Test program for my Multi_WS2811 library that started out as a fork of heroic/WS2811. My library uses hardware DMA on the FRDM-KL25Z to drive up to 16 strings of WS2811 or WS2812 LEDs in parallel.
Dependencies: Multi_WS2811 mbed MMA8451Q
Fork of WS2811 by
NOTE: I have accidentally pushed changes for another fork of this program that I used in the recent Georgetown Carnival Power Tool Races. When I get some time, I will restore the test program to its original glory.
You can see my power tool racer (Nevermore's Revenge) here
This tests my FRDM-KL25Z multi-string WS2811/WS2812 library. It uses the accelerometer to change the rainbow phase on two strings of LEDs as well as the touch sense to change brightness.
A video of this program in operation is here.
Here is the library that I developed to run the LEDs:
Import libraryMulti_WS2811
Library allowing up to 16 strings of 60 WS2811 or WS2812 LEDs to be driven from a single FRDM-KL25Z board. Uses hardware DMA to do a full 800 KHz rate without much CPU burden.
Revision 21:4541da183397, committed 2014-01-02
- Comitter:
- bikeNomad
- Date:
- Thu Jan 02 00:50:09 2014 +0000
- Parent:
- 20:b9d76e567637
- Child:
- 22:abfed71656bd
- Commit message:
- Got parallel mode working!
Changed in this revision
--- a/LedStrip.h Sat Dec 21 04:32:21 2013 +0000 +++ b/LedStrip.h Thu Jan 02 00:50:09 2014 +0000 @@ -41,4 +41,4 @@ uint8_t *pixels; // Holds LED color values uint16_t numLEDs; // Number of RGB LEDs in strand }; -#endif \ No newline at end of file +#endif
--- a/WS2811.cpp Sat Dec 21 04:32:21 2013 +0000 +++ b/WS2811.cpp Thu Jan 02 00:50:09 2014 +0000 @@ -1,145 +1,394 @@ -// 800 KHz WS2811 driver, kinda. -// -// Parameterized and modified to use soft SPI. -// Jas Strong <jasmine@electronpusher.org> -// Modified to use hard SPI by Ned Konz <ned@bike-nomad.com> -/*****************************************************************************/ - -#include "LedStrip.h" -#include "WS2811.h" -extern void dump_spi_settings(SPI_Type const *spi); -extern Serial pc; -extern DigitalOut debugOut; - -static const unsigned DMA_MUX_SRC_SPI0_Transmit = 17; -// const unsigned DMA_MUX_SRC_SPI1_Transmit = 19; - -static const unsigned dmaWriteChannel = 0; -static const unsigned dmaXmitMuxSrc = DMA_MUX_SRC_SPI0_Transmit; - -static volatile bool dma_done = false; - -// 12.8 MHz => 800KHz bit rate (1.25 usec/byte) - -WS2811::WS2811(int n, SPI_Type *_spi, PinName _mosi, PinName sclk) : - LedStrip(n), - spi(_spi), - mosi(_mosi) -{ - SPI spitemp(_mosi, NC, sclk); - spitemp.format(8,3); - spitemp.frequency(800e3 * 16 * 2); // 12 MHz (48MHz/60) => 750KHz rate (1.33 usec/byte) - - //Enable DMA clocking - SIM->SCGC6 |= SIM_SCGC6_DMAMUX_MASK; // Enable clock to DMA mux - SIM->SCGC7 |= SIM_SCGC7_DMA_MASK; // Enable clock to DMA - - // reset DMAMUX - DMAMUX0->CHCFG[dmaWriteChannel] = 0; - DMAMUX0->CHCFG[dmaWriteChannel] = DMAMUX_CHCFG_ENBL_MASK | DMAMUX_CHCFG_SOURCE(dmaXmitMuxSrc); - - // Enable DMA features within the SPI registers - spi->C1 |= SPI_C1_SPTIE_MASK | // enable transmit-interrupt - SPI_C1_MSTR_MASK; -} - -/* - * These chips use a one-wire protocol based on a sort of NRZ signalling- jas. - * Spec is 1.25usec +/- 600nsec => 650nsec to 1850nsec - */ - - -void WS2811::startDMA() -{ - DMA0->DMA[dmaWriteChannel].DSR_BCR = DMA_DSR_BCR_DONE_MASK; // clear/reset DMA status - DMA0->DMA[dmaWriteChannel].SAR = (uint32_t)(void*)dmaBytes; // set source address - DMA0->DMA[dmaWriteChannel].DAR = (uint32_t)(void*)&(spi->D); // set dest address: SPI0_Data register - DMA0->DMA[dmaWriteChannel].DSR_BCR |= DMA_DSR_BCR_BCR_MASK & sizeof(dmaBytes); // length of transfer - DMA0->DMA[dmaWriteChannel].DCR = DMA_DCR_EINT_MASK | // enable interrupt on end of transfer - DMA_DCR_ERQ_MASK | - DMA_DCR_SINC_MASK | - DMA_DCR_SSIZE(0x01) | - DMA_DCR_DSIZE(0x01) | - // DMA_DCR_START_MASK | - DMA_DCR_D_REQ_MASK; // clear ERQ on end of transfer - - dump_spi_settings(spi); - - debugOut = 1; - - while (!(spi->S & SPI_S_SPTEF_MASK)) - __NOP(); - spi->D = dmaBytes[0]; +// 800 KHz WS2811 driver driving potentially many LED strings. +// Uses 3-phase DMA +// 16K SRAM less stack, etc. +// +// Per LED: 3 bytes (malloc'd) for RGB data +// +// Per LED strip / per LED +// 96 bytes (static) for bit data +// + 96 bytes (static) for ones data +// = 192 bytes +// +// 40 LEDs max per string = 7680 bytes static +// +// 40 LEDs: 7680 + 40*3 = 7800 bytes +// 80 LEDs: 7680 + 80*3 = 7920 bytes + +#include "MKL25Z4.h" +#include "LedStrip.h" +#include "WS2811.h" + +// +// Configuration +// + +// Define MONITOR_TPM0_PWM as non-zero to monitor PWM timing on PTD0 and PTD1 +// PTD0 TPM0/CH0 PWM_1 J2/06 +// PTD1 TPM0/CH1 PWM_2 J2/12 (also LED_BLUE) +#define MONITOR_TPM0_PWM 0 + +// define DEBUG_PIN to identify a pin in PORTD used for debug output +// #define DEBUG_PIN 3 /* PTD3 debugOut */ + +#ifdef DEBUG_PIN +#define DEBUG 1 +#endif + +#if DEBUG +#define DEBUG_MASK (1<<DEBUG_PIN) +#define RESET_DEBUG (IO_GPIO->PDOR &= ~DEBUG_MASK) +#define SET_DEBUG (IO_GPIO->PDOR |= DEBUG_MASK) +#else +#define DEBUG_MASK 0 +#define RESET_DEBUG (void)0 +#define SET_DEBUG (void)0 +#endif + +static PORT_Type volatile * const IO_PORT = PORTD; +static GPIO_Type volatile * const IO_GPIO = PTD; + +// 48 MHz clock, no prescaling. +#define NSEC_TO_TICKS(nsec) ((nsec)*48/1000) +static const uint32_t CLK_NSEC = 1250; +static const uint32_t tpm_period = NSEC_TO_TICKS(CLK_NSEC); +static const uint32_t tpm_p0_period = NSEC_TO_TICKS(CLK_NSEC / 3); +static const uint32_t tpm_p1_period = NSEC_TO_TICKS(CLK_NSEC * 2 / 3); + +enum DMA_MUX_SRC +{ + DMA_MUX_SRC_TPM0_CH_0 = 24, + DMA_MUX_SRC_TPM0_CH_1, + DMA_MUX_SRC_TPM0_Overflow = 54, +}; + +enum DMA_CHAN +{ + DMA_CHAN_START = 0, + DMA_CHAN_0_LOW = 1, + DMA_CHAN_1_LOW = 2, + N_DMA_CHANNELS +}; + +static volatile bool dma_done = true; + +// class static +bool WS2811::initialized = false; + +// class static +uint32_t WS2811::enabledPins = 0; + +#define WORD_ALIGNED __attribute__ ((aligned(4))) + +#define DMA_LEADING_ZEROS 2 +#define BITS_PER_RGB 24 +#define DMA_TRAILING_ZEROS 1 + +static struct +{ + uint32_t start_t1_low[ DMA_LEADING_ZEROS ]; + uint32_t dmaWords[ BITS_PER_RGB * MAX_LEDS_PER_STRIP ]; + uint32_t trailing_zeros_1[ DMA_TRAILING_ZEROS ]; + + uint32_t start_t0_high[ DMA_LEADING_ZEROS - 1 ]; + uint32_t allOnes[ BITS_PER_RGB * MAX_LEDS_PER_STRIP ]; + uint32_t trailing_zeros_2[ DMA_TRAILING_ZEROS + 1 ]; +} dmaData WORD_ALIGNED; + +// class static +bool WS2811::is_dma_done() +{ + return dma_done; +} + +// class static +void WS2811::hw_init() +{ + if (initialized) return; + + dma_data_init(); + clock_init(); + dma_init(); + io_init(); + tpm_init(); + + initialized = true; +} + +// class static +void WS2811::dma_data_init() +{ + memset(dmaData.allOnes, 0xFF, sizeof(dmaData.allOnes)); + +#if DEBUG + for (unsigned i = 0; i < BITS_PER_RGB * MAX_LEDS_PER_STRIP; i++) + dmaData.dmaWords[i] = DEBUG_MASK; +#endif +} + +// class static + +/// Enable PORTD, DMA and TPM0 clocking +void WS2811::clock_init() +{ + SIM->SCGC5 |= SIM_SCGC5_PORTD_MASK; + SIM->SCGC6 |= SIM_SCGC6_DMAMUX_MASK | SIM_SCGC6_TPM0_MASK; // Enable clock to DMA mux and TPM0 + SIM->SCGC7 |= SIM_SCGC7_DMA_MASK; // Enable clock to DMA + + SIM->SOPT2 |= SIM_SOPT2_TPMSRC(1); // Clock source: MCGFLLCLK or MCGPLLCLK +} + +// class static + +/// Configure GPIO output pins +void WS2811::io_init() +{ + uint32_t m = 1; + for (uint32_t i = 0; i < 32; i++) + { + // set up each pin + if (m & enabledPins) + { + IO_PORT->PCR[i] = PORT_PCR_MUX(1) // GPIO + | PORT_PCR_DSE_MASK; // high drive strength + } + m <<= 1; + } + + IO_GPIO->PDDR |= enabledPins; // set as outputs + +#if MONITOR_TPM0_PWM + // PTD0 CH0 monitor: TPM0, high drive strength + IO_PORT->PCR[0] = PORT_PCR_MUX(4) | PORT_PCR_DSE_MASK; + // PTD1 CH1 monitor: TPM0, high drive strength + IO_PORT->PCR[1] = PORT_PCR_MUX(4) | PORT_PCR_DSE_MASK; + IO_GPIO->PDDR |= 3; // set as outputs + IO_GPIO->PDOR &= ~(enabledPins | 3); // initially low +#else + IO_GPIO->PDOR &= ~enabledPins; // initially low +#endif + +#if DEBUG + IO_PORT->PCR[DEBUG_PIN] = PORT_PCR_MUX(1) | PORT_PCR_DSE_MASK; + IO_GPIO->PDDR |= DEBUG_MASK; + IO_GPIO->PDOR &= ~DEBUG_MASK; +#endif +} + +// class static + +/// Configure DMA and DMAMUX +void WS2811::dma_init() +{ + // reset DMAMUX + DMAMUX0->CHCFG[DMA_CHAN_START] = 0; + DMAMUX0->CHCFG[DMA_CHAN_0_LOW] = 0; + DMAMUX0->CHCFG[DMA_CHAN_1_LOW] = 0; + + // wire our DMA event sources into the first three DMA channels + // t=0: all enabled outputs go high on TPM0 overflow + DMAMUX0->CHCFG[DMA_CHAN_START] = DMAMUX_CHCFG_ENBL_MASK | DMAMUX_CHCFG_SOURCE(DMA_MUX_SRC_TPM0_Overflow); + // t=tpm_p0_period: all of the 0 bits go low. + DMAMUX0->CHCFG[DMA_CHAN_0_LOW] = DMAMUX_CHCFG_ENBL_MASK | DMAMUX_CHCFG_SOURCE(DMA_MUX_SRC_TPM0_CH_0); + // t=tpm_p1_period: all outputs go low. + DMAMUX0->CHCFG[DMA_CHAN_1_LOW] = DMAMUX_CHCFG_ENBL_MASK | DMAMUX_CHCFG_SOURCE(DMA_MUX_SRC_TPM0_CH_1); + + NVIC_EnableIRQ(DMA0_IRQn); +} + +// class static + +/// Configure TPM0 to do two different PWM periods at 800kHz rate +void WS2811::tpm_init() +{ + // set up TPM0 for proper period (800 kHz = 1.25 usec ±600nsec) + TPM_Type volatile *tpm = TPM0; + tpm->SC = TPM_SC_DMA_MASK // enable DMA + | TPM_SC_CMOD(0) // disable clocks + | TPM_SC_PS(0); // 48MHz / 1 = 48MHz clock + tpm->MOD = tpm_period - 1; // 48MHz / 800kHz + + // No Interrupts; High True pulses on Edge Aligned PWM + tpm->CONTROLS[0].CnSC = TPM_CnSC_MSB_MASK | TPM_CnSC_ELSB_MASK | TPM_CnSC_DMA_MASK; + tpm->CONTROLS[1].CnSC = TPM_CnSC_MSB_MASK | TPM_CnSC_ELSB_MASK | TPM_CnSC_DMA_MASK; + + // set TPM0 channel 0 for 0.35 usec (±150nsec) / 0.8 usec (±150nsec) (0 code) + // 1.25 usec * 1/3 = 417 nsec + tpm->CONTROLS[0].CnV = tpm_p0_period; + + // set TPM0 channel 1 for 0.7 usec (±150nsec) / 0.6 usec (±150nsec) (1 code) + // 1.25 usec * 2/3 = 833 nsec + tpm->CONTROLS[1].CnV = tpm_p1_period; +} + +WS2811::WS2811(unsigned n, unsigned pinNumber) + : LedStrip(n) + , pinMask(1U << pinNumber) +{ + enabledPins |= pinMask; + guardtime.start(); +} + +// class static +void WS2811::startDMA() +{ + DMA_Type volatile * dma = DMA0; + TPM_Type volatile *tpm = TPM0; + uint32_t nBytes = sizeof(dmaData.start_t1_low) + + sizeof(dmaData.dmaWords) + + sizeof(dmaData.trailing_zeros_1); + + tpm->SC &= ~TPM_SC_CMOD_MASK; // disable internal clocking + tpm->CNT = tpm_p0_period - 2 ; + tpm->STATUS = 0xFFFFFFFF; + + dma->DMA[DMA_CHAN_START].DSR_BCR = DMA_DSR_BCR_DONE_MASK; // clear/reset DMA status + dma->DMA[DMA_CHAN_0_LOW].DSR_BCR = DMA_DSR_BCR_DONE_MASK; // clear/reset DMA status + dma->DMA[DMA_CHAN_1_LOW].DSR_BCR = DMA_DSR_BCR_DONE_MASK; // clear/reset DMA status + + // t=0: all outputs go high + // triggered by TPM0_Overflow + // source is one word of 0 then 24 x 0xffffffff, then another 0 word + dma->DMA[DMA_CHAN_START].SAR = (uint32_t)(void*)dmaData.start_t0_high; + dma->DMA[DMA_CHAN_START].DSR_BCR = DMA_DSR_BCR_BCR_MASK & nBytes; // length of transfer in bytes + + // t=tpm_p0_period: some outputs (the 0 bits) go low. + // Triggered by TPM0_CH0 + // Start 2 words before the actual data to avoid garbage pulses. + dma->DMA[DMA_CHAN_0_LOW].SAR = (uint32_t)(void*)dmaData.start_t1_low; // set source address + dma->DMA[DMA_CHAN_0_LOW].DSR_BCR = DMA_DSR_BCR_BCR_MASK & nBytes; // length of transfer in bytes + + // t=tpm_p1_period: all outputs go low. + // Triggered by TPM0_CH1 + // source is constant 0x00000000 (first word of dmaWords) + dma->DMA[DMA_CHAN_1_LOW].SAR = (uint32_t)(void*)dmaData.start_t1_low; // set source address + dma->DMA[DMA_CHAN_1_LOW].DSR_BCR = DMA_DSR_BCR_BCR_MASK & nBytes; // length of transfer in bytes + + dma->DMA[DMA_CHAN_0_LOW].DAR + = dma->DMA[DMA_CHAN_1_LOW].DAR + = dma->DMA[DMA_CHAN_START].DAR + = (uint32_t)(void*)&IO_GPIO->PDOR; + + // wait until done + while (!is_dma_done()) + { + __WFI(); + } + + SET_DEBUG; + + dma->DMA[DMA_CHAN_0_LOW].DCR = DMA_DCR_EINT_MASK // enable interrupt on end of transfer + | DMA_DCR_ERQ_MASK + | DMA_DCR_D_REQ_MASK // clear ERQ on end of transfer + | DMA_DCR_SINC_MASK // increment source each transfer + | DMA_DCR_CS_MASK + | DMA_DCR_SSIZE(0) // 32-bit source transfers + | DMA_DCR_DSIZE(0); // 32-bit destination transfers + + dma->DMA[DMA_CHAN_1_LOW].DCR = DMA_DCR_EINT_MASK // enable interrupt on end of transfer + | DMA_DCR_ERQ_MASK + | DMA_DCR_D_REQ_MASK // clear ERQ on end of transfer + | DMA_DCR_CS_MASK + | DMA_DCR_SSIZE(0) // 32-bit source transfers + | DMA_DCR_DSIZE(0); // 32-bit destination transfers + + dma->DMA[DMA_CHAN_START].DCR = DMA_DCR_EINT_MASK // enable interrupt on end of transfer + | DMA_DCR_ERQ_MASK + | DMA_DCR_D_REQ_MASK // clear ERQ on end of transfer + | DMA_DCR_SINC_MASK // increment source each transfer + | DMA_DCR_CS_MASK + | DMA_DCR_SSIZE(0) // 32-bit source transfers + | DMA_DCR_DSIZE(0); + + + tpm->SC |= TPM_SC_CMOD(1); // enable internal clocking +} + +void WS2811::writePixel(unsigned n, uint8_t *p) +{ + uint32_t *dest = dmaData.dmaWords + n * BITS_PER_RGB; + writeByte(*p++, pinMask, dest + 0); // G + writeByte(*p++, pinMask, dest + 8); // R + writeByte(*p, pinMask, dest + 16); // B +} + +// class static +void WS2811::writeByte(uint8_t byte, uint32_t mask, uint32_t *dest) +{ + for (uint8_t bm = 0x80; bm; bm >>= 1) + { + // MSBit first + if (byte & bm) + *dest |= mask; + else + *dest &= ~mask; + dest++; + } +} + +void WS2811::begin() +{ + blank(); + show(); +} + +void WS2811::blank() +{ + memset(pixels, 0x00, numPixelBytes()); + +#if DEBUG + for (unsigned i = DMA_LEADING_ZEROS; i < DMA_LEADING_ZEROS + BITS_PER_RGB; i++) + dmaData.dmaWords[i] = DEBUG_MASK; +#else + memset(dmaData.dmaWords, 0x00, sizeof(dmaData.dmaWords)); +#endif +} + +void WS2811::show() +{ + hw_init(); + + uint16_t i, n = numPixels(); // 3 bytes per LED + uint8_t *p = pixels; + while (guardtime.read_us() < 50) + { + __NOP(); + } + + for (i=0; i<n; i++ ) + { + writePixel(i, p); + p += 3; + } + + startDMA(); + + guardtime.reset(); +} + +extern "C" void DMA0_IRQHandler() +{ + DMA_Type volatile * dma = DMA0; + TPM_Type volatile *tpm = TPM0; + + uint32_t db = dma->DMA[DMA_CHAN_START].DSR_BCR; + if (db & DMA_DSR_BCR_DONE_MASK) + { + dma->DMA[DMA_CHAN_START].DSR_BCR = DMA_DSR_BCR_DONE_MASK; // clear/reset DMA status + } + + db = dma->DMA[DMA_CHAN_0_LOW].DSR_BCR; + if (db & DMA_DSR_BCR_DONE_MASK) + { + dma->DMA[DMA_CHAN_0_LOW].DSR_BCR = DMA_DSR_BCR_DONE_MASK; // clear/reset DMA status + } + + db = dma->DMA[DMA_CHAN_1_LOW].DSR_BCR; + if (db & DMA_DSR_BCR_DONE_MASK) + { + dma->DMA[DMA_CHAN_1_LOW].DSR_BCR = DMA_DSR_BCR_DONE_MASK; // clear/reset DMA status + dma_done = true; + tpm->SC &= ~TPM_SC_CMOD_MASK; // disable internal clocking + RESET_DEBUG; + } +} - dma_done = false; - - spi->C2 |= SPI_C2_TXDMAE_MASK; - - // wait until done - // while (!(DMA0->DMA[dmaWriteChannel].DSR_BCR & DMA_DSR_BCR_DONE_MASK)) - while (!dma_done) - __NOP(); - - spi->C2 &= ~SPI_C2_TXDMAE_MASK; - debugOut = 0; - - dump_spi_settings(spi); - -} - -void WS2811::writePixel(uint8_t *p) -{ - writeByte(*p++, dmaBytes + 0); - writeByte(*p++, dmaBytes + 16); - writeByte(*p, dmaBytes + 32); -// printf("DMA Bytes:\r\n"); -// for (int i = 0; i < sizeof(dmaBytes); i++) -// printf(" %02x", dmaBytes[i]); -// printf("\r\n"); - startDMA(); -} - -void WS2811::writeByte(uint8_t byte, uint8_t *dest) -{ - for (uint8_t mask = 0x80; mask; mask >>= 1) { - if (mask & byte) - *dest++ = 0xff; // 8 high - else - *dest++ = 0xe0; // 3 high, 5 low - *dest++ = 0x00; // 8 more low - } -} - -void WS2811::begin(void) -{ - blank(); - show(); -} - -void WS2811::blank(void) -{ - memset(pixels, 0x00, numPixelBytes()); -} - - -void WS2811::show(void) -{ - uint16_t i, n = numPixels(); // 3 bytes per LED - uint8_t *p = pixels; - while (guardtime.read_us() < 50) - __NOP(); - for (i=0; i<n; i++ ) { - writePixel(p); - pc.printf("%d> ", i); - pc.getc(); - p += 3; - } - guardtime.reset(); -} - -extern "C" void DMA0IntHandler() -{ - DMA0->DMA[dmaWriteChannel].DSR_BCR = DMA_DSR_BCR_DONE_MASK; // clear/reset DMA status - dma_done = true; -} -
--- a/WS2811.h Sat Dec 21 04:32:21 2013 +0000 +++ b/WS2811.h Thu Jan 02 00:50:09 2014 +0000 @@ -9,42 +9,50 @@ // Heavily modified by Jas Strong, 2012-10-04 // Changed to use a virtual base class and to use software SPI. +// +// Modified by Ned Konz, December 2013. +// Using three-phase DMA ala Paul Stoffegren's version. -#include "mbed.h" -#include "LedStrip.h" #ifndef MBED_WS2811_H #define MBED_WS2811_H -#ifdef TARGET_KL25Z -// SPI0 max frequency = fBUS/2 = 24MHz -// SPI1 max frequency = fSYS/2 = 12MHz -// but watch out for SPI1 errata using DMA! -// SPI0: PTA16, PTA17, PTC6, PTC7, PTD2, PTD3 -// SPI1: PTB16, PTB17, PTD6, PTD7, PTE1, PTE3 -#define MOSI_DEFAULT PTD2 -// SPI0: PTA15, PTC5, PTD1/ LED_BLUE -// SPI1: PTB11, PTD5, PTE2 -#define SCLK_DEFAULT PTD1 -#else -#endif +#include "mbed.h" +#include "LedStrip.h" + +#define MAX_LEDS_PER_STRIP 40 class WS2811 : public LedStrip { public: - WS2811(int n, SPI_Type *_spi, PinName mosi = MOSI_DEFAULT, PinName sclk = SCLK_DEFAULT); - virtual void begin(void); - virtual void show(void); - virtual void blank(void); + WS2811(unsigned n, unsigned pinNumber); + + virtual void begin(); + virtual void show(); + virtual void blank(); private: - SPI_Type *spi; - PinName mosi; - uint8_t dmaBytes[16*3]; // enough for DMA'ing 1 RGB LED + Timer guardtime; + uint32_t pinMask; + + void writePixel(unsigned n, uint8_t *p); - Timer guardtime; + // Class Static: + + static bool initialized; + static uint32_t enabledPins; + + static void writeByte(uint8_t byte, uint32_t mask, uint32_t *dest); + static void startDMA(); - void writePixel(uint8_t *p); - void writeByte(uint8_t byte, uint8_t *dest); - void startDMA(); + static bool is_dma_done(); + + static void hw_init(); + static void io_init(); + static void clock_init(); + static void dma_init(); + static void tpm_init(); + static void dma_data_init(); }; -#endif \ No newline at end of file + +#endif +
--- a/main.cpp Sat Dec 21 04:32:21 2013 +0000 +++ b/main.cpp Thu Jan 02 00:50:09 2014 +0000 @@ -1,72 +1,74 @@ -#include "mbed.h" -#include "WS2811.h" -#include "Colors.h" - -const unsigned nLEDs = 60*4; - -const PinName dataOutput = PTD2; -const PinName sckOutput = PTD1; -SPI_Type *spiPort = SPI0; - -DigitalOut debugOut(PTD3); -Serial pc(USBTX, USBRX); +#include "mbed.h" +#include "WS2811.h" +#include "Colors.h" + +// per LED: 3x 20 mA = 60mA +// 4x full brightness = 0.33A at 5V. +unsigned const nLEDs = 40; + +// I/O pin usage +// PTD0 TPM0 CH0 monitor +// PTD1 TPM0 CH1 monitor +// PTD2 data output +// PTD3 debug output + +unsigned const DATA_OUT_PIN = 2; // PTD2 + +Serial pc(USBTX, USBRX); + +// @brief sets different colors in each of the LEDs of a strip +// @param strip the light strip +// @param sat saturation, 0.0 - 1.0 +// @param brite brightness, 0.0 - 1.0 +// @param hueShift shift, 0.0 - 1.0 is equivalent to 0 - 360 degrees +void showRainbow(WS2811 &strip, float sat, float brite, float hueShift) +{ + unsigned nLEDs = strip.numPixels(); + for (unsigned i = 0; i < nLEDs; i++) { + uint8_t r, g, b; + float hue = ((float)i / (float)nLEDs) + hueShift; + HSBtoRGB(hue, sat, brite, &r, &g, &b); + strip.setPixelColor(i, LedStrip::Color(r, g, b)); + } + strip.show(); +} + +void showTestPattern(WS2811 &strip) +{ + unsigned nLEDs = strip.numPixels(); + for (unsigned i = 0; i < nLEDs; i++) + { + strip.setPixelColor(i, LedStrip::Color(0xff,0,0xAA)); + } + strip.show(); +} + +int main(void) +{ + pc.baud(115200); + pc.printf("\r\nLEDs: %d\r\n", nLEDs); + + WS2811 lightStrip(nLEDs, DATA_OUT_PIN); + Timer advance; + advance.start(); + + lightStrip.begin(); + + // time per LED is about 44 usec, with 310 usec gap between. + float sat = 1.0; + float brite = 0.25; + float hueShift = 0.0; + float hueShiftIncrement = 1.0 / (360.0 / nLEDs); + + for (;;) { + advance.reset(); + + // showTestPattern(lightStrip); + showRainbow(lightStrip, sat, brite, hueShift); + hueShift += hueShiftIncrement; + + while (advance.read_ms() < 100) + __NOP(); + } +} -// @brief sets different colors in each of the LEDs of a strip -// @param strip the light strip -// @param sat saturation, 0.0 - 1.0 -// @param brite brightness, 0.0 - 1.0 -// @param hueShift shift, 0.0 - 1.0 is equivalent to 0 - 360 degrees -void showRainbow(WS2811 &strip, float sat, float brite, float hueShift) -{ - unsigned nLEDs = strip.numPixels(); - for (unsigned i = 0; i < nLEDs; i++) { - uint8_t r, g, b; - float hue = ((float)i / (float)nLEDs) + hueShift; - HSBtoRGB(hue, sat, brite, &r, &g, &b); - strip.setPixelColor(i, LedStrip::Color(r, g, b)); - } - strip.begin(); -} -void showTestPattern(WS2811 &strip) -{ - unsigned nLEDs = strip.numPixels(); - for (unsigned i = 0; i < nLEDs; i++) { - strip.setPixelColor(i, LedStrip::Color(0xff,0,0x55)); - } - strip.show(); -} -void dump_spi_settings(SPI_Type const *spi) -{ - pc.printf("SPI C1=%#02x, C2=%#02x, BR=%d, S=%#02x, D=%#02x, M=%02x\r\n", spi->C1, spi->C2, spi->BR, spi->S, spi->D, spi->M); - pc.printf("DMA DSR_BCR=%#08lx, SAR=%p, DAR=%p, DCR=%#08lx\r\n", - (unsigned long)DMA0->DMA[0].DSR_BCR, - DMA0->DMA[0].SAR, - DMA0->DMA[0].DAR, - DMA0->DMA[0].DCR); -} - -int main(void) -{ - pc.baud(115200); - pc.printf("LEDs: %d\r\n", nLEDs); - debugOut = 0; - - // NLEDs MOSI SCK - WS2811 lightStrip(nLEDs, spiPort, dataOutput, sckOutput); - - lightStrip.begin(); - dump_spi_settings(spiPort); - - // float sat = 1.0; - // float brite = 0.25; - // float hueShift = 0.0; - // float hueShiftIncrement = 1.0 / (360.0 / 30.0); - for (;;) { - // debugOut = 1; - // showRainbow(lightStrip, sat, brite, hueShift); - showTestPattern(lightStrip); - - // debugOut = 0; - // hueShift += hueShiftIncrement; - } -} \ No newline at end of file