Rainbow color using FTM PWM with KSDK 1.3

Hi all,

there is a simple modification of ftm driver example based on KSDK 1.3, KDS 3.0 on FRDM-K22F.

enabling clocks for PORTs in hardware_init.c

void hardware_init(void) {    /* enable clock for PORTs */   CLOCK_SYS_EnablePortClock(PORTA_IDX);   CLOCK_SYS_EnablePortClock(PORTD_IDX);   CLOCK_SYS_EnablePortClock(PORTE_IDX);    PORT_HAL_SetMuxMode(PORTA,1u,kPortMuxAlt3);//red   PORT_HAL_SetMuxMode(PORTA,2u,kPortMuxAlt3);//green   PORT_HAL_SetMuxMode(PORTD,5u,kPortMuxAlt4);//blue    /* Init board clock */   BOARD_ClockInit();   dbg_uart_init(); }

function for converting HSV to RGB color palette downloaded from hsv2rgb.cpp - shiftpwm - Arduino library to PWM many outputs with chained shift registers. - Google ...

setting ftm parameters for red, green and blue color, for red color:

 ftm_pwm_param_t ftmParamR = {         .mode                   = kFtmEdgeAlignedPWM,         .edgeMode               = kFtmLowTrue,         .uFrequencyHZ           = 24000u,         .uDutyCyclePercent      = 0,         .uFirstEdgeDelayPercent = 0,     };

setting PWM output for each color in infinite loop

        FTM_DRV_PwmStart(BOARD_FTM_INSTANCE, &ftmParamR, 6);         FTM_DRV_PwmStart(BOARD_FTM_INSTANCE, &ftmParamG, 7);         FTM_DRV_PwmStart(BOARD_FTM_INSTANCE, &ftmParamB, 5);

forwarding parameters to hsv2rgb()

hsv2rgb(hue,255,255,&red,&green,&blue,255);

changing hue and checking overflow of hue

        hue++;         if(hue>=360)hue=0;

normalizing from 0-255 to 0-100 percent of PWM pulse width for each color

        ftmParamR.uDutyCyclePercent = (uint8_t)(((float)red/255.0)*100.0);         ftmParamG.uDutyCyclePercent = (uint8_t)(((float)green/255.0)*100.0);         ftmParamB.uDutyCyclePercent = (uint8_t)(((float)blue/255.0)*100.0);

That´s all!

Importing example