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Prescaler support #9

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Prescaler support #9

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@astrand astrand commented May 29, 2020

Atlantis-Specialist-Technologies/CAN485#7 can be used to select a lower frequency in the IDE. Application code example:

void setup() {
    if(F_CPU == 8000000) clock_prescale_set(clock_div_2);
    canInit(500000);           
    Serial.begin(115200);
}

@astrand
can_init: Re-order baud cases, to follow Atmel data sheet
678c495 
Also added TQ value, which documents the alternative used.
@astrand
can_init: Add baud rate settings for all clock speeds
7d1198d 
According to table "Examples of CAN Baud Rate Settings for Commonly
Frequencies" from data sheet.
@astrand
can_init: Remove clock prescaler reset
08d6f4c 
We now have proper support for multiple frequencies.
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