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Showing results for tags 'st7066u'.
Hi folks, I'm building my seq V4 and am facing a major problem: my LCD displays only show a row of black squares... I'm building a wilba frontpanel. The MBHP bootloader is in my STM32F4 board: MIOS Studio tells: Operating System : MIOS32 Board : MBHP_CORE_STM32F4 Core Family : STM32F4xx Chip ID: 0x10076413 Serial: #320041000D51353235363632 Flash Memory Size: 1048576 bytes RAM Size: 196608 bytes MIDIbox SEQ V4.092 MIOS Studio proposes 4 Midi Ins and outs for the Midibox (named MIDIbox SEQ V4, MIDIIN2 (MIDIBox Seq V4), MIDIIN3 (MIDIBox Seq V4) and MIDIIN4 (MIDIBox Seq V4). MIOS Studio is also able to see what's on my SD card, but it seems like the core board can't read neither the wilba MBSEQ_HW.V4 nor the standard MBSEQ_HW.V4 files which are located at the root of my SD card (when I try to edit the MBSEQ_HW.V4 with the MIOS File browser, I get an "Invalid response from MIOS32 core during read operation" after about 14% of the file has been downloaded) I must add that my frontpanel isn't completely finished yet, so nothing else than the LCD displays are plugged on the MBHP_core_PCB (bought on smashTV shop). This is the LCD I bought and its datasheet. It seems like the LCD for the seq V4 must use a HD44780 controller. The ones I got uses a ST7066U controller but are said to be compatible with HD44780... I tweeked the contrast and luminance pots but none of my tries gave any effect on displaying good things... I verified the connections and everything is at its own place (Seq ground to LCD ground, seq Vd to LCD Vd, etc. ) Any idea of what could be wrong ? Cheers, Tom.