I have the frdm-k64f and the mbed application shield. On this shield there is a RGB led that I'm trying to control. However nothin happens. It looks like no pules is generated at all.
static inline void RGB_LED(uint32_t red, uint32_t green, uint32_t blue) {
//FTM0_C5V = red;
FTM0_C4V = green;
FTM0_C7V = blue;
}
void frdm_as_led_init() {
// Power on
SIM_SCGC5 |= SIM_SCGC5_PORTC_MASK | SIM_SCGC5_PORTA_MASK;
SIM_SCGC6 |= SIM_SCGC6_FTM0_MASK;
//SIM_SOPT4 |= SIM_SOPT4_FTM0TRG0SRC(1);
//NOTE: multiplexing port pat0 will cause cpu to hard fault on revision other then E
// because it's also routed to the debugger
//PORTA_PCR0 = PORT_PCR_MUX(3); // FTM0_CH5
PORTC_PCR4 = PORT_PCR_MUX(4); // FTM0_CH4
PORTA_PCR2 = PORT_PCR_MUX(3); // FTM0_CH7
RGB_LED(0,0,0);
// Make write_protected registers writable
FTM0_MODE |= FTM_MODE_WPDIS_MASK;
FTM0_MODE &= ~ FTM_MODE_FTMEN_MASK;
// Overflow at 99
FTM0_MOD = 99;
FTM0_CNTIN = 0;
FTM0_CNT = 0;
FTM0_C4SC = FTM_CnSC_MSB_MASK | FTM_CnSC_ELSA_MASK | FTM_CnSC_ELSB_MASK;
//FTM0_C5SC = FTM_CnSC_MSB_MASK | FTM_CnSC_ELSA_MASK;
FTM0_C7SC = FTM_CnSC_MSB_MASK | FTM_CnSC_ELSA_MASK | FTM_CnSC_ELSB_MASK;
FTM0_SC = FTM_SC_CLKS(1) | FTM_SC_PS(7); /* Edge Aligned PWM running from BUSCLK / 128 */
RGB_LED(400,400,400);
}
