Test cs4344 stereo DA converter

Jane Medium ： This paper tests the use of SPI drive CS4344 The experiment of ,  But in the end, the correct results were not observed . The specific reason is unknown .

key word ：CS4344;SPI

 

§01 structure Build test circuit

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One 、 background

   This is preparation MicroPython In the kernel notes, during the experiment ,  See that there is a CS4344,  This is a two channel stereo DA converter ,  I haven't used it before , Use this platform to test today .

  

Two 、 Circuit diagram

   This is on the circuit board CS4344 Circuit diagram ,  It passes through E3,4,5 as well as D3 Connected with MCU .  Input and output E6, Master clock is E5,  Select left and right channels E4,  Clock mode switching use D3.  Pass below MM32F3277 Upper MicroPython, adopt SPI The interface test CS4344 chip .

  
   Due to the current MicroPython Only three routes are supported SPI Interface ,  Their external pins are not E5,E6,  So we need to connect SPI Mouth and CS4344 The pins are connected .  If you use SPI0, Will PA5 Connect E5,】 take PA7 Connect E6.  This is the connected circuit board .

  

   Later, a jumper with one pulling two was used , Direct will SPI Of CLK guide SCLK/MCLK On .  After actual testing , Find out in the end CS4344 There is still no signal output .  This is the data signal With the output analog signal . There was no response .

  

 

※ total    junction ※

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   Ben This paper tests the use of SPI drive CS4344 The experiment of ,  But in the end, the correct results were not observed . The specific reason is unknown .
  

One 、 The test program

from machine                import Pin,SPI
import time
lrck    = Pin('PE4', Pin.OUT_PUSHPULL, value=0)
spi0    = SPI(0,baudrate=800000, polarity=0, phase=0)
led0    = Pin('PA1', Pin.OUT_PUSHPULL, value=1)
print(spi0)
def outdata(left,right):
    lrck(0)
    spi0.write(left.to_bytes(4,1))
    lrck(1)
    spi0.write(right.to_bytes(4,1))
    lrck(0)
print('Test CS4344 DA convert.')
count = 0
while True:
    count += 1
    if count % 1:
        outdata(0xaaaa, 0x5555)
    else: outdata(0x5555, 0xaaaa)
    time.sleep_ms(1)

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