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MSP430FR59221: TV local dimming function, need GPIO simulate into SPI

Drina Dai
Prodigy 70 points

Part Number: MSP430FR59221

To realize TV local dimming function, need MSP430 control 64pcs iwatt backlighting IC to drive 1024CHs backlighting. 

1. How to simulate GPIO into SPI

2. SPI and soft SPI function test

3. soft optimization

  • 0
    TI__Mastermind 46765 points
    Hi Drina,
    Could you please provide more information about your design?
    Like, how many SPI ports you are going to use?
    How do you connect the 64pcs backlighting ICs to the MCU?
    How many GPIO pins you can use for software SPI?
    Thanks!

    Best regards,
    Cash Hao
  • 0 in reply to Cash Hao11
    Prodigy 10 points
    Hi Cash,
    We are going to try to use one pcs MSP control 64pcs iWatt IC, and a iWatt IC can control 16channel, iWatt SPI daisy chain connection can only support 62pcs of the iWatt IC, so our idea is try to add GPIO simulate into SPI to control this 64pcs iWatt IC.Becasuse the MSP only has two hardware SPI interface, the MSP need to be used as slave and master.The MSP's function is used for transfering blacklight data from V5 to iwatt.If there is a better way, better.
    Best regards,
    Kong Lingyong
  • 0 in reply to user5148009
    TI__Mastermind 46765 points
    Hi Kong,
    In your design, 62pcs iWatt IC will use one SPI port and V5 will use one SPI port. There are two iWatt IC left. So you may need two extra software SPI port.
    There aren't any code examples available from TI but I am sure the forum community or an online search could help you get started with examples.
    You can refer to this E2E question e2e.ti.com/.../341081

    Best regards,
    Cash Hao

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