lcd.c

tft lcd 16bit rgb for at91sam9263ek

/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support 
 * ----------------------------------------------------------------------------
 * Copyright (c) 2008, Atmel Corporation
 *
 * 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 disclaimer below.
 *
 * Atmel's name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * DISCLAIMED. IN NO EVENT SHALL ATMEL 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 <board.h>

#if defined (AT91C_ID_LCDC)

//------------------------------------------------------------------------------
//         Headers
//------------------------------------------------------------------------------

#include "lcd.h"
#include <utility/assert.h>
#include <utility/trace.h>


//------------------------------------------------------------------------------
//         Exported functions
//------------------------------------------------------------------------------

//------------------------------------------------------------------------------
/// Enables the LCD controller, after waiting for the specified number of
/// frames.
/// \param frames  Number of frames before the LCD is enabled.
//------------------------------------------------------------------------------
void LCD_Enable(unsigned int frames)
{
    TRACE_DEBUG("LCD enable\n\r");
    ASSERT((frames & 0xFFFFFF80) == 0,
           "LCD_Enable: Wrong frames value.\n\r");
    if( (AT91C_BASE_LCDC->LCDC_PWRCON & AT91C_LCDC_BUSY) == AT91C_LCDC_BUSY ) {
        TRACE_DEBUG("LCD BUSY E\n\r");
    }
    AT91C_BASE_LCDC->LCDC_PWRCON = AT91C_LCDC_PWR | (frames << 1);
}

//------------------------------------------------------------------------------
/// Disables the LCD controller, after waiting for the specified number of
/// frames.
/// \param frames  Number of frames before the LCD is shut down.
//------------------------------------------------------------------------------
void LCD_Disable(unsigned int frames)
{
    TRACE_DEBUG("LCD disable\n\r");
    ASSERT((frames & 0xFFFFFF80) == 0,
           "LCD_Disable: Wrong frames value.\n\r");
    // Remove AT91C_LCDC_PWR
    AT91C_BASE_LCDC->LCDC_PWRCON = frames << 1;
    // wait LCDC Core is in idle state
    while( (AT91C_BASE_LCDC->LCDC_PWRCON & AT91C_LCDC_BUSY) == AT91C_LCDC_BUSY ) {
    }
    TRACE_DEBUG("LCD is in IDLE state\n\r");
}

//------------------------------------------------------------------------------
/// Enables the DMA of the LCD controller.
//------------------------------------------------------------------------------
void LCD_EnableDma(void)
{
    if( (AT91C_BASE_LCDC->LCDC_DMACON & AT91C_LCDC_DMABUSY) == AT91C_LCDC_DMABUSY ) {
        TRACE_DEBUG("LCD DMA BUSY E\n\r");
    }
    AT91C_BASE_LCDC->LCDC_DMACON = AT91C_LCDC_DMAEN;
}

//------------------------------------------------------------------------------
/// Disables the DMA of the LCD controller.
//------------------------------------------------------------------------------
void LCD_DisableDma(void)
{
    AT91C_BASE_LCDC->LCDC_DMACON = 0;
    // wait LCDC DMA is in idle state
    while( (AT91C_BASE_LCDC->LCDC_DMACON & AT91C_LCDC_DMABUSY) == AT91C_LCDC_DMABUSY ) {
    }
    TRACE_DEBUG("LCD DMA is in IDLE state\n\r");
}

//------------------------------------------------------------------------------
/// Enables the selected LDC interrupt sources.
/// \param sources  Interrupt sources to enable.
//------------------------------------------------------------------------------
void LCD_EnableInterrupts(unsigned int sources)
{
    AT91C_BASE_LCDC->LCDC_IER = sources;
}

//------------------------------------------------------------------------------
/// Configures the internal clock of the LCD controller given the master clock of
/// the system and the desired pixel clock in MHz.
/// \param masterClock  Master clock frequency.
/// \param pixelClock  Pixel clock frequency.
//------------------------------------------------------------------------------
void LCD_SetPixelClock(unsigned int masterClock, unsigned int pixelClock)
{
    AT91C_BASE_LCDC->LCDC_LCDCON1 = ((masterClock / 2 / pixelClock) - 2) << 12;
}

//------------------------------------------------------------------------------
/// DMA reset
//------------------------------------------------------------------------------
void LCD_DMAReset(void)
{
    // DMA Module should be reset only when disabled and in idle state
    if( AT91C_LCDC_DMABUSY == (AT91C_BASE_LCDC->LCDC_DMACON & AT91C_LCDC_DMABUSY)) {
        TRACE_ERROR("LCD BUSY so NO DMA RESET\n\r");
    }
    if( AT91C_LCDC_DMAEN == (AT91C_BASE_LCDC->LCDC_DMACON & AT91C_LCDC_DMAEN)) {
        TRACE_ERROR("DMA Enabled, so NO DMA RESET\n\r");
    }
    AT91C_BASE_LCDC->LCDC_DMACON = AT91C_LCDC_DMARST;
}

//------------------------------------------------------------------------------
/// Sets the type of display used with the LCD controller.
/// \param displayType  Type of display used.
//------------------------------------------------------------------------------
void LCD_SetDisplayType(unsigned int displayType)
{
    unsigned int value;

    ASSERT((displayType & ~AT91C_LCDC_DISTYPE) == 0,
           "LCD_SetDisplayType: Wrong display type value.\n\r");

    value = AT91C_BASE_LCDC->LCDC_LCDCON2;
    value &= ~AT91C_LCDC_DISTYPE;
    value |= displayType;
    AT91C_BASE_LCDC->LCDC_LCDCON2 = value;
}

//------------------------------------------------------------------------------
/// Sets the scan mode used by the LCD (either single scan or double-scan).
/// \param scanMode  Scan mode to use.
//------------------------------------------------------------------------------
void LCD_SetScanMode(unsigned int scanMode)
{
    unsigned int value;

    ASSERT((scanMode & ~AT91C_LCDC_SCANMOD) == 0,
           "LCD_SetScanMode: Wrong scan mode value.\n\r");

    value = AT91C_BASE_LCDC->LCDC_LCDCON2;
    value &= ~AT91C_LCDC_SCANMOD;
    value |= scanMode;
    AT91C_BASE_LCDC->LCDC_LCDCON2 = value;
}

//------------------------------------------------------------------------------
/// Sets the number of bits per pixel used by the LCD display.
/// \param bitsPerPixel  Number of bits per pixel to use.
//------------------------------------------------------------------------------
void LCD_SetBitsPerPixel(unsigned int bitsPerPixel)
{
    unsigned int value;

    ASSERT((bitsPerPixel & ~AT91C_LCDC_PIXELSIZE) == 0,
           "LCD_SetScanMode: Wrong bitsPerPixel value.\n\r");

    value = AT91C_BASE_LCDC->LCDC_LCDCON2;
    value &= ~AT91C_LCDC_PIXELSIZE;
    value |= bitsPerPixel;
    AT91C_BASE_LCDC->LCDC_LCDCON2 = value;
}

//------------------------------------------------------------------------------
/// Sets the LCDD, LCDVSYNC, LCDHSYNC, LCDDOTCLK and LCDDEN signal polarities.
/// \param lcdd  LCDD signal polarity.
/// \param lcdvsync  LCDVSYNC signal polarity.
/// \param lcdhsync  LCDHSYNC signal polarity.
/// \param lcddotclk  LCDDOTCLK signal polarity.
/// \param lcdden  LCDDEN signal polarity.
//------------------------------------------------------------------------------
void LCD_SetPolarities(
    unsigned int lcdd,
    unsigned int lcdvsync,
    unsigned int lcdhsync,
    unsigned int lcddotclk,
    unsigned int lcdden)
{
    unsigned int value;

    ASSERT((lcdd & ~AT91C_LCDC_INVVD) == 0,
           "LCD_SetPolarities: Wrong lcdd value.\n\r");
    ASSERT((lcdvsync & ~AT91C_LCDC_INVFRAME) == 0,
           "LCD_SetPolarities: Wrong lcdvsync value.\n\r");
    ASSERT((lcdhsync & ~AT91C_LCDC_INVLINE) == 0,
           "LCD_SetPolarities: Wrong lcdhsync value.\n\r");
    ASSERT((lcddotclk & ~AT91C_LCDC_INVCLK) == 0,
           "LCD_SetPolarities: Wrong lcddotclk value.\n\r");
    ASSERT((lcdden & ~AT91C_LCDC_INVDVAL) == 0,
           "LCD_SetPolarities: Wrong lcdden value.\n\r");

    value = AT91C_BASE_LCDC->LCDC_LCDCON2;
    value &= 0xFFFFE0FF;
    value |= lcdd | lcdvsync | lcdhsync | lcddotclk | lcdden;
    AT91C_BASE_LCDC->LCDC_LCDCON2 = value;
}

//------------------------------------------------------------------------------
/// Sets the LCD clock mode, i.e. always active or active only during display
/// period.
/// \param clockMode  Clock mode to use.
//------------------------------------------------------------------------------
void LCD_SetClockMode(unsigned int clockMode)
{
    unsigned int value;

    ASSERT((clockMode & ~AT91C_LCDC_CLKMOD) == 0,
           "LCD_SetScanMode: Wrong scan mode value.\n\r");