From 01f3ee254fad306d40da1dbaa47efe2909df7b35 Mon Sep 17 00:00:00 2001 From: patacongo Date: Sun, 5 Dec 2010 19:54:23 +0000 Subject: Add backlight control git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3163 42af7a65-404d-4744-a932-0658087f49c3 --- .../olimex-lpc1766stk/src/lpc1766stk_internal.h | 7 +- nuttx/configs/olimex-lpc1766stk/src/up_lcd.c | 119 +++++++++++++++++++++ 2 files changed, 123 insertions(+), 3 deletions(-) (limited to 'nuttx/configs/olimex-lpc1766stk/src') diff --git a/nuttx/configs/olimex-lpc1766stk/src/lpc1766stk_internal.h b/nuttx/configs/olimex-lpc1766stk/src/lpc1766stk_internal.h index d7244e17c..b1a461a24 100755 --- a/nuttx/configs/olimex-lpc1766stk/src/lpc1766stk_internal.h +++ b/nuttx/configs/olimex-lpc1766stk/src/lpc1766stk_internal.h @@ -165,12 +165,13 @@ * P1[23]/MCFB1/PWM1[4]/MISO0 37 MISO0 * P1[24]/MCFB2/PWM1[5]/MOSI0 38 MOSI0 * P3[25]/MAT0[0]/PWM1[2] 27 LCD_RST - * P3[26]/STCLK/MAT0[1]/PWM1[3] 26 LCD_BL + * P3[26]/STCLK/MAT0[1]/PWM1[3] 26 LCD_BL (PWM1) */ -#define LPC1766STK_LCD_CS (GPIO_OUTPUT | GPIO_VALUE_ZERO | GPIO_PORT3 | GPIO_PIN25) +#define LPC1766STK_LCD_CS (GPIO_OUTPUT | GPIO_VALUE_ZERO | GPIO_PORT1 | GPIO_PIN21) #define LPC1766STK_LCD_RST (GPIO_OUTPUT | GPIO_VALUE_ZERO | GPIO_PORT3 | GPIO_PIN25) -#define LPC1766STK_LCD_BL (GPIO_OUTPUT | GPIO_VALUE_ZERO | GPIO_PORT3 | GPIO_PIN26) +#define LPC1766STK_LCD_BL GPIO_PWM1p3_3 +#define GPIO_PWM1p3 GPIO_PWM1p3_3 /* SD/MMC GPIO PIN SIGNAL NAME * -------------------------------- ---- -------------- diff --git a/nuttx/configs/olimex-lpc1766stk/src/up_lcd.c b/nuttx/configs/olimex-lpc1766stk/src/up_lcd.c index 4f2a9123e..2fc3a4426 100755 --- a/nuttx/configs/olimex-lpc1766stk/src/up_lcd.c +++ b/nuttx/configs/olimex-lpc1766stk/src/up_lcd.c @@ -48,6 +48,7 @@ #include #include +#include "lpc17_syscon.h" #include "lpc17_internal.h" #include "lpc17stk_internal.h" @@ -57,6 +58,16 @@ * Pre-Processor Definitions ****************************************************************************/ +/* Check power setting */ + +#if !defined(CONFIG_LCD_MAXPOWER) || CONFIG_LCD_MAXPOWER != 128 +# error "CONFIG_LCD_MAXPOWER must be 128" +#endif + +/* Backlight OFF PWM setting */ + +#define NOKIA_BACKLIGHT_OFF 0x40 + /* Define the CONFIG_LCD_NOKIADBG to enable detailed debug output (stuff you * would never want to see unless you are debugging this file). * @@ -80,6 +91,84 @@ # define lcd_dumpgpio(m) #endif +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: nokia_blinitialize + * + * Description: + * Initialize PWM1 to manage the LCD backlight. + * + ****************************************************************************/ + +void nokia_blinitialize(void) +{ + uint32_t regval; + + /* Enable clocking of PWM1 */ + + regval = regreg32(LPC17_SYSCON_PCONP); + regval |= SYSCON_PCONP_PCPWM1; + putreg32(regval, LPC17_SYSCON_PCONP); + + /* Disable and reset PWM1 */ + + regval = getreg32(LPC17_PWM1_TCR); + regval &= ~(PWM_TCR_PWMEN|PWM_TCR_CNTREN); + regval |= PWM_TCR_CNTRRST; + putreg32(regval, LPC17_PWM1_TCR); + + /* Put PWM1 in timer mode */ + + regval = getreg32(LPC17_PWM1_CTCR); + regval &= ~PWM_CTCR_MODE_MASK; + regval |= PWM_CTCR_MODE_TIMER; + putreg32(regval, LPC17_PWM1_CTCR); + + /* Reset on MR0 */ + + putreg32(PWM_MCR_MR0R, LPC17_PWM1_MCR); + + /* Single edge controlled mod for PWM3 and enable output */ + + regval = getreg32(LPC17_PWM1_PCR); + regval &= ~PWM_PCR_SEL3; + regval |= PWM_PCR_ENA3; + putreg32(regval, LPC17_PWM1_PCR); + + /* Clear prescaler */ + + putreg32(0, LPC17_PWM1_PR); + + /* Set 8-bit resolution */ + + putreg32(0xff, LPC17_PWM1_MCR); + + /* Enable PWM match 1 latch */ + + regval = getreg32(LPC17_PWM1_LER); + regval |= PWM_LER_M0EN; + putreg32(regval, LPC17_PWM1_LER); + + /* Clear match register 3 */ + + putreg32(0, LPC17_PWM1_MR3); + + /* Enable PWM1 */ + + regval |= PWM_LER_M3EN; + putreg32(regval, LPC17_PWM1_LER); + + regval = getreg32(LPC17_PWM1_TCR); + regval &= ~(PWM_TCR_CNTRRST); + regval |= (PWM_TCR_PWMEN|PWM_TCR_CNTREN); + putreg32(regval, LPC17_PWM1_TCR); + + nokia_backlight(0); +} + /**************************************************************************** * Public Functions ****************************************************************************/ @@ -111,6 +200,10 @@ FAR struct lcd_dev_s *up_nxdrvinit(unsigned int devno) lpc17_gpiowrite(LPC1766STK_LCD_RST, true); up_msdelay(5); + /* Configure PWM1 to support the backlight */ + + nokia_blinitialize(); + /* Get the SSP port (configure as a Freescale SPI port) */ spi = up_spiinitialize(0); @@ -140,4 +233,30 @@ FAR struct lcd_dev_s *up_nxdrvinit(unsigned int devno) return NULL; } +/**************************************************************************** + * Name: nokia_backlight + * + * Description: + * The Nokia 6100 backlight is controlled by logic outside of the LCD + * assembly. This function must be provided by board specific logic to + * manage the backlight. This function will receive a power value (0: + * full off - CONFIG_LCD_MAXPOWER: full on) and should set the backlight + * accordingly. + * + * On the Olimex LPC1766STK, the backlight level is controlled by PWM1. + * + ****************************************************************************/ + +int nokia_backlight(unsigned int power) +{ + uint32_t regval; + + putreg32(NOKIA_BACKLIGHT_OFF + power, LPC17_PWM1_MR3); + + regval = getreg32(LPC17_PWM1_LER); + regval |= PWM_LER_M3EN; + putreg32(regval, LPC17_PWM1_LER); + return OK; +} + #endif /* CONFIG_NX_LCDDRIVER && CONFIG_LCD_NOKIA6100 && CONFIG_LPC17_SSP0 */ -- cgit v1.2.3