SPI TFT change about esp32-miniwebradio

[schreibfaul1]

Hello,
if you use ports other than the default ports for SPI, speed reduction can help. See https://docs.espressif.com/projects/esp-idf/en/latest/api-reference/peripherals/spi_master.html

[alansbor]

Hello,

Your call takes place in the tft.cpp file

270 SPI.begin (TFT_SCK, TFT_MISO, TFT_MOSI, -1);

And in the file SPI.CPP

37 void SPIClass :: begin (int8_t sck, int8_t miso, int8_t mosi, int8_t ss)
38 {
    if (_spi) {
        return;
    }

    if (! _ div) {
        _div = spiFrequencyToClockDiv (_freq);
    }

    _spi = spiStartBus (_spi_num, _div, SPI_MODE0, SPI_MSBFIRST);
    if (! _ spi) {
        return;
    }

    if (sck == -1 && miso == -1 && mosi == -1 && ss == -1) {
        _sck = (_spi_num == VSPI)? SCK: 14;
        _miso = (_spi_num == VSPI)? MISO: 12;
        _mosi = (_spi_num == VSPI)? MOSI: 13;
        _ss = (_spi_num == VSPI)? SS: 15;

The default is 12,13,14,15 for the VSPI mode, like mine. I understood. It should be in the call line
MiniWebRadio.ino call to do do without parameters

You
740 tft.begin (TFT_CS, TFT_DC, SPI_MOSI, SPI_MISO, SPI_SCK, TFT_BL); // Init TFT interface

I will have 740 tft.begin (); // Init TFT interface

I'll try to accomplish my goal. Thanks for the help.

[stale]

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[AVRsteffen]

#26
alansbor wrote:

The default is 12,13,14,15 for the VSPI mode

    if (sck == -1 && miso == -1 && mosi == -1 && ss == -1) {         
           _sck = (_spi_num == VSPI)? SCK: 14;         
         _miso = (_spi_num == VSPI)? MISO: 12;
         _mosi = (_spi_num == VSPI)? MOSI: 13;
         _ss = (_spi_num == VSPI)? SS: 15; 

I am not firm in 'C' or 'C++' but a bit in Verilog. And in this Verilog language mean this
_miso = (_spi_num == VSPI)? MISO: 12;
expression:

  if _spi_num equal to VSPI than`
      _miso = MISO 
  else 
      _miso = 12"

I have massive Problems to use GPIO21 + GPIO22 for TFT_CS and TFT_DC together with SPI_SCK=18, SPI_MISO=19, SPI_MOSI=23!
The TFT clocked with 40MHz don't work.

But if I use - and this is the Only condition for work with 40MHz - TFT_CS=13 and TFT_DC=12

ESP32 is a Mystery!