NTC热敏电阻温度采集采用累加求平均值的方法。 uint32_t Resultvolt; //NTC电压 uint32_t Resistance; //NTC电阻 uint32_t electricity; //电流 int Temp; //int有符号,unsigned int是无符号,有符号无符号整型就是能不能存放负数。 //B值：3950 常温阻值为10k时的对照表 单位：Ω const int NTCTable[][2] = { {-40, 340928}, {-39, 318877}, {-38, 298397}, {-37, 279368}, {-36, 261676}, {-35, 245221}, {-34, 229907}, {-33, 215648}, {-32, 202366}, {-31, 189987}, {-30, 178445}, {-29, 167678}, {-28, 157629}, {-27, 148246}, {-26, 139480}, {-25, 131288}, {-24, 123629}, {-23, 116464}, {-22, 109760}, {-21, 103482}, {-20, 97603}, {-19, 92094}, {-18, 86930}, {-17, 82087}, {-16, 77544}, {-15, 73279}, {-14, 69275}, {-13, 65514}, {-12, 61980}, {-11, 58658}, {-10, 55534}, {-9, 52595}, {-8, 49829}, {-7, 47225}, {-6, 44772}, {-5, 42462}, {-4, 40284}, {-3, 38230}, {-2, 36294}, {-1, 34466}, { 0, 32742}, { 1, 31113}, { 2, 29575}, { 3, 28122}, { 4, 26749}, { 5, 25451}, { 6, 24223}, { 7, 23061}, { 8, 21962}, { 9, 20921}, { 10, 19936}, {11, 19002}, {12, 18118}, {13, 17280}, {14, 16485}, {15, 15731}, {16, 15016}, {17, 14337}, {18, 13693}, {19, 13081}, { 20, 12500}, {21, 11948}, {22, 11423}, {23, 10925}, {24, 10451}, {25, 10000}, {26, 9570}, {27, 9162}, {28, 8773}, {29, 8403}, { 30, 8051}, {31, 7715}, {32, 7395}, {33, 7090}, {34, 6799}, {35, 6522}, {36, 6257}, {37, 6005}, {38, 5764}, {39, 5534}, { 40, 5315}, {41, 5105}, {42, 4905}, {43, 4713}, {44, 4530}, {45, 4355}, {46, 4188}, {47, 4028}, {48, 3875}, {49, 3729}, { 50, 3589}, {51, 3455}, {52, 3326}, {53, 3203}, {54, 3086}, {55, 2973}, {56, 2865}, {57, 2761}, {58, 2662}, {59, 2566}, { 60, 2475}, {61, 2387}, {62, 2303}, {63, 2223}, {64, 2145}, {65, 2071}, {66, 1999}, {67, 1931}, {68, 1865}, {69, 1801}, { 70, 1741}, {71, 1682}, {72, 1626}, {73, 1572}, {74, 1520}, {75, 1470}, {76, 1422}, {77, 1375}, {78, 1331}, {79, 1288}, { 80, 1247}, {81, 1207}, {82, 1169}, {83, 1132}, {84, 1096}, {85, 1062}, {86, 1029}, {87, 997}, {88, 966}, {89, 937}, { 90, 908}, {91, 881}, {92, 854}, {93, 828}, {94, 804}, {95, 780}, {96, 757}, {97, 735}, {98, 713}, {99, 692}, {100, 672}, {101, 653}, {102, 634}, {103, 616}, {104, 599}, {105, 582} }; void NTCtp_config(void) { RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA,ENABLE); RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC,ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE); SysTick_Config_Init(); NTCtp_gpio_config(); NTCtp_usart_config(); NTCtp_nvic_config(); usart_release_gpio_int(); adc_config(); } void NTCtp_gpio_config(void) { GPIO_InitTypeDef GPIO_InitStructure; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; //采集电压 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOA,&GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_3; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_Init(GPIOC,&GPIO_InitStructure); GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_1); //TX GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_1); //RX } void NTCtp_usart_config(void) { USART_InitTypeDef USART_InitStructure; USART_InitStructure.USART_BaudRate = 9600; /*波特率*/ USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; /*流控*/ USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx; USART_InitStructure.USART_WordLength = USART_WordLength_8b; /*数据位，8*/ USART_InitStructure.USART_Parity = USART_Parity_No; /*校验位，n*/ USART_InitStructure.USART_StopBits = USART_StopBits_1; /*停止位，1*/ USART_Init(USART2,&USART_InitStructure); USART_ClearFlag(USART2,USART_FLAG_TC); //清除发送完成标志位 USART_Cmd(USART2,ENABLE); //使能串口2 USART_ITConfig(USART2,USART_IT_RXNE,ENABLE); } void NTCtp_nvic_config(void) { NVIC_InitTypeDef NVIC_InitStructure; NVIC_InitStructure.NVIC_IRQChannelPriority = 0; NVIC_InitStructure.NVIC_IRQChannel = USART3_6_IRQn; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); } int fputc(int ch, FILE *f) //IAR重定向printf函数 { //while (USART_GetFlagStatus(USART3,USART_FLAG_TC) == RESET ) while (USART_GetFlagStatus(USART3,USART_FLAG_TXE) == RESET ) { } USART_SendData(USART3,(uint8_t) ch); return ch; } void adc_config(void) { ADC_DeInit(ADC1); //初始化 ADC_InitTypeDef ADC_InitStructure; ADC_StructInit(&ADC_InitStructure); ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //转换使能 ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //右对齐 ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None; ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; //12位分辨率 ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward; //浏览方向 ADC_Init(ADC1,&ADC_InitStructure); ADC_ChannelConfig(ADC1, ADC_Channel_3, ADC_SampleTime_239_5Cycles); //PA3 通道3 USART2 ADC_GetCalibrationFactor(ADC1); //校验 ADC_Cmd(ADC1,ENABLE); while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADRDY)); //等待就绪 ADC_StartOfConversion(ADC1); //启动ADC } void ADC_Check(void) { uint8_t i; for(i=0; i<2; i++) { while(ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET); Resultvolt = (uint32_t) ADC_GetConversionValue(ADC1); Resultvolt = (Resultvolt*3300)/4096; //电压 mv electricity = Resultvolt*1000/5100; //电流 uA Resistance = 3300*1000/electricity - 5100; //电阻 Ω } } void look_up_table(void) { uint8_t i; ADC_Check(); //采集电压 for (i = 0; i < 145; i++) { if (NTCTable[1] > Resistance) continue; // continue是结束本次循环。 break是结束循环。 else { Temp = NTCTable[0]-1; if (Temp < -40) Temp = -40; else if (Temp > 105) Temp = 105; break; } } } void USART2_6_IRQHandler(void) { if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET) //判断读寄存器是否有数据 { USART_ClearITPendingBit(USART2,USART_IT_RXNE); //清除发送完成标志位 // Resultvolt = USART_ReceiveData(USART2); } } |
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