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- /*
-
- u8g_com_raspberrypi_hw_spi.c
- Universal 8bit Graphics Library
-
- Copyright (c) 2012, olikraus@gmail.com
- All rights reserved.
- Redistribution and use in source and binary forms, with or without modification,
- are permitted provided that the following conditions are met:
- * Redistributions of source code must retain the above copyright notice, this list
- of conditions and the following disclaimer.
-
- * Redistributions in binary form must reproduce the above copyright notice, this
- list of conditions and the following disclaimer in the documentation and/or other
- materials provided with the distribution.
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
- Assumes, that
- MOSI is at PORTB, Pin 3
- and
- SCK is at PORTB, Pin 5
- Update for ATOMIC operation done (01 Jun 2013)
- U8G_ATOMIC_OR(ptr, val)
- U8G_ATOMIC_AND(ptr, val)
- U8G_ATOMIC_START()
- U8G_ATOMIC_END()
-
- */
- #include "u8g.h"
- #if defined(U8G_RASPBERRY_PI)
- #include <wiringPiSPI.h>
- #include <wiringPi.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <errno.h>
- uint8_t u8g_com_raspberrypi_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
- {
- switch(msg)
- {
- case U8G_COM_MSG_STOP:
- break;
-
- case U8G_COM_MSG_INIT:
- // check wiringPi setup
- if (wiringPiSetup() == -1)
- {
- printf("wiringPi-Error\n");
- exit(1);
- }
- if (wiringPiSPISetup (0, 100000) < 0)
- {
- printf ("Unable to open SPI device 0: %s\n", strerror (errno)) ;
- exit (1) ;
- }
-
- u8g_SetPIOutput(u8g, U8G_PI_RESET);
- u8g_SetPIOutput(u8g, U8G_PI_A0);
- break;
-
- case U8G_COM_MSG_ADDRESS: /* define cmd (arg_val = 0) or data mode (arg_val = 1) */
- u8g_SetPILevel(u8g, U8G_PI_A0, arg_val);
- break;
- case U8G_COM_MSG_CHIP_SELECT:
- /* Done by the SPI hardware */
- break;
-
- case U8G_COM_MSG_RESET:
- u8g_SetPILevel(u8g, U8G_PI_RESET, arg_val);
- break;
-
- case U8G_COM_MSG_WRITE_BYTE:
- wiringPiSPIDataRW (0, &arg_val, 1) ;
- break;
-
- case U8G_COM_MSG_WRITE_SEQ:
- wiringPiSPIDataRW (0, arg_ptr, arg_val);
- break;
- case U8G_COM_MSG_WRITE_SEQ_P:
- wiringPiSPIDataRW (0, arg_ptr, arg_val);
- break;
- }
- return 1;
- }
- #else
- uint8_t u8g_com_raspberrypi_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
- {
- return 1;
- }
- #endif
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