QA40x_BareMetal

2

Very nice, thank you for the example code. I’d like to see an audio driver (like getting the ASIO QA401 driver running for current hardware). This could be a start.
The commands are hard-coded, no definition file? Some must be missing. How is the sample rate set, how to use the front panel I2S, how to read power stats, etc? There are 6 endpoints?
So far, got the relays clicking in Python, with this piece of code:

#!/usr/bin/env python3

import time # just for test
import struct
import libusb_package # pip install this, if missing

class Registers:
	def __init__(self, interface):
		self.endpoint_read = interface.endpoints()[0]
		self.endpoint_write = interface.endpoints()[1]
		
	def read(self, reg):
		self.write(0x80 | reg, 0)
		data = self.endpoint_read.read(4)
		(val,) = struct.unpack('>I', data)
		return val
		
	def write(self, reg, val):
		buf = struct.pack('>BI', reg, val)
		self.endpoint_write.write(buf)

class Levels:
	def __init__(self, registers):
		self.registers = registers
		self.input2reg = {0: 0, 6: 1, 12: 2, 18: 3, 24: 4, 30: 5, 36: 6, 42: 7}
		self.output2reg = {-12: 0, -2: 1, 8: 2, 18: 3}
	
	def set_input(self, gain):
		val = self.input2reg[gain]
		self.registers.write(5, val)
		
	def set_output(self, gain):
		val = self.output2reg[gain]
		self.registers.write(6, val)
	

def main():
	device = libusb_package.find(idVendor=0x16c0, idProduct=0x4e37) # QA402
	if device is None:
		device = libusb_package.find(idVendor=0x16c0, idProduct=0x4e39) # QA403
	if device is None:
		raise SystemExit("no analyzer found")
	
	device.set_configuration() # first one
	interface = device[0].interfaces()[0]
	registers = Registers(interface) # create register object

	print(registers.read(0))
	registers.write(0, 1234) # register test
	print(registers.read(0))

	levels = Levels(registers) # create level setting object
	
	for level in range(0, 42+1, 6): # test all input levels
		levels.set_input(level)
		time.sleep(1)

	for level in range(-12, 18+1, 10): # test all output levels
		levels.set_output(level)
		time.sleep(1)

if (__name__ == "__main__"):
	main()

Now need to learn how to do asynchronous USB transfer in Python…
(Python was just for a quick start)