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/*
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u8g_com_atmega_parallel.c
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Universal 8bit Graphics Library
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Copyright (c) 2012, 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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PIN_D0 8
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PIN_D1 9
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PIN_D2 10
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PIN_D3 11
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PIN_D4 4
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PIN_D5 5
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PIN_D6 6
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PIN_D7 7
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PIN_CS1 14
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PIN_CS2 15
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PIN_RW 16
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PIN_DI 17
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PIN_EN 18
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u8g_Init8Bit(u8g, dev, d0, d1, d2, d3, d4, d5, d6, d7, en, cs1, cs2, di, rw, reset)
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u8g_Init8Bit(u8g, dev, 8, 9, 10, 11, 4, 5, 6, 7, 18, 14, 15, 17, 16, U8G_PIN_NONE)
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*/
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#include "u8g.h"
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#if defined(__AVR__)
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static void u8g_com_atmega_parallel_write(u8g_t *u8g, uint8_t val) U8G_NOINLINE;
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static void u8g_com_atmega_parallel_write(u8g_t *u8g, uint8_t val)
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{
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u8g_SetPILevel(u8g, U8G_PI_D0, val&1);
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val >>= 1;
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u8g_SetPILevel(u8g, U8G_PI_D1, val&1);
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val >>= 1;
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u8g_SetPILevel(u8g, U8G_PI_D2, val&1);
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val >>= 1;
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u8g_SetPILevel(u8g, U8G_PI_D3, val&1);
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val >>= 1;
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u8g_SetPILevel(u8g, U8G_PI_D4, val&1);
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val >>= 1;
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u8g_SetPILevel(u8g, U8G_PI_D5, val&1);
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val >>= 1;
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u8g_SetPILevel(u8g, U8G_PI_D6, val&1);
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val >>= 1;
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u8g_SetPILevel(u8g, U8G_PI_D7, val&1);
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/* EN cycle time must be 1 micro second */
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u8g_SetPILevel(u8g, U8G_PI_EN, 1);
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u8g_MicroDelay(); /* delay by 1000ns, reference: ST7920: 140ns, SBN1661: 100ns */
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u8g_SetPILevel(u8g, U8G_PI_EN, 0);
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u8g_10MicroDelay(); /* ST7920 commands: 72us */
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u8g_10MicroDelay(); /* ST7920 commands: 72us */
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}
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uint8_t u8g_com_atmega_parallel_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
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{
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switch(msg)
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{
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case U8G_COM_MSG_INIT:
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/* setup the RW pin as output and force it to low */
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u8g_SetPIOutput(u8g, U8G_PI_RW);
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u8g_SetPILevel(u8g, U8G_PI_RW, 0);
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u8g_SetPIOutput(u8g, U8G_PI_D0);
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u8g_SetPIOutput(u8g, U8G_PI_D1);
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u8g_SetPIOutput(u8g, U8G_PI_D2);
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u8g_SetPIOutput(u8g, U8G_PI_D3);
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u8g_SetPIOutput(u8g, U8G_PI_D4);
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u8g_SetPIOutput(u8g, U8G_PI_D5);
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u8g_SetPIOutput(u8g, U8G_PI_D6);
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u8g_SetPIOutput(u8g, U8G_PI_D7);
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u8g_SetPIOutput(u8g, U8G_PI_EN);
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u8g_SetPIOutput(u8g, U8G_PI_CS1);
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u8g_SetPIOutput(u8g, U8G_PI_CS2);
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u8g_SetPIOutput(u8g, U8G_PI_DI);
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u8g_SetPILevel(u8g, U8G_PI_CS1, 1);
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u8g_SetPILevel(u8g, U8G_PI_CS2, 1);
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break;
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case U8G_COM_MSG_STOP:
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break;
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case U8G_COM_MSG_CHIP_SELECT:
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if ( arg_val == 0 )
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{
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/* disable */
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u8g_SetPILevel(u8g, U8G_PI_CS1, 1);
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u8g_SetPILevel(u8g, U8G_PI_CS2, 1);
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}
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else if ( arg_val == 1 )
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{
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/* enable */
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u8g_SetPILevel(u8g, U8G_PI_CS1, 0);
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u8g_SetPILevel(u8g, U8G_PI_CS2, 1);
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}
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else if ( arg_val == 2 )
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{
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/* enable */
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u8g_SetPILevel(u8g, U8G_PI_CS1, 1);
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u8g_SetPILevel(u8g, U8G_PI_CS2, 0);
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}
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else
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{
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/* enable */
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u8g_SetPILevel(u8g, U8G_PI_CS1, 0);
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u8g_SetPILevel(u8g, U8G_PI_CS2, 0);
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}
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break;
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case U8G_COM_MSG_WRITE_BYTE:
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u8g_com_atmega_parallel_write(u8g, arg_val);
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break;
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case U8G_COM_MSG_WRITE_SEQ:
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{
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register uint8_t *ptr = arg_ptr;
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while( arg_val > 0 )
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{
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u8g_com_atmega_parallel_write(u8g, *ptr++);
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arg_val--;
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}
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}
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break;
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case U8G_COM_MSG_WRITE_SEQ_P:
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{
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register uint8_t *ptr = arg_ptr;
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while( arg_val > 0 )
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{
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u8g_com_atmega_parallel_write(u8g, u8g_pgm_read(ptr));
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ptr++;
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arg_val--;
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}
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}
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break;
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case U8G_COM_MSG_ADDRESS: /* define cmd (arg_val = 0) or data mode (arg_val = 1) */
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u8g_SetPILevel(u8g, U8G_PI_DI, arg_val);
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break;
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case U8G_COM_MSG_RESET:
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u8g_SetPILevel(u8g, U8G_PI_RESET, arg_val);
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break;
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}
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return 1;
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}
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#else
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uint8_t u8g_com_atmega_parallel_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
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{
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return 1;
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}
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#endif /* ARDUINO */
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