174 lines
4.4 KiB
C
174 lines
4.4 KiB
C
/*
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u8g_com_api.c
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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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uint8_t u8g_InitCom(u8g_t *u8g, u8g_dev_t *dev)
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{
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return dev->com_fn(u8g, U8G_COM_MSG_INIT, 0, NULL);
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}
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void u8g_StopCom(u8g_t *u8g, u8g_dev_t *dev)
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{
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dev->com_fn(u8g, U8G_COM_MSG_STOP, 0, NULL);
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}
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/* cs contains the chip number, which should be enabled */
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void u8g_SetChipSelect(u8g_t *u8g, u8g_dev_t *dev, uint8_t cs)
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{
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dev->com_fn(u8g, U8G_COM_MSG_CHIP_SELECT, cs, NULL);
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}
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void u8g_SetResetLow(u8g_t *u8g, u8g_dev_t *dev)
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{
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dev->com_fn(u8g, U8G_COM_MSG_RESET, 0, NULL);
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}
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void u8g_SetResetHigh(u8g_t *u8g, u8g_dev_t *dev)
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{
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dev->com_fn(u8g, U8G_COM_MSG_RESET, 1, NULL);
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}
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void u8g_SetAddress(u8g_t *u8g, u8g_dev_t *dev, uint8_t address)
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{
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dev->com_fn(u8g, U8G_COM_MSG_ADDRESS, address, NULL);
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}
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uint8_t u8g_WriteByte(u8g_t *u8g, u8g_dev_t *dev, uint8_t val)
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{
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return dev->com_fn(u8g, U8G_COM_MSG_WRITE_BYTE, val, NULL);
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}
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uint8_t u8g_WriteSequence(u8g_t *u8g, u8g_dev_t *dev, uint8_t cnt, uint8_t *seq)
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{
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return dev->com_fn(u8g, U8G_COM_MSG_WRITE_SEQ, cnt, seq);
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}
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uint8_t u8g_WriteSequenceP(u8g_t *u8g, u8g_dev_t *dev, uint8_t cnt, const uint8_t *seq)
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{
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return dev->com_fn(u8g, U8G_COM_MSG_WRITE_SEQ_P, cnt, (void *)seq);
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}
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/*
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sequence := { direct_value | escape_sequence }
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direct_value := 0..254
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escape_sequence := value_255 | sequence_end | delay | adr | cs | not_used
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value_255 := 255 255
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sequence_end = 255 254
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delay := 255 0..127
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adr := 255 0x0e0 .. 0x0ef
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cs := 255 0x0d0 .. 0x0df
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not_used := 255 101..254
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#define U8G_ESC_DLY(x) 255, ((x) & 0x7f)
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#define U8G_ESC_CS(x) 255, (0xd0 | ((x)&0x0f))
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#define U8G_ESC_ADR(x) 255, (0xe0 | ((x)&0x0f))
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#define U8G_ESC_VCC(x) 255, (0xbe | ((x)&0x01))
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#define U8G_ESC_END 255, 254
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#define U8G_ESC_255 255, 255
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#define U8G_ESC_RST(x) 255, (0xc0 | ((x)&0x0f))
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*/
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uint8_t u8g_WriteEscSeqP(u8g_t *u8g, u8g_dev_t *dev, const uint8_t *esc_seq)
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{
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uint8_t is_escape = 0;
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uint8_t value;
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for(;;)
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{
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value = u8g_pgm_read(esc_seq);
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if ( is_escape == 0 )
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{
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if ( value != 255 )
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{
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if ( u8g_WriteByte(u8g, dev, value) == 0 )
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return 0;
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}
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else
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{
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is_escape = 1;
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}
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}
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else
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{
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if ( value == 255 )
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{
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if ( u8g_WriteByte(u8g, dev, value) == 0 )
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return 0;
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}
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else if ( value == 254 )
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{
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break;
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}
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else if ( value >= 0x0f0 )
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{
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/* not yet used, do nothing */
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}
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else if ( value >= 0xe0 )
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{
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u8g_SetAddress(u8g, dev, value & 0x0f);
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}
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else if ( value >= 0xd0 )
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{
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u8g_SetChipSelect(u8g, dev, value & 0x0f);
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}
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else if ( value >= 0xc0 )
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{
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u8g_SetResetLow(u8g, dev);
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value &= 0x0f;
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value <<= 4;
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value+=2;
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u8g_Delay(value);
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u8g_SetResetHigh(u8g, dev);
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u8g_Delay(value);
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}
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else if ( value >= 0xbe )
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{
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/* not yet implemented */
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/* u8g_SetVCC(u8g, dev, value & 0x01); */
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}
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else if ( value <= 127 )
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{
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u8g_Delay(value);
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}
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is_escape = 0;
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}
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esc_seq++;
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}
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return 1;
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}
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