[LP5562] Load LED pattern to ENG question

Chuang KenZ

Prodigy 170 points

Other Parts Discussed in Thread: LP5562

Hi~

I used the LP5562 for RGBW LED driver. I can control it by I2C PWM mode. But I cannot load the pattern to the SRAM.

I read back the SRAM. It's different from my pattern.

BR, KenZ

May you review my instrument?

//LEDEN GPIO
P1SEL &= ~(0x02);    /* Set pin function to GPIO */
P1DIR |= (0x02);    /* Set pin direction to Output */
P1 &= ~(0x02);
HW_WaitUs(500); //delay 500us
P1|=(0x02);
   /*power on routine*/
        HW_WaitUs(1000); //delay 1ms
        lp5562_REG_write(LP5562_CH, LP5562_REG_ENABLE, LP5562_ENABLE_DEFAULT);// chip_en=1
        HW_WaitUs(500); //delay 500us

        lp5562_REG_write(LP5562_CH, 0x08, 0x21);// enable internal clk
        lp5562_REG_write(LP5562_CH, LP5562_REG_ENG_SEL, 0x00);// Set LED controlled by I2C
        // Set LED current 14mA
        lp5562_REG_write(LP5562_CH, LP5562_REG_R_CURRENT, 0x8c);
        lp5562_REG_write(LP5562_CH, LP5562_REG_G_CURRENT, 0x8c);
        lp5562_REG_write(LP5562_CH, LP5562_REG_B_CURRENT, 0x8c);
        lp5562_REG_write(LP5562_CH, LP5562_REG_W_CURRENT, 0x8c);
        //PWM value
        lp5562_LED(LP5562_CH, LEDW);
        //Pattern Load
        lp5562_REG_write(LP5562_CH, 0x01, 0x10);

        //lp5562_ENG_write(LP5562_CH, LP5562_REG_PROG_MEM_ENG1); //ENG1 load breath pattern
        lp5562_REG_write(LP5562_CH, 0x10, 0x03);
        lp5562_REG_write(LP5562_CH, 0x11, 0x7f);
        lp5562_REG_write(LP5562_CH, 0x12, 0x4d);
        lp5562_REG_write(LP5562_CH, 0x13, 0x00);
        lp5562_REG_write(LP5562_CH, 0x14, 0x03);
        lp5562_REG_write(LP5562_CH, 0x15, 0xff);
        lp5562_REG_write(LP5562_CH, 0x16, 0x60);
        lp5562_REG_write(LP5562_CH, 0x17, 0x00);
        lp5562_REG_write(LP5562_CH, 0x18, 0x00);
        lp5562_REG_write(LP5562_CH, 0x19, 0x00);

        //Enable ENG1
        lp5562_REG_write(LP5562_CH, 0x01, 0x20);
        lp5562_REG_write(LP5562_CH, 0x00, 0x60);
        // Set LEDW with ENG1
        lp5562_REG_write(LP5562_CH, LP5562_REG_ENG_SEL, LP5562_ENG1_FOR_W);// Set LED controlled by I2C

        lp5562_REG_Read(LP5562_CH, 0x10);
        if(buf[0]==0x03) for(;;);
        else for(;;);

over 8 years ago

0 Tomi Koskela over 8 years ago

TI__Genius 11020 points

Hello,

To be able to write to SRAM you need to set the program engines to LOAD Program mode, see datasheet page 16 for more details.

Thanks.

0 Chuang KenZ over 8 years ago in reply to Tomi Koskela

Prodigy 170 points

Hi~ Tomi:

Thanks for your response.

I already followed the example on page21.

Per the spec, set to LOAD Program.

lp5562_REG_write(LP5562_CH, 0x01, 0x10);

Supposed that several setting are not in the page21.

May you share your experience?

I also refered the linux driver which is shared from Milo(Woogyom) Kim on GitHub.

I cannot find out the difference.

The other question, may we read the SRAM?

On the spec, there is no R\W related information for SRAM(0x10~0x6F).

BR, KenZ

0 Tomi Koskela over 8 years ago in reply to Chuang KenZ

TI__Genius 11020 points

Hello,
Please note that if you use many engines, all engines should be in Load Program mode when writing to SRAM.
SRAM memory read is allowed, however autoincrement (sequential read) cannot be used. Please see page 23 in the datasheet.
Do you have an evalation board try these settings?Thanks.

0 Chuang KenZ over 8 years ago in reply to Tomi Koskela

Prodigy 170 points

Dear Tomi:

Thanks for your support~

I fixed this issue.

BR, KenZ

0 Jerry Juan over 7 years ago in reply to Chuang KenZ

Prodigy 35 points

Hi Kenz,

May I know how did you fix this issue? It seems I encountered the same problem.
Could you help to share it? Thanks.

0 Jerry Juan over 7 years ago in reply to Tomi Koskela

Prodigy 35 points

Hi Tomi,

I tried to load pattern but after I follow the sequence to set it to load program mode and write data to SRAM.
Then I tried to read it back, all data are still 0x00, it looks likes I failed to write data to SRAM from 0x10~0x19. Could you help to advise it? Thanks.

0 Chuang KenZ over 7 years ago in reply to Jerry Juan

Prodigy 170 points

Hi~Jerry:

I loaded the pattern before LED On routine.

Please try to load pattern before LED PWM\Current setting.

BR, KenZ

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[LP5562] Load LED pattern to ENG question