LPC11Uxx.c

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/*
        Copyright (c) 2012, Andy Gock

        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.
                * Neither the name of Andy Gock nor the
                  names of its contributors may be used to endorse or promote products
                  derived from this software without specific prior written permission.

        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 ANDY GOCK 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.
*/

#include "../glcd.h"
#include "LPC11Uxx.h"

#if defined(GLCD_DEVICE_LPC11UXX)

void glcd_init(void)
{

#if defined(GLCD_CONTROLLER_PCD8544)
        /*
         * Set up SPI (SSP)
         * Note: Max allowed SPI clock is 4 MHz from datasheet.
         */

        /* Select SSP/SPI port */
        SSP_IOConfig( CONTROLLER_SPI_PORT_NUMBER );

        /* Initialise SSP/SPI port */
        SSP_Init( CONTROLLER_SPI_PORT_NUMBER );

        /* Above functions take care of SPI pins */

        /* Set SS, DC and RST pins to output */
        CONTROLLER_SS_PORT->DIR  |= (1 << CONTROLLER_SS_PIN);
        CONTROLLER_DC_PORT->DIR  |= (1 << CONTROLLER_DC_PIN);
        CONTROLLER_RST_PORT->DIR |= (1 << CONTROLLER_RST_PIN);

        /* Deselect LCD */
        GLCD_DESELECT();

        /* Reset the display */
        glcd_reset();

        /* Get into the EXTENDED mode! */
        glcd_command(PCD8544_FUNCTION_SET | PCD8544_EXTENDED_INSTRUCTION);

        /* LCD bias select (4 is optimal?) */
        glcd_command(PCD8544_SET_BIAS | 0x2);

        /* Set VOP */
        glcd_command(PCD8544_SET_VOP | 50); // Experimentally determined

        /* Back to standard instructions */
        glcd_command(PCD8544_FUNCTION_SET);

        /* Normal mode */
        glcd_command(PCD8544_DISPLAY_CONTROL | PCD8544_DISPLAY_NORMAL);

        glcd_select_screen(glcd_buffer,&glcd_bbox);

        glcd_clear();

#elif defined(GLCD_CONTROLLER_NT75451)
        /* Parallel interface controller used on NGX BlueBoards */
        
        /* Set 4x control lines pins as output */
        LPC_GPIO->DIR[CONTROLLER_LCD_EN_PORT] |= (1U<<CONTROLLER_LCD_EN_PIN);
        LPC_GPIO->DIR[CONTROLLER_LCD_RW_PORT] |= (1U<<CONTROLLER_LCD_RW_PIN);
        LPC_GPIO->DIR[CONTROLLER_LCD_RS_PORT] |= (1U<<CONTROLLER_LCD_RS_PIN);
        LPC_GPIO->DIR[CONTROLLER_LCD_CS_PORT] |= (1U<<CONTROLLER_LCD_CS_PIN);
        
        /* Don't worry about setting default RS/RW/CS/EN, they get set during use */
        
#ifdef CONTROLLER_LCD_DATA_PORT 
        /* Set data pins as output */
        LPC_GPIO->DIR[CONTROLLER_LCD_D0_PORT] |= GLCD_PARALLEL_MASK;
#else
        #error "Support of parallel data pins on different ports not supported."
#endif

        /* Initialise sequence - code by NGX Technologies */
        glcd_command(0xE2);  /* S/W RESWT               */
        glcd_command(0xA0);  /* ADC select              */
        glcd_command(0xC8);  /* SHL Normal              */
        glcd_command(0xA3);  /* LCD bias                */
        glcd_command(0x2F);  /* Power control           */
        glcd_command(0x22);  /* reg resistor select     */
        glcd_command(0x40);  /* Initial display line 40 */
        glcd_command(0xA4);  /* Normal display          */
        glcd_command(0xA6);  /* Reverce display a7      */
        glcd_command(0x81);  /* Ref vg select mode      */
        glcd_command(0x3f);  /* Ref vg reg select       */
        glcd_command(0xB0);  /* Set page address        */
        glcd_command(0x10);  /* Set coloumn addr MSB    */
        glcd_command(0x00);  /* Set coloumn addr LSB    */
        glcd_command(0xAF);  /* Display ON              */

        /* Select default screen buffer */
        glcd_select_screen(glcd_buffer,&glcd_bbox);

        /* Clear the screen buffer */
        glcd_clear();
        
#else /* GLCD_CONTROLLER_PCD8544 */
        #error "Controller not supported by LPC111x"
#endif

}

#if defined(GLCD_USE_PARALLEL)

void glcd_parallel_write(uint8_t c)
{
        
        uint32_t port_output = \
                ( ( (1U << 0) & c ? 1 : 0 ) << CONTROLLER_LCD_D0_PIN ) | \
                ( ( (1U << 1) & c ? 1 : 0 ) << CONTROLLER_LCD_D1_PIN ) | \
                ( ( (1U << 2) & c ? 1 : 0 ) << CONTROLLER_LCD_D2_PIN ) | \
                ( ( (1U << 3) & c ? 1 : 0 ) << CONTROLLER_LCD_D3_PIN ) | \
                ( ( (1U << 4) & c ? 1 : 0 ) << CONTROLLER_LCD_D4_PIN ) | \
                ( ( (1U << 5) & c ? 1 : 0 ) << CONTROLLER_LCD_D5_PIN ) | \
                ( ( (1U << 6) & c ? 1 : 0 ) << CONTROLLER_LCD_D6_PIN ) | \
                ( ( (1U << 7) & c ? 1 : 0 ) << CONTROLLER_LCD_D7_PIN );

        /* Perform the write */

        /* Clear data bits to zero and set required bits as needed */
        LPC_GPIO->CLR[CONTROLLER_LCD_D0_PORT] |= GLCD_PARALLEL_MASK;
        LPC_GPIO->SET[CONTROLLER_LCD_D0_PORT] |= port_output;
        
        GLCD_RW_LOW();
        GLCD_CS_LOW();
        GLCD_EN_HIGH();
        
        /* Must hold for minimum 80 ns = ~12.5 MHz pulse */
        
        /* Do whatever is needed for your MCU */
        //glcd_delay(1);
        
        GLCD_EN_LOW();
        GLCD_CS_HIGH();
        GLCD_RW_HIGH();
        
}

#else

void glcd_spi_write(uint8_t c)
{
        GLCD_SELECT();
        SSP_Send(CONTROLLER_SPI_PORT_NUMBER,&c,1);
        GLCD_DESELECT();
}

#endif /* GLCD_USE_PARALLEL */

void glcd_reset(void)
{
#if defined(GLCD_CONTROLLER_PCD8544)
        /* Toggle RST low to reset. Minimum pulse 100ns on datasheet. */
        GLCD_SELECT();
        GLCD_RESET_LOW();
        delay_ms(GLCD_RESET_TIME);
        GLCD_RESET_HIGH();
        GLCD_DESELECT();
        
#elif defined(GLCD_CONTROLLER_NT75451)
        /* No physical reset possible with our test board (BlueBoard) */
        
#endif /* GLCD_CONTROLLER_PCD8544 */    
}

void glcd_delay(uint32_t count)
{
  uint16_t j=0,i=0;

  for(j=0;j<count;j++)
  {
    /* At 60Mhz, the below loop introduces
    delay of 10 us */
    for(i=0;i<35;i++);
  }
}

#endif /* GLCD_DEVICE_LPC11UXX */