Diff: u8g_com_atmega_parallel.c

Revision:

0:972874f31c98

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/u8g_com_atmega_parallel.c	Wed Mar 07 12:49:14 2018 +0000
@@ -0,0 +1,184 @@
+/*
+  
+  u8g_com_atmega_parallel.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.  
+  
+
+  PIN_D0 8
+  PIN_D1 9
+  PIN_D2 10
+  PIN_D3 11
+  PIN_D4 4
+  PIN_D5 5
+  PIN_D6 6
+  PIN_D7 7
+
+  PIN_CS1 14
+  PIN_CS2 15
+  PIN_RW 16
+  PIN_DI 17
+  PIN_EN 18
+  
+  u8g_Init8Bit(u8g, dev, d0, d1, d2, d3, d4, d5, d6, d7, en, cs1, cs2, di, rw, reset)
+  u8g_Init8Bit(u8g, dev,  8,    9, 10, 11,   4,   5,   6,   7, 18, 14, 15, 17, 16, U8G_PIN_NONE)
+
+*/
+
+#include "u8g.h"
+
+#if defined(__AVR__)
+
+static void u8g_com_atmega_parallel_write(u8g_t *u8g, uint8_t val) U8G_NOINLINE;
+static void u8g_com_atmega_parallel_write(u8g_t *u8g, uint8_t val)
+{
+
+  u8g_SetPILevel(u8g, U8G_PI_D0, val&1);
+  val >>= 1;
+  u8g_SetPILevel(u8g, U8G_PI_D1, val&1);
+  val >>= 1;
+  u8g_SetPILevel(u8g, U8G_PI_D2, val&1);
+  val >>= 1;
+  u8g_SetPILevel(u8g, U8G_PI_D3, val&1);
+  val >>= 1;
+  u8g_SetPILevel(u8g, U8G_PI_D4, val&1);
+  val >>= 1;
+  u8g_SetPILevel(u8g, U8G_PI_D5, val&1);
+  val >>= 1;
+  u8g_SetPILevel(u8g, U8G_PI_D6, val&1);
+  val >>= 1;
+  u8g_SetPILevel(u8g, U8G_PI_D7, val&1);
+  
+  /* EN cycle time must be 1 micro second  */
+  u8g_SetPILevel(u8g, U8G_PI_EN, 1);
+  u8g_MicroDelay(); /* delay by 1000ns, reference: ST7920: 140ns, SBN1661: 100ns */
+  u8g_SetPILevel(u8g, U8G_PI_EN, 0);
+  u8g_10MicroDelay(); /* ST7920 commands: 72us */
+  u8g_10MicroDelay(); /* ST7920 commands: 72us */
+}
+
+
+uint8_t u8g_com_atmega_parallel_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
+{
+  switch(msg)
+  {
+    case U8G_COM_MSG_INIT:
+      /* setup the RW pin as output and force it to low */
+      u8g_SetPIOutput(u8g, U8G_PI_RW);
+      u8g_SetPILevel(u8g, U8G_PI_RW, 0);
+
+      u8g_SetPIOutput(u8g, U8G_PI_D0);
+      u8g_SetPIOutput(u8g, U8G_PI_D1);
+      u8g_SetPIOutput(u8g, U8G_PI_D2);
+      u8g_SetPIOutput(u8g, U8G_PI_D3);
+      u8g_SetPIOutput(u8g, U8G_PI_D4);
+      u8g_SetPIOutput(u8g, U8G_PI_D5);
+      u8g_SetPIOutput(u8g, U8G_PI_D6);
+      u8g_SetPIOutput(u8g, U8G_PI_D7);
+      u8g_SetPIOutput(u8g, U8G_PI_EN);
+      u8g_SetPIOutput(u8g, U8G_PI_CS1);
+      u8g_SetPIOutput(u8g, U8G_PI_CS2);
+      u8g_SetPIOutput(u8g, U8G_PI_DI);
+      u8g_SetPILevel(u8g, U8G_PI_CS1, 1);
+      u8g_SetPILevel(u8g, U8G_PI_CS2, 1);
+
+      break;
+    case U8G_COM_MSG_STOP:
+      break;
+    case U8G_COM_MSG_CHIP_SELECT:
+      if ( arg_val == 0 )
+      {
+        /* disable */
+        u8g_SetPILevel(u8g, U8G_PI_CS1, 1);
+        u8g_SetPILevel(u8g, U8G_PI_CS2, 1);
+      }
+      else if ( arg_val == 1 )
+      {
+        /* enable */
+        u8g_SetPILevel(u8g, U8G_PI_CS1, 0);
+        u8g_SetPILevel(u8g, U8G_PI_CS2, 1);
+      }
+      else if ( arg_val == 2 )
+      {
+        /* enable */
+        u8g_SetPILevel(u8g, U8G_PI_CS1, 1);
+        u8g_SetPILevel(u8g, U8G_PI_CS2, 0);
+      }
+      else
+      {
+        /* enable */
+        u8g_SetPILevel(u8g, U8G_PI_CS1, 0);
+        u8g_SetPILevel(u8g, U8G_PI_CS2, 0);
+      }
+      break;
+    case U8G_COM_MSG_WRITE_BYTE:
+      u8g_com_atmega_parallel_write(u8g, arg_val);
+      break;
+    case U8G_COM_MSG_WRITE_SEQ:
+      {
+        register uint8_t *ptr = arg_ptr;
+        while( arg_val > 0 )
+        {
+          u8g_com_atmega_parallel_write(u8g, *ptr++);
+          arg_val--;
+        }
+      }
+      break;
+    case U8G_COM_MSG_WRITE_SEQ_P:
+      {
+        register uint8_t *ptr = arg_ptr;
+        while( arg_val > 0 )
+        {
+          u8g_com_atmega_parallel_write(u8g, u8g_pgm_read(ptr));
+          ptr++;
+          arg_val--;
+        }
+      }
+      break;
+    case U8G_COM_MSG_ADDRESS:                     /* define cmd (arg_val = 0) or data mode (arg_val = 1) */
+      u8g_SetPILevel(u8g, U8G_PI_DI, arg_val);
+      break;
+    case U8G_COM_MSG_RESET:
+      u8g_SetPILevel(u8g, U8G_PI_RESET, arg_val);
+      break;
+  }
+  return 1;
+}
+
+#else
+
+uint8_t u8g_com_atmega_parallel_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
+{
+  return 1;
+}
+
+#endif /* ARDUINO */
+
+