125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
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/*
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u8g_com_raspberrypi_hw_spi.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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Assumes, that
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MOSI is at PORTB, Pin 3
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and
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SCK is at PORTB, Pin 5
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Update for ATOMIC operation done (01 Jun 2013)
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U8G_ATOMIC_OR(ptr, val)
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U8G_ATOMIC_AND(ptr, val)
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U8G_ATOMIC_START()
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U8G_ATOMIC_END()
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*/
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#include "u8g.h"
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#if defined(U8G_RASPBERRY_PI)
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#include <wiringPiSPI.h>
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#include <wiringPi.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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uint8_t u8g_com_raspberrypi_hw_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_STOP:
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break;
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case U8G_COM_MSG_INIT:
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// check wiringPi setup
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if (wiringPiSetup() == -1)
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{
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printf("wiringPi-Error\n");
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exit(1);
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}
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if (wiringPiSPISetup (0, 100000) < 0)
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{
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printf ("Unable to open SPI device 0: %s\n", strerror (errno)) ;
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exit (1) ;
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}
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u8g_SetPIOutput(u8g, U8G_PI_RESET);
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u8g_SetPIOutput(u8g, U8G_PI_A0);
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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_A0, arg_val);
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break;
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case U8G_COM_MSG_CHIP_SELECT:
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/* Done by the SPI hardware */
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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_WRITE_BYTE:
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wiringPiSPIDataRW (0, &arg_val, 1) ;
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break;
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case U8G_COM_MSG_WRITE_SEQ:
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wiringPiSPIDataRW (0, arg_ptr, arg_val);
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break;
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case U8G_COM_MSG_WRITE_SEQ_P:
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wiringPiSPIDataRW (0, arg_ptr, 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_raspberrypi_hw_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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