2008-10-22 15:27:57     LCD driver BF537

2008-10-22 15:27:57     LCD driver BF537

damien OLLIVE (UNITED STATES)

Message: 64066   

I try to writting a driver to an TFT LCD.

I have a question about the PPI_CLK, I have read in the HRM that is an external CLK

but can i creat a clock and allocate this clock to PPI_CLK inside (and if it's possible how allocate this value).

or it's an external clock and i have to create it outsine the BF537 board, i can't allocate a value to this pin.

Thanks

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2008-10-23 00:23:58     Re: LCD driver BF537

Frank Van Hooft (CANADA)

Message: 64082   

That's correct - the PPI clock is always an input. Even when you're outputting data, the PPI clock is an input. Figure 7-11 in the BF537-HRM shows an example of this.

So one way or another, you need to generate a clock and then (externally, on your circuit board) feed this clock into the PPI clock pin. If you want the BF537 to generate this clock, take a look at the timer pins. You can easily program one of those to output a divided-down version of the BF537's system clock.

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2008-10-23 10:48:25     Re: LCD driver BF537

damien OLLIVE (UNITED STATES)

Message: 64121   

thanks frank

that's to be sure i can't do that internally.

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2008-10-24 09:43:46     Re: LCD driver BF537

damien OLLIVE (UNITED STATES)

Message: 64164   

HY,

My LCD working well with an external PPICLK.

Now i want to make this CLK by a blackfin timer and take it in the P11 timer port to link it with a wirer to the PPI_CLK and the PIXEL_CLK (of the LCD).

I have configure the Timer 5 like that but that don't working

#define bfin_write_TIMER_PPICLK_CONFIG  bfin_write_TIMER5_CONFIG

#define bfin_write_TIMER_PPICLK_WIDTH  bfin_write_TIMER5_WIDTH

#define bfin_write_TIMER_PPICLK_PERIOD bfin_write_TIMER5_PERIOD

#define TIMDIS_PPICLK   TIMDIS5

#define TIMEN_PPICLK   TIMEN5

Timer config:

bfin_write_TIMER_PPICLK_CONFIG(PWM_OUT|PULSE_HI|PERIOD_CNT);

    timer_period = get_sclk() / (100);

    printk("SCLK %d\n",timer_period);

    bfin_write_TIMER_PPICLK_WIDTH(timer_period);

    bfin_write_TIMER_PPICLK_PERIOD(timer_period / 2);

    SSYNC();

Port request:

bfin_write_PORT_MUX (P_TMR5);

printk("portmux\n");

regdata = bfin_read_PORTF_FER();

regdata |= PF4; //enable PPI_CLK

bfin_write_PORTF_FER(regdata);   //TMR5 sur PF4

regdata = bfin_read_PORTFIO_DIR();

regdata |= PF4; //ppi_clock is input

bfin_write_PORTFIO_DIR(regdata);

I have this timer to make the sync of my LCD and they work

#define TIMERS {P_TMR0, P_TMR1, 0}

Timer config:

bfin_write_TIMER_DISABLE(TIMDIS_HS|TIMDIS_VS|TIMDIS_PPICLK);

SSYNC();

/* Vertical Synchro, timer 1 */

bfin_write_TIMER_VS_CONFIG(PWM_OUT|PERIOD_CNT|TIN_SEL|CLK_SEL);

bfin_write_TIMER_VS_WIDTH(500);

bfin_write_TIMER_VS_PERIOD(1668335); //59.94Hz pour une CLK à 100MHz

SSYNC();

/* Horizontal Synchro, timer 0 */

bfin_write_TIMER_HS_CONFIG(PWM_OUT|PERIOD_CNT|TIN_SEL|CLK_SEL);

bfin_write_TIMER_HS_WIDTH( 41 );

bfin_write_TIMER_HS_PERIOD(5834); //17.14kHz pour une CLK à 100MHz

SSYNC();

port request:

u16 tmr_req[] = TIMERS;

printk("portsrequest\n");

    if (peripheral_request_list(tmr_req, DRIVER_NAME)) {

        printk(KERN_ERR "Requesting Peripherals TMR faild\n");

        return -EFAULT;

    }

I don't understand what this function does, could you explain me?

I have this in portmux.h

#define P_TMR5        (P_DEFINED | P_IDENT(GPIO_PF4) | P_FUNCT(0))

#define P_TMR1        (P_DEFINED | P_IDENT(GPIO_PF8) | P_FUNCT(0))

#define P_TMR0        (P_DEFINED | P_IDENT(GPIO_PF9) | P_FUNCT(0))

Thanks

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2008-10-24 09:46:03     Re: LCD driver BF537

damien OLLIVE (UNITED STATES)

Message: 64165   

HY,

My LCD works well with an external PPICLK.

Now i want to make this CLK by a blackfin timer and take it in the P11 timer port to link it with a wire to the PPI_CLK and the PIXEL_CLK (of the LCD).

I have configured the Timer 5 like that but that don't work

#define bfin_write_TIMER_PPICLK_CONFIG  bfin_write_TIMER5_CONFIG

#define bfin_write_TIMER_PPICLK_WIDTH  bfin_write_TIMER5_WIDTH

#define bfin_write_TIMER_PPICLK_PERIOD bfin_write_TIMER5_PERIOD

#define TIMDIS_PPICLK   TIMDIS5

#define TIMEN_PPICLK   TIMEN5

Timer config:

bfin_write_TIMER_PPICLK_CONFIG(PWM_OUT|PULSE_HI|PERIOD_CNT);

    timer_period = get_sclk() / (100);

    printk("SCLK %d\n",timer_period);

    bfin_write_TIMER_PPICLK_WIDTH(timer_period);

    bfin_write_TIMER_PPICLK_PERIOD(timer_period / 2);

    SSYNC();

Port request:

bfin_write_PORT_MUX (P_TMR5);

printk("portmux\n");

regdata = bfin_read_PORTF_FER();

regdata |= PF4; //enable PPI_CLK

bfin_write_PORTF_FER(regdata);   //TMR5 sur PF4

regdata = bfin_read_PORTFIO_DIR();

regdata |= PF4; //ppi_clock is input

bfin_write_PORTFIO_DIR(regdata);

I have this timer to make the sync of my LCD and they work

#define TIMERS {P_TMR0, P_TMR1, 0}

Timer config:

bfin_write_TIMER_DISABLE(TIMDIS_HS|TIMDIS_VS|TIMDIS_PPICLK);

SSYNC();

/* Vertical Synchro, timer 1 */

bfin_write_TIMER_VS_CONFIG(PWM_OUT|PERIOD_CNT|TIN_SEL|CLK_SEL);

bfin_write_TIMER_VS_WIDTH(500);

bfin_write_TIMER_VS_PERIOD(1668335); //59.94Hz pour une CLK à 100MHz

SSYNC();

/* Horizontal Synchro, timer 0 */

bfin_write_TIMER_HS_CONFIG(PWM_OUT|PERIOD_CNT|TIN_SEL|CLK_SEL);

bfin_write_TIMER_HS_WIDTH( 41 );

bfin_write_TIMER_HS_PERIOD(5834); //17.14kHz pour une CLK à 100MHz

SSYNC();

port request:

u16 tmr_req[] = TIMERS;

printk("portsrequest\n");

    if (peripheral_request_list(tmr_req, DRIVER_NAME)) {

        printk(KERN_ERR "Requesting Peripherals TMR faild\n");

        return -EFAULT;

    }

I don't understand what this function does, could you explain me?

I have this in portmux.h

#define P_TMR5        (P_DEFINED | P_IDENT(GPIO_PF4) | P_FUNCT(0))

#define P_TMR1        (P_DEFINED | P_IDENT(GPIO_PF8) | P_FUNCT(0))

#define P_TMR0        (P_DEFINED | P_IDENT(GPIO_PF9) | P_FUNCT(0))

Thanks

---

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2008-10-24 12:26:28     Re: LCD driver BF537

damien OLLIVE (UNITED STATES)

Message: 64171   

i have use the function peripheral_request_list(tmr_req, DRIVER_NAME) for the PPICLK and that works fine

but Where can i find documentation about this function i want to know what that do please

thank you

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2008-10-24 12:37:51     Re: LCD driver BF537

Mike Frysinger (UNITED STATES)

Message: 64175   

there is no documentation atm other than the source ... look at the portmux header

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2008-10-24 13:07:26     Re: LCD driver BF537

Frank Van Hooft (CANADA)

Message: 64176   

Port_Mux is used to control the functionality of a handful of pins, timer5 being one of them. See Figure 14-9 in the BF537 HRM. You can use the bfin_write_PORT_MUX and bfin_read_PORT_MUX functions (in kernel space) to control it depending upon your needs. For example:

bfin_write_PORT_MUX ( bfin_read_PORT_MUX() & ~PGSE );    // clear PGSE bit in portmux register

Note that PORT_MUX is not the only thing you need to do to control a pin - all the other usual things (setting the pin to output, etc) also still apply. PORT_MUX is an extra requirement for certain pins.

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2008-10-24 13:11:11     Re: LCD driver BF537

Mike Frysinger (UNITED STATES)

Message: 64177   

people should not touch the port muxing registers directly.  that is why we have the peripheral framework.

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2008-10-24 15:09:18     Re: LCD driver BF537

damien OLLIVE (UNITED STATES)

Message: 64181   

OK thanks for your respond.

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2009-01-05 15:24:43     timer BF537

damien OLLIVE (UNITED STATES)

Message: 67388   

Hy,

I need help with the timer

I want to have a timer in the P11 TIMERS port.

i use 3 timers (0, 1 and 2) in my driver and i had a forth like that but that don't working:

#define TIMERS {P_TMR0, P_TMR1, P_TMR2, P_TMR3, 0}

#define bfin_write_TIMER_DECLK_CONFIG  bfin_write_TIMER3_CONFIG

#define bfin_write_TIMER_DECLK_WIDTH  bfin_write_TIMER3_WIDTH

#define bfin_write_TIMER_DECLK_PERIOD bfin_write_TIMER3_PERIOD

#define TIMDIS_DECLK   TIMDIS3

#define TIMEN_DECLK   TIMEN3

static void start_timers(void)

{

unsigned long flags;

printk("timerstart\n");

local_irq_save(flags);

bfin_write_TIMER_ENABLE(TIMEN3|TIMEN2|TIMEN0|TIMEN1);

SSYNC();

t_conf_done = 1;

local_irq_restore(flags);

}

static void config_timers(void)

{

/* Stop timers */

bfin_write_TIMER_DISABLE(TIMDIS_HS|TIMDIS_VS|TIMDIS_PPICLK|TIMDIS_DECLK);

SSYNC();

/* DE */

bfin_write_TIMER_DECLK_CONFIG(PWM_OUT|PERIOD_CNT|TIN_SEL);

bfin_write_TIMER_DECLK_WIDTH( 4 );

bfin_write_TIMER_DECLK_PERIOD(527); //kHz pour une CLK à 9.1MHz aulieu de 533

SSYNC();

}

static int request_ports(void)

{

    u16 ppi_req[] = PPI0_16;

    u16 tmr_req[] = TIMERS;

    if (peripheral_request_list(ppi_req, DRIVER_NAME)) {

        printk(KERN_ERR "Requesting Peripherals PPI faild\n");

        return -EFAULT;

    }

    if (peripheral_request_list(tmr_req, DRIVER_NAME)) {

        peripheral_free_list(ppi_req);

        printk(KERN_ERR "Requesting Peripherals TMR faild\n");

        return -EFAULT;

    }

static void free_ports(void)

{

    u16 ppi_req[] = PPI0_16;

    u16 tmr_req[] = TIMERS;

    peripheral_free_list(ppi_req);

    peripheral_free_list(tmr_req);

}

How configure the port 11 to enable the timer?

The peripheral_request_list function is not enough?

If somebody have an exemple of a program with a timer on P11 that could help me.