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PGA2311 STM32F4 HowTo?


mwpost

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Hi,

 

Ok good news, I got it working :smile:

I use PGA4311 (SMD IC), and my mute pin, after living 10 years in a junk box was broken (I made an error and connect it to GND instead on +5V on my original PCB, and then use a wire to correct this... but the pin didn't handle it over the years).

 

So the modification I made is in APP_init:

  MIOS32_SPI_IO_Init(2, MIOS32_SPI_PIN_DRIVER_WEAK);
  MIOS32_SPI_TransferModeInit(2, MIOS32_SPI_MODE_CLK0_PHASE0, MIOS32_SPI_PRESCALER_16); // ca. 5 MBit

 

I don't really understand how this and prescaler work, but with those settings I can set the gain.

I'll add encoder support for volume change and post the source code.

Edited by pilo
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Here's my test app, it should work now (unless you have an hardware issue).

 

/*
 * MIOS32 TI PGA2310/2311/4311 test app 
 *
 * ==========================================================================
 *
 *  Copyright © 2015 pilo ()
 *  Licensed for personal non-commercial use only.
 *  All other rights reserved.
 * 
 * ==========================================================================
 */

/////////////////////////////////////////////////////////////////////////////
// Include files
/////////////////////////////////////////////////////////////////////////////

#include <mios32.h>
#include "app.h"

// warning, buffer should be at least 9 byte long!
void PGAGainTodB(char *buffer, u8 gain) {
  if(gain == 0) {
    sprintf(buffer, "mute");
    return;
  }
  
  // else
  int _dB = 315 - (1275 - gain * 5);
  int dB = fabs(_dB / 10);
  int mod = fabs(_dB % 10);
  
  if(mod == 0) 
    sprintf(buffer, "%ddB", _dB / 10);
  else
    sprintf(buffer, "%s%d%s%ddB", 
	    _dB < 0 ? "-" : "", // sign
	    dB,  
	    mod != 0 ? "." : "", 
	    mod != 0 ? mod : "");
}

void SetPGAGain(u8 leftGain, u8 rightGain) {
  MIOS32_SPI_RC_PinSet (2,0,0);
  MIOS32_SPI_TransferByte(2, rightGain); // right
  MIOS32_SPI_TransferByte(2, leftGain); // left
  MIOS32_SPI_TransferByte(2, rightGain); // 3 (for PGA4311)
  MIOS32_SPI_TransferByte(2, leftGain); // 4
  MIOS32_SPI_RC_PinSet (2,0,1);

  //MIOS32_MIDI_SendDebugMessage("SetPGAGain : %d %d\n", leftGain, rightGain);
}

u8 volumeEncPos = 192; // 0dB
#define NUM_ENCODERS 64

/////////////////////////////////////////////////////////////////////////////
// This hook is called after startup to initialize the application
/////////////////////////////////////////////////////////////////////////////
void APP_Init(void)
{
  // initialize all LEDs
  MIOS32_BOARD_LED_Init(0xffffffff);

  // initialize SPI IO pins and protocol
  MIOS32_SPI_IO_Init(2, MIOS32_SPI_PIN_DRIVER_WEAK);
  MIOS32_SPI_TransferModeInit(2, MIOS32_SPI_MODE_CLK0_PHASE0, MIOS32_SPI_PRESCALER_16); // ca. 5 MBit

  // initialize rotary encoders of the same type (DETENTED2)
  int enc;
  for(enc=0; enc<NUM_ENCODERS; ++enc) {
    u8 pin_sr = (enc >> 2) + 1; // each DIN SR has 4 encoders connected
    u8 pin_pos = (enc & 0x3) << 1; // Pin position of first ENC channel: either 0, 2, 4 or 6

    mios32_enc_config_t enc_config = MIOS32_ENC_ConfigGet(enc);
    enc_config.cfg.type = DETENTED2; // see mios32_enc.h for available types
    enc_config.cfg.sr = pin_sr;
    enc_config.cfg.pos = pin_pos;
#if 1
    // normal speed, incrementer either 1 or -1
    enc_config.cfg.speed = NORMAL;
    enc_config.cfg.speed_par = 0;
#else
    // higher incrementer values on fast movements
    enc_config.cfg.speed = FAST;
    enc_config.cfg.speed_par = 2;
#endif
    MIOS32_ENC_ConfigSet(enc, enc_config);
  }
}


/////////////////////////////////////////////////////////////////////////////
// This task is running endless in background
/////////////////////////////////////////////////////////////////////////////
void APP_Background(void)
{
  MIOS32_MIDI_SendDebugMessage("Started PGA test app\n");

  SetPGAGain(volumeEncPos, volumeEncPos);

  while(1) {
  }
}


/////////////////////////////////////////////////////////////////////////////
// This hook is called each mS from the main task which also handles DIN, ENC
// and AIN events. You could add more jobs here, but they shouldn't consume
// more than 300 uS to ensure the responsiveness of buttons, encoders, pots.
// Alternatively you could create a dedicated task for application specific
// jobs as explained in $MIOS32_PATH/apps/tutorials/006_rtos_tasks
/////////////////////////////////////////////////////////////////////////////
void APP_Tick(void)
{
  // PWM modulate the status LED (this is a sign of life)
  u32 timestamp = MIOS32_TIMESTAMP_Get();
  MIOS32_BOARD_LED_Set(1, (timestamp % 20) <= ((timestamp / 100) % 10));
}


/////////////////////////////////////////////////////////////////////////////
// This hook is called each mS from the MIDI task which checks for incoming
// MIDI events. You could add more MIDI related jobs here, but they shouldn't
// consume more than 300 uS to ensure the responsiveness of incoming MIDI.
/////////////////////////////////////////////////////////////////////////////
void APP_MIDI_Tick(void)
{
}


/////////////////////////////////////////////////////////////////////////////
// This hook is called when a MIDI package has been received
/////////////////////////////////////////////////////////////////////////////
void APP_MIDI_NotifyPackage(mios32_midi_port_t port, mios32_midi_package_t midi_package)
{
}


/////////////////////////////////////////////////////////////////////////////
// This hook is called before the shift register chain is scanned
/////////////////////////////////////////////////////////////////////////////
void APP_SRIO_ServicePrepare(void)
{
}


/////////////////////////////////////////////////////////////////////////////
// This hook is called after the shift register chain has been scanned
/////////////////////////////////////////////////////////////////////////////
void APP_SRIO_ServiceFinish(void)
{
}


/////////////////////////////////////////////////////////////////////////////
// This hook is called when a button has been toggled
// pin_value is 1 when button released, and 0 when button pressed
/////////////////////////////////////////////////////////////////////////////
void APP_DIN_NotifyToggle(u32 pin, u32 pin_value)
{
}


/////////////////////////////////////////////////////////////////////////////
// This hook is called when an encoder has been moved
// incrementer is positive when encoder has been turned clockwise, else
// it is negative
/////////////////////////////////////////////////////////////////////////////
void APP_ENC_NotifyChange(u32 encoder, s32 incrementer)
{
  int value = volumeEncPos + incrementer;

  // clamp the value
  if(value < 0)
    value = 0;
  
  if(value > 255)
    value = 255;
  
  // set the gain
  volumeEncPos = value;
  SetPGAGain(volumeEncPos, volumeEncPos);
  
  // print gain in dB
  char dbBuffer[9];
  PGAGainTodB(dbBuffer, volumeEncPos);
  MIOS32_MIDI_SendDebugMessage("%s\n", dbBuffer);
}


/////////////////////////////////////////////////////////////////////////////
// This hook is called when a pot has been moved
/////////////////////////////////////////////////////////////////////////////
void APP_AIN_NotifyChange(u32 pin, u32 pin_value)
{
}

Edited by pilo
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Vive la France, Pilo!

 

Many thousand "Thanks" for this so far. :thumbsup:  It seems to - for whatever reason - both :excl: of my PGA2311s are defect.  The code doesn't work with none of them. And if this works for you, a hardware issue is my last guess. I'll order new ICs and will try your code again with these. I'll let you know as soon as I have received them. The ICs are very expensive in Germany so I'll order them in the States. But this will take approx 2 weeks best case unless customs clearance will be quick.

 

Kind regards to St. Etienne!

 

mwpost

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Thank you ;)

When i said it might be a hardware issue, I was thinking about something like wiring issue.

I fried my testing psu (for the analog +5/-5v) yesterday while working on this, I might have made a modification to the code that prevent it from working after (I wrote the value to dB code after my PSU made some smoke).

Also it would be a shame both your PGA chips are broken. I think before ordering new ones there are other things to check ;)

First, I use lpc17 core, I don't think it should make a big difference, but maybe it is.

Then how did you wire your power supply? I use the +5v from the core for the digital side of the PGA, and another external PSU for the analog side (I build a new one today, not finished yet). Both ground (analog and digital) are connected.

Mute and ZCEN are connected to the +5v from the core.

Of course analog and digital +5v ARE NOT connected together.

Double check your wiring, there might be an error somewhere. No sound at all when you run the application? (Without turning any encoder)

Edited by pilo
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