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LP5569: running a engine at startup

Burak Belenlioglu
Prodigy 10 points
Part Number: LP5569

Hi,

I have linux device and try to drive lp5569 on linux driver. 

I can control leds by i2c commands, i can change led brignighst etc.

I want one led to blink while the device is switching on.

After the device is turned on, I can control the driver myself. But I cannot control the LP5569 until the driver is up. Because of this, I try to program the engine. But I can't run the engine.

my program is simple for test,

001    00    01FF   D123:       dw      0000000111111111b
002                       .segment   program1
003    01    9C00        map_start    D123
004    02    10FF        ramp            1, 255
005                       .segment program2
006    03    0000        rst
007                       .segment program3
008    04    0000        rst

like this. I'm waiting for all leds to light up. 

I changed ch1_mode to load from sram, I wrote "01FF9C0010FF00000000" in SRAM and set ENGINE1_PROG_START to 1. Then I checked that I did it by reading sram. 

I changed ch1_mode to run and chip_en to 1. But i didn't see the led light up. I tried to change ch1_exec to free run in LED_ENGINE_CONTROL1 register. But there was no change. 

I checked ENGINE_STATUS register, value is 128. ch1_int is 0. ENGINE1_PC Register is 0.  

What can be the problem? 

Can Engine1 run automatically when power up?

Thanks!

  • 0
    TI__Genius 12915 points

    Hi Burak,

    The engine code is OK. Before run the engine, you need to set charge pump enable (cp_mode, bit 4-3 of register 0x2f) and internal clock enable (int_clk_en, bit 0 of register 0x2f).

    The internal SRAM would be clear once powering off, so you need to re-write the codes after every powering up. The engine cannot run automatically when power up.