Add PWM backlight control to Nokia6610GE8
Add PWM backlight control to Nokia6610GE8 for the Olimex SAM7EX256 board.
This commit is contained in:
Andrew Hannam
parent
911df31d1c
commit
2d7c95d20a
@ -1,196 +1,238 @@
|
||||
/*
|
||||
ChibiOS/GFX - Copyright (C) 2012
|
||||
Joel Bodenmann aka Tectu <joel@unormal.org>
|
||||
|
||||
This file is part of ChibiOS/GFX.
|
||||
|
||||
ChibiOS/GFX is free software; you can redistribute it and/or modify
|
||||
it under the terms of the GNU General Public License as published by
|
||||
the Free Software Foundation; either version 3 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
ChibiOS/GFX is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
/**
|
||||
* @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
|
||||
// ******************************************************
|
||||
volatile AT91PS_PIO pPIOA = AT91C_BASE_PIOA;
|
||||
volatile AT91PS_PIO pPIOB = AT91C_BASE_PIOB;
|
||||
volatile AT91PS_SPI pSPI = AT91C_BASE_SPI0;
|
||||
volatile AT91PS_PMC pPMC = AT91C_BASE_PMC;
|
||||
volatile AT91PS_PDC pPDC = AT91C_BASE_PDC_SPI0;
|
||||
|
||||
/**
|
||||
* @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
|
||||
}
|
||||
|
||||
/**
|
||||
* @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)
|
||||
palSetPad(IOPORT2, PIOB_LCD_BL);
|
||||
else
|
||||
palClearPad(IOPORT2, PIOB_LCD_BL);
|
||||
}
|
||||
|
||||
/**
|
||||
* @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 */
|
||||
/** @} */
|
||||
/*
|
||||
ChibiOS/GFX - Copyright (C) 2012
|
||||
Joel Bodenmann aka Tectu <joel@unormal.org>
|
||||
|
||||
This file is part of ChibiOS/GFX.
|
||||
|
||||
ChibiOS/GFX is free software; you can redistribute it and/or modify
|
||||
it under the terms of the GNU General Public License as published by
|
||||
the Free Software Foundation; either version 3 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
ChibiOS/GFX is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
/**
|
||||
* @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 */
|
||||
/** @} */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user