matrix implementation
Máximo Cuadros
8 years ago
parent
fd15458b4b
commit
58fa88515e
@ -1,112 +1,184 @@
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package main
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package rgbmatrix
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/*
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#cgo CFLAGS: -std=c99 -Ivendor/rpi-rgb-led-matrix/include -DSHOW_REFRESH_RATE
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#cgo LDFLAGS: -lrgbmatrix -Lvendor/rpi-rgb-led-matrix/lib -lstdc++ -lm
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#cgo CFLAGS: -std=c99 -I${SRCDIR}/vendor/rpi-rgb-led-matrix/include -DSHOW_REFRESH_RATE
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#cgo LDFLAGS: -lrgbmatrix -L${SRCDIR}/vendor/rpi-rgb-led-matrix/lib -lstdc++ -lm
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#include <led-matrix-c.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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struct RGBLedMatrix *matrix;
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struct LedCanvas *offscreen_canvas;
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void setCanvas(struct LedCanvas *offscreen_canvas, const uint32_t pixels[]) {
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void led_matrix_swap(struct LedCanvas *offscreen_canvas,
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int width, int height, const uint32_t pixels[]) {
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int i, x, y;
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uint32_t color;
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for (y = 0; y < 32; ++y) {
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for (x = 0; x < 64; ++x) {
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for (y = 0; y < height; ++y) {
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for (x = 0; x < width; ++x) {
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i = x + (y * 64);
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color = pixels[i];
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led_canvas_set_pixel(offscreen_canvas, x, y,
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(color >> 16) & 255, (color >> 8) & 255, color & 255);
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}
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}
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}
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int example(struct RGBLedMatrixOptions *options) {
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struct LedCanvas *offscreen_canvas;
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int width, height;
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int x, y, i;
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matrix = led_matrix_create_from_options(options, NULL, NULL);
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if (matrix == NULL)
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return 1;
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offscreen_canvas = led_matrix_create_offscreen_canvas(matrix);
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led_canvas_get_size(offscreen_canvas, &width, &height);
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fprintf(stderr, "Size: %dx%d. Hardware gpio mapping: %s\n",
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width, height, options->hardware_mapping);
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for (i = 0; i < 1000; ++i) {
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for (y = 0; y < height; ++y) {
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for (x = 0; x < width; ++x) {
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led_canvas_set_pixel(offscreen_canvas, x, y, i & 0xff, x, y);
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}
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}
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offscreen_canvas = led_matrix_swap_on_vsync(matrix, offscreen_canvas);
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}
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led_matrix_delete(matrix);
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return 0;
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}
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*/
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import "C"
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import (
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"fmt"
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"image/color"
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"time"
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"unsafe"
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)
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func main() {
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o := &C.struct_RGBLedMatrixOptions{}
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o.rows = 32
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o.chain_length = 2
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// DefaultConfig default WS281x configuration
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var DefaultConfig = HardwareConfig{
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Rows: 32,
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ChainLength: 1,
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Parallel: 1,
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PWMBits: 11,
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PWMLSBNanoseconds: 130,
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Brightness: 100,
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ScanMode: Progressive,
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}
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s := time.Now()
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C.example(o)
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fmt.Println(time.Since(s))
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// HardwareConfig rgb-led-matrix configuration
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type HardwareConfig struct {
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// Rows the number of rows supported by the display, so 32 or 16.
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Rows int
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// ChainLengthis the number of displays daisy-chained together
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// (output of one connected to input of next).
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ChainLength int
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// Parallel is the number of parallel chains connected to the Pi; in old Pis
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// with 26 GPIO pins, that is 1, in newer Pis with 40 interfaces pins, that
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// can also be 2 or 3. The effective number of pixels in vertical direction is
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// then thus rows * parallel.
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Parallel int
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// Set PWM bits used for output. Default is 11, but if you only deal with
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// limited comic-colors, 1 might be sufficient. Lower require less CPU and
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// increases refresh-rate.
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PWMBits int
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// Change the base time-unit for the on-time in the lowest significant bit in
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// nanoseconds. Higher numbers provide better quality (more accurate color,
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// less ghosting), but have a negative impact on the frame rate.
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PWMLSBNanoseconds int // the DMA channel to use
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// Brightness is the initial brightness of the panel in percent. Valid range
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// is 1..100
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Brightness int
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// ScanMode progressive or interlaced
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ScanMode ScanMode // strip color layout
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// Disable the PWM hardware subsystem to create pulses. Typically, you don't
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// want to disable hardware pulsing, this is mostly for debugging and figuring
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// out if there is interference with the sound system.
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// This won't do anything if output enable is not connected to GPIO 18 in
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// non-standard wirings.
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DisableHardwarePulsing bool
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ShowRefreshRate bool
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InverseColors bool
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}
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s = time.Now()
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example(o)
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fmt.Println(time.Since(s))
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func (c *HardwareConfig) geometry() (width, height int) {
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return c.Rows * c.ChainLength, c.Rows
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}
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func (c *HardwareConfig) toC() *C.struct_RGBLedMatrixOptions {
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o := &C.struct_RGBLedMatrixOptions{}
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o.rows = C.int(c.Rows)
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o.chain_length = C.int(c.ChainLength)
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o.parallel = C.int(c.Parallel)
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o.pwm_bits = C.int(c.PWMBits)
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o.pwm_lsb_nanoseconds = C.int(c.PWMLSBNanoseconds)
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o.brightness = C.int(c.Brightness)
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o.scan_mode = C.int(c.ScanMode)
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// o.disable_hardware_pulsing = c.DisableHardwarePulsing
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// o.show_refresh_rate = c.ShowRefreshRate
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// o.inverse_colors = c.InverseColors
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return o
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}
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func example(o *C.struct_RGBLedMatrixOptions) {
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matrix := C.led_matrix_create_from_options(o, nil, nil)
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if matrix == nil {
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panic("jodido")
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}
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type ScanMode int8
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const (
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Progressive ScanMode = 0
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Interlaced ScanMode = 1
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)
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//offscreen := C.led_matrix_create_offscreen_canvas(matrix)
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for i := 1; i < 1000; i++ {
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p := make([]C.uint32_t, 2048)
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for y := 0; y < 32; y++ {
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for x := 0; x < 64; x++ {
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pos := x + (y * 64)
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// RGBLedMatrix matrix representation for ws281x
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type RGBLedMatrix struct {
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Config *HardwareConfig
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c := color.RGBA{uint8(i & 0xff), uint8(x), uint8(y), 0}
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p[pos] = C.uint32_t(colorToUint32(c))
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}
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height int
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width int
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matrix *C.struct_RGBLedMatrix
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leds []C.uint32_t
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}
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// NewRGBLedMatrix returns a new matrix using the given size and config
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func NewRGBLedMatrix(config *HardwareConfig) (Matrix, error) {
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w, h := config.geometry()
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c := &RGBLedMatrix{
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Config: config,
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width: w, height: h,
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matrix: C.led_matrix_create_from_options(config.toC(), nil, nil),
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leds: make([]C.uint32_t, 2048),
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}
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C.setCanvas(matrix, (*C.uint32_t)(unsafe.Pointer(&p[0])))
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//offscreen = C.led_matrix_swap_on_vsync(matrix, offscreen)
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if c.matrix == nil {
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return nil, fmt.Errorf("unable to allocate memory")
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}
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C.led_matrix_delete(matrix)
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return c, nil
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}
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// Initialize initialize library, must be called once before other functions are
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// called.
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func (c *RGBLedMatrix) Initialize() error {
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return nil
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}
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// Geometry returns the width and the height of the matrix
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func (c *RGBLedMatrix) Geometry() (width, height int) {
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return c.width, c.height
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}
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// Render update the display with the data from the LED buffer
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func (c *RGBLedMatrix) Render() error {
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C.led_matrix_swap(
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c.matrix,
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C.int(64), C.int(32),
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(*C.uint32_t)(unsafe.Pointer(&c.leds[0])),
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)
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return nil
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}
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// At return an Color which allows access to the LED display data as
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// if it were a sequence of 24-bit RGB values.
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func (c *RGBLedMatrix) At(position int) color.Color {
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return uint32ToColor(c.leds[position])
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}
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// Set set LED at position x,y to the provided 24-bit color value.
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func (c *RGBLedMatrix) Set(position int, color color.Color) {
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c.leds[position] = C.uint32_t(colorToUint32(color))
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}
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// Close finalizes the ws281x interface
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func (c *RGBLedMatrix) Close() error {
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C.led_matrix_delete(c.matrix)
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return nil
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}
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func colorToUint32(c color.Color) uint32 {
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// A color's RGBA method returns values in the range [0, 65535]
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red, green, blue, _ := c.RGBA()
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// r<<16 | g<<8 | b
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return (red>>8)<<16 | (green>>8)<<8 | blue>>8
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}
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func uint32ToColor(u C.uint32_t) color.Color {
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return color.RGBA{
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uint8(u>>16) & 255,
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uint8(u>>8) & 255,
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uint8(u>>0) & 255,
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0,
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}
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}
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