I have been struggling to use my new Teensy 3.2 and the audio shield with an SDcard for the audio tutorial. This has taken a week or 2 of my time including emails to Robin and Paul outlining my issues. Paul suggested posting here in the forum. The issue is the Sdcard is intermittent, it appears to be related to how long the Teensy combo is powered up.
As a background I added the 25K pot, microphone with washer and Winbond 25Q128JV spi flash chip to the audio shield. I added pins to the shield and sockets with long pins to the Teensy so I could place the combo on a breadboard. I started to work through the audio tutorial and it passed the hardware test, played a wav file from the Sandisk 32GB Ultra SDcard just fine. I was working my way through the section 2 examples and was doing the optional section on changing the delays when the wav file stopped playing. I then got the message that "Unable to access the SD card". Since then I have tried retouching all solder connections I made, I removed the audio shield and attached an external SDcard breakout using the same pins as the shield uses and it passes the SD card test in the examples. I have been trying to take adequate pictures and video to show what is happening but in essence the issue that occurs is as follows. Using the provided example for testing the audio shield hardware found in Examples->Audio->tutorial->TestTutorialkit, the pots,switches and microphone all work, I get to hear Paul's voice telling me the knobs and switches, buttons are registering and the example wav file begins to play, after about 10 seconds there is a loud buzz and the Teensy and demo no longer respond to the buttons to stop, reloading software allows all the basic hardware to function except playing the wav file from the sdcard. (Paul's voice tells me that there is no sdcard). It appears to be time/heat related as if I wait some minutes before retrying I can get some sound from the Sdcard before it quits again. As additional info, the SPI flash chip shows a similar intermittent issue using the examples under SPIFlash for writing, reading and erasing such that it sometimes works well and other times complains about not being able to access the SPIFlash chip. All other hardware for playing samples in the tutorial seem to work, which seems to implicate the SPI part of the circuitry on the audio shield, as the external SDCard has never shown any indication of not working. Possibly it is the Teensy3.2 but it's hard to say conclusively which is as fault.
Any suggestions would be welcome.
As a background I added the 25K pot, microphone with washer and Winbond 25Q128JV spi flash chip to the audio shield. I added pins to the shield and sockets with long pins to the Teensy so I could place the combo on a breadboard. I started to work through the audio tutorial and it passed the hardware test, played a wav file from the Sandisk 32GB Ultra SDcard just fine. I was working my way through the section 2 examples and was doing the optional section on changing the delays when the wav file stopped playing. I then got the message that "Unable to access the SD card". Since then I have tried retouching all solder connections I made, I removed the audio shield and attached an external SDcard breakout using the same pins as the shield uses and it passes the SD card test in the examples. I have been trying to take adequate pictures and video to show what is happening but in essence the issue that occurs is as follows. Using the provided example for testing the audio shield hardware found in Examples->Audio->tutorial->TestTutorialkit, the pots,switches and microphone all work, I get to hear Paul's voice telling me the knobs and switches, buttons are registering and the example wav file begins to play, after about 10 seconds there is a loud buzz and the Teensy and demo no longer respond to the buttons to stop, reloading software allows all the basic hardware to function except playing the wav file from the sdcard. (Paul's voice tells me that there is no sdcard). It appears to be time/heat related as if I wait some minutes before retrying I can get some sound from the Sdcard before it quits again. As additional info, the SPI flash chip shows a similar intermittent issue using the examples under SPIFlash for writing, reading and erasing such that it sometimes works well and other times complains about not being able to access the SPIFlash chip. All other hardware for playing samples in the tutorial seem to work, which seems to implicate the SPI part of the circuitry on the audio shield, as the external SDCard has never shown any indication of not working. Possibly it is the Teensy3.2 but it's hard to say conclusively which is as fault.
Any suggestions would be welcome.