测试硅麦的输出数据

01 数字硅麦

一、背景介绍

手边的这个数字硅麦，是来自Infineon提供的样品，它的接口是PDM输出。在前面已经对该传感器进行过初步的测试。现在使用ESP32平台来读取该它的输出信号。根据测试，硅麦要求时钟信号大于400kHz，利用ESP32的SPI接口可以输出超过这个频率的时钟信号，同时可以读入相应的数据。

二、ESP32输入输出

1、测试SPI脉冲

根据 WS2812串行可控彩色LED灯珠 中的测试程序。编写SPI基本测试脉冲程序。通过管脚14输出时钟信号，时钟频率为2.5MHz。这是测量ESP32第12管脚输出波形，可以看到对应的周期为400ns，频率为2.5MHz。

from machine                import Pin,Timer,SPI
import timehspi = SPI(1, 2500000, sck=Pin(14), mosi=Pin(13), miso=Pin(12), polarity=0)outbyte = bytes([0xff]*16)print("Test.")
while True:hspi.write(outbyte)time.sleep_ms(10)

▲ 图1.2.1 SPI管脚分布

下面将SPI 输出频率修改成500KHz，输入输出2000个字节。这是测量硅麦PDM输出波形。下面看看其中脉冲结构。前面1ms是芯片启动。这部分是内部稳定时输出信号这里可以看到输出带有信号的波形。

from machine                import Pin,Timer,SPI
import timehspi = SPI(1, 500000, sck=Pin(14),mosi=Pin(13), miso=Pin(12), polarity=0)print("Test.")
while True:readb = hspi.read(2048)time.sleep_ms(1)breakprint(readb)

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■ 相关文献链接:

WS2812串行可控彩色LED灯珠

● 相关图表链接:

图1.2.1 SPI管脚分布

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使用ESP32读取数字硅麦的数据

01 数字硅麦

一、背景介绍

二、ESP32输入输出

1、测试SPI脉冲

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