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https://github.com/Hopiu/rpi-rgb-led-matrix.git
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126 lines
5.5 KiB
C++
126 lines
5.5 KiB
C++
// -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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// Copyright (C) 2013 Henner Zeller <h.zeller@acm.org>
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation version 2.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://gnu.org/licenses/gpl-2.0.txt>
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#ifndef RPI_RGBMATRIX_FRAMEBUFFER_INTERNAL_H
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#define RPI_RGBMATRIX_FRAMEBUFFER_INTERNAL_H
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#include <stdint.h>
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namespace rgb_matrix {
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class GPIO;
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namespace internal {
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// Internal representation of the frame-buffer that as well can
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// write itself to GPIO.
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// Our internal memory layout mimicks as much as possible what needs to be
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// written out.
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class Framebuffer {
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public:
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Framebuffer(int rows, int columns, int parallel);
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~Framebuffer();
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// Initialize GPIO bits for output.
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void InitGPIO(GPIO *io);
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// Set PWM bits used for output. Default is 11, but if you only deal with
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// simple comic-colors, 1 might be sufficient. Lower require less CPU.
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// Returns boolean to signify if value was within range.
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bool SetPWMBits(uint8_t value);
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uint8_t pwmbits() { return pwm_bits_; }
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// Map brightness of output linearly to input with CIE1931 profile.
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void set_luminance_correct(bool on) { do_luminance_correct_ = on; }
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bool luminance_correct() const { return do_luminance_correct_; }
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void DumpToMatrix(GPIO *io);
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// Canvas-inspired methods, but we're not implementing this interface to not
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// have an unnecessary vtable.
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inline int width() const { return columns_; }
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inline int height() const { return height_; }
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void SetPixel(int x, int y, uint8_t red, uint8_t green, uint8_t blue);
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void Clear();
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void Fill(uint8_t red, uint8_t green, uint8_t blue);
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private:
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// Map color
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inline uint16_t MapColor(uint8_t c);
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const int rows_; // Number of rows. 16 or 32.
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const int parallel_; // Parallel rows of chains. 1 or 2.
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const int height_; // rows * parallel
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const int columns_; // Number of columns. Number of chained boards * 32.
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uint8_t pwm_bits_; // PWM bits to display.
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bool do_luminance_correct_;
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const int double_rows_;
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const uint8_t row_mask_;
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union IoBits {
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struct {
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// This bitset reflects the GPIO mapping. The naming of the
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// pins of type 'p0_r1' means 'first parallel chain, red-bit one'
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#ifdef SUPPORT_MULTI_PARALLEL
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unsigned int unused_0_1 : 2; // 0..1 (only on RPi 1, Revision 1)
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unsigned int p2_g1 : 1; // 2 (masks SDA when parallel=3)
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unsigned int p2_b1 : 1; // 3 (masks SCL when parallel=3)
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#else
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// The Revision1 and Revision2 boards have different GPIO mappings
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// on the pins 2 and 3. Just use both interpretations.
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// To keep the I2C pins free, we don't use these anymore.
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// We keep this backward compatible unless SUPPORT_MULTI_PARALLEL
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// is explicitly chosen.
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unsigned int output_enable_rev1 : 1; // 0 (RPi 1, Revision 1)
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unsigned int clock_rev1 : 1; // 1 (RPi 1, Revision 1)
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unsigned int output_enable_rev2 : 1; // 2 (Pi1.Rev2; masks: I2C SDA)
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unsigned int clock_rev2 : 1; // 3 (Pi1.Rev2; masks: I2C SCL)
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#endif
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unsigned int strobe : 1; // 4
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unsigned int p1_g1 : 1; // 5 (only on A+/B+/Pi2)
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unsigned int p1_b1 : 1; // 6 (only on A+/B+/Pi2)
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unsigned int row : 4; // 7..10 (masks: some of SPI_0)
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unsigned int clock : 1; // 11 (masks: SCKL of SPI_0)
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unsigned int p1_r1 : 1; // 12 (only on A+/B+/Pi2)
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unsigned int p1_g2 : 1; // 13 (only on A+/B+/Pi2)
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unsigned int p2_r1 : 1; // 14 (masks TxD when parallel=3)
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unsigned int p2_r2 : 1; // 15 (masks RxD when parallel=3)
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unsigned int unused_16 : 1; // 16 (only on A+/B+/Pi2)
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unsigned int p0_r1 : 1; // 17
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unsigned int p0_g1 : 1; // 18
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unsigned int p1_r2 : 1; // 19 (only on A+/B+/Pi2)
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unsigned int p1_b2 : 1; // 20 (only on A+/B+/Pi2)
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unsigned int p2_b2 : 1; // 21 (only on A+/B+/Pi2)
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unsigned int p0_b1 : 1; // 22
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unsigned int p0_r2 : 1; // 23
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unsigned int p0_g2 : 1; // 24
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unsigned int p0_b2 : 1; // 25
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unsigned int p2_g2 : 1; // 26 (only on A+/B+/Pi2)
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unsigned int output_enable : 1; // 27 (Not on RPi1, Rev1)
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} bits;
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uint32_t raw;
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IoBits() : raw(0) {}
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};
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// The frame-buffer is organized in bitplanes.
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// Highest level (slowest to cycle through) are double rows.
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// For each double-row, we store pwm-bits columns of a bitplane.
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// Each bitplane-column is pre-filled IoBits, of which the colors are set.
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// Of course, that means that we store unrelated bits in the frame-buffer,
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// but it allows easy access in the critical section.
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IoBits *bitplane_buffer_;
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inline IoBits *ValueAt(int double_row, int column, int bit);
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};
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} // namespace internal
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} // namespace rgb_matrix
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#endif // RPI_RGBMATRIX_FRAMEBUFFER_INTERNAL_H
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