Keil MDK STM32系列
Keil MDK STM32系列(一) 基于标准外设库SPL的STM32F103开发
Keil MDK STM32系列(二) 基于标准外设库SPL的STM32F401开发
Keil MDK STM32系列(三) 基于标准外设库SPL的STM32F407开发
Keil MDK STM32系列(四) 基于抽象外设库HAL的STM32F401开发
Keil MDK STM32系列(五) 使用STM32CubeMX创建项目基础结构
Keil MDK STM32系列(六) 基于HAL的ADC模数转换
Keil MDK STM32系列(七) STM32F4基于HAL的PWM和定时器
Keil MDK STM32系列(八) STM32F4基于HAL的PWM和定时器输出音频
Keil MDK STM32系列(九) 基于HAL和FatFs的FAT格式SD卡TF卡读写
配置 PWM 输出
选择芯片
System Core -> SYS-> Debug: Serial Wire 防止下次无法烧录
System Core -> RCC-> High Speed Clock (HSE): Crystal/Ceramic Resonator 启用外接高速晶振
Clock Configuration: (配置为最高84MHz)选择外部晶振, 把HSE和PLLCLK连上, 在HCLK上输入84回车, 软件会自动调节各节点倍数
Timers -> TIM2
Clock Source: Internel Clock, 使用系统的时钟源
Channelx: PWM Generation CHx PWM输出
Counter Settings PWM频率 = 84MHz / (Perscaler + 1) / (Counter Period + 1)
Perscaler: 0
Counter Mode: Up
Counter Period: 256
Internal Clock Division(CKD): No Division
auto-reload preload: Enable - 如果启用, 在修改占空比时会等当前周期执行完再变化
Trigger Output
Master/Slave Mode (MSM bit): Disable
Trigger Event Selection: Reset (UG bit from TIMx_EGR)
PWM Generation Channel 1
Mode: PWM mode1
Pulse: 0
Output compare perload: Enable
Fast Mode: Disable
CH Polarity: High
PWM Generation Channel 2
...
PWM 配置, 体现在代码上的变化
- stm32f4xx_hal_conf.h 去掉了TIM的注释
#define HAL_TIM_MODULE_ENABLED
- stm32f4xx_hal_msp.c 增加了初始化方法HAL_TIM_Base_MspInit(), HAL_TIM_MspPostInit(), HAL_TIM_Base_MspDeInit()
void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* htim_base)
{
if(htim_base->Instance==TIM2)
{
/* USER CODE BEGIN TIM2_MspInit 0 */
/* USER CODE END TIM2_MspInit 0 */
/* Peripheral clock enable */
__HAL_RCC_TIM2_CLK_ENABLE();
/* USER CODE BEGIN TIM2_MspInit 1 */
/* USER CODE END TIM2_MspInit 1 */
}
}
void HAL_TIM_MspPostInit(TIM_HandleTypeDef* htim)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
if(htim->Instance==TIM2)
{
/* USER CODE BEGIN TIM2_MspPostInit 0 */
/* USER CODE END TIM2_MspPostInit 0 */
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
/**TIM2 GPIO Configuration
PA15 ------> TIM2_CH1
PB3 ------> TIM2_CH2
*/
GPIO_InitStruct.Pin = GPIO_PIN_15;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Alternate = GPIO_AF1_TIM2;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
GPIO_InitStruct.Pin = GPIO_PIN_3;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Alternate = GPIO_AF1_TIM2;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
/* USER CODE BEGIN TIM2_MspPostInit 1 */
/* USER CODE END TIM2_MspPostInit 1 */
}
}
/**
* @brief TIM_Base MSP De-Initialization
* This function freeze the hardware resources used in this example
* @param htim_base: TIM_Base handle pointer
* @retval None
*/
void HAL_TIM_Base_MspDeInit(TIM_HandleTypeDef* htim_base)
{
if(htim_base->Instance==TIM2)
{
/* USER CODE BEGIN TIM2_MspDeInit 0 */
/* USER CODE END TIM2_MspDeInit 0 */
/* Peripheral clock disable */
__HAL_RCC_TIM2_CLK_DISABLE();
/* USER CODE BEGIN TIM2_MspDeInit 1 */
/* USER CODE END TIM2_MspDeInit 1 */
}
}
- main.c 对TIM2增加初始化方法, TIM的初始化过程与其它外设是不一样的
这里Prescaler=0, Period=255, 对应84MHz的SYSCLK, 输出的PWM频率为84MHz/256 = 32.8125KHz, 用于输出音频
TIM_HandleTypeDef htim2;
/**
* @brief TIM2 Initialization Function
* @param None
* @retval None
*/
static void MX_TIM2_Init(void)
{
TIM_ClockConfigTypeDef sClockSourceConfig = {0};
TIM_MasterConfigTypeDef sMasterConfig = {0};
TIM_OC_InitTypeDef sConfigOC = {0};
htim2.Instance = TIM2;
htim2.Init.Prescaler = 0;
htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
htim2.Init.Period = 255;
htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if (HAL_TIM_Base_Init(&htim2) != HAL_OK)
{
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK)
{
Error_Handler();
}
if (HAL_TIM_PWM_Init(&htim2) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
sConfigOC.OCMode = TIM_OCMODE_PWM1;
sConfigOC.Pulse = 0;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
if (HAL_TIM_PWM_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
{
Error_Handler();
}
if (HAL_TIM_PWM_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_2) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN TIM2_Init 2 */
/* USER CODE END TIM2_Init 2 */
HAL_TIM_MspPostInit(&htim2);
}
配置定时器
通过TIMx配置
勾选 Internal Clock
配置下方参数
Counter Settings
Prescaler: 0
Counter Mode: Up
Counter Period: 1999 这里和Perscaler组合, 实现(0+1)(1999+1)个时钟的周期
Internal Clock Division (CKD): No division
auto-reload preload: Disable
Trigger Output (TRGO) Parameters
Master/Slave Mode (MSM bit): Disable
Trigger Envent Selection: Reset
NVIC Settings
TIM3 global interrupt: Enable
对应代码变化
stm32f4xx_hal_conf.h 启用TIM模块
#define HAL_TIM_MODULE_ENABLED
main.c 除了初始化方法, 还需要添加中断处理方法
static void MX_TIM3_Init(void)
{
TIM_ClockConfigTypeDef sClockSourceConfig = {0};
TIM_MasterConfigTypeDef sMasterConfig = {0};
htim3.Instance = TIM3;
htim3.Init.Prescaler = 0;
htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
htim3.Init.Period = 1999;
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();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
}
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
//...
}
stm32f4xx_hal_msp.c 这里会一起处理其他的TIM实例
void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* htim_base)
{
if(htim_base->Instance==TIM2)
{
// ...
}
else if(htim_base->Instance==TIM3)
{
__HAL_RCC_TIM3_CLK_ENABLE();
HAL_NVIC_SetPriority(TIM3_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(TIM3_IRQn);
}
}
void HAL_TIM_Base_MspDeInit(TIM_HandleTypeDef* htim_base)
{
if(htim_base->Instance==TIM2)
{
//...
}
else if(htim_base->Instance==TIM3)
{
__HAL_RCC_TIM3_CLK_DISABLE();
HAL_NVIC_DisableIRQ(TIM3_IRQn);
}
}
stm32f4xx_it.h 增加对应的定时中断处理
void TIM3_IRQHandler(void);
stm32f4xx_it.c
/**
* @brief This function handles TIM3 global interrupt.
*/
void TIM3_IRQHandler(void)
{
HAL_TIM_IRQHandler(&htim3);
}
