Blinking an LED with PIC18F46K80

[washburn96]

I'm currently having some trouble trying to blink an LED, connected to pin RC0, on a PIC18F46K80. I'm currently trying to migrate from CCS to mikroC PRO and, since CCS always hides what's actually going on underneath your code, I might have developed some bad habits and now I have no idea on why this doesn't work. These are my goals:

- Use the internal RC oscillator to provide Fosc = 64MHz
- Turn on pin RC0 on PORTC
- Wait 500ms
- Turn off pin RC0
- Wait another 500ms.

This is my code:

Code: Select all

void main() {

     PORTC = 0x00;
     LATC = 0x00;
     TRISC.RC0 = 0;
     
     
     while(1){
              LATC.B0 = 1;
              Delay_ms(500);
              LATC.B0 = 0;
              Delay_ms(500);
     }

}

My configuration bits are the following:

MCU Clock Frequency: 64MHz
VREG Sleep: Disabled
LF-INTOSC Low Power: High Power
SOSC Power Selection and Mode: High Power
Extended Instruction Set: Enabled
Oscillator: Internal RC Oscillator
PLL x4: Enabled
FSCM: Disabled
IESO: Disabled
PUT: Enabled
BOR: Enabled in Hardware, SBOREN disabled
BOR Voltage: 1.8V
BOR Power Level: ZPBORMV instead of BORMV is selected
WDT: WDT disabled in hardware; SWDTEN bit disabled
WDT Postscaler: 1:1048576
ECAN Mux: TX and RX on RB2 and RB3
MSSP Address Masking: 7 bit
MCLR: Enabled
Stack Overflow Reset: Disabled
Boot Block Size: 2K
Background Debug: Disabled

Circuit schematic: https://prnt.sc/oE1e9MuxkXpZ

[VU_NAS]

I don't think this mcu can run at 64MHz via its internal PLL oscillator.

[paulfjujo]

Hello,


config bits !

Internal Oscillator !
• INTIO2 Internal Oscillator with I/O on RA6 and RA7
and
For the INTIOx modes (HF-INTOSC):
• Only the PLLEN can enable the PLL (PLLCFG is ignored).
bit PLLEN in OSCTUNE register

[washburn96]

I don't think this mcu can run at 64MHz via its internal PLL oscillator.

Yes, it can. It has an internal RC oscillator with 16Mhz output, that can be multiplexed to a 4x PLL. I had it running like that with my code compiled in CCS PIC compiler

[washburn96]

Hello,

did you disable Analog PORTC input ?
Most of new MCU , have inputs in Analog mode at reset or power ON ...

show us your code ..!
and config bits !

There are no analog functions multiplexed to PORTC in this MCU. If my LED was connected to a pin in PORTA, it would be another story.

[paulfjujo]

hello,


Except off Oscillator problem, i didn't see somewhat wrong ,
or interference with Secondary Oscillator SOSCO or SCLKI forced RC0 as input ?
SOSC Power Selection and Mode: High Power <- i don't know what does this exactly ..
capacitor on VCAP ?

i don't have your type of MCU to do this test
but i compiled the project ..
maybe you can upload this *.hex into your PIC and see if different behavior ...

TEST_18F46K80.zip

(48.1 KiB) Downloaded 47 times

[hexreader]

I do own a PIC18F46K80

The attached project works for me...

EDIT: - oops, mistakenly read LED on RB0 instead of RC0. Luckily example toggles both pins