98 lines
3.7 KiB
C
98 lines
3.7 KiB
C
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#include "bsp_adc.h"
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// https://www.cnblogs.com/gscw/p/17682385.html
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// 计算公式参考手册，建议使用 “建议实际可用测量电压范围” 作为 ADC 采集的增益选择判断标准。计算公式参考手册。
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// 仅使用 ADC 功能，同时降低功耗，可以将引脚的数字输入功能关闭，配置 R16_PIN_ANALOG_IE。 注：如果引脚用于模拟功能（ADC/TouchKey），建议将该引脚的数字输入功能关闭，即设置数字输入禁用，从而可以降低功耗，并有利于减少干扰。
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// PA9 引脚进行 ADC 采集，在置为浮空后，过 300ms 左右再进行 ADC 的采集。因为初次烧录的时候 boot 是串口功能开启的，PA9 是输出高电平。切换到浮空会需要等待时间。
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uint16_t adcBuff[40];
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volatile uint8_t adclen;
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volatile uint8_t DMA_end = 0;
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signed short RoughCalib_Value = 0; // ADC粗调偏差值
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uint32_t countadc = 0;
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uint16_t min_number = 0;
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uint16_t max_number = 0;
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double voltage = 0;
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void BSP_ADC_Init(void)
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{
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uint8_t i;
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/* 温度采样并输出 */
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PRINT("\n1.Temperature sampling...\n");
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ADC_InterTSSampInit();
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for (i = 0; i < 20; i++)
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{
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adcBuff[i] = ADC_ExcutSingleConver(); // 连续采样20次
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}
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for (i = 0; i < 20; i++)
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{
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uint32_t C25 = 0;
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C25 = (*((PUINT32)ROM_CFG_TMP_25C));
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PRINT("%d %d %d \n", adc_to_temperature_celsius(adcBuff[i]), adcBuff[i], C25);
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}
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// VBAT
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uint32_t CountBat = 0;
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ADC_InterBATSampInit();
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for (i = 0; i < 20; i++)
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{
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adcBuff[i] = ADC_ExcutSingleConver(); // 连续采样20次
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}
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for (i = 0; i < 20; i++)
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{
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CountBat += adcBuff[i];
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if (i == 0)
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{
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min_number = adcBuff[i];
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max_number = adcBuff[i];
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}
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min_number = ((min_number > adcBuff[i]) ? adcBuff[i] : min_number); // 软件滤波
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max_number = ((max_number < adcBuff[i]) ? adcBuff[i] : max_number);
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}
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printf("min_number = %d, max_number = %d\n", min_number, max_number);
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CountBat = (CountBat - min_number - max_number) / 18; // 删除最小与最大值
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printf("AverageCountBat = %d\n", CountBat);
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/* 单通道采样：选择adc通道3做采样，对应 PA13引脚， 带数据校准功能 */
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GPIOA_ModeCfg(GPIO_Pin_13, GPIO_ModeIN_Floating);
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// 6dB(2倍) (ADC/4096+0.5)*Vref 1.5*Vref 0.525V～1.575V 0.6V～1.5V
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ADC_ExtSingleChSampInit(SampleFreq_3_2, ADC_PGA_2);
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RoughCalib_Value = ADC_DataCalib_Rough(); // 用于计算ADC内部偏差，记录到全局变量 RoughCalib_Value中
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PRINT("RoughCalib_Value =%d \n", RoughCalib_Value);
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printf("PA13:::::\n");
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ADC_ChannelCfg(3);
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for (i = 0; i < 20; i++)
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{
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adcBuff[i] = ADC_ExcutSingleConver() + RoughCalib_Value; // 连续采样20次
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}
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printf("original: ");
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for (i = 0; i < 20; i++)
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{
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PRINT("%d ", adcBuff[i]); // 注意：由于ADC内部偏差的存在，当采样电压在所选增益范围极限附近的时候，可能会出现数据溢出的现象
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}
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printf("\n");
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for (i = 0; i < 20; i++)
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{
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countadc += adcBuff[i];
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if (i == 0)
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{
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min_number = adcBuff[i];
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max_number = adcBuff[i];
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}
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min_number = ((min_number > adcBuff[i]) ? adcBuff[i] : min_number); // 软件滤波
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max_number = ((max_number < adcBuff[i]) ? adcBuff[i] : max_number);
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}
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printf("min=%d, max=%d, diff=%d\n", min_number, max_number, (max_number - min_number));
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countadc = (countadc - min_number - max_number) / 18; // 删除最小与最大值
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printf("countaveradc = %d\n", countadc);
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voltage = (double)countadc / 2048 * 1.05;
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printf("voltage=%1.3lfv\n", voltage);
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}
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