95 lines
3.3 KiB
C
95 lines
3.3 KiB
C
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/*
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u8g_com_api_16gr.c
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Extension of the com api for devices with 16 graylevels (4 bit per pixel).
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This should fit to the 8h and 16h architectures (pb8v1, pb8v2, pb16v1, pb16v2),
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mainly intended for SSD OLEDs
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Universal 8bit Graphics Library
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Copyright (c) 2011, 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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*/
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#include "u8g.h"
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/* interpret b as a monochrome bit pattern, write value 15 for high bit and value 0 for a low bit */
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/* topbit (msb) is sent last */
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/* example: b = 0x083 will send 0xff, 0x00, 0x00, 0xf0 */
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uint8_t u8g_WriteByteBWTo16GrDevice(u8g_t *u8g, u8g_dev_t *dev, uint8_t b)
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{
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static uint8_t buf[4];
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static uint8_t map[4] = { 0, 0x00f, 0x0f0, 0x0ff };
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buf [3] = map[b & 3];
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b>>=2;
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buf [2] = map[b & 3];
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b>>=2;
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buf [1] = map[b & 3];
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b>>=2;
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buf [0] = map[b & 3];
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return dev->com_fn(u8g, U8G_COM_MSG_WRITE_SEQ, 4, buf);
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}
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uint8_t u8g_WriteSequenceBWTo16GrDevice(u8g_t *u8g, u8g_dev_t *dev, uint8_t cnt, uint8_t *ptr)
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{
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do
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{
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if ( u8g_WriteByteBWTo16GrDevice(u8g, dev, *ptr++) == 0 )
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return 0;
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cnt--;
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} while( cnt != 0 );
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return 1;
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}
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/* interpret b as a 4L bit pattern, write values 0x000, 0x004, 0x008, 0x00c */
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uint8_t u8g_WriteByte4LTo16GrDevice(u8g_t *u8g, u8g_dev_t *dev, uint8_t b)
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{
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//static uint8_t map[16] = { 0x000, 0x004, 0x008, 0x00c, 0x040, 0x044, 0x048, 0x04c, 0x080, 0x084, 0x088, 0x08c, 0x0c0, 0x0c4, 0x0c8, 0x0cc};
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//static uint8_t map[16] = { 0x000, 0x004, 0x00a, 0x00f, 0x040, 0x044, 0x04a, 0x04f, 0x0a0, 0x0a4, 0x0aa, 0x0af, 0x0f0, 0x0f4, 0x0fa, 0x0ff};
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static uint8_t map[16] = { 0x000, 0x040, 0x0a0, 0x0f0, 0x004, 0x044, 0x0a4, 0x0f4, 0x00a, 0x04a, 0x0aa, 0x0fa, 0x00f, 0x04f, 0x0af, 0x0ff};
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uint8_t bb;
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bb = b;
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bb &= 15;
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b>>=4;
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dev->com_fn(u8g, U8G_COM_MSG_WRITE_BYTE, map[bb], NULL);
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return dev->com_fn(u8g, U8G_COM_MSG_WRITE_BYTE, map[b], NULL);
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}
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uint8_t u8g_WriteSequence4LTo16GrDevice(u8g_t *u8g, u8g_dev_t *dev, uint8_t cnt, uint8_t *ptr)
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{
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do
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{
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if ( u8g_WriteByte4LTo16GrDevice(u8g, dev, *ptr++) == 0 )
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return 0;
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cnt--;
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} while( cnt != 0 );
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return 1;
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}
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