How to set i.MX6 IPU DI HSYNC polarity.

[satoshishimoda]

Hi community,

I have a questoin about i.MX6SDL IPU.

I found IPU DI VSYNC polarity setting register in chapter 37.4.3 in IMX6SDLRM (Rev.1.).

However, I cannot the one for HSYNC polarity even though I checked not only IOMUX registers but also IPU registers.

So could you let me know how to set the HSYNC polarity?

Best Regards,

Satoshi Shimoda

[Yuri · Accepted solution]

  The signal waveforms of the i.MX6 IPU are programmed in software (microcode) way.

In particular, please look at subsection “Polarity generator” in section 38.4.10 “Display
Interface (DI)” of the i.MX6 SDL Reference Manual (RM).

Also please refer to bit filed “di0_polarity_i_1” in IPU_DI0_GENERAL register, which is

responsible for the DIx_PIN01- DIx_PIN07 general purpose synchronous pins,

mentioned in Table 66 (Video Signal Cross-Reference) of the Datasheet (IMX6SDLCEC).

DIx_PIN01 corresponds to di0_polarity_i_1 [bit 0]

DIx_PIN02 (HSYNC) corresponds to field di0_polarity_i_1 [bit 1] and e.t.c.

  Please look at section 38.5.193 [DI0 General Register (IPU_DI0_GENERAL)] of the RM.