Diff: u8glibARM/u8g_com_raspberrypi_hw_spi.c

Revision:

0:d8f4c441e032

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/u8glibARM/u8g_com_raspberrypi_hw_spi.c	Fri Jun 10 15:20:20 2016 +0000
@@ -0,0 +1,125 @@
+/*
+  
+  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
+
+
+