il3820_update.c

/*
 * @file il3820_update.c
 *
 * @author Matthew Matz & Roy Eltham
 *
 * @version 0.5
 *
 * @copyright Copyright (C) Parallax, Inc. 2018.  See end of file for
 * terms of use (MIT License).
 *
 * @brief Waveshare ePaper display bitmap driver, see il3820_h. for documentation.
 *
 * @detail Please submit bug reports, suggestions, and improvements to
 * this code to editor@parallax.com.
 */


#include "il3820.h"


void il3820_updateDisplay(screen_t *dev)
{

  int mask_cs =  (1 << dev->dev_id);
  int mask_sdi = (1 << dev->sdi_pin);
  int mask_clk = (1 << dev->clk_pin);
  int mask_dc =  (1 << dev->dc_pin);
  
  il3820_writeLockSet(dev->dev_id);

  il3820_spiWrite(mask_cs, mask_sdi, mask_clk, mask_dc, IL3820_SET_RAM_X_ADDRESS_POSITION, 0);
  
  /* x point must be the multiple of 8 or the last 3 bits will be ignored */
  il3820_spiWrite(mask_cs, mask_sdi, mask_clk, mask_dc, 0, 1);
  il3820_spiWrite(mask_cs, mask_sdi, mask_clk, mask_dc, ((dev->width - 1) >> 3) & 0xFF, 1);
  il3820_spiWrite(mask_cs, mask_sdi, mask_clk, mask_dc, IL3820_SET_RAM_Y_ADDRESS_POSITION, 0);
  il3820_spiWrite(mask_cs, mask_sdi, mask_clk, mask_dc, 0, 1);
  il3820_spiWrite(mask_cs, mask_sdi, mask_clk, mask_dc, 0, 1);
  il3820_spiWrite(mask_cs, mask_sdi, mask_clk, mask_dc, (dev->height - 1) & 0xFF, 1);
  il3820_spiWrite(mask_cs, mask_sdi, mask_clk, mask_dc, ((dev->height - 1) >> 8) & 0xFF, 1);
  il3820_spiWrite(mask_cs, mask_sdi, mask_clk, mask_dc, IL3820_SET_RAM_X_ADDRESS_COUNTER, 0);
  
  /* x point must be the multiple of 8 or the last 3 bits will be ignored */
  il3820_spiWrite(mask_cs, mask_sdi, mask_clk, mask_dc, 0, 1);
  il3820_spiWrite(mask_cs, mask_sdi, mask_clk, mask_dc, IL3820_SET_RAM_Y_ADDRESS_COUNTER, 0);
  il3820_spiWrite(mask_cs, mask_sdi, mask_clk, mask_dc, 0, 1);
  il3820_spiWrite(mask_cs, mask_sdi, mask_clk, mask_dc, 0, 1);

  while (input(dev->status_pin) == 1);                  //0: idle, 1: busy

  il3820_spiWrite(mask_cs, mask_sdi, mask_clk, mask_dc, IL3820_WRITE_RAM, 0);
  
  OUTA |= mask_dc;                                      // force data mode
  il3820_spiWriteBytes(mask_cs, mask_sdi, mask_clk, dev->image_ptr, dev->image_size);
  
  // Update display
  il3820_spiWrite(mask_cs, mask_sdi, mask_clk, mask_dc, IL3820_DISPLAY_UPDATE_2, 0);
  il3820_spiWrite(mask_cs, mask_sdi, mask_clk, mask_dc, 0xC4, 1);
  il3820_spiWrite(mask_cs, mask_sdi, mask_clk, mask_dc, IL3820_MASTER_ACTIVATION, 0);
  il3820_spiWrite(mask_cs, mask_sdi, mask_clk, mask_dc, IL3820_TERMINATE_FRAME_READ_WRITE, 0);
  
  il3820_writeLockClear(dev->dev_id);
  
  while (input(dev->status_pin) == 1);                 //0: idle, 1: busy
}