Re: [Zephyr-users] Buggy PWM driver for nRF52

NRF_PWM0->ENABLE = 1;

at last to achieve that.

Thanks once again !!

/* pwm output pin */
#define PWM_OUT_PIN		(0 | 31)
/* pwm frequency and clk in Hz */
#define PWM_FREQUENCY			1000
#define PWM_CLK					8000000
#define PWM_TOP_VALUE_FIX		(PWM_CLK / PWM_FREQUENCY)
#define PWM_MAX_DUTY			0.30f /* 30 % */
#define PWM_MIN_DUTY			0.05   /* 5% */
#define PWM_PERCENT_RESOLUTION	0.0125 /* % */
/* polarity to be added on pwm sequencer */
#define PWM_POLARITY_OFFSET		(1 << 15)

/** private variables */
static uint16_t nrf_pwm_sequence[4] = {4096 + PWM_POLARITY_OFFSET , 0 + PWM_POLARITY_OFFSET, 0 + PWM_POLARITY_OFFSET, 0 + PWM_POLARITY_OFFSET};
/**
 * temp_pwm_init()
 *
 * @brief inits the pwm controller and route it to the heater
 * @param
 * @return
 */
static void temp_pwm_init(void)
{
	NRF_PWM0->PSEL.OUT[0] = PWM_OUT_PIN;

	/* pwm in upmode */
	NRF_PWM0->MODE = 0;

	/* sets pwm count top to be at 1 KHz  and decode pwm in common mode*/
	NRF_PWM0->COUNTERTOP = PWM_CLK / PWM_FREQUENCY;
	NRF_PWM0->DECODER =  0x00000002;
	NRF_PWM0->LOOP = 0;
	NRF_PWM0->SEQ[0].REFRESH = 0;
	NRF_PWM0->SEQ[0].ENDDELAY = 0;

	/* select clock source prescaler */
	NRF_PWM0->PRESCALER = 0x00000001;

	/* enables the PWM */
	NRF_PWM0->SEQ[0].PTR  = ((uint32_t)nrf_pwm_sequence);
	NRF_PWM0->SEQ[0].CNT  = sizeof(nrf_pwm_sequence) / sizeof(uint16_t);
	NRF_PWM0->ENABLE = 1;

	/* trigger it! */
	NRF_PWM0->TASKS_SEQSTART[0] = 1;
}

/**
 * temp_pwm_set_val()
 *
 * @brief set the pwm with a new duty cicle
 * @param
 * @return
 */
static void temp_pwm_set_val(float required_energy)
{

#ifndef TEMP_CLOSED_LOOP
	/* saturate the energy expected */
	if(required_energy < TEMP_MAINTENANCE_ENERGY)
		required_energy = TEMP_MAINTENANCE_ENERGY;

	if(required_energy > TEMP_MAXIMUM_ENERGY_AVAILABLE)
		required_energy = TEMP_MAXIMUM_ENERGY_AVAILABLE;

#else
	/* saturate the energy required to the bound values, note in closed loop
	 * we can increase the pwm output to the maximum during a cycle
	 */
	if(required_energy < TEMP_MAINTENANCE_ENERGY)
		required_energy = TEMP_MAINTENANCE_ENERGY;

	if(required_energy > TEMP_MAXIMUM_ENERGY_EXCURTION)
		required_energy = TEMP_MAXIMUM_ENERGY_EXCURTION;

#endif

	/* obtains the duty cicle  and sums it up with polarity offset */
	uint16_t duty = (uint16_t)((required_energy / TEMP_MAXIMUM_ENERGY_EXCURTION) * (float)PWM_TOP_VALUE_FIX);
	duty |= PWM_POLARITY_OFFSET;

	/* update the duty cicle */
	nrf_pwm_sequence[0] = duty;
	nrf_pwm_sequence[1] = duty;
	nrf_pwm_sequence[2] = duty;
	nrf_pwm_sequence[3] = duty;

	NRF_PWM0->TASKS_SEQSTART[0] = 1;
}
CONFIG_STDOUT_CONSOLE=y
CONFIG_PRINTK=y
CONFIG_PWM=y
CONFIG_SYS_LOG=y
CONFIG_SYS_LOG_PWM_LEVEL=4

Could you please inform me, what I should do besides this ??

Thank You !!