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203 lines
7.3 KiB
203 lines
7.3 KiB
/*
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u8x8_display.c
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Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)
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Copyright (c) 2016, olikraus@gmail.com
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this list
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of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice, this
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list of conditions and the following disclaimer in the documentation and/or other
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materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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Abstraction layer for the graphics controller.
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Main goal is the placement of a 8x8 pixel block (tile) on the display.
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*/
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#include "u8x8.h"
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/*==========================================*/
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/* internal library function */
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/*
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this is a helper function for the U8X8_MSG_DISPLAY_SETUP_MEMORY function.
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It can be called within the display callback function to carry out the usual standard tasks.
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*/
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void u8x8_d_helper_display_setup_memory(u8x8_t *u8x8, const u8x8_display_info_t *display_info)
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{
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/* 1) set display info struct */
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u8x8->display_info = display_info;
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u8x8->x_offset = u8x8->display_info->default_x_offset;
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}
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/*
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this is a helper function for the U8X8_MSG_DISPLAY_INIT function.
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It can be called within the display callback function to carry out the usual standard tasks.
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*/
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void u8x8_d_helper_display_init(u8x8_t *u8x8)
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{
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/* 2) apply port directions to the GPIO lines and apply default values for the IO lines*/
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u8x8_gpio_Init(u8x8);
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u8x8_cad_Init(u8x8); /* this will also call U8X8_MSG_BYTE_INIT, byte init will NOT call GPIO_INIT */
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/* 3) do reset */
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u8x8_gpio_SetReset(u8x8, 1);
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u8x8_gpio_Delay(u8x8, U8X8_MSG_DELAY_MILLI, u8x8->display_info->reset_pulse_width_ms);
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u8x8_gpio_SetReset(u8x8, 0);
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u8x8_gpio_Delay(u8x8, U8X8_MSG_DELAY_MILLI, u8x8->display_info->reset_pulse_width_ms);
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u8x8_gpio_SetReset(u8x8, 1);
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u8x8_gpio_Delay(u8x8, U8X8_MSG_DELAY_MILLI, u8x8->display_info->post_reset_wait_ms);
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}
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/*==========================================*/
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/* official functions */
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uint8_t u8x8_DrawTile(u8x8_t *u8x8, uint8_t x, uint8_t y, uint8_t cnt, uint8_t *tile_ptr)
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{
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u8x8_tile_t tile;
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tile.x_pos = x;
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tile.y_pos = y;
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tile.cnt = cnt;
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tile.tile_ptr = tile_ptr;
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return u8x8->display_cb(u8x8, U8X8_MSG_DISPLAY_DRAW_TILE, 1, (void *)&tile);
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}
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/* should be implemented as macro */
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void u8x8_SetupMemory(u8x8_t *u8x8)
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{
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u8x8->display_cb(u8x8, U8X8_MSG_DISPLAY_SETUP_MEMORY, 0, NULL);
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}
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/*
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This will just init the display interface, compared to InitDisplay, it will not issue a reset and also not upload the init code.
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Comparison:
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Call u8x8_InitInterface u8x8_InitDisplay
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Init Interface yes yes
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Reset Display no yes
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Upload Display Init Code no yes
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u8x8_InitInterface() is an alternative function to u8x8_InitDisplay(). Do not call both.
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*/
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void u8x8_InitInterface(u8x8_t *u8x8)
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{
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u8x8_gpio_Init(u8x8);
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u8x8_cad_Init(u8x8); /* this will also call U8X8_MSG_BYTE_INIT, byte init will NOT call GPIO_INIT */
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}
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/*
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This will sent the display init message to the display.
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The display itself will then call u8x8_d_helper_display_init() from above. This includes:
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GPIO Init (set port directions)
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BYTE init (part of CAD init: which may set some levels)
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CAD init (which will set things like I2C default address)
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Issue a reset to the display: This will usually turn off the display
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Additonally each display will set the init code to the display, which will also turn of the display in most cases (Arduino code disable power save mode later)
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Actually this procedure should be better called InitInterfaceAndDisplay, because it actually does both.
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(actually u8x8_InitInterface() is not called directly but only u8x8_gpio_Init and u8x8_cad_Init which
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in turn is called by u8x8_InitInterface())
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InitDisplay is called by the Arduino begin() function
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In some cases it is not required to init the display (for example if the display is already running, but the controller comes out of deep sleep mode).
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Then InitDisplay can be skipped, but u8x8_InitInterface() (== u8x8_gpio_Init() and u8x8_cad_Init()) need to be executed.
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*/
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void u8x8_InitDisplay(u8x8_t *u8x8)
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{
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u8x8->display_cb(u8x8, U8X8_MSG_DISPLAY_INIT, 0, NULL); /* this will call u8x8_d_helper_display_init() and send the init seqence to the display */
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/* u8x8->display_cb(u8x8, U8X8_MSG_DISPLAY_SET_FLIP_MODE, 0, NULL); */ /* It would make sense to call flip mode 0 here after U8X8_MSG_DISPLAY_INIT */
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}
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void u8x8_SetPowerSave(u8x8_t *u8x8, uint8_t is_enable)
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{
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u8x8->display_cb(u8x8, U8X8_MSG_DISPLAY_SET_POWER_SAVE, is_enable, NULL);
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}
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void u8x8_SetFlipMode(u8x8_t *u8x8, uint8_t mode)
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{
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u8x8->display_cb(u8x8, U8X8_MSG_DISPLAY_SET_FLIP_MODE, mode, NULL);
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}
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void u8x8_SetContrast(u8x8_t *u8x8, uint8_t value)
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{
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u8x8->display_cb(u8x8, U8X8_MSG_DISPLAY_SET_CONTRAST, value, NULL);
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}
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void u8x8_RefreshDisplay(u8x8_t *u8x8)
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{
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u8x8->display_cb(u8x8, U8X8_MSG_DISPLAY_REFRESH, 0, NULL);
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}
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void u8x8_ClearDisplayWithTile(u8x8_t *u8x8, const uint8_t *buf)
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{
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u8x8_tile_t tile;
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uint8_t h;
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tile.x_pos = 0;
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tile.cnt = 1;
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tile.tile_ptr = (uint8_t *)buf; /* tile_ptr should be const, but isn't */
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h = u8x8->display_info->tile_height;
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tile.y_pos = 0;
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do
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{
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u8x8->display_cb(u8x8, U8X8_MSG_DISPLAY_DRAW_TILE, u8x8->display_info->tile_width, (void *)&tile);
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tile.y_pos++;
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} while( tile.y_pos < h );
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}
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void u8x8_ClearDisplay(u8x8_t *u8x8)
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{
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uint8_t buf[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
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u8x8_ClearDisplayWithTile(u8x8, buf);
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}
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void u8x8_FillDisplay(u8x8_t *u8x8)
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{
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uint8_t buf[8] = { 255, 255, 255, 255, 255, 255, 255, 255 };
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u8x8_ClearDisplayWithTile(u8x8, buf);
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}
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void u8x8_ClearLine(u8x8_t *u8x8, uint8_t line)
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{
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uint8_t buf[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
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u8x8_tile_t tile;
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if ( line < u8x8->display_info->tile_height )
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{
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tile.x_pos = 0;
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tile.y_pos = line;
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tile.cnt = 1;
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tile.tile_ptr = (uint8_t *)buf; /* tile_ptr should be const, but isn't */
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u8x8->display_cb(u8x8, U8X8_MSG_DISPLAY_DRAW_TILE, u8x8->display_info->tile_width, (void *)&tile);
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}
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} |