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Free pins 4 & 15 on Teensy 3.0
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@PaulStoffregen
PaulStoffregen committed Jul 26, 2016
1 parent f2fd2f6 commit ad90655
Showing 1 changed file with 77 additions and 35 deletions.
112 changes: 77 additions & 35 deletions OctoWS2811.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -37,7 +37,6 @@ static uint8_t ones = 0xFF;
static volatile uint8_t update_in_progress = 0;
static uint32_t update_completed_at = 0;


OctoWS2811::OctoWS2811(uint32_t numPerStrip, void *frameBuf, void *drawBuf, uint8_t config)
{
stripLen = numPerStrip;
Expand Down Expand Up @@ -93,44 +92,61 @@ void OctoWS2811::begin(void)
pinMode(5, OUTPUT); // strip #8

// create the two waveforms for WS2811 low and high bits
switch (params & 0xF0) {
case WS2811_400kHz: {
frequency = 400000;
frameSetDelay = 50;
break; }
case WS2811_800kHz: {
frequency = 800000;
frameSetDelay = 50;
break; }
case WS2813_800kHz: {
frequency = 800000;
frameSetDelay = 300;
break; }
default: {
frequency = 800000;
frameSetDelay = 50;
break; }
}
switch (params & 0xF0) {
case WS2811_400kHz:
frequency = 400000;
frameSetDelay = 50;
break;
case WS2811_800kHz:
frequency = 800000;
frameSetDelay = 50;
break;
case WS2813_800kHz:
frequency = 800000;
frameSetDelay = 300;
break;
default:
frequency = 800000;
frameSetDelay = 50;
}


#if defined(__MK20DX128__)
FTM1_SC = 0;
FTM1_CNT = 0;
uint32_t mod = (F_BUS + frequency / 2) / frequency;
FTM1_MOD = mod - 1;
FTM1_SC = FTM_SC_CLKS(1) | FTM_SC_PS(0);
FTM1_C0SC = 0x69;
FTM1_C1SC = 0x69;
FTM1_C0V = (mod * WS2811_TIMING_T0H) >> 8;
FTM1_C1V = (mod * WS2811_TIMING_T1H) >> 8;
// pin 16 triggers DMA(port B) on rising edge
CORE_PIN16_CONFIG = PORT_PCR_IRQC(1)|PORT_PCR_MUX(3);
//CORE_PIN4_CONFIG = PORT_PCR_MUX(3); // testing only

#elif defined(__MK20DX256__)
analogWriteResolution(8);
analogWriteFrequency(3, frequency);
analogWriteFrequency(4, frequency);
analogWrite(3, WS2811_TIMING_T0H);
analogWrite(4, WS2811_TIMING_T1H);

#if defined(KINETISK)
// pin 16 triggers DMA(port B) on rising edge (configure for pin 3's waveform)
CORE_PIN16_CONFIG = PORT_PCR_IRQC(1)|PORT_PCR_MUX(3);
pinMode(3, INPUT_PULLUP); // pin 3 no longer needed

// pin 15 triggers DMA(port C) on falling edge of low duty waveform
// pin 15 and 16 must be connected by the user: 16 is output, 15 is input
pinMode(15, INPUT);
CORE_PIN15_CONFIG = PORT_PCR_IRQC(2)|PORT_PCR_MUX(1);

// pin 4 triggers DMA(port A) on falling edge of high duty waveform
CORE_PIN4_CONFIG = PORT_PCR_IRQC(2)|PORT_PCR_MUX(3);

#elif defined(KINETISL)
#elif defined(__MKL26Z64__)
analogWriteResolution(8);
analogWriteFrequency(3, frequency);
analogWriteFrequency(4, frequency);
analogWrite(3, WS2811_TIMING_T0H);
analogWrite(4, WS2811_TIMING_T1H);
// on Teensy-LC, use timer DMA, not pin DMA
//Serial1.println(FTM2_C0SC, HEX);
//FTM2_C0SC = 0xA9;
Expand Down Expand Up @@ -169,21 +185,25 @@ void OctoWS2811::begin(void)
dma3.source(ones);
dma3.destination(GPIOD_PCOR);
dma3.transferSize(1);
dma3.transferCount(bufsize);
dma3.transferCount(bufsize + 1);
dma3.disableOnCompletion();
dma3.interruptAtCompletion();

#ifdef __MK20DX256__
DMAPriorityOrder(dma3, dma2, dma1);

#if defined(__MK20DX128__)
// route the edge detect interrupts to trigger the 3 channels
dma1.triggerAtHardwareEvent(DMAMUX_SOURCE_PORTB);
dma2.triggerAtHardwareEvent(DMAMUX_SOURCE_FTM1_CH0);
dma3.triggerAtHardwareEvent(DMAMUX_SOURCE_FTM1_CH1);
#elif defined(__MK20DX256__)
MCM_CR = MCM_CR_SRAMLAP(1) | MCM_CR_SRAMUAP(0);
AXBS_PRS0 = 0x1032;
#endif

#if defined(KINETISK)
// route the edge detect interrupts to trigger the 3 channels
dma1.triggerAtHardwareEvent(DMAMUX_SOURCE_PORTB);
dma2.triggerAtHardwareEvent(DMAMUX_SOURCE_PORTC);
dma3.triggerAtHardwareEvent(DMAMUX_SOURCE_PORTA);
#elif defined(KINETISL)
#elif defined(__MKL26Z64__)
// route the timer interrupts to trigger the 3 channels
dma1.triggerAtHardwareEvent(DMAMUX_SOURCE_FTM2_OV);
dma2.triggerAtHardwareEvent(DMAMUX_SOURCE_FTM2_CH0);
Expand All @@ -197,13 +217,15 @@ void OctoWS2811::begin(void)

void OctoWS2811::isr(void)
{
//digitalWriteFast(9, HIGH);
//Serial1.print(".");
//Serial1.println(dma3.CFG->DCR, HEX);
//Serial1.print(dma3.CFG->DSR_BCR > 24, HEX);
dma3.clearInterrupt();
//Serial1.print("*");
update_completed_at = micros();
update_in_progress = 0;
//digitalWriteFast(9, LOW);
}

int OctoWS2811::busy(void)
Expand All @@ -230,7 +252,29 @@ void OctoWS2811::show(void)
// wait for WS2811 reset
while (micros() - update_completed_at < frameSetDelay) ;

#if defined(KINETISK)
#if defined(__MK20DX128__)
// ok to start, but we must be very careful to begin
// without any prior 3 x 800kHz DMA requests pending
uint32_t cv = FTM1_C1V;
noInterrupts();
// CAUTION: this code is timing critical.
while (FTM1_CNT <= cv) ;
while (FTM1_CNT >= cv) ; // wait for beginning of an 800 kHz cycle
while (FTM1_CNT < cv -2) ;
FTM1_SC = 0; // stop FTM1 timer (hopefully before it rolls over)
//FTM1_SC = 0;
update_in_progress = 1;
digitalWriteFast(9, HIGH); // oscilloscope trigger
PORTB_ISFR = (1<<0); // clear any prior rising edge
FTM1_C0SC = 0x69;
FTM1_C1SC = 0x69;
dma1.enable();
dma2.enable(); // enable all 3 DMA channels
dma3.enable();
FTM1_SC = FTM_SC_CLKS(1) | FTM_SC_PS(0); // restart FTM1 timer
digitalWriteFast(9, LOW);

#elif defined(__MK20DX256__)
// ok to start, but we must be very careful to begin
// without any prior 3 x 800kHz DMA requests pending
uint32_t sc = FTM1_SC;
Expand Down Expand Up @@ -259,7 +303,8 @@ void OctoWS2811::show(void)
dma3.enable();
FTM1_SC = sc; // restart FTM1 timer
//digitalWriteFast(9, LOW);
#elif defined(KINETISL)

#elif defined(__MKL26Z64__)
uint32_t sc = FTM2_SC;
uint32_t cv = FTM2_C1V;
noInterrupts();
Expand All @@ -269,8 +314,6 @@ void OctoWS2811::show(void)
while (FTM2_CNT < cv) ;
FTM2_SC = 0; // stop FTM2 timer (hopefully before it rolls over)
//digitalWriteFast(9, HIGH); // oscilloscope trigger


dma1.clearComplete();
dma2.clearComplete();
dma3.clearComplete();
Expand All @@ -279,7 +322,6 @@ void OctoWS2811::show(void)
dma2.transferCount(bufsize);
dma3.transferCount(bufsize);
dma2.sourceBuffer((uint8_t *)frameBuffer, bufsize);

// clear any pending event flags
FTM2_SC = 0x80;
FTM2_C0SC = 0xA9; // clear any previous pending DMA requests
Expand Down

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