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Friday, November 11, 2011

Increase speed on Pinguino32 !!

Default peripheral speed on Pinguino is programmed to 10 Mhz. For some application, we need to increase this speed ( 10 MIPS is less than a Pinguino 8 bits ). To achieve this, we must use the system library which is located in the /p32/include/pinguino/basics folder ).
The peripheral speed is derived from the system clock speed wich is 80 MHZ on Pinguino 32. You can select a peripheral speed with the SetPeripheralClock(divider) function. Divider should be chosen in the predefined value.
PBDIV8 use a 10 Mhz peripheral speed ( default value in Pinguino ).
PBDIV4 -> 20 Mhz
PBDIV2 -> 40 Mhz
PBDIV1 -> 80 Mhz

As an example, we propose this small program:

// increasing peripheral speed on Pinguino32
// Jean-Pierre Mandon 2011

void setup()
{
SetPeripheralClock(PBDIV1);
Serial.begin(9600);
}

void loop()
{
Serial.printf("System clock=%d\n\r",GetSystemClock());
Serial.printf("Peripheral clock=%d\n\r",GetPeripheralClock());
delay(500);
}

SetPeripheralClock must be the first instruction in the setup() because peripheral speed is used to configure Serial, delay and SPI.

Now your Pinguino32 is a real 32 bits/80 MIPS computer !!

4 comments:

Anonymous said...

Yeaaa!!! More Speed!
Best Rgs,
Alejandro from Argentina

Fırat Dede said...

Hi,

Why did you use "Serial.printf" function? Is it attached to some device?

Thanks,
Firat Dede

Jean-Pierre MANDON said...

Hi,

Serial.printf is attached to UART1 and can be used to print formatted string.

JP

Anonymous said...

Isn't this worth some space/page on the official Pinguino forum or website ?