FlexPWM setting for single PWM

waqasbutt121 — Fri, 20 Jul 2018 18:32:36 GMT

I am using the flexPWM module of MKV561M0VLL24. I am configuring my controller with the following setting but it is not working

Note: The code is for generating a single PWM on PWM0_A2.

PWM0->OUTEN = PWM_OUTEN_PWMA_EN((1 << 2));
PWM0->SM[2].CTRL = PWM_CTRL_LDFQ(0) |
                                                PWM_CTRL_HALF(0) |
                                                PWM_CTRL_FULL(1) |
                                                PWM_CTRL_PRSC(5) |
                                                PWM_CTRL_LDMOD(1);
PWM0->SM[2].CTRL2 = PWM_CTRL2_INDEP_MASK |
                                       PWM_CTRL2_PWM23_INIT(0) |
                                       PWM_CTRL2_INIT_SEL(0) |
                                       PWM_CTRL2_FRCEN(0) |
                                       PWM_CTRL2_FORCE(0) |
                                       PWM_CTRL2_FORCE_SEL(0) |
                                       PWM_CTRL2_CLK_SEL(0);
PWM0->SM[2].INIT = 0;
PWM0->SM[2].VAL1 = 1999;
PWM0->SM[2].VAL0 = 999;
PWM0->SM[2].VAL2 = 0;
PWM0->SM[2].VAL3 = 599;

PWM0->MCTRL = PWM_MCTRL_LDOK((1 << 2));

PWM0->MCTRL |= PWM_MCTRL_RUN((1 << 2));

The CNT register of this channel appears to be going beyond the VAL1 limit (which shouldn't happen if values are correctly loaded) and no PWM is generated. Kindly help

Re: FlexPWM setting for single PWM

waqasbutt121 — Sat, 21 Jul 2018 07:00:05 GMT

Problem Solved:

Fault Status was not clear. Clearing the fault status resolved the problem

PWM0->FSTS = PWM_FSTS_FFLAG(0xF);

Moreover there is a strange behaviour, If i write the LDOK field in MCTRL without reading the MCCTRL register, it doesn't update

Kinetis Microcontrollers中的主题 FlexPWM setting for single PWM

FlexPWM setting for single PWM

Re: FlexPWM setting for single PWM