253 lines
8.5 KiB
C
253 lines
8.5 KiB
C
// This file is part of the CircuitPython project: https://circuitpython.org
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//
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// SPDX-FileCopyrightText: Copyright (c) 2020 Jeff Epler for Adafruit Industries
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//
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// SPDX-License-Identifier: MIT
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#include <string.h>
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#include "py/gc.h"
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#include "shared-bindings/board/__init__.h"
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#include "shared-bindings/microcontroller/Pin.h"
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#include "shared-bindings/sharpdisplay/SharpMemoryFramebuffer.h"
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#include "shared-module/sharpdisplay/SharpMemoryFramebuffer.h"
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#include "supervisor/port.h"
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#define SHARPMEM_BIT_WRITECMD_LSB (0x80)
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#define JDI_BIT_WRITECMD_LSB (0x90)
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#define SHARPMEM_BIT_VCOM_LSB (0x40)
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static uint8_t bitrev(uint8_t n) {
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uint8_t r = 0;
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for (int i = 0; i < 8; i++) {r |= ((n >> i) & 1) << (7 - i);
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}
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return r;
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}
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int common_hal_sharpdisplay_framebuffer_get_width(sharpdisplay_framebuffer_obj_t *self) {
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return self->width;
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}
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int common_hal_sharpdisplay_framebuffer_get_height(sharpdisplay_framebuffer_obj_t *self) {
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return self->height;
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}
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static int common_hal_sharpdisplay_framebuffer_get_row_stride(sharpdisplay_framebuffer_obj_t *self) {
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if (self->jdi_display) {
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return (self->width + 1) / 2 + 2;
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} else {
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return (self->width + 7) / 8 + 2;
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}
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}
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static int common_hal_sharpdisplay_framebuffer_get_first_pixel_offset(sharpdisplay_framebuffer_obj_t *self) {
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return 2;
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}
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static bool common_hal_sharpdisplay_framebuffer_get_reverse_pixels_in_byte(sharpdisplay_framebuffer_obj_t *self) {
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return true;
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}
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static bool common_hal_sharpdisplay_framebuffer_get_pixels_in_byte_share_row(sharpdisplay_framebuffer_obj_t *self) {
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return true;
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}
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void common_hal_sharpdisplay_framebuffer_reset(sharpdisplay_framebuffer_obj_t *self) {
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if (self->bus != &self->inline_bus
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#if CIRCUITPY_BOARD_SPI
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&& !common_hal_board_is_spi(self->bus)
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#endif
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) {
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memcpy(&self->inline_bus, self->bus, sizeof(busio_spi_obj_t));
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self->bus = &self->inline_bus;
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}
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}
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void common_hal_sharpdisplay_framebuffer_reconstruct(sharpdisplay_framebuffer_obj_t *self) {
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}
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void common_hal_sharpdisplay_framebuffer_get_bufinfo(sharpdisplay_framebuffer_obj_t *self, mp_buffer_info_t *bufinfo) {
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if (!self->bufinfo.buf) {
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int row_stride = common_hal_sharpdisplay_framebuffer_get_row_stride(self);
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int height = common_hal_sharpdisplay_framebuffer_get_height(self);
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self->bufinfo.len = row_stride * height + 2;
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self->bufinfo.buf = port_malloc(self->bufinfo.len, false);
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if (self->bufinfo.buf == NULL) {
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m_malloc_fail(self->bufinfo.len);
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}
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memset(self->bufinfo.buf, 0, self->bufinfo.len);
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uint8_t *data = self->bufinfo.buf;
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if (self->jdi_display) {
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*data++ = JDI_BIT_WRITECMD_LSB;
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} else {
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*data++ = SHARPMEM_BIT_WRITECMD_LSB;
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}
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for (int y = 0; y < height; y++) {
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if (self->jdi_display) {
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*data = y + 1;
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} else {
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*data = bitrev(y + 1);
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}
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data += row_stride;
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}
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self->full_refresh = true;
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}
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if (bufinfo) {
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*bufinfo = self->bufinfo;
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}
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}
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void common_hal_sharpdisplay_framebuffer_deinit(sharpdisplay_framebuffer_obj_t *self) {
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if (self->base.type != &sharpdisplay_framebuffer_type) {
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return;
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}
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if (self->bus == &self->inline_bus) {
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common_hal_busio_spi_deinit(self->bus);
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}
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common_hal_reset_pin(self->chip_select.pin);
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port_free(self->bufinfo.buf);
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memset(self, 0, sizeof(*self));
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}
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void common_hal_sharpdisplay_framebuffer_construct(
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sharpdisplay_framebuffer_obj_t *self,
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busio_spi_obj_t *spi,
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const mcu_pin_obj_t *chip_select,
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int baudrate,
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int width,
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int height,
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bool jdi_display) {
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common_hal_digitalio_digitalinout_construct(&self->chip_select, chip_select);
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common_hal_digitalio_digitalinout_switch_to_output(&self->chip_select, true, DRIVE_MODE_PUSH_PULL);
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common_hal_never_reset_pin(chip_select);
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self->bus = spi;
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common_hal_busio_spi_never_reset(self->bus);
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self->width = width;
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self->height = height;
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self->baudrate = baudrate;
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self->jdi_display = jdi_display;
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common_hal_sharpdisplay_framebuffer_get_bufinfo(self, NULL);
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}
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static void common_hal_sharpdisplay_framebuffer_swapbuffers(sharpdisplay_framebuffer_obj_t *self, uint8_t *dirty_row_bitmask) {
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// claim SPI bus
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if (!common_hal_busio_spi_try_lock(self->bus)) {
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return;
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}
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common_hal_busio_spi_configure(self->bus, self->baudrate, 0, 0, 8);
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// set chip select high
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common_hal_digitalio_digitalinout_set_value(&self->chip_select, true);
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// output the toggling signal
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uint8_t *data = self->bufinfo.buf;
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data[0] ^= SHARPMEM_BIT_VCOM_LSB;
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common_hal_busio_spi_write(self->bus, data++, 1);
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// output each changed row
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size_t row_stride = common_hal_sharpdisplay_framebuffer_get_row_stride(self);
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for (int y = 0; y < self->height; y++) {
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if (self->full_refresh || (dirty_row_bitmask[y / 8] & (1 << (y & 7)))) {
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common_hal_busio_spi_write(self->bus, data, row_stride);
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}
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data += row_stride;
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}
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// output a trailing zero
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uint8_t zero[2] = {0, 0};
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common_hal_busio_spi_write(self->bus, zero, self->jdi_display ? 2 : 1);
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// set chip select low
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common_hal_digitalio_digitalinout_set_value(&self->chip_select, false);
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// release SPI bus
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common_hal_busio_spi_unlock(self->bus);
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self->full_refresh = false;
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}
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static void sharpdisplay_framebuffer_deinit(mp_obj_t self_in) {
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sharpdisplay_framebuffer_obj_t *self = self_in;
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common_hal_sharpdisplay_framebuffer_deinit(self);
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}
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static void sharpdisplay_framebuffer_get_bufinfo(mp_obj_t self_in, mp_buffer_info_t *bufinfo) {
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sharpdisplay_framebuffer_obj_t *self = self_in;
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common_hal_sharpdisplay_framebuffer_get_bufinfo(self, bufinfo);
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}
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static int sharpdisplay_framebuffer_get_color_depth(mp_obj_t self_in) {
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sharpdisplay_framebuffer_obj_t *self = MP_OBJ_TO_PTR(self_in);
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return self->jdi_display ? 4 : 1;
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}
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static bool sharpdisplay_framebuffer_get_grayscale(mp_obj_t self_in) {
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sharpdisplay_framebuffer_obj_t *self = MP_OBJ_TO_PTR(self_in);
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return !self->jdi_display;
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}
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static int sharpdisplay_framebuffer_get_height(mp_obj_t self_in) {
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sharpdisplay_framebuffer_obj_t *self = self_in;
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return common_hal_sharpdisplay_framebuffer_get_height(self);
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}
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static int sharpdisplay_framebuffer_get_width(mp_obj_t self_in) {
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sharpdisplay_framebuffer_obj_t *self = self_in;
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return common_hal_sharpdisplay_framebuffer_get_width(self);
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}
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static int sharpdisplay_framebuffer_get_first_pixel_offset(mp_obj_t self_in) {
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sharpdisplay_framebuffer_obj_t *self = self_in;
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return common_hal_sharpdisplay_framebuffer_get_first_pixel_offset(self);
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}
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static bool sharpdisplay_framebuffer_get_pixels_in_byte_share_row(mp_obj_t self_in) {
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sharpdisplay_framebuffer_obj_t *self = self_in;
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return common_hal_sharpdisplay_framebuffer_get_pixels_in_byte_share_row(self);
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}
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static bool sharpdisplay_framebuffer_get_reverse_pixels_in_byte(mp_obj_t self_in) {
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sharpdisplay_framebuffer_obj_t *self = self_in;
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return common_hal_sharpdisplay_framebuffer_get_reverse_pixels_in_byte(self);
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}
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static int sharpdisplay_framebuffer_get_row_stride(mp_obj_t self_in) {
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sharpdisplay_framebuffer_obj_t *self = self_in;
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return common_hal_sharpdisplay_framebuffer_get_row_stride(self);
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}
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static void sharpdisplay_framebuffer_swapbuffers(mp_obj_t self_in, uint8_t *dirty_row_bitmask) {
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sharpdisplay_framebuffer_obj_t *self = self_in;
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common_hal_sharpdisplay_framebuffer_swapbuffers(self, dirty_row_bitmask);
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}
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const framebuffer_p_t sharpdisplay_framebuffer_proto = {
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MP_PROTO_IMPLEMENT(MP_QSTR_protocol_framebuffer)
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.deinit = sharpdisplay_framebuffer_deinit,
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.get_bufinfo = sharpdisplay_framebuffer_get_bufinfo,
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.get_color_depth = sharpdisplay_framebuffer_get_color_depth,
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.get_grayscale = sharpdisplay_framebuffer_get_grayscale,
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.get_height = sharpdisplay_framebuffer_get_height,
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.get_width = sharpdisplay_framebuffer_get_width,
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.swapbuffers = sharpdisplay_framebuffer_swapbuffers,
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.get_first_pixel_offset = sharpdisplay_framebuffer_get_first_pixel_offset,
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.get_pixels_in_byte_share_row = sharpdisplay_framebuffer_get_pixels_in_byte_share_row,
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.get_reverse_pixels_in_byte = sharpdisplay_framebuffer_get_reverse_pixels_in_byte,
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.get_row_stride = sharpdisplay_framebuffer_get_row_stride,
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};
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void common_hal_sharpdisplay_framebuffer_collect_ptrs(sharpdisplay_framebuffer_obj_t *self) {
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gc_collect_ptr(self->bus);
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}
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