4  * SPDX-License-Identifier: Apache-2.0
10 #include <zephyr/drivers/pwm.h>
11 #include <zephyr/dt-bindings/gpio/gpio.h>
30 	     "Only clock-prescaler = <0> is supported when used with RTC");
39 /* One compare channel is needed to set the PWM period, hence +1. */
41 #error "Invalid number of PWM channels configured."
82 	return config->rtc;  in pwm_config_rtc()
91 	return config->timer;  in pwm_config_timer()
103 	/* allow 0% and 100% duty cycle, as it does not use PWM. */  in pwm_period_check()
111 		    (data->pulse_cycles[i] != 0U) &&  in pwm_period_check()
112 		    (period_cycles != data->period_cycles)) {  in pwm_period_check()
113 			return -EINVAL;  in pwm_period_check()
124 	const struct pwm_config *config = dev->config;  in pwm_nrf_sw_set_cycles()
128 	struct pwm_data *data = dev->data;  in pwm_nrf_sw_set_cycles()
136 	if (channel >= config->map_size) {  in pwm_nrf_sw_set_cycles()
138 		return -EINVAL;  in pwm_nrf_sw_set_cycles()
144 	ret = pwm_period_check(data, config->map_size, channel, period_cycles,  in pwm_nrf_sw_set_cycles()
152 		/* pulse_cycles - 1 is written to 24-bit CC */  in pwm_nrf_sw_set_cycles()
155 			return -EINVAL;  in pwm_nrf_sw_set_cycles()
160 			LOG_ERR("Too long period (%u), adjust PWM prescaler!",  in pwm_nrf_sw_set_cycles()
162 			return -EINVAL;  in pwm_nrf_sw_set_cycles()
166 	gpiote = config->gpiote[channel].p_reg;  in pwm_nrf_sw_set_cycles()
167 	psel_ch = config->psel_ch[channel];  in pwm_nrf_sw_set_cycles()
168 	gpiote_ch = data->gpiote_ch[channel];  in pwm_nrf_sw_set_cycles()
169 	ppi_chs = data->ppi_ch[channel];  in pwm_nrf_sw_set_cycles()
183 	 * the PWM signal, just	keep the output pin in inactive or active  in pwm_nrf_sw_set_cycles()
194 		/* No PWM generation for this channel. */  in pwm_nrf_sw_set_cycles()
195 		data->pulse_cycles[channel] = 0U;  in pwm_nrf_sw_set_cycles()
197 		/* Check if PWM signal is generated on any channel. */  in pwm_nrf_sw_set_cycles()
198 		for (uint8_t i = 0; i < config->map_size; i++) {  in pwm_nrf_sw_set_cycles()
199 			if (data->pulse_cycles[i]) {  in pwm_nrf_sw_set_cycles()
204 		/* No PWM generation needed, stop the timer. */  in pwm_nrf_sw_set_cycles()
222 		 * '- 1' adjusts pulse and period cycles to the fact that CLEAR  in pwm_nrf_sw_set_cycles()
226 		nrf_rtc_cc_set(rtc, 1 + channel, pulse_cycles - 1);  in pwm_nrf_sw_set_cycles()
227 		nrf_rtc_cc_set(rtc, 0, period_cycles - 1);  in pwm_nrf_sw_set_cycles()
240 	/* Configure GPIOTE - toggle task with proper initial output value. */  in pwm_nrf_sw_set_cycles()
241 	gpiote->CONFIG[gpiote_ch] =  in pwm_nrf_sw_set_cycles()
302 	/* start timer, hence PWM */  in pwm_nrf_sw_set_cycles()
310 	data->period_cycles = period_cycles;  in pwm_nrf_sw_set_cycles()
311 	data->pulse_cycles[channel] = pulse_cycles;  in pwm_nrf_sw_set_cycles()
319 	const struct pwm_config *config = dev->config;  in pwm_nrf_sw_get_cycles_per_sec()
323 		 * RTC frequency is derived from 32768Hz source without any  in pwm_nrf_sw_get_cycles_per_sec()
329 		 * HF timer frequency is derived from 16MHz source with a  in pwm_nrf_sw_get_cycles_per_sec()
332 		*cycles = 16000000UL / BIT(config->prescaler);  in pwm_nrf_sw_get_cycles_per_sec()
338 static DEVICE_API(pwm, pwm_nrf_sw_drv_api_funcs) = {
345 	const struct pwm_config *config = dev->config;  in pwm_nrf_sw_init()
346 	struct pwm_data *data = dev->data;  in pwm_nrf_sw_init()
350 	for (uint32_t i = 0; i < config->map_size; i++) {  in pwm_nrf_sw_init()
355 			err = nrfx_gppi_channel_alloc(&data->ppi_ch[i][j]);  in pwm_nrf_sw_init()
361 				return -ENOMEM;  in pwm_nrf_sw_init()
365 		err = nrfx_gpiote_channel_alloc(&config->gpiote[i],  in pwm_nrf_sw_init()
366 						&data->gpiote_ch[i]);  in pwm_nrf_sw_init()
372 			return -ENOMEM;  in pwm_nrf_sw_init()
375 		/* Set initial state of the output pins. */  in pwm_nrf_sw_init()
376 		nrf_gpio_pin_write(config->psel_ch[i],  in pwm_nrf_sw_init()
377 			(config->initially_inverted & BIT(i)) ? 1 : 0);  in pwm_nrf_sw_init()
378 		nrf_gpio_cfg_output(config->psel_ch[i]);  in pwm_nrf_sw_init()
391 		nrf_timer_prescaler_set(timer, config->prescaler);  in pwm_nrf_sw_init()