193 lines
6.6 KiB
C
193 lines
6.6 KiB
C
/*
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* This file is subject to the terms of the GFX License. If a copy of
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* the license was not distributed with this file, you can obtain one at:
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*
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* http://ugfx.io/license.html
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*/
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/**
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* @file boards/base/Olimex-SAM7EX256-GE8/board_Nokia6610GE8.h
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* @brief GDISP Graphic Driver subsystem board interface for the Olimex SAM7-EX256 board.
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*/
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#ifndef _GDISP_LLD_BOARD_H
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#define _GDISP_LLD_BOARD_H
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/*
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* Set various display properties. These properties mostly depend on the exact controller chip you get.
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* The defaults should work for most controllers.
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*/
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//#define GDISP_GE8_BROKEN_CONTROLLER GFXOFF // Uncomment this out if you have a controller thats not window wrap broken.
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//#define GDISP_SCREEN_HEIGHT 130 // The visible display height
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//#define GDISP_SCREEN_WIDTH 130 // The visible display width
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//#define GDISP_RAM_X_OFFSET 0 // The x offset of the visible area
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//#define GDISP_RAM_Y_OFFSET 2 // The y offset of the visible area
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//#define GDISP_SLEEP_SIZE 32 // The size of the sleep mode partial display
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//#define GDISP_SLEEP_POS 50 // The position of the sleep mode partial display
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//#define GDISP_INITIAL_CONTRAST 38 // The initial contrast percentage
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//#define GDISP_INITIAL_BACKLIGHT 100 // The initial backlight percentage
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// For a multiple display configuration we would put all this in a structure and then
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// set g->board to that structure.
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// ******************************************************
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// Pointers to AT91SAM7X256 peripheral data structures
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// ******************************************************
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static volatile AT91PS_PIO pPIOA = AT91C_BASE_PIOA;
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static volatile AT91PS_PIO pPIOB = AT91C_BASE_PIOB;
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static volatile AT91PS_SPI pSPI = AT91C_BASE_SPI0;
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static volatile AT91PS_PMC pPMC = AT91C_BASE_PMC;
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/* The PWM backlight control is non-linear on this board.
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* We pick values here that make it look a bit more linear.
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*/
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#define PWM_TOP_VALUE 500
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#define PWM_BOTTOM_VALUE 200
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#define PWM_VALUE(x) (PWM_BOTTOM_VALUE+(PWM_TOP_VALUE-PWM_BOTTOM_VALUE)*(x)/100)
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/* PWM configuration structure. The LCD Backlight is on PWM1/PB20 ie PWM2/PIN1 in ChibiOS speak */
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static const PWMConfig pwmcfg = {
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1000000, /* 1 MHz PWM clock frequency. Ignored as we are using PWM_MCK_DIV_n */
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1000, /* PWM period is 1000 cycles. */
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0,
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{
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{PWM_MCK_DIV_1 | PWM_OUTPUT_ACTIVE_HIGH | PWM_OUTPUT_PIN1 | PWM_DISABLEPULLUP_PIN1, 0},
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},
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};
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static gBool pwmRunning = gFalse;
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/**
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* @brief Initialise the board for the display.
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* @notes Performs the following functions:
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* 1. initialise the spi port used by your display
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* 2. initialise the reset pin (initial state not-in-reset)
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* 3. initialise the chip select pin (initial state not-active)
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* 4. initialise the backlight pin (initial state back-light off)
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*
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* @notapi
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*/
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static GFXINLINE void init_board(GDisplay *g) {
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// As we are not using multiple displays we set g->board to NULL as we don't use it.
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g->board = 0;
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switch(g->controllerdisplay) {
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case 0: // Set up for Display 0
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// *********************************************************************************************
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// InitSpi( )
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//
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// Sets up SPI channel 0 for communications to Nokia 6610 LCD Display
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//
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// I/O ports used: PA2 = LCD Reset (set to low to reset)
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// PA12 = LCD chip select (set to low to select the LCD chip)
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// PA16 = SPI0_MISO Master In - Slave Out (not used in LCD interface)
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// PA17 = SPI0_MOSI Master Out - Slave In pin (Serial Data to LCD slave)
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// PA18 = SPI0_SPCK Serial Clock (to LCD slave)
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// PB20 = backlight control (normally PWM control, 1 = full on)
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//
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// *********************************************************************************************}
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/* This code should really use the ChibiOS driver for these functions */
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// Pin for backlight
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pPIOB->PIO_CODR = PIOB_LCD_BL_MASK; // Set PB20 to LOW
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pPIOB->PIO_OER = PIOB_LCD_BL_MASK; // Configure PB20 as output
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// Reset pin
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pPIOA->PIO_SODR = PIOA_LCD_RESET_MASK; // Set PA2 to HIGH
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pPIOA->PIO_OER = PIOA_LCD_RESET_MASK; // Configure PA2 as output
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// CS pin - this is driven automatically by the SPI hardware itself
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// Init SPI0
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// Disable the following pins from PIO control (will be used instead by the SPI0 peripheral)
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// BIT12 = PA12 -> SPI0_NPCS0 chip select
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// BIT16 = PA16 -> SPI0_MISO Master In - Slave Out (not used in LCD interface)
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// BIT17 = PA17 -> SPI0_MOSI Master Out - Slave In pin (Serial Data to LCD slave)
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// BIT18 = PA18 -> SPI0_SPCK Serial Clock (to LCD slave)
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pPIOA->PIO_PDR = (1<<12) | (1<<16) | (1<<17) | (1<<18);
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pPIOA->PIO_ASR = (1<<12) | (1<<16) | (1<<17) | (1<<18);
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//enable the clock of SPI
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pPMC->PMC_PCER = 1 << AT91C_ID_SPI0;
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// Fixed mode
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pSPI->SPI_CR = 0x81; //SPI Enable, Software reset
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pSPI->SPI_CR = 0x81; //SPI Enable, Software reset - 2nd write as per errata
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pSPI->SPI_CR = 0x01; //SPI Enable
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pSPI->SPI_MR = 0x000E0011; //Master mode, fixed select, disable decoder, PCS=1110
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pSPI->SPI_CSR[0] = 0x00000311; //9bit, CPOL=1, ClockPhase=0, SCLK = 48Mhz/3 = 16MHz
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/* Display backlight control at 100% */
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pwmRunning = gFalse;
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palSetPad(IOPORT2, PIOB_LCD_BL);
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break;
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}
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}
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static GFXINLINE void post_init_board(GDisplay *g) {
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(void) g;
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}
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static GFXINLINE void setpin_reset(GDisplay *g, gBool state) {
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(void) g;
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if (state)
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palClearPad(IOPORT1, PIOA_LCD_RESET);
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else
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palSetPad(IOPORT1, PIOA_LCD_RESET);
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}
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static GFXINLINE void set_backlight(GDisplay *g, uint8_t percent) {
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(void) g;
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if (percent == 100) {
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/* Turn the pin on - No PWM */
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if (pwmRunning) {
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pwmStop(&PWMD2);
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pwmRunning = gFalse;
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}
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palSetPad(IOPORT2, PIOB_LCD_BL);
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} else if (percent == 0) {
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/* Turn the pin off - No PWM */
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if (pwmRunning) {
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pwmStop(&PWMD2);
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pwmRunning = gFalse;
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}
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palClearPad(IOPORT2, PIOB_LCD_BL);
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} else {
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/* Use the PWM */
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if (!pwmRunning) {
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pwmStart(&PWMD2, &pwmcfg);
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pwmRunning = gTrue;
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}
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pwmEnableChannel(&PWMD2, 0, PWM_VALUE(percent));
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}
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}
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static GFXINLINE void acquire_bus(GDisplay *g) {
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(void) g;
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}
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static GFXINLINE void release_bus(GDisplay *g) {
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(void) g;
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}
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static GFXINLINE void write_index(GDisplay *g, uint16_t index) {
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(void) g;
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// wait for the previous transfer to start
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while(!(pSPI->SPI_SR & AT91C_SPI_TDRE));
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// send the command
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pSPI->SPI_TDR = index & 0xFF;
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}
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static GFXINLINE void write_data(GDisplay *g, uint16_t data) {
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(void) g;
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// wait for the previous transfer to start
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while(!(pSPI->SPI_SR & AT91C_SPI_TDRE));
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// send the data
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pSPI->SPI_TDR = data | 0x0100;
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}
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#endif /* _GDISP_LLD_BOARD_H */
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