Diff: u8g_com_arduino_ssd_i2c.c

Revision:

0:972874f31c98

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/u8g_com_arduino_ssd_i2c.c	Wed Mar 07 12:49:14 2018 +0000
@@ -0,0 +1,213 @@
+/*
+  
+  u8g_com_arduino_ssd_i2c.c
+
+  com interface for arduino (AND atmega) and the SSDxxxx chip (SOLOMON) variant 
+  I2C protocol 
+  
+  ToDo: Rename this to u8g_com_avr_ssd_i2c.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.  
+  
+  Special pin usage:
+    U8G_PI_I2C_OPTION	additional options
+    U8G_PI_A0_STATE	used to store the last value of the command/data register selection
+    U8G_PI_SET_A0		1: Signal request to update I2C device with new A0_STATE, 0: Do nothing, A0_STATE matches I2C device
+    U8G_PI_SCL		clock line (NOT USED)
+    U8G_PI_SDA		data line (NOT USED)
+    
+    U8G_PI_RESET		reset line (currently disabled, see below)
+
+  Protocol:
+    SLA, Cmd/Data Selection, Arguments
+    The command/data register is selected by a special instruction byte, which is sent after SLA
+    
+    The continue bit is always 0 so that a (re)start is equired for the change from cmd to/data mode
+*/
+
+#include "u8g.h"
+
+#define I2C_SLA		(0x3c*2)
+//#define I2C_CMD_MODE	0x080
+#define I2C_CMD_MODE	0x000
+#define I2C_DATA_MODE	0x040
+
+#if defined(U8G_WITH_PINLIST)
+
+uint8_t u8g_com_arduino_ssd_start_sequence(u8g_t *u8g)
+{
+  /* are we requested to set the a0 state? */
+  if ( u8g->pin_list[U8G_PI_SET_A0] == 0 )
+    return 1;	
+  
+  /* setup bus, might be a repeated start */
+  if ( u8g_i2c_start(I2C_SLA) == 0 )
+    return 0;
+  if ( u8g->pin_list[U8G_PI_A0_STATE] == 0 )
+  {
+    if ( u8g_i2c_send_byte(I2C_CMD_MODE) == 0 )
+      return 0;
+  }
+  else
+  {
+    if ( u8g_i2c_send_byte(I2C_DATA_MODE) == 0 )
+      return 0;
+  }
+  
+  
+  u8g->pin_list[U8G_PI_SET_A0] = 0;
+  return 1;
+}
+
+uint8_t u8g_com_arduino_ssd_i2c_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
+{
+  switch(msg)
+  {
+    case U8G_COM_MSG_INIT:
+      //u8g_com_arduino_digital_write(u8g, U8G_PI_SCL, HIGH);
+      //u8g_com_arduino_digital_write(u8g, U8G_PI_SDA, HIGH);
+      //u8g->pin_list[U8G_PI_A0_STATE] = 0;       /* inital RS state: unknown mode */
+    
+      u8g_i2c_init(u8g->pin_list[U8G_PI_I2C_OPTION]);
+
+      break;
+    
+    case U8G_COM_MSG_STOP:
+      break;
+
+    case U8G_COM_MSG_RESET:
+      /* Currently disabled, but it could be enable. Previous restrictions have been removed */
+      /* u8g_com_arduino_digital_write(u8g, U8G_PI_RESET, arg_val); */
+      break;
+      
+    case U8G_COM_MSG_CHIP_SELECT:
+      u8g->pin_list[U8G_PI_A0_STATE] = 0;
+      u8g->pin_list[U8G_PI_SET_A0] = 1;		/* force a0 to set again, also forces start condition */
+      if ( arg_val == 0 )
+      {
+        /* disable chip, send stop condition */
+	u8g_i2c_stop();
+     }
+      else
+      {
+        /* enable, do nothing: any byte writing will trigger the i2c start */
+      }
+      break;
+
+    case U8G_COM_MSG_WRITE_BYTE:
+      //u8g->pin_list[U8G_PI_SET_A0] = 1;
+      if ( u8g_com_arduino_ssd_start_sequence(u8g) == 0 )
+	return u8g_i2c_stop(), 0;
+      if ( u8g_i2c_send_byte(arg_val) == 0 )
+	return u8g_i2c_stop(), 0;
+      // u8g_i2c_stop();
+      break;
+    
+    case U8G_COM_MSG_WRITE_SEQ:
+      //u8g->pin_list[U8G_PI_SET_A0] = 1;
+      if ( u8g_com_arduino_ssd_start_sequence(u8g) == 0 )
+	return u8g_i2c_stop(), 0;
+      {
+        register uint8_t *ptr = arg_ptr;
+        while( arg_val > 0 )
+        {
+	  if ( u8g_i2c_send_byte(*ptr++) == 0 )
+	    return u8g_i2c_stop(), 0;
+          arg_val--;
+        }
+      }
+      // u8g_i2c_stop();
+      break;
+
+    case U8G_COM_MSG_WRITE_SEQ_P:
+      //u8g->pin_list[U8G_PI_SET_A0] = 1;
+      if ( u8g_com_arduino_ssd_start_sequence(u8g) == 0 )
+	return u8g_i2c_stop(), 0;
+      {
+        register uint8_t *ptr = arg_ptr;
+        while( arg_val > 0 )
+        {
+	  if ( u8g_i2c_send_byte(u8g_pgm_read(ptr)) == 0 )
+	    return 0;
+          ptr++;
+          arg_val--;
+        }
+      }
+      // u8g_i2c_stop();
+      break;
+      
+    case U8G_COM_MSG_ADDRESS:                     /* define cmd (arg_val = 0) or data mode (arg_val = 1) */
+      u8g->pin_list[U8G_PI_A0_STATE] = arg_val;
+      u8g->pin_list[U8G_PI_SET_A0] = 1;		/* force a0 to set again */
+    
+#ifdef OLD_CODE    
+      if ( i2c_state != 0 )
+      {
+	u8g_i2c_stop();
+	i2c_state = 0;
+      }
+
+      if ( u8g_com_arduino_ssd_start_sequence(arg_val) == 0 )
+	return 0;
+    
+      /* setup bus, might be a repeated start */
+      /*
+      if ( u8g_i2c_start(I2C_SLA) == 0 )
+	return 0;
+      if ( arg_val == 0 )
+      {
+	i2c_state = 1;
+	
+	if ( u8g_i2c_send_byte(I2C_CMD_MODE) == 0 )
+	  return 0;
+      }
+      else
+      {
+	i2c_state = 2;
+	if ( u8g_i2c_send_byte(I2C_DATA_MODE) == 0 )
+	  return 0;
+      }
+      */
+#endif
+      break;
+  }
+  return 1;
+}
+
+#else  /* defined(U8G_WITH_PINLIST) */
+
+uint8_t u8g_com_arduino_ssd_i2c_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
+{
+  return 1;
+}
+
+#endif /* defined(U8G_WITH_PINLIST) */
+
+