CCS C Software and Maintenance Offers
FAQFAQ   FAQForum Help   FAQOfficial CCS Support   SearchSearch  RegisterRegister 

ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

CCS does not monitor this forum on a regular basis.

Please do not post bug reports on this forum. Send them to CCS Technical Support
Volume control chip M62429 driver

 
Post new topic   Reply to topic    CCS Forum Index -> General CCS C Discussion
View previous topic :: View next topic  
Author Message
tonkostz



Joined: 07 May 2011
Posts: 54
Location: Bulgaria

View user's profile Send private message

Volume control chip M62429 driver
PostPosted: Wed Jan 01, 2025 5:15 am     Reply with quote
I am trying to adapt an arduino driver for a olume control chip M62429 to CCS C compiler but i am not sure i understand this section of the code. Would you help on this?
Code:
  // Send control word
  for (uint8_t i = 0; i < 11; i++) {
    delayMicroseconds (2);
    digitalWrite (_pin_data, 0);
    delayMicroseconds (2);
    digitalWrite (_pin_clk, 0);
    delayMicroseconds (2);
    digitalWrite (_pin_data, (data_word >> i) & 0x01);
    delayMicroseconds (2);
    digitalWrite (_pin_clk, 1);
  }
  delayMicroseconds (2);
  digitalWrite (_pin_data, 1);
  delayMicroseconds (2);
  digitalWrite (_pin_clk, 0);
}


This is to complete code:
Code:
/*!
 *  This is a library for M62429/FM62429 Serial data control dual electronics volume chips.
 *
 *  Written by CGrassin.
 */

#include "Arduino.h"
#include "M62429.h"

M62429::M62429 (uint8_t pin_clk, uint8_t pin_data){
   _pin_data = pin_data;
   _pin_clk = pin_clk;
}

/*
 * Sets the volume of one on both channel of the 62429.
 *
 * Parameters:
 * attenuation, from 0 to 83dB
 * both, 0 (default)=both channels or 1=individual
 * channel, 0=channel 1, 1 = channel 2, no effect if both=0
 */
void M62429::_setVolume(uint8_t attenuation, uint8_t channel, uint8_t both){
  uint16_t data_word = 0x00;

  // Sanity checks on parameters
  if(both>1 || channel>1)
     return;
  if(attenuation > 83)
    attenuation = 83;

  // Convert volume to attenuation
  //uint8_t attenuation = (volume > 100) ? 0 : (((volume * 83) / -100) + 83);


  // Build control word (11 bits)
  data_word |= (channel << 0);            // Channel select: 0=ch1, 1=ch2
  data_word |= (both    << 1);             // Individual/both select: 0=both, 1=individual
  data_word |= ((21 - (attenuation / 4)) << 2);    // ATT1: coarse attenuator, steps of -4dB
  data_word |= ((3 -  (attenuation % 4)) << 7);  // ATT2: fine attenuator, steps of -1dB)
  data_word |= (0b11 << 9);             // 2 last bits must be 1

  // Send control word
  for (uint8_t i = 0; i < 11; i++) {
    delayMicroseconds (2);
    digitalWrite (_pin_data, 0);
    delayMicroseconds (2);
    digitalWrite (_pin_clk, 0);
    delayMicroseconds (2);
    digitalWrite (_pin_data, (data_word >> i) & 0x01);
    delayMicroseconds (2);
    digitalWrite (_pin_clk, 1);
  }
  delayMicroseconds (2);
  digitalWrite (_pin_data, 1);
  delayMicroseconds (2);
  digitalWrite (_pin_clk, 0);
}

void M62429::setVolumeBoth(uint8_t attenuation){
  _setVolume(attenuation, 0, 0);
}

void M62429::setVolumeCh1(uint8_t attenuation){
  _setVolume(attenuation, 0, 1);
}

void M62429::setVolumeCh2(uint8_t attenuation){
  _setVolume(attenuation, 1, 1);
}


M62429.h
Code:
/*!
 *  This is a library for M62429/FM62429 Serial data control dual electronics volume chips.
 *
 *  Written by CGrassin.
 */

#ifndef M62429_H
#define M62429_H

class M62429 {
public:
  M62429 (uint8_t pin_clk, uint8_t pin_data);
  void setVolumeBoth(uint8_t attenuation);
  void setVolumeCh1 (uint8_t attenuation);
  void setVolumeCh2 (uint8_t attenuation);
 
private:
  uint8_t _pin_data, _pin_clk;
  void _setVolume(uint8_t attenuation, uint8_t channel, uint8_t both);
};

#endif


As i understood it is basically a dual digital potentiometer like MCP42xx for which i have driver. Is it possible to adapt it for this chip?
Thanks!
Ttelmah



Joined: 11 Mar 2010
Posts: 19588

View user's profile Send private message

PostPosted: Wed Jan 01, 2025 8:21 am     Reply with quote
Read the dats sheet!.......

Seriously this is a very easy chip to drive.

All you do it clock 11 bits to the chip.
Code:

#define CLOCK_PIN pin_xx //set to what you want
#define DATA_PIN pin_yy //again set to what you want

void set_volume(unsigned int8 att, int1 chan, int1 both_flag)
{
   int16 val=0x60; //Preload the upper two 1's
   int8 ctr;
   int16 mask=1; //mask bit
   output_low(CLOCK_PIN); //ideally set this low in your initialisation
   if (att1>83)
       att1=83;
   val |= ((21 - (att / 4L)) << 2);    // ATT1: coarse attenuator, steps of
   //-4dB
   val |= ((3 -  (att % 4L)) << 7);  // ATT2: fine attenuator, steps
   //of -1dB)  - Note the L here, needed so the value gets extended to
   //an int16 for the rotation. 
   if (chan)
      bit_set(val,0); //channel 0/1 selection
   if (both_flag)
      bit_set(val,1); //If this is set will write both channels at once
   for (ctr=0;ctr<11;ctr++)
   {
      if(mask & val)
          output_high(DATA_PIN);
      else
          output_low(DATA_PIN);
      delay_us(1);
      output_high(CLOCK_PIN); //Latch the bit out.
      mask*=2;
      output_low(DATA_PIN);
      delay_us(1);
      if (ctr!=10)
          output_low(DATA_PIN);
      output_low(CLOCK_PIN);
      delay_us(1);
   }
}

I send the channel and both_flag each as one bit values, so no need
to test for these being >1.
Display posts from previous:   
Post new topic   Reply to topic    CCS Forum Index -> General CCS C Discussion All times are GMT - 6 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group