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/*
* This file is subject to the terms of the GFX License, v1.0. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://chibios-gfx.com/license.html
*/
/**
* @file drivers/gdisp/Nokia6610GE8/gdisp_lld_board_olimexsam7ex256.h
* @brief GDISP Graphic Driver subsystem board interface for the Olimex SAM7-EX256 board.
*
* @addtogroup GDISP
* @{
*/
#ifndef _GDISP_LLD_BOARD_H
#define _GDISP_LLD_BOARD_H
// ******************************************************
// Pointers to AT91SAM7X256 peripheral data structures
// ******************************************************
static volatile AT91PS_PIO pPIOA = AT91C_BASE_PIOA;
static volatile AT91PS_PIO pPIOB = AT91C_BASE_PIOB;
static volatile AT91PS_SPI pSPI = AT91C_BASE_SPI0;
static volatile AT91PS_PMC pPMC = AT91C_BASE_PMC;
static volatile AT91PS_PDC pPDC = AT91C_BASE_PDC_SPI0;
/* The PWM backlight control is non-linear on this board.
* We pick values here that make it look a bit more linear.
*/
#define PWM_TOP_VALUE 500
#define PWM_BOTTOM_VALUE 200
#define PWM_VALUE(x) (PWM_BOTTOM_VALUE+(PWM_TOP_VALUE-PWM_BOTTOM_VALUE)*(x)/100)
/* PWM configuration structure. The LCD Backlight is on PWM1/PB20 ie PWM2/PIN1 in ChibiOS speak */
static const PWMConfig pwmcfg = {
1000000, /* 1 MHz PWM clock frequency. Ignored as we are using PWM_MCK_DIV_n */
1000, /* PWM period is 1000 cycles. */
NULL,
{
{PWM_MCK_DIV_1 | PWM_OUTPUT_ACTIVE_HIGH | PWM_OUTPUT_PIN1 | PWM_DISABLEPULLUP_PIN1, NULL},
},
};
static bool_t pwmRunning = FALSE;
/**
* @brief Initialise the board for the display.
* @notes Performs the following functions:
* 1. initialise the spi port used by your display
* 2. initialise the reset pin (initial state not-in-reset)
* 3. initialise the chip select pin (initial state not-active)
* 4. initialise the backlight pin (initial state back-light off)
*
* @notapi
*/
static inline void init_board(void) {
// *********************************************************************************************
// InitSpi( )
//
// Sets up SPI channel 0 for communications to Nokia 6610 LCD Display
//
// I/O ports used: PA2 = LCD Reset (set to low to reset)
// PA12 = LCD chip select (set to low to select the LCD chip)
// PA16 = SPI0_MISO Master In - Slave Out (not used in LCD interface)
// PA17 = SPI0_MOSI Master Out - Slave In pin (Serial Data to LCD slave)
// PA18 = SPI0_SPCK Serial Clock (to LCD slave)
// PB20 = backlight control (normally PWM control, 1 = full on)
//
// *********************************************************************************************}
/* This code should really use the ChibiOS driver for these functions */
// Pin for backlight
pPIOB->PIO_CODR = PIOB_LCD_BL_MASK; // Set PB20 to LOW
pPIOB->PIO_OER = PIOB_LCD_BL_MASK; // Configure PB20 as output
// Reset pin
pPIOA->PIO_SODR = PIOA_LCD_RESET_MASK; // Set PA2 to HIGH
pPIOA->PIO_OER = PIOA_LCD_RESET_MASK; // Configure PA2 as output
// CS pin - this seems to be ignored
// pPIOA->PIO_SODR = 1<<12; // Set PA2 to HIGH
// pPIOA->PIO_OER = 1<<12; // Configure PA2 as output
// Init SPI0
// Disable the following pins from PIO control (will be used instead by the SPI0 peripheral)
// BIT12 = PA12 -> SPI0_NPCS0 chip select
// BIT16 = PA16 -> SPI0_MISO Master In - Slave Out (not used in LCD interface)
// BIT17 = PA17 -> SPI0_MOSI Master Out - Slave In pin (Serial Data to LCD slave)
// BIT18 = PA18 -> SPI0_SPCK Serial Clock (to LCD slave)
pPIOA->PIO_PDR = (1<<12) | (1<<16) | (1<<17) | (1<<18);
pPIOA->PIO_ASR = (1<<12) | (1<<16) | (1<<17) | (1<<18);
pPIOA->PIO_BSR = 0;
//enable the clock of SPI
pPMC->PMC_PCER = 1 << AT91C_ID_SPI0;
// Fixed mode
pSPI->SPI_CR = 0x81; //SPI Enable, Sowtware reset
pSPI->SPI_CR = 0x01; //SPI Enable
//pSPI->SPI_MR = 0xE0019; //Master mode, fixed select, disable decoder, FDIV=1 (MCK), PCS=1110
pSPI->SPI_MR = 0xE0011; //Master mode, fixed select, disable decoder, FDIV=0 (MCK), PCS=1110
//pSPI->SPI_CSR[0] = 0x01010C11; //9bit, CPOL=1, ClockPhase=0, SCLK = 48Mhz/32*12 = 125kHz
pSPI->SPI_CSR[0] = 0x01010311; //9bit, CPOL=1, ClockPhase=0, SCLK = 48Mhz/8 = 6MHz if using commented MR line above
/* Display backlight control at 100% */
pwmRunning = FALSE;
palSetPad(IOPORT2, PIOB_LCD_BL);
}
/**
* @brief Set or clear the lcd reset pin.
*
* @param[in] state TRUE = lcd in reset, FALSE = normal operation
*
* @notapi
*/
static inline void setpin_reset(bool_t state) {
if (state)
palClearPad(IOPORT1, PIOA_LCD_RESET);
else
palSetPad(IOPORT1, PIOA_LCD_RESET);
}
/**
* @brief Set the lcd back-light level.
* @note For now 0% turns the backlight off, anything else the backlight is on.
* While the hardware supports PWM backlight control, we are not using it
* yet.
*
* @param[in] percent 0 to 100%
*
* @notapi
*/
static inline void set_backlight(uint8_t percent) {
if (percent == 100) {
/* Turn the pin on - No PWM */
if (pwmRunning) {
pwmStop(&PWMD2);
pwmRunning = FALSE;
}
palSetPad(IOPORT2, PIOB_LCD_BL);
} else if (percent == 0) {
/* Turn the pin off - No PWM */
if (pwmRunning) {
pwmStop(&PWMD2);
pwmRunning = FALSE;
}
palClearPad(IOPORT2, PIOB_LCD_BL);
} else {
/* Use the PWM */
if (!pwmRunning) {
pwmStart(&PWMD2, &pwmcfg);
pwmRunning = TRUE;
}
pwmEnableChannel(&PWMD2, 0, PWM_VALUE(percent));
}
}
/**
* @brief Take exclusive control of the bus
*
* @notapi
*/
static inline void acquire_bus(void) {
/* Nothing to do for this board as the LCD is the only device on the SPI port */
}
/**
* @brief Release exclusive control of the bus
*
* @notapi
*/
static inline void release_bus(void) {
// Nothing to do for this board as the LCD is the only device on the SPI port
}
/**
* @brief Send an 8 bit command to the lcd.
*
* @param[in] cmd The command to send
*
* @notapi
*/
static inline void write_cmd(uint16_t cmd) {
// wait for the previous transfer to complete
while((pSPI->SPI_SR & AT91C_SPI_TXEMPTY) == 0);
// send the command
pSPI->SPI_TDR = cmd & 0xFF;
}
/**
* @brief Send an 8 bit data to the lcd.
*
* @param[in] data The data to send
*
* @notapi
*/
static inline void write_data(uint16_t data) {
// wait for the previous transfer to complete
while((pSPI->SPI_SR & AT91C_SPI_TXEMPTY) == 0);
// send the data
pSPI->SPI_TDR = data | 0x0100;
}
#if GDISP_HARDWARE_READPIXEL || GDISP_HARDWARE_SCROLL || defined(__DOXYGEN__)
/**
* @brief Read data from the lcd.
*
* @return The data from the lcd
*
* @notapi
*/
static inline uint16_t read_data(void) {
#error "gdispNokia6610GE8: GDISP_HARDWARE_READPIXEL and GDISP_HARDWARE_SCROLL are not supported on this board"
return 0;
}
#endif
#endif /* _GDISP_LLD_BOARD_H */
/** @} */
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