kopia lustrzana https://github.com/pimoroni/pimoroni-pico
273 wiersze
9.7 KiB
C++
273 wiersze
9.7 KiB
C++
#include "hardware/dma.h"
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#include "hardware/irq.h"
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#include "common/pimoroni_common.hpp"
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#include "pico_unicorn.pio.h"
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#include "pico_unicorn.hpp"
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// pixel data is stored as a stream of bits delivered in the
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// order the PIO needs to manage the shift registers, row
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// selects, delays, and latching/blanking
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//
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// the data consists of 7 rows each of which has 14 frames of
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// bcd timing data
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//
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// each row looks like this:
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//
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// 0b00000000, 0b00000000, 0b00000000, 0b00000000, 0b00000000, 0b00000000, 0b00000000, 0b00000000, # pixel data
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// 0b00000000, # dummy byte to 32-bit align the frame (could be used to extend row select in future)
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// 0b01111111, # row 0 select (7-bit row address, 1-bit dummy data)
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// 0b00001111, 0b11111111, # bcd tick count (0-65536)
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//
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// .. next BCD frame for this row (repeat for 14 frames)
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//
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// .. next row (repeat for 7 rows)
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//
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// pixels are encoded as 4 bits: r, g, b, dummy to conveniently
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// pack them into nibbles
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enum pin {
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LED_DATA = 8,
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LED_CLOCK = 9,
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LED_LATCH = 10,
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LED_BLANK = 11,
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ROW_0 = 22,
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ROW_1 = 21,
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ROW_2 = 20,
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ROW_3 = 19,
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ROW_4 = 18,
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ROW_5 = 17,
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ROW_6 = 16,
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A = 12,
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B = 13,
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X = 14,
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Y = 15,
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};
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constexpr uint32_t ROW_COUNT = 7;
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constexpr uint32_t ROW_BYTES = 12;
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constexpr uint32_t BCD_FRAMES = 15; // includes fet discharge frame
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constexpr uint32_t BITSTREAM_LENGTH = (ROW_COUNT * ROW_BYTES * BCD_FRAMES);
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// must be aligned for 32bit dma transfer
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alignas(4) static uint8_t bitstream[BITSTREAM_LENGTH] = {0};
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static uint32_t dma_channel;
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static inline void unicorn_jetpack_program_init(PIO pio, uint sm, uint offset) {
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pio_gpio_init(pio, pin::LED_DATA);
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pio_gpio_init(pio, pin::LED_CLOCK);
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pio_gpio_init(pio, pin::LED_LATCH);
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pio_gpio_init(pio, pin::LED_BLANK);
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pio_gpio_init(pio, pin::ROW_0);
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pio_gpio_init(pio, pin::ROW_1);
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pio_gpio_init(pio, pin::ROW_2);
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pio_gpio_init(pio, pin::ROW_3);
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pio_gpio_init(pio, pin::ROW_4);
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pio_gpio_init(pio, pin::ROW_5);
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pio_gpio_init(pio, pin::ROW_6);
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pio_sm_set_consecutive_pindirs(pio, sm, pin::LED_DATA, 4, true);
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pio_sm_set_consecutive_pindirs(pio, sm, pin::ROW_6, 7, true);
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pio_sm_config c = unicorn_program_get_default_config(offset);
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// osr shifts right, autopull on, autopull threshold 8
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sm_config_set_out_shift(&c, true, false, 32);
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// configure out, set, and sideset pins
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sm_config_set_out_pins(&c, pin::ROW_6, 7);
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sm_config_set_sideset_pins(&c, pin::LED_CLOCK);
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sm_config_set_set_pins(&c, pin::LED_DATA, 4);
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// join fifos as only tx needed (gives 8 deep fifo instead of 4)
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sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
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pio_sm_init(pio, sm, offset, &c);
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pio_sm_set_enabled(pio, sm, true);
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}
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namespace pimoroni {
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// once the dma transfer of the scanline is complete we move to the
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// next scanline (or quit if we're finished)
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void __isr dma_complete() {
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if (dma_hw->ints0 & (1u << dma_channel)) {
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dma_hw->ints0 = (1u << dma_channel); // clear irq flag
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dma_channel_set_trans_count(dma_channel, BITSTREAM_LENGTH / 4, false);
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dma_channel_set_read_addr(dma_channel, bitstream, true);
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}
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}
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PicoUnicorn::~PicoUnicorn() {
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// stop and release the dma channel
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irq_set_enabled(DMA_IRQ_0, false);
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dma_channel_set_irq0_enabled(dma_channel, false);
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irq_set_enabled(pio_get_dreq(bitstream_pio, bitstream_sm, true), false);
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irq_remove_handler(DMA_IRQ_0, dma_complete);
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dma_channel_wait_for_finish_blocking(dma_channel);
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dma_channel_unclaim(dma_channel);
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// release the pio and sm
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pio_sm_unclaim(bitstream_pio, bitstream_sm);
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pio_clear_instruction_memory(bitstream_pio);
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pio_sm_restart(bitstream_pio, bitstream_sm);
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}
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void PicoUnicorn::init() {
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// todo: shouldn't need to do this if things were cleaned up properly but without
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// this any attempt to run a micropython script twice will fail
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static bool already_init = false;
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// setup pins
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gpio_init(pin::LED_DATA); gpio_set_dir(pin::LED_DATA, GPIO_OUT);
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gpio_init(pin::LED_CLOCK); gpio_set_dir(pin::LED_CLOCK, GPIO_OUT);
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gpio_init(pin::LED_LATCH); gpio_set_dir(pin::LED_LATCH, GPIO_OUT);
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gpio_init(pin::LED_BLANK); gpio_set_dir(pin::LED_BLANK, GPIO_OUT);
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gpio_init(pin::ROW_0); gpio_set_dir(pin::ROW_0, GPIO_OUT);
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gpio_init(pin::ROW_1); gpio_set_dir(pin::ROW_1, GPIO_OUT);
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gpio_init(pin::ROW_2); gpio_set_dir(pin::ROW_2, GPIO_OUT);
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gpio_init(pin::ROW_3); gpio_set_dir(pin::ROW_3, GPIO_OUT);
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gpio_init(pin::ROW_4); gpio_set_dir(pin::ROW_4, GPIO_OUT);
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gpio_init(pin::ROW_5); gpio_set_dir(pin::ROW_5, GPIO_OUT);
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gpio_init(pin::ROW_6); gpio_set_dir(pin::ROW_6, GPIO_OUT);
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// initialise the bcd timing values and row selects in the bitstream
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for(uint8_t row = 0; row < HEIGHT; row++) {
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for(uint8_t frame = 0; frame < BCD_FRAMES; frame++) {
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// determine offset in the buffer for this row/frame
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uint16_t offset = (row * ROW_BYTES * BCD_FRAMES) + (ROW_BYTES * frame);
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uint16_t row_select_offset = offset + 9;
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uint16_t bcd_offset = offset + 10;
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// the last bcd frame is used to allow the fets to discharge to avoid ghosting
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if(frame == BCD_FRAMES - 1) {
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bitstream[row_select_offset] = 0b11111111;
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uint16_t bcd_ticks = 65535;
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bitstream[bcd_offset + 1] = (bcd_ticks & 0xff00) >> 8;
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bitstream[bcd_offset] = (bcd_ticks & 0xff);
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for(uint8_t col = 0; col < 6; col++) {
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bitstream[offset + col] = 0xff;
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}
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}else{
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uint8_t row_select_mask = ~(1 << (7 - row));
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bitstream[row_select_offset] = row_select_mask;
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uint16_t bcd_ticks = 1 << frame;
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bitstream[bcd_offset + 1] = (bcd_ticks & 0xff00) >> 8;
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bitstream[bcd_offset] = (bcd_ticks & 0xff);
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}
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}
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}
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// setup button inputs
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gpio_set_function(pin::A, GPIO_FUNC_SIO); gpio_set_dir(pin::A, GPIO_IN); gpio_pull_up(pin::A);
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gpio_set_function(pin::B, GPIO_FUNC_SIO); gpio_set_dir(pin::B, GPIO_IN); gpio_pull_up(pin::B);
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gpio_set_function(pin::X, GPIO_FUNC_SIO); gpio_set_dir(pin::X, GPIO_IN); gpio_pull_up(pin::X);
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gpio_set_function(pin::Y, GPIO_FUNC_SIO); gpio_set_dir(pin::Y, GPIO_IN); gpio_pull_up(pin::Y);
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if(already_init) {
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// stop and release the dma channel
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irq_set_enabled(DMA_IRQ_0, false);
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dma_channel_abort(dma_channel);
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dma_channel_wait_for_finish_blocking(dma_channel);
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dma_channel_set_irq0_enabled(dma_channel, false);
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irq_set_enabled(pio_get_dreq(bitstream_pio, bitstream_sm, true), false);
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irq_remove_handler(DMA_IRQ_0, dma_complete);
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dma_channel_unclaim(dma_channel);
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// release the pio and sm
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pio_sm_unclaim(bitstream_pio, bitstream_sm);
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pio_clear_instruction_memory(bitstream_pio);
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pio_sm_restart(bitstream_pio, bitstream_sm);
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//return;
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}
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// setup the pio
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bitstream_pio = pio0;
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bitstream_sm = pio_claim_unused_sm(pio0, true);
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sm_offset = pio_add_program(bitstream_pio, &unicorn_program);
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unicorn_jetpack_program_init(bitstream_pio, bitstream_sm, sm_offset);
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// setup dma transfer for pixel data to the pio
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dma_channel = dma_claim_unused_channel(true);
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dma_channel_config config = dma_channel_get_default_config(dma_channel);
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channel_config_set_transfer_data_size(&config, DMA_SIZE_32);
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channel_config_set_bswap(&config, false); // byte swap to reverse little endian
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channel_config_set_dreq(&config, pio_get_dreq(bitstream_pio, bitstream_sm, true));
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dma_channel_configure(dma_channel, &config, &bitstream_pio->txf[bitstream_sm], NULL, 0, false);
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dma_channel_set_irq0_enabled(dma_channel, true);
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irq_set_enabled(pio_get_dreq(bitstream_pio, bitstream_sm, true), true);
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irq_set_exclusive_handler(DMA_IRQ_0, dma_complete);
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irq_set_enabled(DMA_IRQ_0, true);
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dma_channel_set_trans_count(dma_channel, BITSTREAM_LENGTH / 4, false);
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dma_channel_set_read_addr(dma_channel, bitstream, true);
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already_init = true;
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}
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void PicoUnicorn::clear() {
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for(uint8_t y = 0; y < HEIGHT; y++) {
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for(uint8_t x = 0; x < WIDTH; x++) {
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set_pixel(x, y, 0);
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}
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}
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}
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void PicoUnicorn::set_pixel(uint8_t x, uint8_t y, uint8_t r, uint8_t g, uint8_t b) {
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if(x < 0 || x >= WIDTH || y < 0 || y >= HEIGHT) return;
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// make those coordinates sane
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x = (WIDTH - 1) - x;
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// work out the byte offset of this pixel
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uint8_t byte_offset = x / 2;
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// check if it's the high or low nibble and create mask and shift value
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uint8_t shift = x % 2 == 0 ? 0 : 4;
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uint8_t nibble_mask = 0b00001111 << shift;
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uint16_t gr = pimoroni::GAMMA_14BIT[r];
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uint16_t gg = pimoroni::GAMMA_14BIT[g];
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uint16_t gb = pimoroni::GAMMA_14BIT[b];
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// set the appropriate bits in the separate bcd frames
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for(uint8_t frame = 0; frame < BCD_FRAMES; frame++) {
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// determine offset in the buffer for this row/frame
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uint16_t offset = (y * ROW_BYTES * BCD_FRAMES) + (ROW_BYTES * frame);
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uint8_t rgbd = ((gr & 0b1) << 1) | ((gg & 0b1) << 3) | ((gb & 0b1) << 2);
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// shift to correct nibble
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rgbd <<= shift;
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// clear existing data
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bitstream[offset + byte_offset] &= ~nibble_mask;
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// set new data
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bitstream[offset + byte_offset] |= rgbd;
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gr >>= 1;
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gg >>= 1;
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gb >>= 1;
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}
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}
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void PicoUnicorn::set_pixel(uint8_t x, uint8_t y, uint8_t v) {
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set_pixel(x, y, v, v, v);
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}
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bool PicoUnicorn::is_pressed(uint8_t button) {
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return !gpio_get(button);
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}
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}
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