基于NUCLEO-U575ZI-Q开发板使用ADC实时获取NTC的摄氏度温度
时间: 2023-12-26 13:04:07 浏览: 77
好的,我可以为你提供一些代码示例和步骤:
1. 初始化ADC模块和GPIO模块,将NTC连接到ADC输入端口,如PA0。
```c
ADC_HandleTypeDef hadc1;
void MX_ADC1_Init(void)
{
ADC_ChannelConfTypeDef sConfig = {0};
hadc1.Instance = ADC1;
hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
hadc1.Init.Resolution = ADC_RESOLUTION_12B;
hadc1.Init.ScanConvMode = DISABLE;
hadc1.Init.ContinuousConvMode = ENABLE;
hadc1.Init.DiscontinuousConvMode = DISABLE;
hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc1.Init.NbrOfConversion = 1;
hadc1.Init.DMAContinuousRequests = DISABLE;
hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
if (HAL_ADC_Init(&hadc1) != HAL_OK)
{
Error_Handler();
}
sConfig.Channel = ADC_CHANNEL_0;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLETIME_640CYCLES_5;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
{
Error_Handler();
}
}
void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
__HAL_RCC_GPIOA_CLK_ENABLE();
GPIO_InitStruct.Pin = GPIO_PIN_0;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG_ADC_CONTROL;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}
```
2. 读取ADC值并转换为温度值,假设NTC为10K欧姆,采用标准B值3950:
```c
float ntc_convert_to_temp(uint16_t adc_value)
{
float r_ntc = 10000.0f * ((float)adc_value / 4095.0f);
float temp = (1.0f / ((1.0f / 298.15f) + (1.0f / 3950.0f) * log(r_ntc / 10000.0f))) - 273.15f;
return temp;
}
```
3. 在主函数中调用ADC读取和温度转换函数,以一定的时间间隔重复执行:
```c
int main(void)
{
// 初始化ADC和GPIO
MX_GPIO_Init();
MX_ADC1_Init();
// 循环读取ADC值并转换为温度
while (1)
{
// 读取ADC值
uint16_t adc_value = 0;
HAL_ADC_Start(&hadc1);
HAL_ADC_PollForConversion(&hadc1, HAL_MAX_DELAY);
adc_value = HAL_ADC_GetValue(&hadc1);
HAL_ADC_Stop(&hadc1);
// 转换为温度
float temp = ntc_convert_to_temp(adc_value);
// 打印温度值
printf("Temperature: %.2f C\r\n", temp);
// 等待一定时间
HAL_Delay(1000);
}
}
```
以上是基于NUCLEO-U575ZI-Q开发板使用ADC实时获取NTC的摄氏度温度的代码示例和步骤,希望能对你有所帮助。
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