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[LPC11XX] Fixed PwmOut spike pulse issue #371

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merged 1 commit into from Jun 24, 2014
Merged

[LPC11XX] Fixed PwmOut spike pulse issue #371

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11 changes: 9 additions & 2 deletions libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC11XX_11CXX/pwmout_api.c
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Expand Up @@ -109,11 +109,15 @@ void pwmout_write(pwmout_t* obj, float value) {
} else if (value > 1.0f) {
value = 1.0;
}

timer_mr tid = pwm_timer_map[obj->pwm];
LPC_TMR_TypeDef *timer = Timers[tid.timer];
uint32_t t_off = timer->MR3 - (uint32_t)((float)(timer->MR3) * value);

// to avoid spike pulse when duty is 0%
if (value == 0) {
t_off++;
}

timer->TCR = TCR_RESET;
timer->MR[tid.mr] = t_off;
timer->TCR = TCR_CNT_EN;
Expand All @@ -124,6 +128,9 @@ float pwmout_read(pwmout_t* obj) {
LPC_TMR_TypeDef *timer = Timers[tid.timer];

float v = (float)(timer->MR3 - timer->MR[tid.mr]) / (float)(timer->MR3);
if (timer->MR[tid.mr] > timer->MR3) {
v = 0.0f;
}
return (v > 1.0f) ? (1.0f) : (v);
}

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