226 lines
6.8 KiB
C
226 lines
6.8 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://chibios-gfx.com/license.html
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*/
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/**
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* @file drivers/gdisp/Nokia6610GE8/gdisp_lld_board_olimexsam7ex256.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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* @addtogroup GDISP
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* @{
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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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// 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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static volatile AT91PS_PDC pPDC = AT91C_BASE_PDC_SPI0;
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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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NULL,
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{
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{PWM_MCK_DIV_1 | PWM_OUTPUT_ACTIVE_HIGH | PWM_OUTPUT_PIN1 | PWM_DISABLEPULLUP_PIN1, NULL},
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},
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};
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static bool_t pwmRunning = FALSE;
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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 inline void init_board(void) {
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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 seems to be ignored
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// pPIOA->PIO_SODR = 1<<12; // Set PA2 to HIGH
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// pPIOA->PIO_OER = 1<<12; // Configure PA2 as output
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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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pPIOA->PIO_BSR = 0;
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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, Sowtware reset
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pSPI->SPI_CR = 0x01; //SPI Enable
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//pSPI->SPI_MR = 0xE0019; //Master mode, fixed select, disable decoder, FDIV=1 (MCK), PCS=1110
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pSPI->SPI_MR = 0xE0011; //Master mode, fixed select, disable decoder, FDIV=0 (MCK), PCS=1110
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//pSPI->SPI_CSR[0] = 0x01010C11; //9bit, CPOL=1, ClockPhase=0, SCLK = 48Mhz/32*12 = 125kHz
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pSPI->SPI_CSR[0] = 0x01010311; //9bit, CPOL=1, ClockPhase=0, SCLK = 48Mhz/8 = 6MHz if using commented MR line above
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/* Display backlight control at 100% */
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pwmRunning = FALSE;
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palSetPad(IOPORT2, PIOB_LCD_BL);
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}
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/**
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* @brief Set or clear the lcd reset pin.
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*
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* @param[in] state TRUE = lcd in reset, FALSE = normal operation
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*
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* @notapi
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*/
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static inline void setpin_reset(bool_t state) {
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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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/**
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* @brief Set the lcd back-light level.
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* @note For now 0% turns the backlight off, anything else the backlight is on.
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* While the hardware supports PWM backlight control, we are not using it
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* yet.
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*
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* @param[in] percent 0 to 100%
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*
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* @notapi
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*/
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static inline void set_backlight(uint8_t percent) {
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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 = FALSE;
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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 = FALSE;
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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 = TRUE;
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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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/**
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* @brief Take exclusive control of the bus
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*
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* @notapi
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*/
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static inline void acquire_bus(void) {
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/* Nothing to do for this board as the LCD is the only device on the SPI port */
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}
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/**
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* @brief Release exclusive control of the bus
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*
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* @notapi
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*/
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static inline void release_bus(void) {
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// Nothing to do for this board as the LCD is the only device on the SPI port
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}
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/**
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* @brief Send an 8 bit command to the lcd.
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*
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* @param[in] cmd The command to send
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*
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* @notapi
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*/
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static inline void write_cmd(uint16_t cmd) {
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// wait for the previous transfer to complete
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while((pSPI->SPI_SR & AT91C_SPI_TXEMPTY) == 0);
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// send the command
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pSPI->SPI_TDR = cmd & 0xFF;
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}
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/**
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* @brief Send an 8 bit data to the lcd.
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*
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* @param[in] data The data to send
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*
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* @notapi
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*/
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static inline void write_data(uint16_t data) {
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// wait for the previous transfer to complete
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while((pSPI->SPI_SR & AT91C_SPI_TXEMPTY) == 0);
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// send the data
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pSPI->SPI_TDR = data | 0x0100;
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}
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#if GDISP_HARDWARE_READPIXEL || GDISP_HARDWARE_SCROLL || defined(__DOXYGEN__)
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/**
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* @brief Read data from the lcd.
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*
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* @return The data from the lcd
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*
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* @notapi
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*/
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static inline uint16_t read_data(void) {
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#error "gdispNokia6610GE8: GDISP_HARDWARE_READPIXEL and GDISP_HARDWARE_SCROLL are not supported on this board"
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return 0;
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}
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#endif
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#endif /* _GDISP_LLD_BOARD_H */
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/** @} */
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