STM32 LTDC TFT-LCD controller and low power modes
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‎2016-10-04 03:53 PM
Hello, I have trouble understanding something about the LTDC, bare LCDs and STM32 low power modes. If the TFT-LCD controller sends an image to a bare LCD (no controller, no framebuffer) and the STM32 then goes in STOP mode for a minute, will the image keep being displayed on the LCD ? Thank you, Jage
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‎2016-10-04 04:43 PM
I'm thinking no. The clocks and pin drivers are likely to be pulling the bulk of the current in any case.
Up vote any posts that you find helpful, it shows what's working..
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‎2016-10-04 04:55 PM
I would think no too but ''2.2.3 Running application steps'' (page 19) in ''Managing low-power consumption on STM32F7 Series
microcontrollers'' [1] has me doubting. In this low power example, an image is sent and the MCU goes in STOP mode but they don't say if the image is retained.1: www.st.com/resource/en/application_note/dm00219305.pdf- Mark as New
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‎2016-10-05 03:12 AM
Hi
vesuse.jage,The image Display is achieved during Sleep mode which is after Run-3 ( as indicated in
Figure 6. Application low-power transition states). Then the RTC wake-up the CPU to enter then to STOP mode. In the STOP mode, all the peripheral clocks are gated, so the display is stopped. The device remains in stop mode until RTC time elapsed or a wake-up bottom is pressed before that. Hope it is clear for You now.-Hannibal-- Mark as New
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‎2016-10-05 12:55 PM
Thank you for your answers. I will then use an LCD with a controller+framebuffer chip.
I would like to use an external SDRAM connected to the FMC too. Now, to transfer from this SDRAM and the LCD, are there any advantages to the LTDC or is FMC good enough ?We would like HS-USB too and : HS-USB+SDRAM+LCD over FMC is possible on LQFP144, HS-USB+SDRAM+LCD over LTDC would require LQFP176.Thank you !- Mark as New
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‎2016-10-07 10:44 AM
Hi vesuse.jage,
Yes the FMC do the job.-Hannibal-