ReadKey(GPIOC, 0x0010)) {
LED0= 1;
Uprint ("" duty cycle increase... \ R \ n "");
if(dir) pwmval+=10;
RT(pwmval , dir);
} if(1==ReadKey(GPIOC, 0x0020)) {
LED1= 1;
Uprint ("" duty cycle reset... \ R \ n "");
if(dir) pwmval= 0;
RT(pwmval , dir);
} if(1==ReadKey(GPIOC, 0x0040)) {
LED2= 1;
Uprint ("" duty cycle reduction... \ R \ n "");
if(dir) pwmval-=10;
RT(pwmval , dir);
}
TIM_ SetCompare1(TIM4, pwmval);
delay_ ms(100);
LED0= LED1= LED2= 0;
}
}
Timer. C code:
#include ""mfuncs.h""
#include ""timer.h""
#include ""led.h""
void TIM4_ PWM_ Init(u32 arr,u32 psc)
{
// In this part, you need to manually modify the IO port settings
GPIO_ InitTypeDef GPIO_ InitStructure;
TIM_ TimeBaseInitTypeDef TIM_ TimeBaseStructure;
TIM_ OCInitTypeDef TIM_ OCInitStructure;
RCC_ APB1PeriphClockCmd(RCC_ APB1Periph_ TIM4, ENABLE); // TIM4 clock enable
RCC_ AHB1PeriphClockCmd(RCC_ AHB1Periph_ GPIOB, ENABLE); // Enable portb clock
GPIO_ PinAFConfig(GPIOB, GPIO_ PinSource6, GPIO_ AF_ TIM4); // Gpiob6, 7 and 8 are multiplexed into timer 4
GPIO_ PinAFConfig(GPIOB, GPIO_ PinSource7, GPIO_ AF_ TIM4); // Gpiob6, 7 and 8 are multiplexed into timer 4
GPIO_ PinAFConfig(GPIOB, GPIO_ PinSource8, GPIO_ AF_ TIM4); // Gpiob6, 7 and 8 are multiplexed into timer 4
GPIO_ InitStructure.GPIO_ Pin = GPIO_ Pin_ 6| GPIO_ Pin_ 7| GPIO_ Pin_ 8; // GPIOB6, 7, 8
GPIO_ InitStructure.GPIO_ Mode = GPIO_ Mode_ AF; // Reuse function
GPIO_ InitStructure.GPIO_ Speed = GPIO_ Speed_ 100MHz; // Speed 100MHz
GPIO_ InitStructure.GPIO_ OType = GPIO_ OType_ PP; // Push pull multiplex output
GPIO_ InitStructure.GPIO_ PuPd = GPIO_ PuPd_ UP; // Pull up
GPIO_ Init(GPIOB, &GPIO_ InitStructure); // Initialize PB
TIM_ TimeBaseStructure.TIM_ Prescaler= psc; // Timer frequency division
TIM_ TimeBaseStructure.TIM_ CounterMode= TIM_ CounterMode_ Up; // Count up mode
TIM_ TimeBaseStructure.TIM_ Period= arr/ 5; // Automatic reload value
TIM_ TimeBaseStructure.TIM_ ClockDivision= TIM_ CKD_ DIV1;
TIM_ TimeBaseInit(TIM4, &TIM_ TimeBaseStructure);// Initialization timer 4
// Initialize TIM4 Channel1 PWM mode
TIM_ OCInitStructure.TIM_ OCMode = TIM_ OCMode_ PWM1; // Select timer mode: Tim pulse width modulation mode 2
TIM_ OCInitStructure.TIM_ OutputState = TIM_ OutputState_ Enable; // Compare output enable
TIM_ OCInitStructure.TIM_ OCPolarity = TIM_ OCPolarity_ Low; // Output polarity: Tim output is relatively low polarity
TIM_ OC1Init(TIM4, &TIM_ OCInitStructure); // Initialize the peripheral tim14 according to the parameters specified by T
TIM_ OC1PreloadConfig(TIM4, TIM_ OCPreload_ Enable); // Enable TIM4 preload register on CCR1
TIM_ TimeBaseStructure.TIM_ Prescaler= psc; // Timer frequency division
TIM_ TimeBaseStructure.TIM_ CounterMode= TIM_ CounterMode_ Up; // Count up mode
TIM_ TimeBaseStructure.TIM_ Period= arr/ 2; // Automatic reload value
TIM_ TimeBaseStructure.TIM_ ClockDivision= TIM_ CKD_ DIV1;
TIM_ TimeBaseInit(TIM4, &TIM_ TimeBaseStructure);// Initialization timer 4
// Initialize TIM4 Channel1 PWM mode
TIM_ OCInitStructure.TIM_ OCMode = TIM_ OCMode_ PWM1; // Select timer mode: Tim pulse width modulation mode 2
TIM_ OCInitStructure.TIM_ OutputState = TIM_ OutputState_ Enable; // Compare output enable
TIM_ OCInitStructure.TIM_ OCPolarity = TIM_ OCPolarity_ Low; // Output polarity: Tim output is relatively low polarity
TIM_ OC1Init(TIM4, &TIM_ OCInitStructure); // Initialize the peripheral TIM1 according to the parameters specified by T
TIM_ OC2PreloadConfig(TIM4, TIM_ OCPreload_ Enable); // Enable TIM4 preload register on CCR1
TIM_ TimeBaseStructure.TIM_ Prescaler= psc; // Timer frequency division
TIM_ TimeBaseStructure.TIM_ CounterMode= TIM_ CounterMode_ Up; // Count up mode
TIM_ TimeBaseStructure.TIM_ Period= arr; // Automatic reload value
TIM_ TimeBaseStructure.TIM_ ClockDivision= TIM_ CKD_ DIV1;
TIM_ TimeBaseInit(TIM4, &TIM_ TimeBaseStructure);// Initialization timer 14
// Initialize TIM4 Channel1 PWM mode
TIM_ OCInitStructure.TIM_ OCMode = TIM_ OCMode_ PWM1; // Select timer mode: Tim pulse width modulation mode 2
TIM_ OCInitStructure.TIM_ OutputState = TIM_ OutputState_ Enable; // Compare output enable
TIM_ OCInitStructure.TIM_ OCPolarity = TIM_ OCPolarity_ Low; // Output polarity: Tim output is relatively low polarity
TIM_ OC1Init(TIM4, &TIM_ OCInitStructure); // Initialize the peripheral TIM1 4oc1 according to the parameters specified by T
TIM_ OC3PreloadConfig(TIM4, TIM_ OCPreload_ Enable); // Enable TIM4 preload register on CCR1
TIM_ ARRPreloadConfig(TIM4, ENABLE); // ARPE enable
TIM_ Cmd(TIM4, ENABLE); // Enable TIM4
}
Timer. H code
#ifndef _ TIMER_ H
#define _ TIMER_ H
#include ""sys.h""
void TIM4_ PWM_ Init(u3
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