A clock and pulse generator using the I2S interface on an esp8266

• Clock generation from 2Hz to 20MHz
• Any frequency may be used
• Searches for best match of clock dividers and bit length from 160MHz base clock
• Typically better than 0.1% match for frequencies < 100KHz
• Mark space ratio selection
• Frequency matching tolerance may be relaxed to get better mark space handling
• Pulse train generation based on defintions in files
• Web based GUI allowing control from PC, phone, tablet
• Wifi Management to allow easy initial router set up
• OTA software update
• Uses a special I2s library (i2sTXcircular) giving flexible control

• Install i2sTXcircular library (included)
• Install BaseSupport library (https://github.com/roberttidey/BaseSupport)
• Needs WifiManager library
• Edit passwords in BaseConfig.h
• Compile and upload in Arduino environment
• Set up wifi network management by connecting to AP and browsing to 192.168.4.1
• upload basic set of files from data folder using STA ip/upload
• further uploads can then be done using ip/edit
• normal interface is at ip/
• Set TargetHz and duty cycle to find best match
• Advanced shows calculated parameters
• Tolerance may be increased to find a match with most bits that meets tolerance
• bitsPerWord may be entered to find match that uses this number per I2S word cycle
• A range may be put in to bitsPerWord to allow searching e.g. 24,31
• Word length (0-15) may be put into advanced section. This does not effect the clock but does change the word select signal to be from 16 - 31 bits of raw bit clock