105 lines
3.1 KiB
C
105 lines
3.1 KiB
C
/**
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******************************************************************
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* @file bsp_key.c
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* @author fire
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* @version V1.0
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* @date 2015-xx-xx
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* @brief LPTIM-低功耗定时器PWM输出初始化配置
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******************************************************************
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* @attention
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*
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* 实验平台:野火 STM32H750 开发板
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* 论坛 :http://www.firebbs.cn
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* 淘宝 :http://firestm32.taobao.com
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*
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******************************************************************
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*/
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#include "./lptim/bsp_lptim.h"
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LPTIM_HandleTypeDef LPTIM_Handle;
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/**
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* @brief LPTIM的引脚初始化
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* @param 无
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* @retval 无
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*/
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void LPTIM_GPIO_Config(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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/*开启LPTIM1引脚的时钟*/
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LPTIMx_OUT_GPIO_CLK_ENABLE();
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/*选择按键的引脚*/
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GPIO_InitStructure.Pin = LPTIMx_OUT_PIN;
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/*设置引脚为复用推捖模式*/
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GPIO_InitStructure.Mode = GPIO_MODE_AF_PP;
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/*设置引脚不上拉也不下拉*/
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GPIO_InitStructure.Pull = GPIO_PULLUP;
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GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_HIGH;
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GPIO_InitStructure.Alternate = LPTIMx_OUT_AF;
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/*使用上面的结构体初始化按键*/
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HAL_GPIO_Init(LPTIMx_OUT_GPIO_PORT, &GPIO_InitStructure);
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}
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/**
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* @brief 配置TIM输出PWM
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* @param 无
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* @retval 无
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*/
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void LPTIM_MODE_Config(void)
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{
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RCC_PeriphCLKInitTypeDef RCC_PeriphCLKInitStruct;
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uint32_t PeriodValue;
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uint32_t PulseValue;
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RCC_PeriphCLKInitStruct.PeriphClockSelection = RCC_PERIPHCLK_LPTIM1;
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/* 选择LSI时钟作为LPTIM时钟源 */
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#if (LPTIMx_CLK_Source == LSI)
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RCC_PeriphCLKInitStruct.Lptim1ClockSelection = RCC_LPTIM1CLKSOURCE_LSI;
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/* 选择LSE时钟作为LPTIM时钟源 */
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#elif (LPTIMx_CLK_Source == LSE)
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RCC_PeriphCLKInitStruct.Lptim1ClockSelection = RCC_LPTIM1CLKSOURCE_LSE;
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#endif
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HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphCLKInitStruct);
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/*开启LPTIM1的时钟*/
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LPTIMx_CLK_ENABLE();
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/* 定义定时器的句柄即确定定时器寄存器的基地址*/
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LPTIM_Handle.Instance = LPTIMx_Instance;
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//选择内部时钟源LPTIM_CLK = LSE=32.768KHz
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LPTIM_Handle.Init.Clock.Source = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
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// 定时器时钟分频系数
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LPTIM_Handle.Init.Clock.Prescaler = LPTIM_PRESCALER_DIV1;
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// 定时器计数源，内部
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LPTIM_Handle.Init.CounterSource = LPTIM_COUNTERSOURCE_INTERNAL;
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// 触发源，软件触发
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LPTIM_Handle.Init.Trigger.Source = LPTIM_TRIGSOURCE_SOFTWARE;
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// 定时器输出极性
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LPTIM_Handle.Init.OutputPolarity = LPTIM_OUTPUTPOLARITY_HIGH;
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// 定时器更新方式
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LPTIM_Handle.Init.UpdateMode = LPTIM_UPDATE_IMMEDIATE;
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HAL_LPTIM_Init(&LPTIM_Handle);
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/*PWM模式配置*/
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/*当定时器从0计数到99，即为100次，
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为一个定时周期PWM周期，32.768KHz/100=327.68Hz*/
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PeriodValue = 100-1;
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/*PWM脉冲为周期一半即50% */
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PulseValue = 50-1;
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HAL_LPTIM_PWM_Start(&LPTIM_Handle, PeriodValue, PulseValue);
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}
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/**
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* @brief 低功耗定时器在低功耗模式输出PWM
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* @param 无
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* @retval 无
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*/
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void LPTIM_PWM_OUT(void)
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{
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LPTIM_GPIO_Config();
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LPTIM_MODE_Config();
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/* 进入低功耗模式 */
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HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
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/* 等待系统被按键KEY2唤醒，退出低功耗模式后停止输出PWM */
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HAL_LPTIM_PWM_Stop(&LPTIM_Handle);
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}
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/*********************************************END OF FILE**********************/
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