Commit b1950615 authored by John Batch's avatar John Batch Committed by Benjamin Cabé
Browse files

driver: pwm: infineon: Use PWM buffer updates 

Change PWM to use buffers registers instead of writing period
and compare directly.  This addressses an issue when updating
period to a value less than current counter, as demonstrated
in the blinky_pwm sample running on the CYW920829M2EVK_02
board.

Signed-off-by: default avatarJohn Batch <john.batch@infineon.com>
parent 27021928

drivers/pwm/pwm_ifx_cat1.c

+10 −2
Changes for drivers/pwm/pwm_ifx_cat1.c: 10 added lines, 2 removed lines.
Original line number Diff line number Diff line
@@ -54,6 +54,8 @@ static int ifx_cat1_pwm_init(const struct device *dev) 
		.runMode = CY_TCPWM_PWM_CONTINUOUS,

		.countInputMode = CY_TCPWM_INPUT_LEVEL,

		.countInput = CY_TCPWM_INPUT_1,

		.enableCompareSwap = true,

		.enablePeriodSwap = true,

	};



	/* Configure PWM clock */
@@ -110,8 +112,14 @@ static int ifx_cat1_pwm_set_cycles(const struct device *dev, uint32_t channel, 
	if ((period_cycles == 0) || (pulse_cycles == 0)) {

		Cy_TCPWM_PWM_Disable(PWM_REG_BASE, data->pwm_num);

	} else {

		Cy_TCPWM_PWM_SetPeriod0(PWM_REG_BASE, data->pwm_num, period_cycles);

		Cy_TCPWM_PWM_SetCompare0Val(PWM_REG_BASE, data->pwm_num, pulse_cycles);

		/* Update period and compare values using buffer registers so the new values

		 * take effect on the next TC event

		 */

		Cy_TCPWM_PWM_SetPeriod1(PWM_REG_BASE, data->pwm_num, period_cycles);

		Cy_TCPWM_PWM_SetCompare0BufVal(PWM_REG_BASE, data->pwm_num, pulse_cycles);



		/* Trigger the swap by writing to the SW trigger command register. */

		Cy_TCPWM_TriggerCaptureOrSwap_Single(PWM_REG_BASE, data->pwm_num);



		if ((flags & PWM_POLARITY_MASK) == PWM_POLARITY_INVERTED) {

			config->reg_addr->CTRL &= ~TCPWM_GRP_CNT_V2_CTRL_QUAD_ENCODING_MODE_Msk;

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