Hi, I hope anyone can help me....
First of all my facts:
I'm using CW V.1.4 (without PEX), to program a MK20DX128 (50MHz)
I would like to generate a PWM signal with selectable period and duty cycle. I thought it would
be very easy, so i did it like described in the datasheet:
PERIOD = (MOD-CNTIN+0x0001)
DUTY CYCLE = (CnV-CNTIN)
FTM0_C1SC = 0x00 /* Clear the FTM0_C1SC register */
| FTM_CnSC_MSB_MASK /* Used for further selections in the channel logic */
| FTM_CnSC_ELSB_MASK /* Edge or Level Select */
| FTM_CnSC_ELSA_MASK; /* Edge or Level Select */
FTM0_SC = 0x00 /* Clear the FTM0_SC register */
|FTM_SC_CLKS(0x01); /* Selects the System clock */
FTM0_CNTIN = FTM_CNTIN_INIT(0x0000); /* Initialisation value */
FTM0_CNT = FTM_CNT_COUNT(0x0000); /* Set counter register */
FTM0_MOD = FTM_MOD_MOD(0x0000); /* Set up modulo register */
FTM0_C1V = FTM_CnV_VAL(0x8000); /* Set up the duty cycle */
In this case the duty cycle is 50% how expected... but there isn't any change when I change CNTIN_INIT....
were is my fault here?
The next point is, when I would like to change the Period and change the mod register there isn't a PWM Signal anymore.
Hope anyone can help me