高階定時器—PWM互補輸出
阿新 • • 發佈：2019-02-14
一、程式設計要點
1、初始化TMI相關GPIO
2、初始化時基結構體
3、初始化比較輸出結構體
4、初始化死區剎車結構體
5、編寫呼吸燈函式
二、結構體&庫函式
1、時基結構體
typedef struct { uint16_t TIM_Prescaler; /*!< 預分頻器 配置TIMxPSC 暫存器 */ uint16_t TIM_CounterMode; /*!< 計數器模式 向上/向下 */ uint16_t TIM_Period; /*!< 定時週期 配置 ARR (自動重灌載暫存器) */ uint16_t TIM_ClockDivision; /*!< 時鐘分頻，設定定時器時鐘 CK_INT 頻率與數字濾波器取樣時鐘 頻率分頻比， */ //uint8_t TIM_RepetitionCounter; /*!< 重複計數器 高階定時器專屬 用於產生多少個PWM波 */ } TIM_TimeBaseInitTypeDef;
2、比較輸出結構體
typedef struct { uint16_t TIM_OCMode; /*!< 比較輸出模式 常用PWM1 PWM2 */ uint16_t TIM_OutputState; /*!< 比較輸出使能 */ uint16_t TIM_OutputNState; /*!< 互補比較輸出使能 */ uint16_t TIM_Pulse; /*!< 設定佔空比 CRR的值 0-65535 */ uint16_t TIM_OCPolarity; /*!< 比較輸出極性 */ uint16_t TIM_OCNPolarity; /*!< 互補比較輸出極性*/ uint16_t TIM_OCIdleState; /*!< 空閒狀態輸出狀態（高、低電平） */ uint16_t TIM_OCNIdleState; /*!< 互補空閒狀態輸出狀態（高、低電平）*/ } TIM_OCInitTypeDef;
3、初始化死區剎車結構體
typedef struct { uint16_t TIM_OSSRState; /*!< 執行模式下的關閉狀態選擇 */ uint16_t TIM_OSSIState; /*!< 空閒模式下的關閉狀態選擇 */ uint16_t TIM_LOCKLevel; /*!< 鎖定級別配置 */ uint16_t TIM_DeadTime; /*!< 死區時間 0-255 */ uint16_t TIM_Break; /*!< 斷路功能選擇 */ uint16_t TIM_BreakPolarity; /*!< 斷路輸出極性 */ uint16_t TIM_AutomaticOutput; /*!< 自動輸出使能 */ } TIM_BDTRInitTypeDef;
三、TIM相關計算
1、PWM波頻率計算
F = TIM_CLK/{(ARR+1)*(PSC+1)}
TIM_CLK=72M
ARR(自動重灌載的值)-> TIM_Period
PCS(時鐘預分頻器) -> TIM_Prescaler
佔空比=TIM_Pulse/TIM_Period四、程式原始碼
1、Advanced_TIM.h 檔案
#ifndef __ADVABCED_H
#define __ADVABCED_H
#include "stm32f10x.h"
#define RCC_APBx_CLOCK RCC_APB2PeriphClockCmd
#define RCC_APBx_PERIPH RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB
#define RCC_APB2_TIMxRCC_APB2Periph_TIM1
#define ADVANCED_TIMxTIM1
#define TIMx_PSC (9-1)
#define TIMx_ARR (80-1)
#define TIMx_Pulse 0
#define TIM_CH1_PIN GPIO_Pin_8
#define TIM_CH1_PORT GPIOA
#define TIM_CH1N_PIN GPIO_Pin_13
#define TIM_CH1N_PORT GPIOB
#define TIM_BKIN_PIN GPIO_Pin_12
#define TIM_BKINN_PORT GPIOB
void TIM_ADVANCED_Init(void);
#endif//__ADVABCED_H
#include "Advanced_TIM.h"
static void ADVANCED_TIM_GPIOConfig(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APBx_CLOCK(RCC_APBx_PERIPH,ENABLE);
//輸出比較通道
GPIO_InitStructure.GPIO_Pin = TIM_CH1_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(TIM_CH1_PORT,&GPIO_InitStructure);
//輸出比較互補通道
GPIO_InitStructure.GPIO_Pin = TIM_CH1N_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(TIM_CH1N_PORT,&GPIO_InitStructure);
//輸出剎車通道
GPIO_InitStructure.GPIO_Pin = TIM_BKIN_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(TIM_BKINN_PORT,&GPIO_InitStructure);
}
static void ADVANCED_TIM_MODE_Config(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; //時基結構
TIM_OCInitTypeDef TIM_OCStructure; //輸出比較
TIM_BDTRInitTypeDef TIM_BDTRStructure; //剎車 死區
RCC_APBx_CLOCK(RCC_APB2_TIMx,ENABLE);
//時基配置
TIM_TimeBaseStructure.TIM_Prescaler = TIMx_PSC;
TIM_TimeBaseStructure.TIM_Period = TIMx_ARR;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit( ADVANCED_TIMx,&TIM_TimeBaseStructure );
//比較輸出
TIM_OCStructure.TIM_OCMode = TIM_OCMode_PWM1; //pwm1模式
TIM_OCStructure.TIM_OutputState = TIM_OutputState_Enable; //輸出使能
TIM_OCStructure.TIM_OutputNState = TIM_OutputNState_Enable; //互補輸出使能
TIM_OCStructure.TIM_Pulse = TIMx_Pulse; //佔空比
TIM_OCStructure.TIM_OCPolarity = TIM_OCPolarity_High; //比較輸出極性
TIM_OCStructure.TIM_OCNPolarity = TIM_OCNPolarity_High; //互補比較輸出極性
TIM_OCStructure.TIM_OCIdleState = TIM_OCIdleState_Set; //空閒輸出電平
TIM_OCStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset; //空閒互補輸出電平
TIM_OC1Init(ADVANCED_TIMx , &TIM_OCStructure );
TIM_OC1PreloadConfig(ADVANCED_TIMx, TIM_OCPreload_Enable);
//剎車死區
TIM_BDTRStructure.TIM_OSSIState = TIM_OSSIState_Enable;
TIM_BDTRStructure.TIM_OSSRState = TIM_OSSRState_Enable;
TIM_BDTRStructure.TIM_Break = TIM_Break_Enable;
TIM_BDTRStructure.TIM_LOCKLevel = TIM_LOCKLevel_1;
TIM_BDTRStructure.TIM_DeadTime = 11 ;
TIM_BDTRStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
TIM_BDTRStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
TIM_BDTRConfig( ADVANCED_TIMx , &TIM_BDTRStructure );
TIM_Cmd(ADVANCED_TIMx, ENABLE );
TIM_CtrlPWMOutputs( ADVANCED_TIMx, ENABLE );
}
void TIM_ADVANCED_Init(void)
{
ADVANCED_TIM_GPIOConfig();
ADVANCED_TIM_MODE_Config();
}
#include "stm32f10x.h"
#include "bsp_led.h"
#include "usart.h"
#include "Advanced_TIM.h"
int main(void)
{
uint32_t i;
u8 STD=0,crr=0;
USART_config();
printf("串列埠測試\n");
TIM_ADVANCED_Init();
TIM1->CCR1 = crr;
while(1)
{
TIM1->CCR1 = crr;
if(STD==0)
{
for(i=0x8ffff;i>0;i--);
crr++;
if(crr>=80)STD=1;
}
else
{
for(i=0x8ffff;i>0;i--);
crr--;
if(crr<=0)STD=0;
}
}
}