kopia lustrzana https://github.com/pimoroni/pimoroni-pico
HUB75 MicroPython DMA and PIO
Switch MicroPython HUB75 driver over to DMA/PIO. TODO: * Move this into drivers for C++ use too * Fix hitting "Stop" in Thonny causing rows to stick on the display (this is bad, and should not happen) * Fix "Stop -> Start" in Thonny causing weird display issues (it's not memory offets, maybe DMA/PIO issues?)pull/193/head
Phil Howard
rodzic
01f546aaf1
commit
0e8c1228af
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@ -28,9 +28,14 @@ typedef struct _Hub75_obj_t {
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_Hub75_obj_t *hub75_obj;
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void __isr dma_complete() {
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if(hub75_obj) hub75_obj->hub75->dma_complete();
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}
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/***** Print *****/
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void Hub75_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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(void)kind; //Unused input parameter
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(void)kind; // Unused input parameter
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_Hub75_obj_t *self = MP_OBJ_TO_PTR2(self_in, _Hub75_obj_t);
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mp_print_str(print, "Hub75(");
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@ -39,6 +44,11 @@ void Hub75_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind
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mp_print_str(print, " x ");
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mp_obj_print_helper(print, mp_obj_new_int(self->hub75->height), PRINT_REPR);
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mp_print_str(print, "addr = front: ");
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mp_obj_print_helper(print, mp_obj_new_int((uint32_t)&self->hub75->front_buffer[0]), PRINT_REPR);
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mp_print_str(print, " back: ");
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mp_obj_print_helper(print, mp_obj_new_int((uint32_t)&self->hub75->back_buffer[0]), PRINT_REPR);
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mp_print_str(print, ")");
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}
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@ -51,8 +61,6 @@ mp_obj_t Hub75___del__(mp_obj_t self_in) {
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/***** Constructor *****/
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mp_obj_t Hub75_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
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_Hub75_obj_t *self = nullptr;
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enum {
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ARG_width,
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ARG_height,
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@ -84,13 +92,12 @@ mp_obj_t Hub75_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, c
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buffer = m_new(Pixel, width * height * 2);
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}
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self = m_new_obj_with_finaliser(_Hub75_obj_t);
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self->base.type = &Hub75_type;
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self->buf = buffer;
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self->hub75 = new Hub75(width, height, buffer);
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hub75_obj = self;
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hub75_obj = m_new_obj_with_finaliser(_Hub75_obj_t);
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hub75_obj->base.type = &Hub75_type;
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hub75_obj->buf = buffer;
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hub75_obj->hub75 = new Hub75(width, height, buffer);
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return MP_OBJ_FROM_PTR(self);
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return MP_OBJ_FROM_PTR(hub75_obj);
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}
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mp_obj_t Hub75_clear(mp_obj_t self_in) {
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@ -107,15 +114,17 @@ mp_obj_t Hub75_flip(mp_obj_t self_in) {
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void Hub75_display_update() {
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if(hub75_obj) {
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hub75_obj->hub75->start();
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hub75_obj->hub75->start(nullptr);
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}
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}
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mp_obj_t Hub75_start(mp_obj_t self_in) {
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_Hub75_obj_t *self = MP_OBJ_TO_PTR2(self_in, _Hub75_obj_t);
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//size_t stack_size = 0;
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//mp_thread_create(&Hub75_display_update, nullptr, &stack_size);
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multicore_reset_core1();
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multicore_launch_core1(Hub75_display_update);
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//multicore_reset_core1();
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//multicore_launch_core1(Hub75_display_update);
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self->hub75->start(dma_complete);
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return mp_const_none;
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}
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@ -2,21 +2,11 @@
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#include <algorithm>
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#include "hub75.hpp"
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#include "pico/stdlib.h"
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#include "pico/multicore.h"
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Hub75::Hub75(uint8_t width, uint8_t height, Pixel *buffer)
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: width(width), height(height), front_buffer(buffer), back_buffer(buffer + width * height)
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{
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// 1.3v allows overclock to ~280000-300000 but YMMV. Faster clock = faster screen update rate!
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// vreg_set_voltage(VREG_VOLTAGE_1_30);
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// sleep_ms(100);
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// 200MHz is roughly about the lower limit for driving a 64x64 display smoothly.
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// Just don't look at it out of the corner of your eye.
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//set_sys_clock_khz(200000, true);
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// Set up allllll the GPIO
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gpio_init(pin_r0); gpio_set_function(pin_r0, GPIO_FUNC_SIO); gpio_set_dir(pin_r0, true);
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gpio_init(pin_g0); gpio_set_function(pin_g0, GPIO_FUNC_SIO); gpio_set_dir(pin_g0, true);
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@ -38,7 +28,15 @@ Hub75::Hub75(uint8_t width, uint8_t height, Pixel *buffer)
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}
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void Hub75::set_rgb(uint8_t x, uint8_t y, uint8_t r, uint8_t g, uint8_t b) {
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front_buffer[y * width + x] = Pixel(r, g, b);
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int offset = 0;
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if(y >= height / 2) {
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y -= height / 2;
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offset = (y * width + x) * 2;
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offset += 1;
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} else {
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offset = (y * width + x) * 2;
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}
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front_buffer[offset] = Pixel(r, g, b);
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}
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void Hub75::FM6126A_write_register(uint16_t value, uint8_t position) {
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@ -46,6 +44,7 @@ void Hub75::FM6126A_write_register(uint16_t value, uint8_t position) {
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for(auto i = 0u; i < width; i++) {
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auto j = i % 16;
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bool b = value & (1 << j);
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gpio_put(pin_r0, b);
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gpio_put(pin_g0, b);
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gpio_put(pin_b0, b);
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@ -62,24 +61,81 @@ void Hub75::FM6126A_write_register(uint16_t value, uint8_t position) {
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}
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}
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void Hub75::start() {
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void Hub75::start(irq_handler_t handler) {
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running = true;
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// Ridiculous register write nonsense for the FM6126A-based 64x64 matrix
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FM6126A_write_register(0b1111111111111110, 12);
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FM6126A_write_register(0b0000001000000000, 13);
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while (running) {
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display_update();
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if(handler) {
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pio_sm_claim(pio, sm_data);
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pio_sm_claim(pio, sm_row);
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data_prog_offs = pio_add_program(pio, &hub75_data_rgb888_program);
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row_prog_offs = pio_add_program(pio, &hub75_row_program);
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hub75_data_rgb888_program_init(pio, sm_data, data_prog_offs, DATA_BASE_PIN, CLK_PIN);
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hub75_row_program_init(pio, sm_row, row_prog_offs, ROWSEL_BASE_PIN, ROWSEL_N_PINS, STROBE_PIN);
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dma_channel = 0;
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dma_channel_claim(dma_channel);
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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);
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channel_config_set_dreq(&config, pio_get_dreq(pio, sm_data, true));
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dma_channel_configure(dma_channel, &config, &pio->txf[sm_data], 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(pio, sm_data, true), true);
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irq_set_exclusive_handler(DMA_IRQ_0, handler);
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irq_set_enabled(DMA_IRQ_0, true);
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row = 0;
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bit = 0;
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dma_channel_set_trans_count(dma_channel, width * 4, false);
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dma_channel_set_read_addr(dma_channel, &back_buffer, true);
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} else {
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while (running) {
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display_update();
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}
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}
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}
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void Hub75::stop() {
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running = false;
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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(pio, sm_data, 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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hub75_wait_tx_stall(pio, sm_row);
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// release the pio and sm
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pio_sm_unclaim(pio, sm_data);
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pio_sm_unclaim(pio, sm_row);
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pio_clear_instruction_memory(pio);
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pio_sm_restart(pio, sm_data);
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pio_sm_restart(pio, sm_row);
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gpio_put(pin_stb, !STB_POLARITY);
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gpio_put(pin_oe, !OE_POLARITY);
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}
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Hub75::~Hub75() {
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stop();
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}
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void Hub75::clear() {
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for(auto x = 0u; x < width; x++) {
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for(auto y = 0u; y < height; y++) {
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set_rgb(x, y, 0, 0, 0);
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}
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}
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}
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void Hub75::flip() {
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@ -88,16 +144,17 @@ void Hub75::flip() {
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void Hub75::display_update() {
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if (do_flip) {
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//std::swap(front_buffer, back_buffer);
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memcpy((uint8_t *)back_buffer, (uint8_t *)front_buffer, width * height * sizeof(Pixel));
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memcpy(back_buffer, front_buffer, width * height * sizeof(Pixel));
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do_flip = false;
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}
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for(auto bit = 1u; bit < 1 << 11; bit <<= 1) {
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for(auto y = 0u; y < height / 2; y++) {
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auto row_top = y * width;
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auto row_bottom = (y + height / 2) * width;
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for(auto x = 0u; x < width; x++) {
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Pixel pixel_top = back_buffer[y * width + x];
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Pixel pixel_bottom = back_buffer[(y + height / 2) * width + x];
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Pixel pixel_top = back_buffer[row_top + x];
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Pixel pixel_bottom = back_buffer[row_bottom + x];
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gpio_put(pin_clk, !clk_polarity);
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@ -123,6 +180,40 @@ void Hub75::display_update() {
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gpio_put(pin_stb, !stb_polarity);
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gpio_put(pin_oe, !oe_polarity);
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}
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sleep_us(1);
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}
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}
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void Hub75::dma_complete() {
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if (do_flip && bit == 0 && row == 0) {
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memcpy(back_buffer, front_buffer, width * height * sizeof(Pixel));
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do_flip = false;
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}
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if(dma_channel_get_irq0_status(dma_channel)) {
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dma_channel_acknowledge_irq0(dma_channel);
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// SM is finished when it stalls on empty TX FIFO (or, y'know, DMA callback)
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//hub75_wait_tx_stall(pio, sm_data);
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// Check that previous OEn pulse is finished, else things WILL get out of sequence
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hub75_wait_tx_stall(pio, sm_row);
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// Latch row data, pulse output enable for new row.
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pio_sm_put_blocking(pio, sm_row, row | (3u * (1u << bit) << 5));
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row++;
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if(row == height / 2) {
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row = 0;
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bit++;
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if (bit == 12) {
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bit = 0;
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}
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hub75_data_rgb888_set_shift(pio, sm_data, data_prog_offs, bit);
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}
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}
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dma_channel_set_trans_count(dma_channel, width * 4, false);
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//dma_channel_set_read_addr(dma_channel, dma_buffer, true);
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dma_channel_set_read_addr(dma_channel, &back_buffer[row * width * 2], true);
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}
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@ -1,4 +1,23 @@
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#include <stdint.h>
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#include "pico/stdlib.h"
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#include "pico/multicore.h"
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#include "hardware/pio.h"
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#include "hardware/dma.h"
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#include "hardware/irq.h"
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#include "hub75.pio.h"
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const uint DATA_BASE_PIN = 0;
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const uint DATA_N_PINS = 6;
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const uint ROWSEL_BASE_PIN = 6;
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const uint ROWSEL_N_PINS = 5;
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const uint CLK_PIN = 11;
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const uint STROBE_PIN = 12;
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const uint OEN_PIN = 13;
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const bool CLK_POLARITY = 1;
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const bool STB_POLARITY = 1;
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const bool OE_POLARITY = 0;
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// This gamma table is used to correct our 8-bit (0-255) colours up to 11-bit,
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// allowing us to gamma correct without losing dynamic range.
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@ -24,12 +43,12 @@ constexpr uint16_t GAMMA_12BIT[256] = {
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// We don't *need* to make Pixel a fancy struct with RGB values, but it helps.
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#pragma pack(push, 1)
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struct alignas(4) Pixel {
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uint16_t _;
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uint16_t r;
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uint16_t g;
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uint16_t b;
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uint16_t _;
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constexpr Pixel() : r(0), g(0), b(0), _(0) {};
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constexpr Pixel(uint8_t r, uint8_t g, uint8_t b) : r(GAMMA_12BIT[r]), g(GAMMA_12BIT[g]), b(GAMMA_12BIT[b]), _(0) {};
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constexpr Pixel() : _(0), r(0), g(0), b(0) {};
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constexpr Pixel(uint8_t r, uint8_t g, uint8_t b) : _(0), r(GAMMA_12BIT[r]), g(GAMMA_12BIT[g]), b(GAMMA_12BIT[b]) {};
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};
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#pragma pack(pop)
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@ -41,6 +60,20 @@ class Hub75 {
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Pixel *back_buffer;
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bool running = false;
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// DMA & PIO
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uint dma_channel = 0;
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volatile bool do_flip = false;
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uint bit = 0;
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uint row = 0;
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PIO pio = pio0;
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uint sm_data = 0;
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uint sm_row = 1;
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uint data_prog_offs = 0;
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uint row_prog_offs = 0;
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// Top half of display - 16 rows on a 32x32 panel
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unsigned int pin_r0 = 0;
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unsigned int pin_g0 = 1;
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@ -75,17 +108,15 @@ class Hub75 {
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unsigned int pin_led_g = 17;
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unsigned int pin_led_b = 18;
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volatile bool do_flip = false;
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Hub75(uint8_t width, uint8_t height, Pixel *buffer);
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~Hub75() {
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};
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~Hub75();
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void FM6126A_write_register(uint16_t value, uint8_t position);
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void set_rgb(uint8_t x, uint8_t y, uint8_t r, uint8_t g, uint8_t b);
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void display_update();
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void clear();
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void start();
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void start(irq_handler_t handler);
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void stop();
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void flip();
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void dma_complete();
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};
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@ -0,0 +1,141 @@
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;
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; Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
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;
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; SPDX-License-Identifier: BSD-3-Clause
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;
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.program hub75_row
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; side-set pin 0 is LATCH
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; side-set pin 1 is OEn
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; OUT pins are row select A-E
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;
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; Each FIFO record consists of:
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; - 5-bit row select (LSBs)
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; - Pulse width - 1 (27 MSBs)
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;
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; Repeatedly select a row, pulse LATCH, and generate a pulse of a certain
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; width on OEn.
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.side_set 2
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.wrap_target
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out pins, 5 [7] side 0x2 ; Deassert OEn, output row select
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out x, 27 [7] side 0x3 ; Pulse LATCH, get OEn pulse width
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pulse_loop:
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jmp x-- pulse_loop side 0x0 ; Assert OEn for x+1 cycles
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.wrap
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% c-sdk {
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static inline void hub75_row_program_init(PIO pio, uint sm, uint offset, uint row_base_pin, uint n_row_pins, uint latch_base_pin) {
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pio_sm_set_consecutive_pindirs(pio, sm, row_base_pin, n_row_pins, true);
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pio_sm_set_consecutive_pindirs(pio, sm, latch_base_pin, 2, true);
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for (uint i = row_base_pin; i < row_base_pin + n_row_pins; ++i)
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pio_gpio_init(pio, i);
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pio_gpio_init(pio, latch_base_pin);
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pio_gpio_init(pio, latch_base_pin + 1);
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pio_sm_config c = hub75_row_program_get_default_config(offset);
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sm_config_set_out_pins(&c, row_base_pin, n_row_pins);
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sm_config_set_sideset_pins(&c, latch_base_pin);
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sm_config_set_out_shift(&c, true, true, 32);
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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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static inline void hub75_wait_tx_stall(PIO pio, uint sm) {
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uint32_t txstall_mask = 1u << (PIO_FDEBUG_TXSTALL_LSB + sm);
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pio->fdebug = txstall_mask;
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while (!(pio->fdebug & txstall_mask))
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tight_loop_contents();
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}
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||||
%}
|
||||
|
||||
.program hub75_data_rgb888
|
||||
.side_set 1
|
||||
|
||||
; Each FIFO record consists of a RGB888 pixel. (This is ok for e.g. an RGB565
|
||||
; source which has been gamma-corrected)
|
||||
;
|
||||
; Even pixels are sent on R0, G0, B0 and odd pixels on R1, G1, B1 (typically
|
||||
; these are for different parts of the screen, NOT for adjacent pixels, so the
|
||||
; frame buffer must be interleaved before passing to PIO.)
|
||||
;
|
||||
; Each pass through, we take bit n, n + 8 and n + 16 from each pixel, for n in
|
||||
; {0...7}. Therefore the pixels need to be transmitted 8 times (ouch) to build
|
||||
; up the full 8 bit value for each channel, and perform bit-planed PWM by
|
||||
; varying pulse widths on the other state machine, in ascending powers of 2.
|
||||
; This avoids a lot of bit shuffling on the processors, at the cost of DMA
|
||||
; bandwidth (which we have loads of).
|
||||
|
||||
; Might want to close your eyes before you read this
|
||||
public entry_point:
|
||||
.wrap_target
|
||||
|
||||
public shift0: ; R0 G0 B0 (Top half of 64x64 displays)
|
||||
pull side 0 ; gets patched to `out null, n` if n nonzero (otherwise the PULL is required for fencing)
|
||||
out null, 16 side 0 ; discard _
|
||||
in osr, 1 side 0 ; Red0
|
||||
out null, 32 side 0 ; discard remaining bits
|
||||
|
||||
public shift1:
|
||||
pull side 0 ; gets patched to out null, n if n is nonzero (otherwise PULL required)
|
||||
in osr, 1 side 0 ; Green0
|
||||
out null, 16 side 0 ; << next uint16
|
||||
in osr, 1 side 0 ; Blue0
|
||||
out null, 32 side 0 ; discard remaining bits
|
||||
|
||||
public shift2:
|
||||
pull side 0 ; gets patched to out null, n if n is nonzero (otherwise PULL required)
|
||||
out null, 16 side 0 ; discard _
|
||||
in osr, 1 side 0 ; Red1
|
||||
out null, 32 side 0 ; discard remaining bits
|
||||
|
||||
public shift3: ; R1 G1 B1 (Bottom half of 64x64 displays)
|
||||
pull side 0 ; gets patched to out null, n if n is nonzero (otherwise PULL required)
|
||||
in osr, 1 side 0 ; Green0, CLK rising edge
|
||||
out null, 16 side 0 ; << next uint16
|
||||
in osr, 1 side 0 ; Blue0
|
||||
out null, 32 side 0 ; discard remaining bits
|
||||
|
||||
in null, 26 side 0 ; Note we are just doing this little manoeuvre here to get GPIOs in the order
|
||||
mov pins, ::isr [7] side 1 ; R0, G0, B0, R1, G1, B1. Can go 1 cycle faster if reversed
|
||||
.wrap
|
||||
; Note that because the clock edge for pixel n is in the middle of pixel n +
|
||||
; 1, a dummy pixel at the end is required to clock the last piece of genuine
|
||||
; data. (Also 1 pixel of garbage is clocked out at the start, but this is
|
||||
; harmless)
|
||||
|
||||
% c-sdk {
|
||||
static inline void hub75_data_rgb888_program_init(PIO pio, uint sm, uint offset, uint rgb_base_pin, uint clock_pin) {
|
||||
pio_sm_set_consecutive_pindirs(pio, sm, rgb_base_pin, 6, true);
|
||||
pio_sm_set_consecutive_pindirs(pio, sm, clock_pin, 1, true);
|
||||
for (uint i = rgb_base_pin; i < rgb_base_pin + 6; ++i)
|
||||
pio_gpio_init(pio, i);
|
||||
pio_gpio_init(pio, clock_pin);
|
||||
|
||||
pio_sm_config c = hub75_data_rgb888_program_get_default_config(offset);
|
||||
sm_config_set_out_pins(&c, rgb_base_pin, 6);
|
||||
sm_config_set_sideset_pins(&c, clock_pin);
|
||||
sm_config_set_out_shift(&c, true, true, 32);
|
||||
// ISR shift to left. R0 ends up at bit 5. We push it up to MSB and then flip the register.
|
||||
sm_config_set_in_shift(&c, false, false, 32);
|
||||
sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
|
||||
pio_sm_init(pio, sm, offset, &c);
|
||||
pio_sm_exec(pio, sm, offset + hub75_data_rgb888_offset_entry_point);
|
||||
pio_sm_set_enabled(pio, sm, true);
|
||||
}
|
||||
|
||||
// Patch a data program at `offset` to preshift pixels by `shamt`
|
||||
static inline void hub75_data_rgb888_set_shift(PIO pio, uint sm, uint offset, uint shamt) {
|
||||
uint16_t instr;
|
||||
if (shamt == 0)
|
||||
instr = pio_encode_pull(false, true); // blocking PULL
|
||||
else
|
||||
instr = pio_encode_out(pio_null, shamt);
|
||||
pio->instr_mem[offset + hub75_data_rgb888_offset_shift0] = instr;
|
||||
pio->instr_mem[offset + hub75_data_rgb888_offset_shift1] = instr;
|
||||
pio->instr_mem[offset + hub75_data_rgb888_offset_shift2] = instr;
|
||||
pio->instr_mem[offset + hub75_data_rgb888_offset_shift3] = instr;
|
||||
}
|
||||
%}
|
||||
|
|
@ -21,3 +21,5 @@ set_source_files_properties(
|
|||
PROPERTIES COMPILE_FLAGS
|
||||
"-Wno-discarded-qualifiers -Wno-implicit-int"
|
||||
)
|
||||
|
||||
pico_generate_pio_header(usermod_hub75 ${CMAKE_CURRENT_LIST_DIR}/lib/hub75.pio)
|
||||
Ładowanie…
Reference in New Issue