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driver: pwm: infineon: Use PWM buffer updates

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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: John Batch <john.batch@infineon.com>
This commit is contained in:
John Batch 2025-04-18 16:01:03 -07:00 • committed by Benjamin Cabé
commit b1950615bd
1 changed files with 10 additions and 2 deletions
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12
drivers/pwm/pwm_ifx_cat1.c
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@ -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;