mirror of
https://gitee.com/dlmu-cone/tronone-h7-scaffold
synced 2026-07-24 03:27:45 +08:00
123 lines
3.7 KiB
C
123 lines
3.7 KiB
C
#include "bsp_pwm.h"
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#include "stdlib.h"
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#include "memory.h"
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// 配合中断以及初始化
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static uint8_t idx;
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static PWMInstance *pwm_instance[PWM_DEVICE_CNT] = {NULL}; // 所有的pwm instance保存于此,用于callback时判断中断来源
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static uint32_t PWMSelectTclk(TIM_HandleTypeDef *htim);
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/**
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* @brief pwm dma传输完成回调函数
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*
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* @param htim 发生中断的定时器句柄
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*/
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void HAL_TIM_PWM_PulseFinishedCallback(TIM_HandleTypeDef *htim)
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{
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for (uint8_t i = 0; i < idx; i++)
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{
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// 来自同一个定时器的中断且通道相同
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if (pwm_instance[i]->htim == htim && htim->Channel == (1 << (pwm_instance[i]->channel / 4)))
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{
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if (pwm_instance[i]->callback) // 如果有回调函数
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pwm_instance[i]->callback(pwm_instance[i]);
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return; // 一次只能有一个通道的中断,所以直接返回
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}
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}
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}
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PWMInstance *PWMRegister(PWM_Init_Config_s *config)
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{
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if (idx >= PWM_DEVICE_CNT) // 超过最大实例数,考虑增加或查看是否有内存泄漏
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while (1);
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PWMInstance *pwm = (PWMInstance *) malloc(sizeof(PWMInstance));
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memset(pwm, 0, sizeof(PWMInstance));
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pwm->htim = config->htim;
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pwm->channel = config->channel;
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pwm->period = config->period;
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pwm->dutyratio = config->dutyratio;
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pwm->callback = config->callback;
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pwm->id = config->id;
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pwm->tclk = PWMSelectTclk(pwm->htim);
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// 启动PWM
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HAL_TIM_PWM_Start(pwm->htim, pwm->channel);
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PWMSetPeriod(pwm, pwm->period);
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PWMSetDutyRatio(pwm, pwm->dutyratio);
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pwm_instance[idx++] = pwm;
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return pwm;
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}
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/* 只是对HAL的函数进行了形式上的封装 */
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void PWMStart(PWMInstance *pwm)
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{
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HAL_TIM_PWM_Start(pwm->htim, pwm->channel);
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}
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/* 只是对HAL的函数进行了形式上的封装 */
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void PWMStop(PWMInstance *pwm)
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{
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HAL_TIM_PWM_Stop(pwm->htim, pwm->channel);
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}
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/*
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* @brief 设置pwm周期
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*
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* @param pwm pwm实例
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* @param period 周期 单位 s
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*/
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void PWMSetPeriod(PWMInstance *pwm, float period)
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{
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__HAL_TIM_SetAutoreload(pwm->htim, period * ((pwm->tclk) / (pwm->htim->Init.Prescaler + 1)));
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}
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/*
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* @brief 设置pwm占空比
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*
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* @param pwm pwm实例
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* @param dutyratio 占空比 0~1
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*/
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void PWMSetDutyRatio(PWMInstance *pwm, float dutyratio)
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{
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__HAL_TIM_SetCompare(pwm->htim, pwm->channel, dutyratio * (pwm->htim->Instance->ARR));
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}
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/* 只是对HAL的函数进行了形式上的封装 */
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void PWMStartDMA(PWMInstance *pwm, uint32_t *pData, uint32_t Size)
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{
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HAL_TIM_PWM_Start_DMA(pwm->htim, pwm->channel, pData, Size);
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}
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// STM32H7 PWM时钟源选择函数（简洁版）
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static uint32_t PWMSelectTclk(TIM_HandleTypeDef *htim)
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{
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// 获取APB预分频器值
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uint32_t ppre1 = ((RCC->D2CFGR & RCC_D2CFGR_D2PPRE1) >> RCC_D2CFGR_D2PPRE1_Pos);
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uint32_t ppre2 = ((RCC->D2CFGR & RCC_D2CFGR_D2PPRE2) >> RCC_D2CFGR_D2PPRE2_Pos);
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// 计算倍频因子
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uint32_t tim_mult1 = (ppre1 == 0b000 || ppre1 == 0b100) ? 1 : 2;
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uint32_t tim_mult2 = (ppre2 == 0b000 || ppre2 == 0b100) ? 1 : 2;
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// 根据定时器实例判断
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TIM_TypeDef *tim = htim->Instance;
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if (tim == TIM1 || tim == TIM8 || tim == TIM15 ||
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tim == TIM16 || tim == TIM17) // 某些H7型号有TIM20
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{
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// APB2上的定时器
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return HAL_RCC_GetPCLK2Freq() * tim_mult2;
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}
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else if (tim == TIM2 || tim == TIM3 || tim == TIM4 ||
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tim == TIM5 || tim == TIM12 || tim == TIM13 || tim == TIM14 || tim == TIM6 || tim == TIM7)
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{
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// APB1上的定时器
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return HAL_RCC_GetPCLK1Freq() * tim_mult1;
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}
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else if (tim == TIM23 || tim == TIM24) // 某些H7型号有这些定时器
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{
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}
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return 0; // 未识别的定时器
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}
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