ltv350qv.c File Reference

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Detailed Description

Power on and power down sequence for the LTV350QV display on the STK1000.

• Compiler: GNU GCC for AVR32
• Supported devices: All AVR32AP devices with a SIDSA LCD controller

Author:

Atmel Corporation: http://www.atmel.com
Support and FAQ: http://support.atmel.no/

$Name$

Revision

595

$RCSfile$

Date

2007-08-24 10:13:07 +0200 (Fri, 24 Aug 2007)

Definition in file ltv350qv.c.

#include "spi.h"
#include "pm.h"
#include <stdio.h>
#include <sys/sysregs.h>

Include dependency graph for ltv350qv.c:

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Defines
#define	sysreg_read(addr)   __builtin_mfsr(addr)
#define	sysreg_write(addr, value)   __builtin_mtsr(addr, value)
#define	write_reg(spi, reg, val)
Functions
static unsigned int	get_count (void)
void	ltv350qv_power_off (volatile avr32_spi_t *spi, unsigned char chip_select)
	Power off sequence for the dispaly.
void	ltv350qv_power_on (volatile avr32_spi_t *spi, unsigned char chip_select)
	Power on sequence for the display.
static int	ltv350qv_write_reg (volatile avr32_spi_t *spi, unsigned char reg, unsigned short val)
	Write to a display register.
void	usart_print (volatile struct avr32_usart_t *usart, char *str)
void	usdelay (unsigned long usec)
	Delay execution for a specificated time.
Variables
struct avr32_usart_t *	usart
	USART used for console output.

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Define Documentation

#define sysreg_read

(

addr

)

__builtin_mfsr(addr)

Definition at line 52 of file ltv350qv.c.

Referenced by get_count().

#define sysreg_write	(	addr,
		value		)	__builtin_mtsr(addr, value)

Definition at line 53 of file ltv350qv.c.

#define write_reg	(	spi,
		reg,
		val		)

Value:

do {                                            \
                ret = ltv350qv_write_reg(spi, reg, val);        \
                if (ret){                               \
                        usart_print(usart, "Error spi timeout\n");\
                        goto out;                       \
                }\
        } while (0)

Definition at line 56 of file ltv350qv.c.

Referenced by ltv350qv_power_off(), and ltv350qv_power_on().

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Function Documentation

static unsigned int get_count

(

void

)

[inline, static]

Definition at line 68 of file ltv350qv.c.

References sysreg_read.

Referenced by usdelay().

{
        return sysreg_read(SYSREG_COUNT);
}

void ltv350qv_power_off	(	volatile avr32_spi_t *	spi,
		unsigned char	chip_select
	)

Power off sequence for the dispaly.

Parameters:

	spi	Pointer to the SPI interface
	chip_select	Chip select number

Definition at line 172 of file ltv350qv.c.

References spi_selectChip(), usart, usart_print(), usdelay(), and write_reg.

{
        int ret;
        spi_selectChip(spi, chip_select);
        usart_print(usart,"ltv350qv: do power off sequence\n");
        /* GON -> 0, POC -> 0 */
        write_reg(spi, 9, 0x4055);
        /* DSC -> 0 */
        write_reg(spi, 5, 0x4003);
        /* VCOMG -> 0 */
        write_reg(spi, 10, 0x2103);

        usdelay(1000000);

        /* AP[2:0] -> 000 */
        write_reg(spi, 9, 0x4050);

        usart_print(usart,"ltv350qv: power off sequence done\n");
out:
        return;
}

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void ltv350qv_power_on	(	volatile avr32_spi_t *	spi,
		unsigned char	chip_select
	)

Power on sequence for the display.

Parameters:

	spi	Pointer to the SPI interface
	chip_select	Chip select number

Definition at line 127 of file ltv350qv.c.

References spi_selectChip(), usart, usart_print(), usdelay(), and write_reg.

Referenced by main().

{
        int ret;

        usart_print(usart,"ltv350qv: do power on sequence\n");
        spi_selectChip(spi, chip_select);
        /* write startup procedure */
        write_reg(spi, 9, 0x0000);
        usdelay(15000);
        write_reg(spi, 9, 0x4000);
        write_reg(spi, 10, 0x2000);
        write_reg(spi, 9, 0x4055);
        usdelay(55000);
        write_reg(spi, 1, 0x409d);
        write_reg(spi, 2, 0x0204);
        write_reg(spi, 3, 0x0100);
        write_reg(spi, 4, 0x3000);
        write_reg(spi, 5, 0x4003);
        write_reg(spi, 6, 0x000a);
        write_reg(spi, 7, 0x0021);
        write_reg(spi, 8, 0x0c00);
        write_reg(spi, 10, 0x0103);
        write_reg(spi, 11, 0x0301);
        write_reg(spi, 12, 0x1f0f);
        write_reg(spi, 13, 0x1f0f);
        write_reg(spi, 14, 0x0707);
        write_reg(spi, 15, 0x0307);
        write_reg(spi, 16, 0x0707);
        write_reg(spi, 17, 0x0000);
        write_reg(spi, 18, 0x0004);
        write_reg(spi, 19, 0x0000);

        usdelay(20000);
        write_reg(spi, 9, 0x4a55);
        write_reg(spi, 5, 0x5003);

        usart_print(usart,"ltv350qv: power on sequence done\n");
out:
        return;
}

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static int ltv350qv_write_reg	(	volatile avr32_spi_t *	spi,
		unsigned char	reg,
		unsigned short	val
	)			[static]

Write to a display register.

Parameters:

	spi	Pointer to the SPI interface
	reg	Register
	val	Register value

Definition at line 97 of file ltv350qv.c.

References SPI_OK, and spi_variableSlaveWrite().

{
        int i;
        unsigned char buffer[3];

        buffer[0] = 0x74;
        buffer[1] = 0x00;
        buffer[2] = reg & 0x7f;
        
        for( i = 0; i <= 2; i++){
                if( spi_variableSlaveWrite(spi, buffer[i], 1, (i == 2 ? 1 : 0)) != SPI_OK)
                        return -1;
        }

        buffer[0] = 0x76;
        buffer[1] = val >> 8;
        buffer[2] = val;
        
        for( i = 0; i <= 2; i++){
                if( spi_variableSlaveWrite(spi, buffer[i], 1, (i == 2 ? 1 : 0)) != SPI_OK)
                        return -1;
        }
        return 0;
}

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void usart_print	(	volatile struct avr32_usart_t *	usart,
		char *	str
	)

Definition at line 29 of file at32stk1000.c.

References usart_putchar().

Referenced by board_init(), ltv350qv_power_off(), ltv350qv_power_on(), main(), and usart_printHex().

{
        while (*str != '\0')
                usart_putchar(usart, *str++);
}

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void usdelay

(

unsigned long

usec

)

Delay execution for a specificated time.

Parameters:

usec

Delay in microseconds

Definition at line 77 of file ltv350qv.c.

References get_count(), and pm_read_mclk().

Referenced by ltv350qv_power_off(), ltv350qv_power_on(), and main().

{
        unsigned long start, stop;
        unsigned long ticks;

        start = get_count();
        ticks = usec * (pm_read_mclk() / 1000000);
        stop = start + ticks;

        if (start > stop)
                while (get_count() > start) ;
        
        while (get_count() < stop) ;
}

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Variable Documentation

struct avr32_usart_t* usart

USART used for console output.

Definition at line 130 of file lcdc_moving_bitmap_example.c.

Referenced by board_init(), init_uart_a(), ltv350qv_power_off(), ltv350qv_power_on(), and main().

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