109 lines
3.4 KiB
C
109 lines
3.4 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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{ // 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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;
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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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// 设置pwm对应定时器时钟源频率
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//tim2~7,12~14:APB1 tim1,8~11:APB2
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static uint32_t PWMSelectTclk(TIM_HandleTypeDef *htim )
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{
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uintptr_t tclk_temp = ((uintptr_t)((htim)->Instance));
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if (
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(tclk_temp <= (APB1PERIPH_BASE + 0x2000UL)) &&
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(tclk_temp >= (APB1PERIPH_BASE + 0x0000UL)))
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{
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return (HAL_RCC_GetPCLK1Freq() * (APBPrescTable[(RCC->CFGR & RCC_CFGR_PPRE1)>> RCC_CFGR_PPRE1_Pos] == 0 ? 1 : 2));
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}
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else if (
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((tclk_temp <= (APB2PERIPH_BASE + 0x0400UL)) &&
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(tclk_temp >= (APB2PERIPH_BASE + 0x0000UL))) ||
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((tclk_temp <= (APB2PERIPH_BASE + 0x4800UL)) &&
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(tclk_temp >= (APB2PERIPH_BASE + 0x4000UL))))
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{
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return (HAL_RCC_GetPCLK2Freq() * (APBPrescTable[(RCC->CFGR & RCC_CFGR_PPRE1)>> RCC_CFGR_PPRE1_Pos] == 0 ? 1 : 2));
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}
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return 0;
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} |