Diff: u8g_com_arduino_st7920_spi.c

Revision:

0:972874f31c98

diff -r 000000000000 -r 972874f31c98 u8g_com_arduino_st7920_spi.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/u8g_com_arduino_st7920_spi.c	Wed Mar 07 12:49:14 2018 +0000
@@ -0,0 +1,328 @@
+/*
+  
+  u8g_com_arduino_st7920_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 SPI interface for ST7920 controller
+
+  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(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__)
+
+uint8_t u8g_bitData, u8g_bitNotData;
+uint8_t u8g_bitClock, u8g_bitNotClock;
+volatile uint8_t *u8g_outData;
+volatile uint8_t *u8g_outClock;
+
+static void u8g_com_arduino_init_shift_out(uint8_t dataPin, uint8_t clockPin)
+{
+  u8g_outData = portOutputRegister(digitalPinToPort(dataPin));
+  u8g_outClock = portOutputRegister(digitalPinToPort(clockPin));
+  u8g_bitData = digitalPinToBitMask(dataPin);
+  u8g_bitClock = digitalPinToBitMask(clockPin);
+
+  u8g_bitNotClock = u8g_bitClock;
+  u8g_bitNotClock ^= 0x0ff;
+
+  u8g_bitNotData = u8g_bitData;
+  u8g_bitNotData ^= 0x0ff;
+}
+
+static void u8g_com_arduino_do_shift_out_msb_first(uint8_t val) U8G_NOINLINE;
+static void u8g_com_arduino_do_shift_out_msb_first(uint8_t val)
+{
+  uint8_t cnt = 8;
+  uint8_t bitData = u8g_bitData;
+  uint8_t bitNotData = u8g_bitNotData;
+  uint8_t bitClock = u8g_bitClock;
+  uint8_t bitNotClock = u8g_bitNotClock;
+  volatile uint8_t *outData = u8g_outData;
+  volatile uint8_t *outClock = u8g_outClock;
+  
+  
+  U8G_ATOMIC_START();
+  bitData |= *outData;
+  bitNotData &= *outData;
+  do
+  {
+    if ( val & 128 )
+      *outData = bitData;
+    else
+      *outData = bitNotData;
+
+    /*
+    *outClock |= bitClock;
+    val <<= 1;
+    cnt--;
+    *outClock &= bitNotClock;
+    */
+
+    val <<= 1;
+    *outClock &= bitNotClock;
+    cnt--;
+    // removed micro delays, because AVRs are too slow and the delay is not required
+    //u8g_MicroDelay();
+    *outClock |= bitClock;
+    //u8g_MicroDelay();
+  } while( cnt != 0 );
+  U8G_ATOMIC_END();
+}
+
+#elif defined(__18CXX) || defined(__PIC32MX)
+
+uint16_t dog_bitData, dog_bitNotData;
+uint16_t dog_bitClock, dog_bitNotClock;
+volatile uint32_t *dog_outData;
+volatile uint32_t *dog_outClock;
+volatile uint32_t dog_pic32_spi_tmp;
+
+static void u8g_com_arduino_init_shift_out(uint8_t dataPin, uint8_t clockPin)
+{
+  dog_outData = portOutputRegister(digitalPinToPort(dataPin));
+  dog_outClock = portOutputRegister(digitalPinToPort(clockPin));
+  dog_bitData = digitalPinToBitMask(dataPin);
+  dog_bitClock = digitalPinToBitMask(clockPin);
+
+  dog_bitNotClock = dog_bitClock;
+  dog_bitNotClock ^= 0x0ffff;
+
+  dog_bitNotData = dog_bitData;
+  dog_bitNotData ^= 0x0ffff;
+}
+
+static void u8g_com_arduino_do_shift_out_msb_first(uint8_t val)
+{
+  uint8_t cnt = 8;
+  U8G_ATOMIC_START();
+  do
+  {
+    if ( val & 128 )
+	*dog_outData |= dog_bitData;
+    else
+	*dog_outData &= dog_bitNotData;    
+    val <<= 1;
+    //u8g_MicroDelay();
+    //*dog_outClock |= dog_bitClock;
+    *dog_outClock &= dog_bitNotClock;
+    cnt--;
+    u8g_MicroDelay();
+    //*dog_outClock &= dog_bitNotClock;
+    *dog_outClock |= dog_bitClock;
+    u8g_MicroDelay();
+    
+  } while( cnt != 0 );
+  U8G_ATOMIC_END();
+}
+
+#else
+
+/* default interface, Arduino DUE (__arm__) */
+
+uint8_t u8g_data_pin;
+uint8_t u8g_clock_pin;
+
+static void u8g_com_arduino_init_shift_out(uint8_t dataPin, uint8_t clockPin)
+{
+  u8g_data_pin = dataPin;
+  u8g_clock_pin = clockPin;
+}
+
+static void u8g_com_arduino_do_shift_out_msb_first(uint8_t val)
+{
+  uint8_t cnt = 8;
+  do
+  {
+    if ( val & 128 )
+	digitalWrite(u8g_data_pin, HIGH);
+    else
+	digitalWrite(u8g_data_pin, LOW);
+    val <<= 1;
+    //u8g_MicroDelay();
+    digitalWrite(u8g_clock_pin, LOW);
+    cnt--;
+    u8g_MicroDelay();
+    digitalWrite(u8g_clock_pin, HIGH);
+    u8g_MicroDelay();    
+  } while( cnt != 0 );
+}
+
+#endif 
+
+
+static void u8g_com_arduino_st7920_write_byte_seq(uint8_t rs, uint8_t *ptr, uint8_t len)
+{
+  uint8_t i;
+
+  if ( rs == 0 )
+  {
+    /* command */
+    u8g_com_arduino_do_shift_out_msb_first(0x0f8);
+  }
+  else if ( rs == 1 )
+  {
+    /* data */
+    u8g_com_arduino_do_shift_out_msb_first(0x0fa);
+  }
+
+  while( len > 0 )
+  {
+    u8g_com_arduino_do_shift_out_msb_first(*ptr & 0x0f0);
+    u8g_com_arduino_do_shift_out_msb_first(*ptr << 4);
+    ptr++;
+    len--;
+    u8g_10MicroDelay();
+  }
+  
+  for( i = 0; i < 4; i++ )
+    u8g_10MicroDelay();
+}
+
+static void u8g_com_arduino_st7920_write_byte(uint8_t rs, uint8_t val)
+{
+  uint8_t i;
+
+  if ( rs == 0 )
+  {
+    /* command */
+    u8g_com_arduino_do_shift_out_msb_first(0x0f8);
+  }
+  else if ( rs == 1 )
+  {
+    /* data */
+    u8g_com_arduino_do_shift_out_msb_first(0x0fa);
+  }
+  
+  u8g_com_arduino_do_shift_out_msb_first(val & 0x0f0);
+  u8g_com_arduino_do_shift_out_msb_first(val << 4);
+  
+  for( i = 0; i < 4; i++ )
+    u8g_10MicroDelay();
+    
+}
+
+
+uint8_t u8g_com_arduino_st7920_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);
+      u8g_com_arduino_digital_write(u8g, U8G_PI_CS, LOW);
+      // u8g_com_arduino_digital_write(u8g, U8G_PI_SCK, LOW);
+      u8g_com_arduino_digital_write(u8g, U8G_PI_SCK, HIGH);
+      u8g_com_arduino_digital_write(u8g, U8G_PI_MOSI, LOW);
+      u8g_com_arduino_init_shift_out(u8g->pin_list[U8G_PI_MOSI], u8g->pin_list[U8G_PI_SCK]);
+      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, HIGH);
+        u8g_com_arduino_digital_write(u8g, U8G_PI_CS, HIGH);
+      }
+      break;
+
+    case U8G_COM_MSG_WRITE_BYTE:
+      u8g_com_arduino_st7920_write_byte( 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_seq(u8g->pin_list[U8G_PI_A0_STATE], (uint8_t *)arg_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(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 /* ARDUINO */
+
+uint8_t u8g_com_arduino_st7920_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
+{
+  return 1;
+}
+
+#endif /* ARDUINO */
+
+