Diff: u8g_com_arduino_st7920_hw_spi.c

Revision:

0:972874f31c98

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/u8g_com_arduino_st7920_hw_spi.c	Wed Mar 07 12:49:14 2018 +0000
@@ -0,0 +1,294 @@
+/*
+  
+  u8g_com_arduino_st7920_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.  
+
+  A special HW SPI interface for ST7920 controller
+
+*/
+
+#include "u8g.h"
+
+#if defined(ARDUINO)
+
+#if ARDUINO < 100 
+#include <WProgram.h>    
+#include "wiring_private.h"
+#include "pins_arduino.h"
+
+#else 
+#include <Arduino.h> 
+#include "wiring_private.h"
+#endif
+
+#if defined(__AVR__)
+#define U8G_ARDUINO_ATMEGA_HW_SPI
+
+/* remove the definition for attiny */
+#if __AVR_ARCH__ == 2
+#undef U8G_ARDUINO_ATMEGA_HW_SPI
+#endif
+#if __AVR_ARCH__ == 25
+#undef U8G_ARDUINO_ATMEGA_HW_SPI
+#endif
+
+#endif
+
+
+#if defined(U8G_ARDUINO_ATMEGA_HW_SPI)
+
+#include <avr/interrupt.h>
+#include <avr/io.h>
+
+
+#if ARDUINO < 100 
+
+/* fixed pins */
+#if defined(__AVR_ATmega644P__) || defined(__AVR_ATmega1284P__) // Sanguino.cc board
+#define PIN_SCK         7
+#define PIN_MISO        6
+#define PIN_MOSI        5
+#define PIN_CS          4
+#else                                   // Arduino Board
+#define PIN_SCK 13
+#define PIN_MISO  12
+#define PIN_MOSI 11
+#define PIN_CS 10
+#endif // (__AVR_ATmega644P__) || defined(__AVR_ATmega1284P__)
+
+#else 
+
+/* use Arduino pin definitions */
+#define PIN_SCK SCK
+#define PIN_MISO  MISO
+#define PIN_MOSI MOSI
+#define PIN_CS SS
+
+#endif
+
+
+static uint8_t u8g_arduino_st7920_hw_spi_shift_out(u8g_t *u8g, uint8_t val) U8G_NOINLINE;
+static uint8_t u8g_arduino_st7920_hw_spi_shift_out(u8g_t *u8g, uint8_t val)
+{
+  /* send data */
+  SPDR = val;
+  /* wait for transmission */
+  while (!(SPSR & (1<<SPIF))) 
+    ;
+  /* clear the SPIF flag by reading SPDR */
+  return  SPDR;
+}
+
+
+static void u8g_com_arduino_st7920_write_byte_hw_spi_seq(u8g_t *u8g, uint8_t rs, uint8_t *ptr, uint8_t len)
+{
+  uint8_t i;
+
+  if ( rs == 0 )
+  {
+    /* command */
+    u8g_arduino_st7920_hw_spi_shift_out(u8g, 0x0f8);
+  }
+  else if ( rs == 1 )
+  {
+    /* data */
+    u8g_arduino_st7920_hw_spi_shift_out(u8g, 0x0fa);
+  }
+
+  while( len > 0 )
+  {
+    u8g_arduino_st7920_hw_spi_shift_out(u8g, *ptr & 0x0f0);
+    u8g_arduino_st7920_hw_spi_shift_out(u8g, *ptr << 4);
+    ptr++;
+    len--;
+    u8g_10MicroDelay();
+  }
+  
+  for( i = 0; i < 4; i++ )
+    u8g_10MicroDelay();
+}
+
+static void u8g_com_arduino_st7920_write_byte_hw_spi(u8g_t *u8g, uint8_t rs, uint8_t val) U8G_NOINLINE;
+static void u8g_com_arduino_st7920_write_byte_hw_spi(u8g_t *u8g, uint8_t rs, uint8_t val)
+{
+  uint8_t i;
+
+  if ( rs == 0 )
+  {
+    /* command */
+    u8g_arduino_st7920_hw_spi_shift_out(u8g, 0x0f8);
+  }
+  else if ( rs == 1 )
+  {
+    /* data */
+    u8g_arduino_st7920_hw_spi_shift_out(u8g, 0x0fa);
+  }
+  else
+  {
+    /* do nothing, keep same state */
+  }
+  
+  u8g_arduino_st7920_hw_spi_shift_out(u8g, val & 0x0f0);
+  u8g_arduino_st7920_hw_spi_shift_out(u8g, val << 4);
+
+  for( i = 0; i < 4; i++ )
+    u8g_10MicroDelay();
+}
+
+
+uint8_t u8g_com_arduino_st7920_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_assign_pin_output_high(u8g);
+      
+      
+      /* code from u8g_com-arduino_hw_spi.c */
+      pinMode(PIN_SCK, OUTPUT);
+      digitalWrite(PIN_SCK, LOW);
+      pinMode(PIN_MOSI, OUTPUT);
+      digitalWrite(PIN_MOSI, LOW);
+      /* pinMode(PIN_MISO, INPUT); */
+
+      pinMode(PIN_CS, OUTPUT);			/* system chip select for the atmega board */
+      digitalWrite(PIN_CS, HIGH);
+      
+      
+      //u8g_com_arduino_digital_write(u8g, U8G_PI_CS, LOW);
+      
+#ifdef OBSOLETE      
+      DDRB |= _BV(3);          /* D0, MOSI */
+      DDRB |= _BV(5);          /* SCK */
+      DDRB |= _BV(2);		/* slave select */
+    
+      PORTB &= ~_BV(3);        /* D0, MOSI = 0 */
+      PORTB &= ~_BV(5);        /* SCK = 0 */
+#endif
+
+      /*
+        SPR1 SPR0
+            0	0		fclk/4
+            0	1		fclk/16 
+            1	0		fclk/64  
+            1	1		fclk/128
+      */
+      SPCR = 0;
+      
+      /* 20 Dez 2012: set CPOL and CPHA to 1 !!! */
+      SPCR =  (1<<SPE) | (1<<MSTR)|(0<<SPR1)|(0<<SPR0)|(1<<CPOL)|(1<<CPHA);
+#ifdef U8G_HW_SPI_2X
+      SPSR = (1 << SPI2X);  /* double speed, issue 89 */
+#endif
+      u8g->pin_list[U8G_PI_A0_STATE] = 0;       /* inital RS state: command mode */
+      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, note: the st7920 has an active high chip select */
+        u8g_com_arduino_digital_write(u8g, U8G_PI_CS, LOW);
+      }
+      else
+      {
+        /* enable */
+        //u8g_com_arduino_digital_write(u8g, U8G_PI_SCK, LOW);
+        u8g_com_arduino_digital_write(u8g, U8G_PI_CS, HIGH);
+      }
+      break;
+
+    case U8G_COM_MSG_WRITE_BYTE:
+      u8g_com_arduino_st7920_write_byte_hw_spi(u8g,  u8g->pin_list[U8G_PI_A0_STATE], arg_val);
+      // u8g->pin_list[U8G_PI_A0_STATE] = 2; 
+      //u8g_arduino_sw_spi_shift_out(u8g->pin_list[U8G_PI_MOSI], u8g->pin_list[U8G_PI_SCK], arg_val);
+      break;
+    
+    case U8G_COM_MSG_WRITE_SEQ:
+      u8g_com_arduino_st7920_write_byte_hw_spi_seq(u8g, u8g->pin_list[U8G_PI_A0_STATE], (uint8_t *)arg_ptr, arg_val);
+      /*
+      {
+        register uint8_t *ptr = arg_ptr;
+        while( arg_val > 0 )
+        {
+          u8g_com_arduino_st7920_write_byte_hw_spi(u8g, u8g->pin_list[U8G_PI_A0_STATE], *ptr++);
+          arg_val--;
+        }
+      }
+      */
+      
+      break;
+
+      case U8G_COM_MSG_WRITE_SEQ_P:
+      {
+        register uint8_t *ptr = arg_ptr;
+        while( arg_val > 0 )
+        {
+          u8g_com_arduino_st7920_write_byte_hw_spi(u8g, u8g->pin_list[U8G_PI_A0_STATE], u8g_pgm_read(ptr) );
+          // u8g->pin_list[U8G_PI_A0_STATE] = 2; 
+          ptr++;
+          arg_val--;
+        }
+      }
+      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;
+      break;
+  }
+  return 1;
+}
+
+#else
+
+uint8_t u8g_com_arduino_st7920_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
+{
+  return 1;
+}
+#endif
+
+#else /* ARDUINO */
+
+uint8_t u8g_com_arduino_st7920_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
+{
+  return 1;
+}
+
+#endif /* ARDUINO */
+
+