lcdc.c

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/* Copyright (c) 2007, Atmel Corporation All rights reserved.
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 * from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY ATMEL ``AS IS'' AND ANY EXPRESS OR IMPLIED
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#include "lcdc.h"

int lcdc_init(lcdc_conf_t* lcdc_conf)
{
        volatile avr32_lcdc_t *plcdc = &AVR32_LCDC;
        unsigned char valid_data_lines = 0;
        unsigned char pixel_size = 0;
        unsigned char clkval = 0;
        unsigned int pixel_clock_theo = 0;
        unsigned short lineval, hozval;
        

        /* Turn off LCD Controller (core first then DMA) */
        plcdc->pwrcon &= ~(1 << AVR32_LCDC_PWRCON_PWR_OFFSET);
        plcdc->dmacon &= ~(1 << AVR32_LCDC_DMACON_DMAEN_OFFSET);
        
        /* LCDFRCFG */
        if(lcdc_conf->distype != TFT){
                switch(lcdc_conf->scanmod){
                case SINGLE_SCAN:
                        switch(lcdc_conf->ifwidth){
                        case IF_WIDTH4:
                                valid_data_lines = 4;
                                break;
                        case IF_WIDTH8:
                                valid_data_lines = 8;
                                break;
                        default:
                                return -1;
                }
                
                case DUAL_SCAN:
                        switch(lcdc_conf->ifwidth){
                        case IF_WIDTH8:
                                valid_data_lines = 4;
                                break;
                        case IF_WIDTH16:
                                valid_data_lines = 8;
                                break;
                        default:
                                return -1;
                        }
                default:
                        return -1;
                }
        }
                
        lineval = lcdc_conf->yres - 1;
        switch(lcdc_conf->distype){
        case STN_MONO:
                hozval = (lcdc_conf->xres / valid_data_lines) - 1;
                break;
        case STN_COLOR: 
                hozval = (lcdc_conf->xres * 3 / valid_data_lines) - 1;
                break;
        case TFT:
                hozval = lcdc_conf->xres - 1;
                break;
        default:
                return -1;
        }
        plcdc->lcdfrmcfg = (lineval & AVR32_LCDC_LINEVAL_MASK) |
                        ((hozval << AVR32_LCDC_HOZVAL) & AVR32_LCDC_HOZVAL_MASK);
        

        /* Calculation of theoretical pixel clock */
        switch(lcdc_conf->distype){
                case STN_MONO:
                        pixel_clock_theo = lcdc_conf->frame_rate * lcdc_conf->xres * lcdc_conf->yres / valid_data_lines;
                        break;
                case STN_COLOR:
                        pixel_clock_theo = lcdc_conf->frame_rate * lcdc_conf->xres * lcdc_conf->yres * 3 / valid_data_lines;
                        break;
                case TFT:
                        pixel_clock_theo = lcdc_conf->frame_rate * lcdc_conf->xres * lcdc_conf->yres;
                        break;
                default:
                        return -1;
        }
        clkval = (lcdc_conf->lcdcclock / (2 * pixel_clock_theo));
        if (clkval == 0) {
                plcdc->lcdcon1 = 1; /* bypass pixel clock */
        } else {
                plcdc->lcdcon1 = ((clkval - 1) << AVR32_LCDC_LCDCON1_CLKVAL) & AVR32_LCDC_LCDCON1_CLKVAL_MASK;
        }
        
        /* LCDCON2 */
        switch(lcdc_conf->pixelsize){
                case 1: pixel_size = 0;break;
                case 2: pixel_size = 1;break;
                case 4: pixel_size = 2;break;
                case 8: pixel_size = 3;break;
                case 16: pixel_size = 4;break;
                case 24: pixel_size = 5;break;
                case 32: pixel_size = 6;break;
                default:
                        return -1;
        }
        plcdc->lcdcon2 = (lcdc_conf->distype & AVR32_LCDC_LCDCON2_DISTYPE_MASK) |
                        ((lcdc_conf->scanmod << AVR32_LCDC_LCDCON2_SCANMOD) & AVR32_LCDC_LCDCON2_SCANMOD_MASK) |
                        ((lcdc_conf->ifwidth << AVR32_LCDC_LCDCON2_IFWIDTH) & AVR32_LCDC_LCDCON2_IFWIDTH_MASK) |
                        ((lcdc_conf->invvd << AVR32_LCDC_LCDCON2_INVVD) & AVR32_LCDC_LCDCON2_INVVD_MASK) |
                        ((lcdc_conf->invframe << AVR32_LCDC_LCDCON2_INVFRAME) & AVR32_LCDC_LCDCON2_INVFRAME_MASK) |
                        ((pixel_size << AVR32_LCDC_LCDCON2_PIXELSIZE) & AVR32_LCDC_LCDCON2_PIXELSIZE_MASK) |
                        ((lcdc_conf->invline << AVR32_LCDC_LCDCON2_INVLINE) & AVR32_LCDC_LCDCON2_INVLINE_MASK) |
                        ((lcdc_conf->invclk << AVR32_LCDC_LCDCON2_INVCLK) & AVR32_LCDC_LCDCON2_INVCLK_MASK) |
                        ((lcdc_conf->invdval << AVR32_LCDC_LCDCON2_INVDVAL) & AVR32_LCDC_LCDCON2_INVDVAL_MASK) |
                        ((lcdc_conf->clkmod << AVR32_LCDC_LCDCON2_CLKMOD) & AVR32_LCDC_LCDCON2_CLKMOD_MASK) |
                        ((lcdc_conf->memor << AVR32_LCDC_LCDCON2_MEMOR) & AVR32_LCDC_LCDCON2_MEMOR_MASK);

        /* Timings */
        plcdc->lcdtim1 = (lcdc_conf->vfp & AVR32_LCDC_LCDTIM1_VFP_MASK) |
                        ((lcdc_conf->vbp << AVR32_LCDC_LCDTIM1_VBP) & AVR32_LCDC_LCDTIM1_VBP_MASK) |
                        (((lcdc_conf->vpw - 1) << AVR32_LCDC_LCDTIM1_VPW) & AVR32_LCDC_LCDTIM1_VPW_MASK) |
                        ((lcdc_conf->vhdly << AVR32_LCDC_LCDTIM1_VHDLY) & AVR32_LCDC_LCDTIM1_VHDLY_MASK);

        plcdc->lcdtim2 = (lcdc_conf->hbp & AVR32_LCDC_HBP_MASK) |
                        (((lcdc_conf->hpw - 1) << AVR32_LCDC_LCDTIM2_HPW) & AVR32_LCDC_LCDTIM2_HPW_MASK) |
                        ((lcdc_conf->hfp << AVR32_LCDC_LCDTIM2_HFP) & AVR32_LCDC_LCDTIM2_HFP_MASK);

        /* Interrupts */
        plcdc->idr = 0xFFFFFFFF;

        /* Toggle rate */
        plcdc->lcdmval = (lcdc_conf->mval & AVR32_LCDC_LCDMVAL_MVAL_MASK) |
                        ((lcdc_conf->mmode << AVR32_LCDC_LCDMVAL_MMODE_OFFSET) & AVR32_LCDC_LCDMVAL_MMODE_MASK);
        
        /* Contrast */
        plcdc->contrast_val = lcdc_conf->ctrstval;
        plcdc->contrast_ctr = (lcdc_conf->ctrst_ps & AVR32_LCDC_CONTRAST_CTR_PS_MASK) |
                        ((lcdc_conf->ctrst_pol << AVR32_LCDC_CONTRAST_CTR_POL_OFFSET) & AVR32_LCDC_CONTRAST_CTR_POL_MASK) |
                        ((lcdc_conf->ctrst_ena << AVR32_LCDC_CONTRAST_CTR_ENA_OFFSET) & AVR32_LCDC_CONTRAST_CTR_ENA_MASK);

        /* Setup FIFO */
        int lcd_fifo_size = lcdc_conf->scanmod ? 256 : 512;
        plcdc->lcdfifo = lcd_fifo_size - (2 * lcdc_conf->burst_length + 3);
        
        /* DMA base address */
        plcdc->dmabaddr1 = lcdc_conf->dmabaddr1;
        if(lcdc_conf->scanmod == DUAL_SCAN){
                plcdc->dmabaddr2 = lcdc_conf->dmabaddr2;
        }
        /* DMA frame configuration
        * The frame size is measured in words
        */
        plcdc->dmafrmcfg = ((((lcdc_conf->xres * lcdc_conf->yres * lcdc_conf->pixelsize) + 31 )/ 32) & AVR32_LCDC_DMAFRMCFG_FRMSIZE_MASK) |
                        (((lcdc_conf->burst_length - 1) << AVR32_LCDC_DMAFRMCFG_BRSTLEN) & AVR32_LCDC_DMAFRMCFG_BRSTLEN_MASK);
        
        /* 2D configuration */
        if(lcdc_conf->set2dmode){
                /* Assumed is that the frame starts at a word boundary -> no pixel offset needed */
                plcdc->dma2dcfg = ((lcdc_conf->virtual_xres - lcdc_conf->xres) * (lcdc_conf->pixelsize / 8)) & AVR32_LCDC_DMA2DCFG_ADDRINC_MASK;
        }

        /* wait for DMA engine to become idle */
        while (plcdc->dmacon & AVR32_LCDC_DMACON_DMABUSY);

        /* and enable DMA with updated configuration */
        if(lcdc_conf->set2dmode){
                plcdc->dmacon = (1 << AVR32_LCDC_DMACON_DMAEN_OFFSET) | 
                        (1 << AVR32_LCDC_DMACON_DMAUPDT_OFFSET) | 
                        (1 << AVR32_LCDC_DMACON_DMA2DEN_OFFSET);
        }
        else{
                plcdc->dmacon = (1 << AVR32_LCDC_DMACON_DMAEN_OFFSET) | 
                        (1 << AVR32_LCDC_DMACON_DMAUPDT_OFFSET);
        }
        /* enable LCD */
        plcdc->pwrcon |= (lcdc_conf->guard_time << AVR32_LCDC_PWRCON_GUARD_TIME_OFFSET) & AVR32_LCDC_PWRCON_GUARD_TIME_MASK;
        
        /* Wait for the LCDC core to become idle and enable it */
        while (plcdc->PWRCON.busy == 1);
        plcdc->PWRCON.pwr = 1;

        return 0;
}

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