用标准库函数编写stm32定时器1触发ADC转换
时间: 2024-05-16 11:16:30 浏览: 100
在STM32中,可以通过定时器触发ADC转换。在这里,我们使用标准库函数来实现这个功能。
首先,需要初始化定时器和ADC。我们假设使用的是TIM1和ADC1,且采用单通道模式。代码如下:
```
TIM_TimeBaseInitTypeDef TIM_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
// 初始化定时器
TIM_StructInit(&TIM_InitStructure);
TIM_InitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_InitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_InitStructure.TIM_Period = 5000;
TIM_InitStructure.TIM_Prescaler = 71;
TIM_TimeBaseInit(TIM1, &TIM_InitStructure);
// 初始化ADC
ADC_StructInit(&ADC_InitStructure);
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_NbrOfChannel = 1;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ScanConvMode = ADC_Channel_0;
ADC_Init(ADC1, &ADC_InitStructure);
// 启动定时器
TIM_Cmd(TIM1, ENABLE);
```
在这里,我们设置了定时器的时钟分频为1,计数模式为向上计数,周期为5000,预分频器为71。ADC的连续转换模式关闭,数据对齐方式为右对齐,外部触发转换源为TIM1的CC1通道,模式为独立模式,转换通道数为1,扫描模式关闭,转换通道为ADC_Channel_0。
接下来,我们需要设置定时器的CC1通道作为ADC的外部触发源。代码如下:
```
TIM_OCInitTypeDef TIM_OCInitStructure;
// 初始化定时器的CC1通道
TIM_OCStructInit(&TIM_OCInitStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Disable;
TIM_OCInitStructure.TIM_Pulse = 0;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
```
在这里,我们设置了定时器的CC1通道的模式为计时模式,输出状态为禁用,脉冲为0。
最后,我们需要配置ADC的转换通道和采样时间,并启动转换。代码如下:
```
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_55Cycles5);
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
```
在这里,我们设置了ADC的转换通道为ADC_Channel_0,采样时间为55.5个时钟周期,并启动转换。
完整的代码如下:
```
TIM_TimeBaseInitTypeDef TIM_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
// 初始化定时器
TIM_StructInit(&TIM_InitStructure);
TIM_InitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_InitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_InitStructure.TIM_Period = 5000;
TIM_InitStructure.TIM_Prescaler = 71;
TIM_TimeBaseInit(TIM1, &TIM_InitStructure);
// 初始化定时器的CC1通道
TIM_OCStructInit(&TIM_OCInitStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Disable;
TIM_OCInitStructure.TIM_Pulse = 0;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
// 初始化ADC
ADC_StructInit(&ADC_InitStructure);
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_NbrOfChannel = 1;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ScanConvMode = ADC_Channel_0;
ADC_Init(ADC1, &ADC_InitStructure);
// 配置ADC的转换通道和采样时间,并启动转换
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_55Cycles5);
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
// 启动定时器
TIM_Cmd(TIM1, ENABLE);
```
这样,我们就使用标准库函数编写了STM32定时器1触发ADC转换的代码。
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