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audio codec example refactured

This commit is contained in:
Christoph Haberer 2017-04-27 10:21:45 +02:00
parent b9d6eb9779
commit 59a58e7522
1 changed files with 13 additions and 20 deletions
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33
STM32/libraries/BoardExamples/examples/Discovery407VG/STM32F4_Discovery_CS43L22_AudioCodecBasicTest/STM32F4_Discovery_CS43L22_AudioCodecBasicTest.ino
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@ -1,4 +1,4 @@
/*
/*
STM32F4 Discovery basic audio codec setup example
This example sets up the CS43L22 and generates a sawtooth sound
@ -6,11 +6,10 @@
April 2014, ChrisMicro
Special thanks to Daniel Fekete for his gread STM32GENERIC support
Special thanks to Daniel Fekete for his gread STM32GENERIC support
*/
// The CS43L22 is a Low Power, Stereo DAC w/Headphone & Speaker Amps
//
// related links:
@ -18,7 +17,7 @@
// https://github.com/abhishek-kakkar/STM32F4Player/blob/master/STM32F4_Discovery_demo/codec_CS43L22.c
// https://www.mikrocontroller.net/topic/413574#4814689
#include <Wire.h>
#include "I2S.h"
@ -39,16 +38,13 @@ void codec_writeReg(unsigned char reg, unsigned char data)
error = Wire.endTransmission();
}
// each register retries until success
// if communication fails the device will hang
// codec setup from
// https://github.com/mubase/STM32F4-Arduino-core/blob/master/cores/maple/libmaple/stm32f4codec/codec.h
// TBD: to be refactured
void codec_reg_setup(void)
void codec_reg_setup(void)
{
Wire.begin();
codec_writeReg(0x02, 0x01); // power save registers -> all on
codec_writeReg(0x00, 0x99);
codec_writeReg(0x47, 0x80); //inits
@ -71,16 +67,16 @@ void codec_reg_setup(void)
void setup()
{
pinMode(USER_BTN, INPUT); //user button for sound stop, mandatory for STM MCUs if you want to use the button
pinMode(AUDIOCODEC_CS, OUTPUT); // the chip select pin of the codec needs to be enabled
pinMode(AUDIOCODEC_CS, OUTPUT); // the chip select pin of the codec needs to be enabled
//digitalWrite(AUDIOCODEC_CS, HIGH);
// start I2S
// I2S will also produce MCK for the codec of aroung 12Mhz
// without MCK the CS43L22 is not working
I2S.begin(I2S_PHILIPS_MODE, 44000, 16);
I2S.begin(I2S_PHILIPS_MODE, 44000, 16);
digitalWrite(AUDIOCODEC_CS, HIGH); // enable codec
Wire.begin(); // start the I2C driver for codec register setup
codec_reg_setup();
@ -89,14 +85,12 @@ void setup()
void loop()
{
static uint16_t n;
I2S.write(n += 300); // produce sound: simple triangle waveform
if ( digitalRead( USER_BTN ) )
if ( digitalRead( USER_BTN ) ) // sound on/off when button pressed
{
while (1) // stop sound when user button pressed
{
}
while(1);
}
}
@ -105,4 +99,3 @@ void loop()