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171 lines
4.8 KiB
171 lines
4.8 KiB
12 years ago
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/*
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u8g_com_atmega_st7920_spi.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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A special SPI interface for ST7920 controller
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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_atmega_st7920_sw_spi_shift_out(u8g_t *u8g, uint8_t val) U8G_NOINLINE;
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static void u8g_atmega_st7920_sw_spi_shift_out(u8g_t *u8g, uint8_t val)
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{
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uint8_t i = 8;
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do
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{
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u8g_SetPILevel(u8g, U8G_PI_MOSI, val & 128 );
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val <<= 1;
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u8g_SetPILevel(u8g, U8G_PI_SCK, 1 );
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u8g_MicroDelay(); /* 15 Aug 2012: added for high speed uC */
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u8g_SetPILevel(u8g, U8G_PI_SCK, 0 );
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u8g_MicroDelay(); /* 15 Aug 2012: added for high speed uC */
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i--;
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} while( i != 0 );
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}
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static void u8g_com_atmega_st7920_write_byte(u8g_t *u8g, uint8_t rs, uint8_t val) U8G_NOINLINE;
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static void u8g_com_atmega_st7920_write_byte(u8g_t *u8g, uint8_t rs, uint8_t val)
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{
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uint8_t i;
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if ( rs == 0 )
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{
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/* command */
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u8g_atmega_st7920_sw_spi_shift_out(u8g, 0x0f8);
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}
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else if ( rs == 1 )
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{
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/* data */
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u8g_atmega_st7920_sw_spi_shift_out(u8g, 0x0fa);
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}
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u8g_atmega_st7920_sw_spi_shift_out(u8g, val & 0x0f0);
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u8g_atmega_st7920_sw_spi_shift_out(u8g, val << 4);
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for( i = 0; i < 4; i++ )
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u8g_10MicroDelay();
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}
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uint8_t u8g_com_atmega_st7920_sw_spi_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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u8g_SetPIOutput(u8g, U8G_PI_SCK);
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u8g_SetPIOutput(u8g, U8G_PI_MOSI);
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/* u8g_SetPIOutput(u8g, U8G_PI_A0); */
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u8g_SetPIOutput(u8g, U8G_PI_CS);
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u8g_SetPIOutput(u8g, U8G_PI_RESET);
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u8g_SetPILevel(u8g, U8G_PI_SCK, 0 );
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u8g_SetPILevel(u8g, U8G_PI_MOSI, 0 );
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u8g_SetPILevel(u8g, U8G_PI_CS, 0 );
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/* u8g_SetPILevel(u8g, U8G_PI_A0, 0); */
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u8g->pin_list[U8G_PI_A0_STATE] = 0; /* inital RS state: command mode */
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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_RESET:
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u8g_SetPILevel(u8g, U8G_PI_RESET, arg_val);
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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->pin_list[U8G_PI_A0_STATE] = arg_val;
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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, note: the st7920 has an active high chip select */
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u8g_SetPILevel(u8g, U8G_PI_CS, 0);
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}
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else
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{
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/* u8g_SetPILevel(u8g, U8G_PI_SCK, 0 ); */
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/* enable */
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u8g_SetPILevel(u8g, U8G_PI_CS, 1); /* CS = 1 (high active) */
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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_st7920_write_byte(u8g, u8g->pin_list[U8G_PI_A0_STATE], arg_val);
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u8g->pin_list[U8G_PI_A0_STATE] = 2;
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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_st7920_write_byte(u8g, u8g->pin_list[U8G_PI_A0_STATE], *ptr++);
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u8g->pin_list[U8G_PI_A0_STATE] = 2;
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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_st7920_write_byte(u8g, u8g->pin_list[U8G_PI_A0_STATE], u8g_pgm_read(ptr));
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u8g->pin_list[U8G_PI_A0_STATE] = 2;
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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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}
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return 1;
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}
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#else
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uint8_t u8g_com_atmega_st7920_sw_spi_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
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