block_atsamx70_pwm.c 4.96 KB
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/*
	Copyright Jeroen Vreeken (jeroen@vreeken.net), 2018

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

#include <samx70.h>
#include <pwm.h>
#include <pio/samx70.h>
#include <ioport.h>

#include <controller/controller_block.h>
#include <log/log.h>


struct controller_block_private {
	float *in;
	
	int period;
	uint32_t pwm;
	int ch_nr;
	uint32_t outputh;
	uint32_t outputl;
};

static void pwm_calculate(struct controller_block *pwm)
{
	struct controller_block_private *priv = pwm->private;
	uint32_t pw = priv->pwm;
	float in = *priv->in;
	int period = priv->period;
	uint32_t outputl = priv->outputl;
	uint32_t outputh = priv->outputh;
	int ch_nr = priv->ch_nr;
	
	int duty = in * period;

	uint32_t dty = abs(duty);
	/* Make sure we generate negative pulses for capacitor loading */
	if (dty >= period) {
		dty--;
	}
	
	if (duty > 0) {
		pwm_output_selection_set(pw, outputl);
		pwm_channel_duty_cycle_update_set(pw, ch_nr, dty);
		pwm_output_selection_clear_update(pw, outputh);
	} else if (duty < 0) {
		pwm_output_selection_set(pw, outputh);
		pwm_channel_duty_cycle_update_set(pw, ch_nr, dty);
		pwm_output_selection_clear_update(pw, outputl);
	} else {
		pwm_output_selection_set(pw, outputh | outputl);
		pwm_channel_duty_cycle_update_set(pw, ch_nr, dty);
	}
	
	pwm_sync_update(pw);
}


static struct controller_block_interm_list interms[] = {
	{ "in", CONTROLLER_BLOCK_TERM_FLOAT, offsetof(struct controller_block_private, in) },
	{ NULL },
};



static struct controller_block * block_atsamx70_pwm_create(char *name, int argc, va_list ap)
{
	struct controller_block *pwm;
	int pwm_nr;
	int ch_nr;

	double frequency;
	
	pwm_nr = va_arg(ap, int);
	if (pwm_nr < 0 || pwm_nr > 1) {
		log_send(LOG_T_ERROR, "%s: pwm%d is not valid. (valid: 0-1)",
		    name, pwm_nr);
		return NULL;
	}

	ch_nr = va_arg(ap, int);
	if (ch_nr < 0 || ch_nr > 1) {
		log_send(LOG_T_ERROR, "%s: channel %d is not valid. (valid: 0-3)",
		    name, ch_nr);
		return NULL;
	}
	
	double fclock = sysclk_get_peripheral_hz();
	
	frequency = va_arg(ap, double);
	int period = fclock / frequency;
	
	log_send(LOG_T_DEBUG, "%s: Frequency: %fHz, period: %d (%fHz)", name, 
	    frequency, period, fclock / period);

	if (!(pwm = controller_block_alloc("atsamx70_pwm", name, sizeof(struct controller_block_private))))
		goto err_alloc;

	if (controller_block_interm_list_init(pwm, interms))
		goto err_interm;

	pwm->calculate = pwm_calculate;
	
	pwm->private->ch_nr = ch_nr;
	pwm->private->period = period;
	
	switch (pwm_nr) {
		case 0:
			pwm->private->pwm = PWM0;
			break;
		case 1:
			pwm->private->pwm = PWM1;
			break;
	}
	
	pwm_init(pwm->private->pwm);
	pwm_disable(pwm->private->pwm, ch_nr);

	uint32_t oov = pwm_output_override_get(pwm->private->pwm);
	switch (ch_nr) {
		case 0:
			oov &= ~(PWM_OOV_OOVL0 | PWM_OOV_OOVH0);
			pwm->private->outputh = PWM_OS_OSL0;
			pwm->private->outputl = PWM_OS_OSH0;
			ioport_disable_pin(PIO_PD20_IDX);
			ioport_set_pin_mode(PIO_PD20_IDX, IOPORT_MODE_MUX_A);
			ioport_set_pin_dir(PIO_PD20_IDX, IOPORT_DIR_OUTPUT);
			ioport_disable_pin(PIO_PA19_IDX);
			ioport_set_pin_mode(PIO_PA19_IDX, IOPORT_MODE_MUX_B);
			ioport_set_pin_dir(PIO_PA19_IDX, IOPORT_DIR_OUTPUT);
			break;
		case 1:
			oov &= ~(PWM_OOV_OOVL1 | PWM_OOV_OOVH1);
			pwm->private->outputh = PWM_OS_OSL1;
			pwm->private->outputl = PWM_OS_OSH1;
			break;
		case 2:
			oov &= ~(PWM_OOV_OOVL2 | PWM_OOV_OOVH2);
			pwm->private->outputh = PWM_OS_OSL0;
			pwm->private->outputl = PWM_OS_OSH2;
			break;
		case 3:
			oov &= ~(PWM_OOV_OOVL3 | PWM_OOV_OOVH3);
			pwm->private->outputh = PWM_OS_OSL3;
			pwm->private->outputl = PWM_OS_OSH3;
			break;
	}
	
	pwm_output_override_set(pwm->private->pwm, oov);
	pwm_output_selection_set_update(pwm->private->pwm, pwm->private->outputh | pwm->private->outputl);

	pwm_sync_mode_set(pwm->private->pwm, 
	    PWM_SCM_SYNC0 | PWM_SCM_SYNC1 | PWM_SCM_SYNC2 | PWM_SCM_SYNC3);

	pwm_channel_mode_set(pwm->private->pwm, ch_nr, PWM_CMR_CPOL | PWM_CMR_DPOLI | PWM_CMR_DTLI);

	pwm_channel_period_set(pwm->private->pwm, ch_nr, period);
	pwm_channel_duty_cycle_update_set(pwm->private->pwm, ch_nr, 0);
	pwm_channel_dead_time_set(pwm->private->pwm, ch_nr, 0);
	
	pwm_sync_update(pwm->private->pwm);
	pwm_enable(pwm->private->pwm, ch_nr);

	if (controller_block_add(pwm))
		goto err_add;
	return pwm;

err_add:
err_interm:
	controller_block_free(pwm);
err_alloc:
	return NULL;
}

BLOCK_CREATE(atsamx70_pwm) = {
	.create = block_atsamx70_pwm_create,
	.args = { "int,int,double", NULL },
};