我的板小不能放晶振用的是内部时钟，用示波器看过可以工作的，采用的是硬石的风格。用TIM3,14,15,17都试过都有脉冲输出。
初始化PWM后
HAL_TIM_PWM_Start(&htimx,TIM_CHANNEL_2);
打开PWM，示波器上就有波形输出，不能关！
user_pwm_setvalue(0);用这个关，实际上PWM没关给它低电平。
PWM关就再也打不开了
/**,我只是路过打酱油的，嘿嘿
本帖最后由 konway 于 2017-4-27 08:08 编辑
LIUBEIHUA 发表于 2017-4-26 16:22
初始化PWM后
HAL_TIM_PWM_Start(&htimx,TIM_CHANNEL_2);
打开PWM，示波器上就有波形输出，不能关！
谢谢你的热心回复用这个函数关也是有延迟
HAL_TIM_PWM_Start(&htimx,TIM_CHANNEL_2);
HAL_TIM_PWM_Stop(&htimx,TIM_CHANNEL_2);
user_pwm_setvalue(0);用这个关掉再打开PWM
关是关了，情况没改善，跟我用寄存器的方式是一样的问题
比如我只要关1ms
实际会关5.6ms
另外我也是内部晶振
来学习下
中午吃饭休息时间做的红外发射程序
/**
******************************************************************************
* File Name : main.c
* Description : Main program body
******************************************************************************
*
* COPYRIGHT(c) 2017 STMicroelectronics
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of STMicroelectronics nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "stm32f0xx_hal.h"
uint8_t keyfg;
uint8_t sendfg;
uint8_t button;
uint8_t controlcode;
uint8_t compensate;
uint8_t User_code={0x86, 0x79};
/* Private variables ---------------------------------------------------------*/
TIM_HandleTypeDef htim3;
/* USER CODE BEGIN PV */
/* Private variables ---------------------------------------------------------*/
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
void Error_Handler(void);
static void MX_GPIO_Init(void);
static void MX_TIM3_Init(void);
void HAL_TIM_MspPostInit(TIM_HandleTypeDef *htim);
void user_pwm_setvalue(uint16_t value)
{
TIM_OC_InitTypeDef sConfigOC;
sConfigOC.OCMode = TIM_OCMODE_PWM1;
sConfigOC.Pulse = value;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_2);
HAL_TIM_PWM_Start(&htim3, TIM_CHANNEL_2);
}
void Bit0_Encode_SignalGenerate(void)
{
user_pwm_setvalue(316);
HAL_Delay(56);
user_pwm_setvalue(0);
HAL_Delay(56);
}
void Bit1_Encode_SignalGenerate(void)
{
user_pwm_setvalue(316);
HAL_Delay(56);
user_pwm_setvalue(0);
HAL_Delay(168);
}
void Head_Encode_SignalGenerate(void)
{
user_pwm_setvalue(316);
HAL_Delay(900);
user_pwm_setvalue(0);
HAL_Delay(450);
}
void End_Encode_SignalGenerate(void)
{
user_pwm_setvalue(316);
HAL_Delay(56);
user_pwm_setvalue(0);
HAL_Delay(56);
user_pwm_setvalue(316);
HAL_Delay(56);
user_pwm_setvalue(0);
}
void Encode_SignalGenerate(uint8_t * dat)
{
uint8_t usercode;
uint8_t i, j;
usercode=dat;
usercode=dat;
for(j=0; j<2; j++)
{
for(i=0; i<8; i++)
{
if(usercode&0x80)
Bit1_Encode_SignalGenerate();
else
Bit0_Encode_SignalGenerate();
usercode=usercode<<1;
}
}
}
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration----------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* Configure the system clock */
SystemClock_Config();
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_TIM3_Init();
/* 启动通道PWM输出 */
HAL_TIM_PWM_Start(&htim3,TIM_CHANNEL_2);
user_pwm_setvalue(0);
controlcode=0xd2;
controlcode=0x2d;
while (1)
{
Head_Encode_SignalGenerate();
Encode_SignalGenerate(User_code);
Encode_SignalGenerate(controlcode);
End_Encode_SignalGenerate();
HAL_Delay(4200);
}
}
/** System Clock Configuration
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct;
RCC_ClkInitTypeDef RCC_ClkInitStruct;
/**Initializes the CPU, AHB and APB busses clocks
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL6;
RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV1;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/**Initializes the CPU, AHB and APB busses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
{
Error_Handler();
}
/**Configure the Systick interrupt time
*/
HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/100000);
/**Configure the Systick
*/
HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);
/* SysTick_IRQn interrupt configuration */
HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}
/* TIM3 init function */
static void MX_TIM3_Init(void)
{
TIM_ClockConfigTypeDef sClockSourceConfig;
TIM_MasterConfigTypeDef sMasterConfig;
TIM_OC_InitTypeDef sConfigOC;
htim3.Instance = TIM3;
htim3.Init.Prescaler = 0;
htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
htim3.Init.Period = 1266;
htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if (HAL_TIM_Base_Init(&htim3) != HAL_OK)
{
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig) != HAL_OK)
{
Error_Handler();
}
if (HAL_TIM_PWM_Init(&htim3) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
sConfigOC.OCMode = TIM_OCMODE_PWM1;
sConfigOC.Pulse = 633;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
if (HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_2) != HAL_OK)
{
Error_Handler();
}
HAL_TIM_MspPostInit(&htim3);
}
/** Configure pins as
* Analog
* Input
* Output
* EVENT_OUT
* EXTI
*/
static void MX_GPIO_Init(void)
{
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOF_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
}
/* USER CODE BEGIN 4 */
/* USER CODE END 4 */
/**
* @briefThis function is executed in case of error occurrence.
* @paramNone
* @retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler */
/* User can add his own implementation to report the HAL error return state */
while(1)
{
}
/* USER CODE END Error_Handler */
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t* file, uint32_t line)
{
/* USER CODE BEGIN 6 */
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* USER CODE END 6 */
}
#endif
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
/**Configure the Systick interrupt time
*/
HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/100000); //此处100000 这样HAL_Delay()变成10us
/**Configure the Systick
HAL_Delay(56);就是560us
完整的程序
LIUBEIHUA 发表于 2017-4-27 13:02
完整的程序
非常感谢您的热心回复。
今天下午改用GPIO脚加三极管来开关红外发射，PWM则一直输出38K方波
发现个奇葩的现象：
用GPIO控制一样有延迟问题，而且延迟的时间也是一样。
看来这不是PWM的问题
我把while大循环的所有程序屏蔽掉，只留红外发射，就没有延迟
如果加上
HAL_Delay(10);//10ms
也没延迟，改到15ms以上就有有延迟了。。。
这个问题搞了几天，我快抓狂了。。。
我看了一下我的中断，中断里面没加什么耗时的程序，都是只有一点点简单的减法。为了省时间我连回调函数都关掉了........
最后，发现是发送红外信号时，板子上的红外接收头收到了刚发送的信号，（板子有发送也有接收）进入了接收中断。然后就不用说了。。。。。
非常感谢您的热心回复。