nRF5 RTC PWM

PWM controller driver generating a PWM output with an nRF5 RTC. More...

Data Structures
struct	pbl_pwm_nrf5_rtc
	nRF5 RTC PWM controller. More...

Macros
#define	PBL_PWM_NRF5_RTC_DEFINE(sym, _name, _rtc, _out, _deps)
	Define an nRF5 RTC PWM controller.

Detailed Description

PWM controller driver generating a PWM output with an nRF5 RTC.

One channel, generated without the CPU or the high-frequency clock: the RTC counts the 32768 Hz low-frequency clock, and PPI connects its compare events to GPIOTE tasks driving the output, one at the end of the period, which also clears the counter, and one at the end of the duty cycle. The period and duty cycle resolution is one RTC tick, about 30.5 us. A 0% or 100% duty cycle stops the RTC and holds the output.

PBL_PWM_NRF5_RTC_DEFINE(s_extcomin, "extcomin", 2, PBL_GPIO(NRF5_GPIO_P1, 15, 0), NULL);

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Data Structure Documentation

pbl_pwm_nrf5_rtc

struct pbl_pwm_nrf5_rtc

nRF5 RTC PWM controller.

Data Fields
struct pbl_pwm_controller	ctrl	PWM controller.
struct pbl_gpio	out	Output.
uint8_t	rtc	RTC instance, from 0, not used by anything else.
struct pbl_pwm_nrf5_rtc_state *	state	Driver runtime state.

Macro Definition Documentation

PBL_PWM_NRF5_RTC_DEFINE

#define PBL_PWM_NRF5_RTC_DEFINE	(		sym,
			_name,
			_rtc,
			_out,
			_deps
	)

Value:

  PBL_PWM_CONTROLLER_STATE_DEFINE(sym, 1);                                                        \
  static struct pbl_pwm_nrf5_rtc_state sym##_nrf5_rtc_state;                                      \
  const struct pbl_pwm_nrf5_rtc sym = {                                                           \
    .ctrl =                                                                                       \
        PBL_PWM_CONTROLLER_INIT(sym, _name, pbl_pwm_nrf5_rtc_init, _deps, &pbl_pwm_nrf5_rtc_ops), \
    .state = &sym##_nrf5_rtc_state,                                                               \
    .out = _out,                                                                                  \
    .rtc = (_rtc),                                                                                \
  };                                                                                              \
  PBL_DEVICE_REGISTER(sym, &sym.ctrl.dev)

Define an nRF5 RTC PWM controller.

Parameters

sym	Symbol of the controller.
_name	Name.
_rtc	RTC instance generating the output, 0 to 2.
_out	Output, from PBL_GPIO().
_deps	Dependencies from PBL_DEVICE_DEPS(), or NULL.