ATmega4809 won't respond

[Simon]

I wrote a program for a project with an atmega3208 an got absolutely nothing out. So I started to play with the dev board with a 4809 on it. I wrote the below simplest of programs but other than clock out I get nothing other that some pins permanently low or high:

Code: [Select]

int main(void)
{

CCP = 0xD8;
CLKCTRL.MCLKCTRLA = 0b10000000;
PORTA.DIRSET = 0xFF;
PORTB.DIRSET = 0xFF;
PORTC.DIRSET = 0xFF;
PORTD.DIRSET = 0xFF;
PORTE.DIRSET = 0xFF;
PORTF.DIRSET = 0xFF;


while(1){
PORTA.OUTSET = 0xFF;
PORTB.OUTSET = 0xFF;
PORTC.OUTSET = 0xFF;
PORTD.OUTSET = 0xFF;
PORTE.OUTSET = 0xFF;
PORTF.OUTSET = 0xFF;

PORTA.OUTCLR = 0xFF; 
PORTB.OUTCLR = 0xFF;
PORTC.OUTCLR = 0xFF;
PORTD.OUTCLR = 0xFF;
PORTE.OUTCLR = 0xFF;
PORTF.OUTCLR = 0xFF;
}

}


[Simon]

now working, I did nothing, very strange.

[westfw]

I have (using MPLAB-X):

Code: [Select]

#define F_CPU (20000000/6)
 #include <xc.h>
 #include <util/delay.h>

void  __attribute__((noinline)) mydelay();
void mydelay() {
   _delay_ms(1000);
}

void main(void) {
    VPORTA.DIR |= 1<<7;
    while (1) {
        mydelay();
        VPORTA.IN |= 1<<7;
    }
    return;
}
Which works fine, even on my home-built hardware...

[cv007]

VPORTA.IN |= 1<<7;

Looked odd to me.
I totally missed that in the datasheet (even though I know I read it).
Glad you posted that code

datasheet-
Writing to a bit of VPORTx.IN will toggle the corresponding bit in VPORTx.OUT.
There is the missing VPORT TGL.

[westfw]

Writing to a bit of VPORTx.IN will toggle the corresponding bit in VPORTx.OUT.

The VPORT registers (DIR, OUT, IN) are essentially compatible with the DDR/PORT/PIN registers of the older ATmega chips.  (A good move on their part, IMO.)  (Writing 1 to the PINx register of an ATmega328 (for example) will also toggle the output.  "very old" ATmega chips (like ATmega8) do not have this feature.)

[cv007]

I was using OUTTGL for my tog() function, as I somehow equated no TGL register in VPORT to mean in wasn't there. I haven't touched an avr in a long time (mega88/168/etc), but do remember the PIN toggle.

https://github.com/cv007/ATTiny416XplainedNano/blob/master/Port.hpp

Now I feel better as it matches the rest of the pin functions, and I can save a few bytes every time I toggle an led (seems to be the only time I use toggle).

For really nice bit setting/clearing, the pic32 (I use the mm) is nice to use where almost every register is capable of set/clr/inv (every register is 32bits, and there are 4 for each).