HardwareSerial slower in 0.0.12

(2 posts) (1 voice)

Xavier
Moderator

Hello,

I'm trying to switch from 0.0.11 to 0.0.12 for my sound module because it seems to have a more stable i2c to communicate with 24lc512 EEPROM.

Everything compiles fine after modifying a few usb names in the link process.

But Serial3.print(char) (used to transmit midi information) seems to be much slower...
I really get audio dropout each time a call it... Everything is fine when i shortcut these calls. And it worked perfectly with 0.0.11.

I use Serial3 which is initialized using :
Serial3.begin(31250);

Any change that could have cause this ?

Thanks,

Xaiver

Posted 4 years ago #
Xavier
Moderator

Update :
Regarding the I2C instability of 0.0.11 i copied from v0.0.12 the "dispatch" modification of file timer.c and now i can read thousands of times in a row my data from the EEPROM.
Seems like "timer compare irq" and i2c_transfer does not work well together in 0.0.11.

I still have no idea why Serial3.print(char) is slower in v0.0.12. But i don't need 0.0.12 anymore.

Cheers,

Xavier

Posted 4 years ago #

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