Configurable custom logic - ATTINY 1614

[dave2fn]

Hey Folks, Been stuck for few days on this and hoping someone in the community can help unstuck me.

Trying to learn about CCL and found this article https://hackaday.io/project/165881-attiny-1-series-with-arduino-support/log/171606-using-configurable-custom-logic-ccl-in-arduino-on-the-attiny1616. Tried to replicate this and can't get LED to blink the way shown in the article. Ensured clock is set to 20MHz(Tools > Clock > 20MHz Internal) and did a "Burn Bootloader" before uploading sketch.

Any help to get this working would be appreciated.

Below is my sketch.

#include <avr/sleep.h>

void TCB0_init(void)
{
  TCB0.CTRLA = TCB_CLKSEL_CLKDIV2_gc  /* CLK_PER/2 (From Prescaler) */
  | 1 << TCB_ENABLE_bp;               /* Enable: enabled */

  TCB0.CTRLB =  1 << TCB_CCMPEN_bp    /* Pin Output Enable: enabled */
  | TCB_CNTMODE_PWM8_gc;              /* 8-bit PWM */

  TCB0.CCMP = 0x28FF;                 /* 8-bit mode. Period = 255 (0xff), cmp = 40 (0x28) */
}

void init_IO_pins(void) {
	
	/*
	 * Set all IO pins as input with pull-up enabled and 
	 * digital input buffer disabled to minimize power consumption 
	 */ 
	
	PORTA.DIR = 0x00;
	PORTB.DIR = 0x00;

	uint8_t PORT_pin_settings = PORT_PULLUPEN_bm | PORT_ISC_INPUT_DISABLE_gc;
	
	for (uint8_t i = 0; i < 8; i++) {
		*((uint8_t *)&PORTA + 0x10 + i) = PORT_pin_settings;
		*((uint8_t *)&PORTB + 0x10 + i) = PORT_pin_settings;
	}
	
	PORTA.DIRSET	= PIN7_bm;				//Set PB7 as output (LED pin) 
	PORTA.PIN7CTRL	= PORT_INVEN_bm;		//Invert output on PB7 as LED is active low / low side driven	
}

void TCD0_init(void)
{
  TCD0.CTRLB = 0x00;                  /* Disable Dual slope mode */
 
  TCD0.CMPASET = 2536;                /* Compare A Set: 2536 */
  TCD0.CMPACLR = 2760;                /* Compare A Clear: 2760 */
  TCD0.CMPBSET = 3277;                /* Compare B Set: 3277 */
  TCD0.CMPBCLR = 4092;                /* Compare B Clear: 4092 */

  while ((TCD0.STATUS & TCD_ENRDY_bm) == 0); /* Wait for Enable Ready to be high */

  TCD0.CTRLA = 1 << TCD_ENABLE_bp     /* Enable: enabled */
  | TCD_CNTPRES_DIV4_gc;              /* Sync clock divided by 4 */
}

void CCL_init(void)
{    
  CCL.LUT1CTRLB = CCL_INSEL0_TCD0_gc  /* TCD0 WOA input source */
  | CCL_INSEL1_TCD0_gc                /* TCD0 WOB input source */;
    
  CCL.LUT1CTRLC = CCL_INSEL2_TCB0_gc  /* TCB0 WO input source */;

  CCL.TRUTH1 = 0x9F;                  /* Truth 0: 0x9F */
    
  CCL.LUT1CTRLA = 1 << CCL_ENABLE_bp  /* LUT Enable: enabled */
  | 1 << CCL_OUTEN_bp;                /* Output Enable: enabled */

  CCL.CTRLA = 1 << CCL_ENABLE_bp      /* Enable: enabled */
  | 0 << CCL_RUNSTDBY_bp;             /* Run in Standby: disabled */
}

void setup()
{
  init_IO_pins();

  _PROTECTED_WRITE(CLKCTRL_MCLKCTRLB, (CLKCTRL_PDIV_32X_gc | CLKCTRL_PEN_bm));  /* Slow down the main clock to 20MHz/32 = 625kHz */

  TCB0_init();
  TCD0_init();
  CCL_init();
}
 
void loop() {
    /* Nothing to do here */
}

[RAnalog]

I loaded your program unchanged into an ATTiny1616, using an AVRICE programmer (not Arduino) - just to try it. Works fine unmodified. Are you connecting the LED to PA7 through a resistor to GND?

[dave2fn]

Problem was not setting takeOverTCD0(); . Once I did that it started working. Below is the working program using megaTinyCore

#include <avr/sleep.h>

void TCB0_init(void)
{
  TCB0.CTRLA = TCB_CLKSEL_CLKDIV2_gc  /* CLK_PER/2 (From Prescaler) */
  | 1 << TCB_ENABLE_bp;               /* Enable: enabled */

  TCB0.CTRLB =  1 << TCB_CCMPEN_bp    /* Pin Output Enable: enabled */
  | TCB_CNTMODE_PWM8_gc;              /* 8-bit PWM */

  TCB0.CCMP = 0x28FF;                 /* 8-bit mode. Period = 255 (0xff), cmp = 40 (0x28) */
}

void init_IO_pins(void) {
	
	/*
	 * Set all IO pins as input with pull-up enabled and 
	 * digital input buffer disabled to minimize power consumption 
	 */ 
	
	PORTA.DIR = 0x00;
	PORTB.DIR = 0x00;

	uint8_t PORT_pin_settings = PORT_PULLUPEN_bm | PORT_ISC_INPUT_DISABLE_gc;
	
	for (uint8_t i = 0; i < 8; i++) {
		*((uint8_t *)&PORTB + 0x10 + i) = PORT_pin_settings;
                *((uint8_t *)&PORTA + 0x10 + i) = PORT_pin_settings;
	}
}

void TCD0_init(void)
{
  takeOverTCD0();

  TCD0.CTRLB = 0x00;                  /* Disable Dual slope mode */
 
  TCD0.CMPASET = 2536;                /* Compare A Set: 2536 */
  TCD0.CMPACLR = 2760;                /* Compare A Clear: 2760 */
  TCD0.CMPBSET = 3277;                /* Compare B Set: 3277 */
  TCD0.CMPBCLR = 4092;                /* Compare B Clear: 4092 */

  while ((TCD0.STATUS & TCD_ENRDY_bm) == 0); /* Wait for Enable Ready to be high */

  TCD0.CTRLA = 1 << TCD_ENABLE_bp     /* Enable: enabled */
  | TCD_CNTPRES_DIV4_gc;              /* Sync clock divided by 4 */
}

void CCL_init(void)
{    
  CCL.LUT1CTRLB = CCL_INSEL0_TCD0_gc  /* TCD0 WOA input source */
  | CCL_INSEL1_TCD0_gc                /* TCD0 WOB input source */;
    
  CCL.LUT1CTRLC = CCL_INSEL2_TCB0_gc  /* TCB0 WO input source */;

  CCL.TRUTH1 = 0x9F;                  /* Truth 0: 0x9F */
    
  CCL.LUT1CTRLA = 1 << CCL_ENABLE_bp  /* LUT Enable: enabled */
  | 1 << CCL_OUTEN_bp;                /* Output Enable: enabled */

  CCL.CTRLA = 1 << CCL_ENABLE_bp      /* Enable: enabled */
  | 0 << CCL_RUNSTDBY_bp;             /* Run in Standby: disabled */
}

void setup()
{
  init_IO_pins();

  _PROTECTED_WRITE(CLKCTRL_MCLKCTRLB, (CLKCTRL_PDIV_32X_gc | CLKCTRL_PEN_bm));  /* Slow down the main clock to 20MHz/32 = 625kHz */
//    _PROTECTED_WRITE(CLKCTRL_MCLKCTRLA, CLKCTRL_CLKSEL_OSCULP32K_gc);  /* Slow down the main clock to 20MHz/32 = 625kHz */

  TCB0_init();
  TCD0_init();
  CCL_init();
  set_sleep_mode(SLEEP_MODE_IDLE);
  sleep_enable();
  interrupts();
}
 
void loop() {
   sleep_cpu();
}