请教下，G435 电池供电VDDA 不准，怎么测试温度？
我本来是打开VREFBUFF 2.048V 的参考电压，(*((uint32_t*)(0x40001800+0x24))) |= 3<<19; 结果ADC_IN18 测试的数据是4090 ， 如果我不打开2.048V 电压，ADC_IN18测量值是2533， 我使用这个公式， VDDA = 4096*2.048V / 4090 ，按照打开VREFBUFF 2.048V 时候的测量值4090，这个VDDA明显错了，请问下 是不是反推公式不对？
如果VDDA 确定了，是否可以这样计算温度？谢谢 Temperate=((V30+Vc0-TempAdVal)*VDDA 反推电压/4095)/AVG_SLOPE+30.0f-Tc1;
以下是我的代码，参考国民的ADC 例程,谢谢
/**
* @file main.c
* @author Nations
* @version v1.2.0
*
* @CopyRight Copyright (c) 2022, Nations Technologies Inc. All rights reserved.
*/
#include <stdio.h>
#include "main.h"
/** @addtogroup ADC_ADC1_DMA
* @{
*/
ADC_InitType ADC_InitStructure;
DMA_InitType DMA_InitStructure;
__IO uint16_t ADCConvertedValue[3];
USART_InitType USART_InitStructure;
void RCC_Configuration(void);
void Delay(__IO uint32_t nCount);
void USART_Config(void);
/*Vc0 is the ADC compensation value*/
#define Vc0 0 //X
/*Tc1 is the temprature compensation value*/
#define Tc1 1.5f
/*V30 is the voltage value at 30 degree Celsius by factory default*/
uint16_t V30 = 0;
uint16_t ADvalue = 0;
uint32_t temp = 0;
#ifdef DEFINEFLOAT //Float
__IO float TempValue;
/*xx mv per degree Celsius by datasheet define*/
#define AVG_SLOPE 0.004f
/**
* @brief Cal temp use float result.
*/
float TempCal(uint16_t TempAdVal)
{
float Temperate;
/* Get the temperature inside the chip */
Temperate=((V30+Vc0-TempAdVal)*3.3/4095)/AVG_SLOPE+30.0f-Tc1;
return Temperate;
}
#else
__IO int16_t TempValue;
/*xx mv per degree Celsius by datasheet define*/
#define AVG_SLOPE 4
/**
* @brief Cal temp use integer result.
*/
int16_t TempCal(uint16_t TempAdVal)
{
int16_t Temperate;
/* Get the temperature inside the chip */
Temperate=(int16_t)((((V30+Vc0-TempAdVal)*33*1000)/(4095*10))/AVG_SLOPE+30-Tc1);
return Temperate;
}
#endif
/**
* @brief Main program
*/
int main(void)
{
/* System clocks configuration ---------------------------------------------*/
RCC_Configuration();
// (*((uint32_t*)(0x40001800+0x24))) |= 3<<19;
/* DMA channel1 configuration ----------------------------------------------*/
DMA_DeInit(DMA_CH1);
DMA_InitStructure.PeriphAddr = (uint32_t)&ADC->DAT;
DMA_InitStructure.MemAddr = (uint32_t)ADCConvertedValue;
DMA_InitStructure.Direction = DMA_DIR_PERIPH_SRC;
DMA_InitStructure.BufSize =3;
DMA_InitStructure.PeriphInc = DMA_PERIPH_INC_DISABLE;
DMA_InitStructure.DMA_MemoryInc = DMA_MEM_INC_ENABLE;
DMA_InitStructure.PeriphDataSize = DMA_PERIPH_DATA_SIZE_HALFWORD;
DMA_InitStructure.MemDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.CircularMode = DMA_MODE_CIRCULAR;
DMA_InitStructure.Priority = DMA_PRIORITY_HIGH;
DMA_InitStructure.Mem2Mem = DMA_M2M_DISABLE;
DMA_Init(DMA_CH1, &DMA_InitStructure);
DMA_RequestRemap(DMA_REMAP_ADC1, DMA, DMA_CH1, ENABLE);
/* Enable DMA channel1 */
DMA_EnableChannel(DMA_CH1, ENABLE);
ADC_DeInit(ADC);
/* ADC1 configuration ------------------------------------------------------*/
ADC_InitStructure.MultiChEn = ENABLE;
ADC_InitStructure.ContinueConvEn = ENABLE;
ADC_InitStructure.ExtTrigSelect = ADC_EXT_TRIGCONV_NONE;
ADC_InitStructure.DatAlign = ADC_DAT_ALIGN_R;
ADC_InitStructure.ChsNumber = 3;
ADC_Init(ADC, &ADC_InitStructure);
/* ADC1 enable temperature */
ADC_EnableTempSensorVrefint( ENABLE);
/* ADC1 regular ADC_CH_TEMP_SENSOR configuration */
ADC_ConfigRegularChannel(ADC, ADC_CH_TEMP_SENSOR , 1, ADC_SAMP_TIME_239CYCLES5);
ADC_ConfigRegularChannel(ADC, ADC_CH_17, 2, ADC_SAMP_TIME_239CYCLES5);
ADC_ConfigRegularChannel(ADC, ADC_CH_18, 3, ADC_SAMP_TIME_239CYCLES5);
/* Enable ADC DMA */
ADC_EnableDMA(ADC, ENABLE);
/* Enable ADC */
ADC_Enable(ADC, ENABLE);
/* Check ADC Ready */
while(ADC_GetFlagStatusNew(ADC,ADC_FLAG_RDY) == RESET)
;
/* Start ADC1 calibration */
ADC_StartCalibration(ADC);
/* Check the end of ADC1 calibration */
while (ADC_GetCalibrationStatus(ADC))
;
/* Start ADC1 Software Conversion */
ADC_EnableSoftwareStartConv(ADC, ENABLE);
/* Config Uart1 as Temperature output */
USART_Config();
V30 = *(__IO uint32_t*)((uint32_t)0x1FFFF7D0);
while (1)
{
/* */
TempValue = TempCal(ADCConvertedValue[0]);
#ifdef DEFINEFLOAT
printf("\r\n Temperature = %.3f C\r\n",TempValue);
#else
printf("\r\n Temperature = %d C\r\n",TempValue);
#endif
// Delay(500);
Delay(5000000);
printf("ADCConvertedValue[0] = %d\r\n",ADCConvertedValue[1]);
Delay(5000000);
TempValue = TempCal(ADCConvertedValue[1]);
printf("Temperature = %.3f C\r\n",TempValue);
Delay(5000000);
printf("VREFBUF = %d\r\n",ADCConvertedValue[2]);
}
}
/**
* @brief Configures the different system clocks.
*/
void RCC_Configuration(void)
{
/* Enable peripheral clocks ------------------------------------------------*/
/* Enable DMA clocks */
RCC_EnableAHBPeriphClk(RCC_AHB_PERIPH_DMA, ENABLE);
/* Enable GPIOC clocks */
RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_GPIOC, ENABLE);
/* Enable ADC clocks */
RCC_EnableAHBPeriphClk(RCC_AHB_PERIPH_ADC, ENABLE);
/* RCC_ADCHCLK_DIV16*/
ADC_ConfigClk(ADC_CTRL3_CKMOD_AHB, RCC_ADCHCLK_DIV16);
RCC_ConfigAdc1mClk(RCC_ADC1MCLK_SRC_HSE, RCC_ADC1MCLK_DIV8); //selsect HSE as RCC ADC1M CLK Source
}
/**
* @brief Delay funciton.
*/
void Delay(__IO uint32_t nCount)
{
for(; nCount != 0; nCount--);
}
/*
* @brief uart configure as 115200 8-N-1
*/
void USART_Config(void)
{
GPIO_InitType GPIO_InitStructure;
/* Enable GPIO clock */
GPIO_APBxClkCmd(USARTx_GPIO_CLK, ENABLE);
/* Enable USARTx Clock */
USART_APBxClkCmd(USARTx_CLK, ENABLE);
/* Initialize GPIO_InitStructure */
GPIO_InitStruct(&GPIO_InitStructure);
/* Configure USARTx Tx as alternate function push-pull */
GPIO_InitStructure.Pin = USARTx_TxPin;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Alternate = USARTx_Tx_GPIO_AF;
GPIO_InitPeripheral(USARTx_GPIO, &GPIO_InitStructure);
GPIO_InitStructure.Pin = GPIO_PIN_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Analog;
GPIO_InitPeripheral(GPIOA, &GPIO_InitStructure);
/* Configure USARTx Rx as alternate function push-pull and pull-up */
GPIO_InitStructure.Pin = USARTx_RxPin;
GPIO_InitStructure.GPIO_Pull = GPIO_Pull_Up;
GPIO_InitStructure.GPIO_Alternate = USARTx_Rx_GPIO_AF;
GPIO_InitPeripheral(USARTx_GPIO, &GPIO_InitStructure);
/* USARTy and USARTz configuration ------------------------------------------------------*/
USART_InitStructure.BaudRate = 115200;
USART_InitStructure.WordLength = USART_WL_8B;
USART_InitStructure.StopBits = USART_STPB_1;
USART_InitStructure.Parity = USART_PE_NO;
USART_InitStructure.HardwareFlowControl = USART_HFCTRL_NONE;
USART_InitStructure.Mode = USART_MODE_RX | USART_MODE_TX;
/* Configure USARTx */
USART_Init(USARTx, &USART_InitStructure);
/* Enable the USARTx */
USART_Enable(USARTx, ENABLE);
}
/* retarget the C library printf function to the USART */
int fputc(int ch, FILE* f)
{
USART_SendData(USARTx, (uint8_t)ch);
while (USART_GetFlagStatus(USARTx, USART_FLAG_TXDE) == RESET)
;
return (ch);
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file pointer to the source file name
* @param line assert_param error line source number
*/
void assert_failed(const uint8_t* expr, const uint8_t* file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/**
* @}
*/
/**
* @}
*/
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