commiting examples
This commit is contained in:
Nicolas Trimborn
415
Examples/NeoPixel Example/NeoPixel.c
Normal file
415
Examples/NeoPixel Example/NeoPixel.c
Normal file
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#include <samd21g18a.h>
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#include "NeoPixel.h"
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#include "Timer.h"
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#include "DMA.h"
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#include "SPI.h"
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#include "ADC.h"
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static uint8_t pixel_buffer[NUM_PIXELS * 3]; // 3 bytes per pixel (G-R-B)
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static uint8_t dma_buffer[NUM_PIXELS * 3 * 3 + 90]; // each byte is expanded to 3 bytes + 90 bytes (zero) for latching
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static const uint32_t bit_expand[256]; // lookup table for bit expansion
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static Animation current_animation;
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static int frame;
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void NeoPixel_init(void)
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{
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/* initialize pixel buffer */
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NeoPixel_clear_pixels();
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/* initialize DMA buffer */
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for (int i = 0 ; i < sizeof dma_buffer ; i++)
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dma_buffer[i] = 0x00;
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/* configure and enable DMA controller */
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/* set up transfer descriptor */
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DmacDescriptor descriptor;
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descriptor.DSTADDR.reg = (uint32_t)&SERCOM0->SPI.DATA; // destination address is SPI DATA register
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descriptor.SRCADDR.reg = (uint32_t)(dma_buffer + sizeof dma_buffer); // source address is the DMA buffer
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descriptor.DESCADDR.reg = 0; // only one transfer descriptor
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descriptor.BTCTRL.bit.BEATSIZE = DMAC_BTCTRL_BEATSIZE_BYTE_Val; // beat size is one byte
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descriptor.BTCTRL.bit.DSTINC = 0; // destination address increment disabled
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descriptor.BTCTRL.bit.SRCINC = 1; // source address increment enabled
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descriptor.BTCTRL.bit.STEPSEL = DMAC_BTCTRL_STEPSEL_SRC_Val; // flexible source address increment size
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descriptor.BTCTRL.bit.STEPSIZE = DMAC_BTCTRL_STEPSIZE_X1_Val; // source address increment is one byte
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descriptor.BTCTRL.bit.BLOCKACT = DMAC_BTCTRL_BLOCKACT_NOACT_Val; // request interrupt at end of block transfer
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descriptor.BTCNT.reg = sizeof dma_buffer; // beat count
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descriptor.BTCTRL.bit.VALID = 1; // descriptor is valid
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/* initialize DMA controller */
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DMA_init();
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/* add and enable SERCOM0 (SPI) channel */
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DMA_add_channel(DMA_SOURCE_SERCOM0, &descriptor);
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/* enable DMA */
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DMA_enable();
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/* initialize timer */
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Timer_init();
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/* initialize SPI */
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SPI_init();
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}
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/* set pixel color (pixel are numbered from 0 to NUM_PIXELS - 1) */
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void NeoPixel_set_pixel(int pixel, uint8_t red, uint8_t green, uint8_t blue)
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{
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if (pixel < 0 || pixel >= NUM_PIXELS)
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return;
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int n = pixel * 3;
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pixel_buffer[n] = green;
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pixel_buffer[n + 1] = red;
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pixel_buffer[n + 2] = blue;
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}
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/* all pixels off */
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void NeoPixel_clear_pixels(void)
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{
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for (int i = 0 ; i < NUM_PIXELS * 3 ; i++)
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pixel_buffer[i] = 0;
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}
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/* update DMA buffer */
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void NeoPixel_update(void)
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{
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for (int i = 0, j = 0 ; i < sizeof pixel_buffer ; i++, j += 3)
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{
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uint32_t expanded = bit_expand[pixel_buffer[i]];
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dma_buffer[j] = expanded >> 16;
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dma_buffer[j + 1] = expanded >> 8;
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dma_buffer[j + 2] = expanded;
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}
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}
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void NeoPixel_update_animation(void)
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{
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static int v = 1;
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static int on = 0;
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int sound_value = 0;
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if (frame_time) // if all DMA transfers for a frame has occurred
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{
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frame_time = 0; // acknowledge/clear flag from timer
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/* update pixel buffer */
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switch (current_animation)
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{
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case KITT:
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NeoPixel_clear_pixels();
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NeoPixel_set_pixel(frame, 255, 0, 0);
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NeoPixel_set_pixel(frame - v, 255, 0, 0);
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NeoPixel_set_pixel(frame - 2*v, 200, 0, 0);
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NeoPixel_set_pixel(frame - 3*v, 100, 0, 0);
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NeoPixel_set_pixel(frame - 4*v, 50, 0, 0);
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if (frame == NUM_PIXELS - 1 || frame == 0)
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v = -v;
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frame += v;
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break;
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case BREATHING:
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for (int i = 0 ; i < NUM_PIXELS ; i++)
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NeoPixel_set_pixel(i, 0 , 0, frame*4);
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if (frame == 63 || frame == 0)
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v = -v;
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frame += v;
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break;
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case BLINK:
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if (!(frame++ % 20))
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if (!on)
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{
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on = 1;
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for (int i = 0 ; i < NUM_PIXELS ; i++)
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NeoPixel_set_pixel(i, 0, 255, 0);
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}
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else
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{
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on = 0;
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NeoPixel_clear_pixels();
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}
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break;
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case SOUND:
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#define THRESHOLD 200
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if (adc_value < THRESHOLD) // threshold
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sound_value = 0;
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else
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sound_value = (adc_value - THRESHOLD) * ((255.0 - 0.0)/(400.0 - THRESHOLD)); // linear map: y = (x - x1) * (y2 - y1)/(x2 - x1)
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if (sound_value >= 255)
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sound_value = 255;
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for (int i = 0 ; i < NUM_PIXELS ; i++)
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NeoPixel_set_pixel(i, sound_value, sound_value, 0);
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break;
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default:
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break;
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}
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/* send frame to DMA buffer */
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NeoPixel_update();
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}
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}
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void NeoPixel_set_animation(Animation animation)
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{
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current_animation = animation;
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if (animation == SOUND)
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ADC_init();
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else
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ADC_deinit();
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frame = 1;
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NeoPixel_clear_pixels();
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}
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/* bit expansion lookup table */
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static const uint32_t bit_expand[256] = {
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0b100100100100100100100100,
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0b100100100100100100100110,
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0b100100100100100100110100,
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0b100100100100100100110110,
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0b100100100100100110100100,
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0b100100100100100110100110,
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0b100100100100100110110100,
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0b100100100100100110110110,
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0b100100100100110100100100,
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0b100100100100110100100110,
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0b100100100100110100110100,
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0b100100100100110100110110,
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0b100100100100110110100100,
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0b100100100100110110100110,
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0b100100100100110110110100,
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0b100100100100110110110110,
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0b100100100110100100100100,
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0b100100100110100100100110,
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0b100100100110100100110100,
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0b100100100110100100110110,
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0b100100100110100110100100,
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0b100100100110100110100110,
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0b100100100110100110110100,
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0b100100100110100110110110,
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0b100100100110110100100100,
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0b100100100110110100100110,
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0b100100100110110100110100,
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0b100100100110110100110110,
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0b100100100110110110100100,
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0b100100100110110110100110,
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0b100100100110110110110100,
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0b100100100110110110110110,
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0b100100110100100100100100,
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0b100100110100100100100110,
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0b100100110100100100110100,
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0b100100110100100100110110,
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0b100100110100100110100100,
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0b100100110100100110100110,
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0b100100110100100110110100,
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0b100100110100100110110110,
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0b100100110100110100100100,
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0b100100110100110100100110,
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0b100100110100110100110100,
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0b100100110100110100110110,
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0b100100110100110110100100,
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0b100100110100110110100110,
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0b100100110100110110110100,
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0b100100110100110110110110,
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0b100100110110100100100100,
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0b100100110110100100100110,
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0b100100110110100100110100,
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0b100100110110100100110110,
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0b100100110110100110100100,
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0b100100110110100110100110,
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0b100100110110100110110100,
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0b100100110110100110110110,
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0b100100110110110100100100,
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0b100100110110110100100110,
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0b100100110110110100110100,
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0b100100110110110100110110,
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0b100100110110110110100100,
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0b100100110110110110100110,
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0b100100110110110110110100,
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0b100100110110110110110110,
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0b100110100100100100100100,
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0b100110100100100100100110,
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0b100110100100100100110100,
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0b100110100100100100110110,
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0b100110100100100110100100,
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0b100110100100100110100110,
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0b100110100100100110110100,
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0b100110100100100110110110,
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0b100110100100110100100100,
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0b100110100100110100100110,
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0b100110100100110100110100,
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0b100110100100110100110110,
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0b100110100100110110100100,
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0b100110100100110110100110,
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0b100110100100110110110100,
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0b100110100100110110110110,
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0b100110100110100100100100,
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0b100110100110100100100110,
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0b100110100110100100110100,
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0b100110100110100100110110,
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0b100110100110100110100100,
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0b100110100110100110100110,
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0b100110100110100110110100,
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0b100110100110100110110110,
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0b100110100110110100100100,
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0b100110100110110100100110,
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0b100110100110110100110100,
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0b100110100110110100110110,
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0b100110100110110110100100,
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0b100110100110110110100110,
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0b100110100110110110110100,
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0b100110100110110110110110,
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0b100110110100100100100100,
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0b100110110100100100100110,
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0b100110110100100100110100,
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0b100110110100100100110110,
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0b100110110100100110100100,
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0b100110110100100110100110,
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0b100110110100100110110100,
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0b100110110100100110110110,
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0b100110110100110100100100,
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0b100110110100110100100110,
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0b100110110100110100110100,
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0b100110110100110100110110,
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0b100110110100110110100100,
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0b100110110100110110100110,
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0b100110110100110110110100,
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0b100110110100110110110110,
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0b100110110110100100100100,
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0b100110110110100100100110,
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0b100110110110100100110100,
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0b100110110110100100110110,
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0b100110110110100110100100,
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0b100110110110100110100110,
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0b100110110110100110110100,
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0b100110110110100110110110,
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0b100110110110110100100100,
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0b100110110110110100100110,
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0b100110110110110100110100,
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0b100110110110110100110110,
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0b100110110110110110100100,
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0b100110110110110110100110,
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0b100110110110110110110100,
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0b100110110110110110110110,
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0b110100100100100100100100,
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0b110100100100100100100110,
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0b110100100100100100110100,
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0b110100100100100100110110,
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0b110100100100100110100100,
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0b110100100100100110100110,
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0b110100100100100110110100,
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0b110100100100100110110110,
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0b110100100100110100100100,
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0b110100100100110100100110,
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0b110100100100110100110100,
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0b110100100100110100110110,
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0b110100100100110110100100,
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0b110100100100110110100110,
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0b110100100100110110110100,
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0b110100100100110110110110,
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0b110100100110100100100100,
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0b110100100110100100100110,
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0b110100100110100100110100,
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0b110100100110100100110110,
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0b110100100110100110100100,
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0b110100100110100110100110,
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0b110100100110100110110100,
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0b110100100110100110110110,
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0b110100100110110100100100,
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0b110100100110110100100110,
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0b110100100110110100110100,
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0b110100100110110100110110,
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0b110100100110110110100100,
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0b110100100110110110100110,
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0b110100100110110110110100,
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0b110100100110110110110110,
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0b110100110100100100100100,
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0b110100110100100100100110,
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0b110100110100100100110100,
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0b110100110100100100110110,
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0b110100110100100110100100,
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0b110100110100100110100110,
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0b110100110100100110110100,
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0b110100110100100110110110,
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0b110100110100110100100100,
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0b110100110100110100100110,
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0b110100110100110100110100,
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0b110100110100110100110110,
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0b110100110100110110100100,
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0b110100110100110110100110,
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0b110100110100110110110100,
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0b110100110100110110110110,
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0b110100110110100100100100,
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0b110100110110100100100110,
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0b110100110110100100110100,
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0b110100110110100100110110,
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0b110100110110100110100100,
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0b110100110110100110100110,
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0b110100110110100110110100,
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0b110100110110100110110110,
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0b110100110110110100100100,
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0b110100110110110100100110,
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0b110100110110110100110100,
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0b110100110110110100110110,
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0b110100110110110110100100,
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0b110100110110110110100110,
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0b110100110110110110110100,
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0b110100110110110110110110,
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0b110110100100100100100100,
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0b110110100100100100100110,
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0b110110100100100100110100,
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0b110110100100100100110110,
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0b110110100100100110100100,
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0b110110100100100110100110,
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0b110110100100100110110100,
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0b110110100100100110110110,
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0b110110100100110100100100,
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0b110110100100110100100110,
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||||
0b110110100100110100110100,
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0b110110100100110100110110,
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0b110110100100110110100100,
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||||
0b110110100100110110100110,
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||||
0b110110100100110110110100,
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0b110110100100110110110110,
|
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0b110110100110100100100100,
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0b110110100110100100100110,
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0b110110100110100100110100,
|
||||
0b110110100110100100110110,
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||||
0b110110100110100110100100,
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||||
0b110110100110100110100110,
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||||
0b110110100110100110110100,
|
||||
0b110110100110100110110110,
|
||||
0b110110100110110100100100,
|
||||
0b110110100110110100100110,
|
||||
0b110110100110110100110100,
|
||||
0b110110100110110100110110,
|
||||
0b110110100110110110100100,
|
||||
0b110110100110110110100110,
|
||||
0b110110100110110110110100,
|
||||
0b110110100110110110110110,
|
||||
0b110110110100100100100100,
|
||||
0b110110110100100100100110,
|
||||
0b110110110100100100110100,
|
||||
0b110110110100100100110110,
|
||||
0b110110110100100110100100,
|
||||
0b110110110100100110100110,
|
||||
0b110110110100100110110100,
|
||||
0b110110110100100110110110,
|
||||
0b110110110100110100100100,
|
||||
0b110110110100110100100110,
|
||||
0b110110110100110100110100,
|
||||
0b110110110100110100110110,
|
||||
0b110110110100110110100100,
|
||||
0b110110110100110110100110,
|
||||
0b110110110100110110110100,
|
||||
0b110110110100110110110110,
|
||||
0b110110110110100100100100,
|
||||
0b110110110110100100100110,
|
||||
0b110110110110100100110100,
|
||||
0b110110110110100100110110,
|
||||
0b110110110110100110100100,
|
||||
0b110110110110100110100110,
|
||||
0b110110110110100110110100,
|
||||
0b110110110110100110110110,
|
||||
0b110110110110110100100100,
|
||||
0b110110110110110100100110,
|
||||
0b110110110110110100110100,
|
||||
0b110110110110110100110110,
|
||||
0b110110110110110110100100,
|
||||
0b110110110110110110100110,
|
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0b110110110110110110110100,
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0b110110110110110110110110
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};
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