金牌会员
 
- 积分
- 2504
- 金钱
- 2504
- 注册时间
- 2015-8-17
- 在线时间
- 383 小时
|
发表于 2016-2-18 13:43:49
|
显示全部楼层
本帖最后由 wszdxmh 于 2016-2-18 13:45 编辑
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //初始化优先级
初始化超声波
[mw_shl_code=c,true]void Ultrasonic_TIM5_Init(uint16_t arr, uint16_t psc)
{
TIM_ICInitTypeDef TIM_ICInitStruct;
GPIO_InitTypeDef GPIO_InitStruct;
NVIC_InitTypeDef NVIC_InitStruct;
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
//ê1Äüê±Öó
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);//ê1ÄüTIM5¶¨ê±Æ÷ê±Öó
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);//ê1ÄüGPIOAê±Öó
//3õê¼»ˉTIM5¶¨ê±Æ÷
TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInitStruct.TIM_Period = arr;
TIM_TimeBaseInitStruct.TIM_Prescaler = psc;
TIM_TimeBaseInit(TIM5, &TIM_TimeBaseInitStruct);
//3õê¼»ˉTIM5êäèë2¶»ñ
TIM_ICInitStruct.TIM_Channel = TIM_Channel_1;//í¨μà1
TIM_ICInitStruct.TIM_ICFilter = 0x00;//2»ÂË2¨
TIM_ICInitStruct.TIM_ICPolarity = TIM_ICPolarity_Rising;//¼«DÔÎaéÏéyÑØ2¶»ñ
TIM_ICInitStruct.TIM_ICPrescaler = TIM_ICPSC_DIV1;//2»·ÖÆμ
TIM_ICInitStruct.TIM_ICSelection = TIM_ICSelection_DirectTI;//ó3éäTI1
TIM_ICInit(TIM5, &TIM_ICInitStruct);
//3õê¼»ˉêäèë2¶»ñòy½Å ECHO
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IPD;
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStruct);
//3õê¼»ˉ3¬éù2¨′￥·￠òy½Å TRIG
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStruct);
GPIO_ResetBits(GPIOA, GPIO_Pin_1);//TRIGà-μí
//3õê¼»ˉÖD¶Ï·Ö×é
NVIC_InitStruct.NVIC_IRQChannel = TIM5_IRQn;
NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
NVIC_Init(&NVIC_InitStruct);
//ê1ÄüTIM5
TIM_ITConfig(TIM5, TIM_IT_Update | TIM_IT_CC1, ENABLE);//ÔêDí¸üDÂÖD¶Ï￡¬ÔêDíCC12¶»ñÖD¶Ï
TIM_Cmd(TIM5, ENABLE);//ê1ÄüTIM5¶¨ê±Æ÷
}[/mw_shl_code]距离计算
[mw_shl_code=c,true]/**
************************************
* @brief 3¬éù2¨¾ààë»ñè¡
* @param arr:5999 psc:72
* @retval None
************************************
*/
uint16_t Ultrasonic_Value(uint16_t arr, uint16_t psc)
{
uint16_t value=0;
GPIO_SetBits(GPIOA, GPIO_Pin_1);//TRIGà-¸ß
delay_us(15);//Ñóê±15us
GPIO_ResetBits(GPIOA, GPIO_Pin_1);//TRIGà-μí
Ultrasonic_TIM5_Init(arr, psc);
while(TIM5CH1_CAPTURE_STA&0x80)//3é1|2¶»ñ
{
TIM5CH1_CAPTURE_STA &= 0x3f;//Çå3y±ê־λ
value = (10.0)*(TIM5CH1_CAPTURE_STA * arr + TIM5CH1_CAPTURE_VAL) / 58; //cm=us/58 mm=cm*10
TIM5CH1_CAPTURE_STA = 0;//¿aÆôÏÂò»′ÎÖD¶Ï
}
return value;
}[/mw_shl_code]
中断捕获
[mw_shl_code=c,true]void TIM5_IRQHandler(void)
{
if((TIM5CH1_CAPTURE_STA & 0x80) == 0)//Î′3é1|2¶»ñìø±äÑØ
{
if(TIM_GetITStatus(TIM5, TIM_IT_Update) == 1)//′￥·￠¸üDÂÖD¶Ï
{
if(TIM5CH1_CAPTURE_STA & 0x40)//òѾ-2¶»ñá˸ßμçƽ
{
if((TIM5CH1_CAPTURE_STA & 0x01) == 0x01)//¸ßμçƽì«3¤
{
TIM5CH1_CAPTURE_STA |= 0x80;
TIM5CH1_CAPTURE_VAL = 0x01;
}
else
{
TIM5CH1_CAPTURE_STA++;
}
}
}
if(TIM_GetITStatus(TIM5, TIM_IT_CC1) == 1)
{
if(TIM5CH1_CAPTURE_STA & 0x40)//òѾ-2¶»ñá˸ßμçƽ
{
TIM5CH1_CAPTURE_STA |= 0x80;
TIM5CH1_CAPTURE_VAL = TIM_GetCapture1(TIM5);
TIM_OC1PolarityConfig(TIM5, TIM_ICPolarity_Rising);//éèÖÃÎaéÏéyÑØ2¶»ñ
}
else
{
TIM5CH1_CAPTURE_STA = 0;
TIM5CH1_CAPTURE_VAL = 0;
TIM5CH1_CAPTURE_STA |= 0x40;
TIM_SetCounter(TIM5, 0);//Çåáã¼ÆêyÆ÷3õÖμ
TIM_OC1PolarityConfig(TIM5, TIM_ICPolarity_Falling);//éèÖÃÎaϽμÑØ2¶»ñ
}
}
}
TIM_ClearITPendingBit(TIM5, TIM_IT_Update | TIM_IT_CC1);
}[/mw_shl_code]
|
|
/2 
|手机版|OpenEdv-开源电子网
( 粤ICP备12000418号-1 )
楼主
