Hi Seb,
On 2011/03/24 21:40, Sebastien Lelong wrote:
Some more feedback. I'm running this chip using a 16MHz crystal. I took
your sample, modified 20_000_000 to 16_000_000, matching my Xtal speed.
Indeed, LED is blinking, but not at proper rate (compared visually with
jaluino medium, which I know working good). Fuses are exactly the same,
PLLDIV/CPUDIV disabled, etc... Actually, it's as though it was running
twice faster: if I specify 8_000_000, it seems to blink properly.
I happen to have a testboard for 28-pins PICs and 16 MHz resonator.
You are right: the led is blinking at 1 Hz, not at 2 Hz as it is
supposed to do. Reason: wrong CPUDIV, should be:
pragma target CPUDIV P1 -- no cycle divisor
With this the LED blinks at 2 Hz.
I must have overlooked the slow blinking frequency!
I'll have to check if this is true for other PICs with CPUDIV and I may
have to adapt the samples.
Some more test using serial: specifying 16MHz just gives garbage chars.
Specifying 8MHz, receiving chars works good, but sending chars doesn't
work !
I've taken the sample 18f2450_serial_hw_int_cts.jal, modified the PIC of
the include to 18f27j53, set the clock to 16 MHz and adapted config
bits settings to what the 18f27j53 supports.
It runs fine (at 115200 bps), both input and output are OK.
I also tested with the internal oscillator at 4 and 8 MHz and with
serial speeds of 2400 and 9600 bps: no problem!
Regards, Rob.
--
R. Hamerling, Netherlands --- http://www.robh.nl
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