Diff: u8g_com_arduino_attiny85_hw_spi.c

Revision:

0:972874f31c98

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/u8g_com_arduino_attiny85_hw_spi.c	Wed Mar 07 12:49:14 2018 +0000
@@ -0,0 +1,160 @@
+/*
+  
+  u8g_arduino_ATtiny85_std_hw_spi.c
+
+  Universal 8bit Graphics Library
+  
+  Copyright (c) 2011, 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.  
+  
+*/
+
+// Uses code from tinySPI Written by Nick Gammon
+// March 2013
+
+// ATMEL ATTINY45 / ARDUINO pin mappings
+//
+//                         +-\/-+
+// RESET  Ain0 (D 5) PB5  1|    |8  Vcc
+// CLK1   Ain3 (D 3) PB3  2|    |7  PB2 (D 2) Ain1  SCK  / USCK / SCL
+// CLK0   Ain2 (D 4) PB4  3|    |6  PB1 (D 1) pwm1  MISO / DO
+//                   GND  4|    |5  PB0 (D 0) pwm0  MOSI / DI / SDA
+//                         +----+
+
+
+#include "u8g.h"
+
+
+#if defined(ARDUINO) && defined(__AVR_ATtiny85__)
+
+#if ARDUINO < 100 
+#include <WProgram.h>
+#else 
+#include <Arduino.h> 
+#endif
+
+const byte DI   = 0;  // D0, pin 5  Data In
+const byte DO   = 1;  // D1, pin 6  Data Out (this is *not* MOSI)
+const byte USCK = 2;  // D2, pin 7  Universal Serial Interface clock
+
+uint8_t u8g_arduino_ATtiny85_spi_out(uint8_t val)
+{
+  USIDR = val;  // byte to output
+  USISR = _BV (USIOIF);  // clear Counter Overflow Interrupt Flag, set count to zero 
+  do
+  {
+    USICR = _BV (USIWM0)   // 3-wire mode
+          | _BV (USICS1) | _BV (USICLK)  // Software clock strobe
+          | _BV (USITC);   // Toggle Clock Port Pin
+  }
+  while ((USISR & _BV (USIOIF)) == 0);  // until Counter Overflow Interrupt Flag set
+  
+  return USIDR;  // return read data
+}
+
+uint8_t u8g_com_arduino_ATtiny85_std_hw_spi_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_CS, HIGH);  // ensure SS stays high until needed
+      pinMode (USCK, OUTPUT);
+      pinMode (DO, OUTPUT);
+      pinMode (u8g->pin_list[U8G_PI_CS], OUTPUT);
+      pinMode (u8g->pin_list[U8G_PI_A0], OUTPUT);
+      USICR = _BV (USIWM0);  // 3-wire mode
+      u8g_MicroDelay();
+      break;
+    
+    case U8G_COM_MSG_STOP:
+      break;
+
+    case U8G_COM_MSG_RESET:
+      if ( u8g->pin_list[U8G_PI_RESET] != U8G_PIN_NONE )
+        u8g_com_arduino_digital_write(u8g, U8G_PI_RESET, arg_val);
+      break;
+      
+    case U8G_COM_MSG_CHIP_SELECT:
+      if ( arg_val == 0 )
+      {
+        /* disable */
+        u8g_MicroDelay();
+        u8g_com_arduino_digital_write(u8g, U8G_PI_CS, HIGH);
+        u8g_MicroDelay();
+      }
+      else
+      {
+        /* enable */
+        u8g_com_arduino_digital_write(u8g, U8G_PI_CS, LOW);
+        u8g_MicroDelay();
+      }
+      break;
+
+    case U8G_COM_MSG_WRITE_BYTE:
+      u8g_arduino_ATtiny85_spi_out(arg_val);
+      u8g_MicroDelay();
+      break;
+    
+    case U8G_COM_MSG_WRITE_SEQ:
+      {
+        register uint8_t *ptr = arg_ptr;
+        while( arg_val > 0 )
+        {
+          u8g_arduino_ATtiny85_spi_out(*ptr++);
+          arg_val--;
+        }
+      }
+      break;
+
+      case U8G_COM_MSG_WRITE_SEQ_P:
+      {
+        register uint8_t *ptr = arg_ptr;
+        while( arg_val > 0 )
+        {
+          u8g_arduino_ATtiny85_spi_out(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_com_arduino_digital_write(u8g, U8G_PI_A0, arg_val);
+      u8g_MicroDelay();
+      break;
+  }
+  return 1;
+}
+
+#else /* ARDUINO */
+
+uint8_t u8g_com_arduino_ATtiny85_std_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
+{
+  return 1;
+}
+
+#endif /* ARDUINO */