AVR Freaks

I thought that was being accomplished by the following line:

CLKCTRL.MCLKCTRLA |= (1 << CLKCTRL_CLKOUT_bp);   // Set CLKOUT pin as output

But as it is not, I'm removing it!

Also, in step 3 I cannot find any register CTRLC in PORTMUX... Can you check that, please?

And I do not understand Step 4.

"The direction for the associated port pin n..." <-- What associated port? What pin?

Ok, this is what I tried but still can't see the waveform in PA0.

/* 
 * File:   LedBlink.c
 * Author: PsySc0rpi0n
 *
 * Created on 20 de Fevereiro de 2019, 21:35
 */
#define F_CPU 20000000UL

#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <avr/io.h>
#include <util/delay.h>

/*
 * 
 */

int main(int argc, char** argv) { 
    //http://ww1.microchip.com/downloads/en/DeviceDoc/40002015A.pdf
    
    // Main Clock Configuration
    // page 84
    CLKCTRL_MCLKCTRLA &= ~CLKCTRL_CLKSEL_OSC20M_gc; // Select 20MHz Internal Oscillator
    // page 85
    CLKCTRL_MCLKCTRLB &= ~CLKCTRL_PEN_bp;           // Disable Prescaler
    
    
    // page 
    TCA0_SINGLE_CMP0 = 0x07cf;                                     // TOP --> 5000Hz = (20e6/6)/(2*1(CMPn + 1)) <=> CMPn = 1999
    
    //http://ww1.microchip.com/downloads/en/DeviceDoc/40002015A.pdf, page 190, 208, 
    TCA0_SINGLE_CTRLB |= (1 << 0);                                 // Wave Generation Mode --> FRQ
    TCA0_SINGLE_EVCTRL &= ~( (1 << 2) | (1 << 1) | (1 << 0));      // Incremental Ticks counting mode (Positive edge) - No events counting
    TCA0_SINGLE_CTRLB |= TCA_SINGLE_CMP0EN_bp;                     // Compare channels enabled
    PORTMUX.TCAROUTEA &= ~PORTMUX_TCA0_gm;                         // Set PA[0:5] as output for the wave form
    PORTA_OUT |= (1 << PIN0_bp);                                   // Set PIN0 of PORTA as output to see waveform
    for ( ; ;){

    }
    return (EXIT_SUCCESS);
}

If I translate this to the bare bits and shift operations, the macros in these 2 lines would be:

TCA0_SINGLE_CTRLB |= TCA_SINGLE_CMP0EN_bp;

knowing by the header file iom4808.h that

TCA0_SINGLE_CMP0EN_bp

translates to a simple 4, the above complete line would translate to:

TCA0_SINGLE_CTRLB = TCA0_SINGLE_CTRLB | 4;

So I don't see a problem here.

For the 2nd line:

PORTA_OUT |= (1 << PIN0_bp);

knowing from the header file ion4808.h that

PIN0_bp

translates to a simple 0 (zero), the above complete line would translate to:

PORTA_OUT = PORTA_OUT | (1 << 0);

This would be setting pin 0 of register PORTA_OUT to 1, or output. I don't see a problem here too!

What am I missing?

----------

And I tried to change things to this, but still no success yet. I can't see any waveform at pin PA0 of this AVR IoT WG board.

/* 
 * File:   LedBlink.c
 * Author: PsySc0rpi0n
 *
 * Created on 20 de Fevereiro de 2019, 21:35
 */
#define F_CPU 20000000UL

#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <avr/io.h>
#include <util/delay.h>

/*
 * 
 */

int main(int argc, char** argv) { 
    //http://ww1.microchip.com/downloads/en/DeviceDoc/40002015A.pdf
    
    // Main Clock Configuration
    // page 84
    CLKCTRL_MCLKCTRLA = ~CLKCTRL_CLKSEL_OSC20M_gc; // Select 20MHz Internal Oscillator
    // page 85
    CLKCTRL_MCLKCTRLB = ~CLKCTRL_PEN_bp;           // Disable Prescaler
    
    
    // page 
    TCA0_SINGLE_CMP0 = 0x07cf;                                     // TOP --> 5000Hz = (20e6/6)/(2*1(CMPn + 1)) <=> CMPn = 1999
    
    //http://ww1.microchip.com/downloads/en/DeviceDoc/40002015A.pdf, page 190, 208, 
    TCA0_SINGLE_CTRLB |= (1 << 0);                                 // Wave Generation Mode --> FRQ
    TCA0_SINGLE_EVCTRL &= ~( (1 << 2) | (1 << 1) | (1 << 0));      // Incremental Ticks counting mode (Positive edge) - No events counting
    TCA0_SINGLE_CTRLB |= (1 << TCA_SINGLE_CMP0EN_bp);                      // Compare channels enabled
    PORTMUX_TCAROUTEA &= ~PORTMUX_TCA00_bm;                          // Set PA[0:5] as output for the wave form
    PORTA_OUT |= (1 << PIN0_bp);                                    // Set PIN0 of PORTA as output to see waveform
    
    for ( ; ;){

    }
    return (EXIT_SUCCESS);
}

I know about that and it's probably that that is generating confusion to me.

I even tried to remove all those MACROS and use the notation I'm more used to but still no good:

/* 
 * File:   LedBlink.c
 * Author: PsySc0rpi0n
 *
 * Created on 20 de Fevereiro de 2019, 21:35
 */
#define F_CPU 20000000UL

#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <avr/io.h>
#include <util/delay.h>

/*
 * 
 */

int main(int argc, char** argv) { 
    //http://ww1.microchip.com/downloads/en/DeviceDoc/40002015A.pdf
    
    // Main Clock Configuration
    // page 84
    //CLKCTRL_MCLKCTRLA |= CLKCTRL_CLKSEL_OSC20M_gc;                  // Select 20MHz Internal Oscillator
    CLKCTRL_MCLKCTRLA &= ~((1 << 0x01) | (1 << 0x00));
    
    // page 85
    //CLKCTRL_MCLKCTRLB &= ~(1 << CLKCTRL_PEN_bp);                    // Disable Prescaler
    CLKCTRL_MCLKCTRLB &= ~(1 << 0x00);
    
    // page ??
    TCA0_SINGLE_CMP0 = 0x07cf;                                      // TOP --> 5000Hz = (20e6/6)/(2*1(CMPn + 1)) <=> CMPn = 1999
    
    //http://ww1.microchip.com/downloads/en/DeviceDoc/40002015A.pdf, page 190, 208, 
    TCA0_SINGLE_CTRLB |= (1 << 0);                                  // Wave Generation Mode --> FRQ
    TCA0_SINGLE_EVCTRL &= ~( (1 << 2) | (1 << 1) | (1 << 0));       // Incremental Ticks counting mode (Positive edge) - No events counting
    
    //TCA0_SINGLE_CTRLB |= (1 << TCA_SINGLE_CMP0EN_bp);               // Compare channels enabled
    TCA0_SINGLE_CTRLB |= (1 << 0x01);
    
    //PORTMUX_TCAROUTEA &= ~PORTMUX_TCA00_bm;                         // Set PA[0:5] as output for the wave form
    PORTMUX_TCAROUTEA &= ~((1 << 0x02) | (1 << 0x01) | (1 << 0x00));
    
    PORTA_OUT |= (1 << 0x00);                                    // Set PIN0 of PORTA as output to see waveform
    
    for ( ; ;){

    }
    return (EXIT_SUCCESS);
}

Finally I made it thanks to @El Tangas link above and Moe123 links.

Here is the code I used:

#include <stdio.h>
#include <stdlib.h>
#include <avr/io.h>

/*
 * 
 */

void Clock_Init(void){
    // Main Clock Configuration
    
    CPU_CCP = CCP_IOREG_gc;
    // Select 20MHz Internal Oscillator
    CLKCTRL_MCLKCTRLA = CLKCTRL_CLKSEL_OSC20M_gc;
    
    CPU_CCP = CCP_IOREG_gc;
    // Disable Prescaler
    CLKCTRL_MCLKCTRLB = ~CLKCTRL_PEN_bm;
    
    while(CLKCTRL_MCLKSTATUS & CLKCTRL_SOSC_bm);
}
void Port_Init(void){
    PORTA_DIR |= PIN0_bm;
}
void TimerA_Init(void){
    // Set PA[0:5] as output for the wave form
    PORTMUX_TCAROUTEA =  PORTMUX_TCA0_PORTA_gc;
    
    //Frequency Mode and Compare Channels enabled
    TCA0_SINGLE_CTRLB = TCA_SINGLE_WGMODE_FRQ_gc | TCA_SINGLE_CMP0EN_bm;
    
    //Disable Event count. Ticks counter instead
    TCA0_SINGLE_CTRLA &= ~(TCA_SINGLE_CNTEI_bm);
    
    // TOP --> 5000Hz = (20e6/6)/(2*1(CMPn + 1)) <=> CMPn = 1999
    TCA0_SINGLE_CMP0 = 0x07cf;
    
    //Select DIV1 for Timer prescaler and Enable peripheral
    TCA0_SINGLE_CTRLA =  (TCA_SINGLE_CLKSEL_DIV1_gc | TCA_SINGLE_ENABLE_bm); 
}

int main(int argc, char** argv) { 
    //http://ww1.microchip.com/downloads/en/DeviceDoc/40002015A.pdf
    
    Clock_Init();
    Port_Init();
    TimerA_Init();
    
    for ( ; ;){

    }
    return (EXIT_SUCCESS);
}

This is what I get in the scope

Nevermind... Noob mistake!

It should be

TCA0_SINGLE_CTRLB &= ~( (1 << 0x02) | (1 << 0x01));
TCA0_SINGLE_CTRLB |= ((1 << 0x04) | (1 << 0x00));

instead.

Thanks.

I'll use that notation...