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#include <string.h>
#include "shared-module/displayio/__init__.h"
#include "lib/utils/interrupt_char.h"
#include "py/reload.h"
#include "py/runtime.h"
#include "shared-bindings/displayio/Bitmap.h"
#include "shared-bindings/displayio/Display.h"
#include "shared-bindings/displayio/Group.h"
#include "shared-bindings/displayio/Palette.h"
#include "supervisor/shared/autoreload.h"
#include "supervisor/shared/display.h"
#include "supervisor/memory.h"
#include "supervisor/usb.h"
primary_display_t displays[CIRCUITPY_DISPLAY_LIMIT];
static inline void swap(uint16_t* a, uint16_t* b) {
uint16_t temp = *a;
*a = *b;
*b = temp;
}
bool refreshing_displays = false;
void displayio_refresh_displays(void) {
if (mp_hal_is_interrupted()) {
return;
}
// Somehow reloads from the sdcard are being lost. So, cheat and reraise.
// But don't re-raise if already pending.
if (reload_requested && MP_STATE_VM(mp_pending_exception) == MP_OBJ_NULL) {
mp_raise_reload_exception();
return;
}
if (refreshing_displays) {
return;
}
refreshing_displays = true;
for (uint8_t i = 0; i < CIRCUITPY_DISPLAY_LIMIT; i++) {
if (displays[i].display.base.type == NULL || displays[i].display.base.type == &mp_type_NoneType) {
continue;
}
displayio_display_obj_t* display = &displays[i].display;
displayio_display_update_backlight(display);
if (!displayio_display_frame_queued(display)) {
refreshing_displays = false;
return;
}
if (displayio_display_refresh_queued(display)) {
// We compute the pixels. r and c are row and column to match the display memory
// structure. x and y match location within the groups.
uint16_t c0 = 0;
uint16_t r0 = 0;
uint16_t c1 = display->width;
uint16_t r1 = display->height;
if (display->transpose_xy) {
swap(&c1, &r1);
}
// Someone else is holding the bus used to talk to the display,
// so skip update for now.
if (!displayio_display_start_region_update(display, c0, r0, c1, r1)) {
return;
}
uint16_t x0 = 0;
uint16_t x1 = display->width - 1;
uint16_t startx = 0;
int8_t dx = 1;
if (display->mirror_x) {
dx = -1;
startx = x1;
}
uint16_t y0 = 0;
uint16_t y1 = display->height - 1;
uint16_t starty = 0;
int8_t dy = 1;
if (display->mirror_y) {
dy = -1;
starty = y1;
}
bool transpose = false;
if (display->transpose_xy) {
transpose = true;
int8_t temp_dx = dx;
dx = dy;
dy = temp_dx;
swap(&starty, &startx);
swap(&x0, &y0);
swap(&x1, &y1);
}
size_t index = 0;
uint16_t buffer_size = 256;
uint32_t buffer[buffer_size / 2];
for (uint16_t y = starty; y0 <= y && y <= y1; y += dy) {
for (uint16_t x = startx; x0 <= x && x <= x1; x += dx) {
uint16_t* pixel = &(((uint16_t*)buffer)[index]);
*pixel = 0;
if (display->current_group != NULL) {
if (transpose) {
displayio_group_get_pixel(display->current_group, y, x, pixel);
} else {
displayio_group_get_pixel(display->current_group, x, y, pixel);
}
}
index += 1;
// The buffer is full, send it.
if (index >= buffer_size) {
if (!displayio_display_send_pixels(display, buffer, buffer_size / 2) || reload_requested) {
displayio_display_finish_region_update(display);
refreshing_displays = false;
return;
}
// TODO(tannewt): Make refresh displays faster so we don't starve other
// background tasks.
usb_background();
index = 0;
}
}
}
// Send the remaining data.
if (index && !displayio_display_send_pixels(display, buffer, index * 2)) {
displayio_display_finish_region_update(display);
refreshing_displays = false;
return;
}
displayio_display_finish_region_update(display);
}
displayio_display_finish_refresh(display);
}
refreshing_displays = false;
}
void common_hal_displayio_release_displays(void) {
for (uint8_t i = 0; i < CIRCUITPY_DISPLAY_LIMIT; i++) {
mp_const_obj_t bus_type = displays[i].fourwire_bus.base.type;
if (bus_type == NULL) {
continue;
} else if (bus_type == &displayio_fourwire_type) {
common_hal_displayio_fourwire_deinit(&displays[i].fourwire_bus);
} else if (bus_type == &displayio_parallelbus_type) {
common_hal_displayio_parallelbus_deinit(&displays[i].parallel_bus);
}
displays[i].fourwire_bus.base.type = &mp_type_NoneType;
}
for (uint8_t i = 0; i < CIRCUITPY_DISPLAY_LIMIT; i++) {
release_display(&displays[i].display);
displays[i].display.base.type = &mp_type_NoneType;
}
supervisor_stop_terminal();
}
void reset_displays(void) {
#if CIRCUITPY_DISPLAYIO
// The SPI buses used by FourWires may be allocated on the heap so we need to move them inline.
for (uint8_t i = 0; i < CIRCUITPY_DISPLAY_LIMIT; i++) {
if (displays[i].fourwire_bus.base.type != &displayio_fourwire_type) {
continue;
}
displayio_fourwire_obj_t* fourwire = &displays[i].fourwire_bus;
if (((uint32_t) fourwire->bus) < ((uint32_t) &displays) ||
((uint32_t) fourwire->bus) > ((uint32_t) &displays + CIRCUITPY_DISPLAY_LIMIT)) {
busio_spi_obj_t* original_spi = fourwire->bus;
if (original_spi == board_spi()) {
continue;
}
memcpy(&fourwire->inline_bus, original_spi, sizeof(busio_spi_obj_t));
fourwire->bus = &fourwire->inline_bus;
// Check for other displays that use the same spi bus and swap them too.
for (uint8_t j = i + 1; j < CIRCUITPY_DISPLAY_LIMIT; j++) {
if (displays[i].fourwire_bus.bus == original_spi) {
displays[i].fourwire_bus.bus = &fourwire->inline_bus;
}
}
}
}
for (uint8_t i = 0; i < CIRCUITPY_DISPLAY_LIMIT; i++) {
if (displays[i].display.base.type == NULL) {
continue;
}
displayio_display_obj_t* display = &displays[i].display;
display->auto_brightness = true;
common_hal_displayio_display_show(display, &circuitpython_splash);
}
#endif
}
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