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[LPC812] Fix PwmOut conflict issue #1758

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Merged
merged 1 commit into from
May 23, 2016
Merged

[LPC812] Fix PwmOut conflict issue #1758

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8 changes: 8 additions & 0 deletions libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC81X/pwmout_api.c
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Original file line number Diff line number Diff line change
Expand Up @@ -152,10 +152,18 @@ void pwmout_write(pwmout_t* obj, float value) {
uint32_t t_off = (uint32_t)((float)(obj->pwm->MATCHREL[0].U) * value);
obj->pwm->MATCHREL[(obj->pwm_ch) + 1].U = t_off; // New endtime

// Clear OxRES (conflict resolution register) bit first, effect of simultaneous set and clear on output x
int offset = (obj->pwm_ch * 2);
obj->pwm->RES &= ~(0x3 << offset);

if (value == 0.0f) { // duty is 0%
// Clear output
obj->pwm->RES |= (0x2 << offset);
// Set CLR event to be same as SET event, makes output to be 0 (low)
obj->pwm->OUT[(obj->pwm_ch)].CLR = (1 << 0);
} else {
// Set output
obj->pwm->RES |= (0x1 << offset);
// Use normal CLR event (current SCT ch + 1)
obj->pwm->OUT[(obj->pwm_ch)].CLR = (1 << ((obj->pwm_ch) + 1));
}
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