TIMER
TIMx TypeDef
#include stm32f11xe.h
``
/*!< APB2 peripherals */
#define TIM1_BASE (APB2PERIPH_BASE + 0x0000UL)
#define TIM1 ((TIM_TypeDef *) TIM1_BASE)
/*!< APB1 peripherals */
#define TIM2_BASE (APB1PERIPH_BASE + 0x0000UL)
#define TIM2 ((TIM_TypeDef *) TIM2_BASE)
typedef struct
{
__IO uint32_t CR1; /*!< TIM control register 1, Address offset: 0x00 */
__IO uint32_t CR2; /*!< TIM control register 2, Address offset: 0x04 */
__IO uint32_t SMCR; /*!< TIM slave mode control register, Address offset: 0x08 */
__IO uint32_t DIER; /*!< TIM DMA/interrupt enable register, Address offset: 0x0C */
__IO uint32_t SR; /*!< TIM status register, Address offset: 0x10 */
__IO uint32_t EGR; /*!< TIM event generation register, Address offset: 0x14 */
__IO uint32_t CCMR1; /*!< TIM capture/compare mode register 1, Address offset: 0x18 */
__IO uint32_t CCMR2; /*!< TIM capture/compare mode register 2, Address offset: 0x1C */
__IO uint32_t CCER; /*!< TIM capture/compare enable register, Address offset: 0x20 */
__IO uint32_t CNT; /*!< TIM counter register, Address offset: 0x24 */
__IO uint32_t PSC; /*!< TIM prescaler, Address offset: 0x28 */
__IO uint32_t ARR; /*!< TIM auto-reload register, Address offset: 0x2C */
__IO uint32_t RCR; /*!< TIM repetition counter register, Address offset: 0x30 */
__IO uint32_t CCR1; /*!< TIM capture/compare register 1, Address offset: 0x34 */
__IO uint32_t CCR2; /*!< TIM capture/compare register 2, Address offset: 0x38 */
__IO uint32_t CCR3; /*!< TIM capture/compare register 3, Address offset: 0x3C */
__IO uint32_t CCR4; /*!< TIM capture/compare register 4, Address offset: 0x40 */
__IO uint32_t BDTR; /*!< TIM break and dead-time register, Address offset: 0x44 */
__IO uint32_t DCR; /*!< TIM DMA control register, Address offset: 0x48 */
__IO uint32_t DMAR; /*!< TIM DMA address for full transfer, Address offset: 0x4C */
__IO uint32_t OR; /*!< TIM option register, Address offset: 0x50 */
} TIM_TypeDef;Example Code for Tutorial
Tutorial: TIMER Initiation
// Some code
/**
******************************************************************************
* @author SSSLAB
* @Mod 2021-8-12 by YKKIM
* @brief Embedded Controller: Tutorial ___
* - _________________________________
*
******************************************************************************
*/
#include "stm32f411xe.h"
#include "ecGPIO.h"
#include "ecRCC.h"
//#include "ecTIM.h"
uint32_t _count=0;
#define LED_PIN 5
void setup(void);
int main(void) {
// Initialiization --------------------------------------------------------
setup();
TIM_TypeDef* timerx;
timerx = TIM2;
RCC->APB1ENR |= RCC_APB1ENR_TIM2EN;
timerx->PSC = 83; // Timer counter clock: 1MHz(1us)
timerx->ARR = 999; // Set auto reload register to maximum (count up to 65535)
timerx->DIER |= TIM_DIER_UIE;
timerx->CR1 |= TIM_CR1_CEN;
NVIC_EnableIRQ(TIM2_IRQn);
NVIC_SetPriority(TIM2_IRQn ,2);
// Inifinite Loop ----------------------------------------------------------
while(1){}
}
// Initialiization
void setup(void)
{
RCC_PLL_init(); // System Clock = 84MHz
GPIO_init(GPIOA, LED_PIN, OUTPUT); // calls RCC_GPIOA_enable()
}
void TIM2_IRQHandler(void){
if((TIM2->SR & TIM_SR_UIF) == TIM_SR_UIF){// update interrupt flag
_count++;
if (_count >1000) {
LED_toggle();
_count=0;}
TIM2->SR &= ~TIM_SR_UIF;// clear by writing 0
}
}EC_TIM.h example
TIMER Initialization and Timer Update Event Interrupt
/* Timer Counter Configuration */
//// Step 1: Initialize Timer
//TIM_init(TIMx); // default: TIM_period_ms(TIM2, 1 msec) with Counter_Clk 100kHz / PSC=840-1, ARR=100-1
//// Step 2: Choose Timer Update Period (a) msec or (b) usec
//TIM_period_ms(TIMx, msec); // Timer-Update-Period: msec< 600 with 100 kHz Counter / PSC=840 / ARR = 100 * msec
//TIM_period_us(TIMx, usec); // Timer-Update-Period: usec< 6000 with 1 MHz Counter / PSC=84 / ARR = 1 * usec
///// Example Code 1:
// Configure TIM2 with 10 usec.
// Configure TIM3 with 100 msec.
void setup(){
TIM_init(TIM2);
TIM_period_us(TIM2, 10);
TIM_init(TIM3);
TIM_period_ms(TIM3, 100);
}
/* Timer UI Interrupt Configuration */
/////// Step1: Initialize TIM_UI with TIMERx
// void TIM_UI_init(TIM_TypeDef* TIMx, uint32_t msec);
/////// Step2: Start by Enabling TIM_UI
// void TIM_UI_enable(TIM_TypeDef* TIMx);
// void TIM_UI_disable(TIM_TypeDef* TIMx);
///// Example Code 2:
// Configure TIM2 Update-Interrupt with 10 msec. Note: it uses CounterCLK=100kHz
void setup(){
TIM_UI_init(TIM2,10);
TIM_UI_enable(TIM2);
}
Tutorial: PWM Configuration
/**
******************************************************************************
* @author SSSLAB
* @Mod 2021-8-12 by YKKIM
* @brief Embedded Controller: Tutorial ___
* - _________________________________
*
******************************************************************************
*/
#include "stm32f411xe.h"
#include "ecGPIO.h"
#include "ecRCC.h"
#include "ecPWM.h"
#include "ecSysTick.h"
#include "ecEXTI.h"
uint32_t _count=0;
#define LED_PIN 5
#define BUTTON_PIN 13
void setup(void);
int main(void) {
// Initialiization --------------------------------------------------------
RCC_PLL_init(); // System Clock = 84MHz
SysTick_init(); // for delay_ms()
GPIO_init(GPIOA, LED_PIN, EC_ALTE); // GPIOA 5 ALTERNATE function
GPIO_ospeed(GPIOA, LED_PIN, EC_HIGH); // GPIOA 5 HIGH SPEED
// TEMP: TIMER Register Initialiization --------------------------------------------------------
TIM_TypeDef *TIMx;
TIMx = TIM2;
// GPIO: ALTERNATIVE function setting
GPIOA->AFR[0] = 1<<(4*LED_PIN); // AF1 at PA5 = TIM2_CH1 (p.150)
// TIMER: PWM setting
RCC->APB1ENR |= RCC_APB1ENR_TIM2EN; // Enable TIMER clock
TIMx->CR1 &= ~TIM_CR1_DIR; // Direction Up-count
uint32_t prescaler = 839;
TIMx->PSC = prescaler; // Set Timer CLK: (PSC+1)= 84Mhz/0.1MHz --> PSC= 840-1
TIMx->ARR = 99; // Set ARR: (ARR+1) = 100kHz/1kHz --> ARR=100-1.
TIMx->CCMR1 &= ~TIM_CCMR1_OC1M; // Clear ouput compare mode bits for channel 1
TIMx->CCMR1 |= TIM_CCMR1_OC1M_1 | TIM_CCMR1_OC1M_2; // OC1M = 110 for PWM Mode 1 output on ch1. #define TIM_CCMR1_OC1M_1 (0x2UL << TIM_CCMR1_OC1M_Pos)
TIMx->CCMR1 |= TIM_CCMR1_OC1PE; // Output 1 preload enable (make CCR1 value changable)
TIMx->CCER &= ~TIM_CCER_CC1P; // select output polarity: active high
TIMx->CCER |= TIM_CCER_CC1E; // Enable output for ch1
TIMx->CCR1 = 99/2; // Output Compare Register for channel 1 (default duty ratio = 50%)
TIMx->CR1 |= TIM_CR1_CEN; // Enable counter
// Inifinite Loop ----------------------------------------------------------
while(1){
for (int i=0;i<3;i++){
TIM2->CCR1 = 99*i/2;
delay_ms(100);
}
}
}EC_PWM.h example
Configuring PWM output pins
///// Example Code 1: Configure PWM outputs
void setup() {
// Configure TIM2_CH1 as PWM of msec period
PWM_init(PA_5); // TIM2_CH1 PWM
PWM_period_ms(PA_5, msec); // PWM period: 0.01 msec ~ 655 msec
PWM_pulsewidth_ms(PA_5, pulse_width_ms); // PWM pulsewidth: 0.01 msec ~ 655 msec
// Configure TIM3_CH1 as PWM of usec period
PWM_init(PA_6); // TIM3_CH1 PWM
PWM_period_us(PA_6, usec); // PWM period: 1 usec ~65,536 usec
PWM_pulsewidth_us(PA_6, pulse_width_us); // PWM pulsewidth: 1 usec ~65,536 usec
}
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