ESP32-P4 released, support?

[Yelgurk]

Good afternoon! ESP32-P4 chip has been released.

• https://www.espressif.com/en/products/socs/esp32-p4
• https://www.youtube.com/watch?v=GTHHDZeIzcA

It is still difficult to buy it on the free market, but already some companies seem to be able to buy the first revisions and build modules based on these chips.

• https://www.wireless-tag.com/product-item-61.html
• https://img01.71360.com/w3/77q677/20240409/025a34d13f1a027cb65d0cd9e1f52467.pdf?dl=1&dlf=WT01P4C6-S1%E8%A7%84%E6%A0%BC%E4%B9%A6V1.1.pdf

[Yelgurk]

Some additional info, esp32-p4 datasheet: https://www.erlendervik.no/ESP32-C5%20Beta_ESP32-P4_ESP8686_ESP32-C3FH4X/ESP32_P4_Chip_Datasheet_V0.1_PRELIMINARY_EN.pdf

[tobozo]

hi

esp32-p4 support will be considered as soon as v5.3 hits the support matrix

[tobozo]

now that they use AI, google search results are so mediocre they make aliexpress search results look pertinent 🤣

that's the only p4-based product I could find (apart from the 120$ ev-kit from espressif), and it's out of stock :

https://www.waveshare.com/esp32-p4-nano.htm

let's hope for some p4-based product announcements after the Chinese new year 🐍

[SlyRebula]

Thank you for willing to buy it to develop support! You might able to buy from this site for cheaper i think only diffrence is it has no 32 or 16 mb psram: https://www.olimex.com/Products/IoT/ESP32-P4/

[tobozo]

Thanks, I've ordered the olimex kit 👍

The first objective for LovyanGFX will be to validate i2c/spi legacy bus support for existing panels with ESP32-P4.

MIPI/QSPI support for LovyanGFX isn't ready yet, but I'm wondering how many (if not all) of those raspberry pi panels it 'll bring into LovyanGFX scope

[tobozo]

found another P4-based board, from the CYD family https://www.aliexpress.com/item/1005008328088576.html

[tobozo]

@SlyRebula just received the olimex board, and it has 32mb of psram, Olimex probably forgot to add that detail to the product description, it's visible on the back of the board anyway.

I don't have the skills to do all these tasks, but here's the what I have identified so far :

• Add #if defined CONFIG_IDF_TARGET_ESP32P4 conditional macros wherever include errors occur
• Migrate SPI/I2C : periph_module_{enable,disable,reset}() functions are all deprecated with ESP32P4, recommended implementation is to "use RCC lock macros", but I have no idea what this means.
• Fix DMA : according to esp_lcd library, ESP32P4 should use dma2d_reg.h, dma2d_channel.h and dma2d_struct.h with MIPI-DSI whereas LovyanGFX uses a generic SPI DMA channel

[tobozo]

followup for the Olimex ESP32-P4-DevKit:

SSD1306: although there are some warnings, I2C seems to work

ILI9341:

• some warnings are emitted at compilation:

~/.arduino15/packages/esp32-3.2.0/tools/esp32-arduino-libs/idf-release_v5.4-2f7dcd86-v1/esp32p4/include/esp_hw_support/include/esp_private/periph_ctrl.h:87:64: warning: invalid suffix on literal; C++11 requires a space between literal and string macro [-Wliteral-suffix]
   87 | #define __PERIPH_CTRL_DEPRECATE_ATTR __attribute__((deprecated("This function is not functional on "CONFIG_IDF_TARGET)))
~/Arduino/libraries/LovyanGFX/src/lgfx/v1/platforms/esp32/common.cpp: In function 'cpp::bitwizeshift::result<void, lgfx::v1::error_t> lgfx::v1::spi::init(int, int, int, int, int)':
~/Arduino/libraries/LovyanGFX/src/lgfx/v1/platforms/esp32/common.cpp:593:7: warning: array subscript 0 is outside array bounds of 'volatile uint32_t [0]' [-Warray-bounds=]
  593 |       *reg(SPI_USER_REG(spi_port)) = SPI_USR_MOSI | SPI_USR_MISO | SPI_DOUTDIN;  // need SD card access (full duplex setting)
      |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1plus: note: source object is likely at address zero
~/Arduino/libraries/LovyanGFX/src/lgfx/v1/platforms/esp32/common.cpp: In function 'cpp::bitwizeshift::result<void, lgfx::v1::error_t> lgfx::v1::spi::initQuad(int, int, int, int, int, int, int)':
~/Arduino/libraries/LovyanGFX/src/lgfx/v1/platforms/esp32/common.cpp:673:7: warning: array subscript 0 is outside array bounds of 'volatile uint32_t [0]' [-Warray-bounds=]
  673 |       *reg(SPI_USER_REG(spi_port)) = SPI_USR_MOSI | SPI_USR_MISO | SPI_DOUTDIN;  // need SD card access (full duplex setting)
      |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1plus: note: source object is likely at address zero
~/Arduino/libraries/LovyanGFX/src/lgfx/v1/platforms/esp32/Bus_SPI.cpp: In member function 'virtual void lgfx::v1::Bus_SPI::beginTransaction()':
~/Arduino/libraries/LovyanGFX/src/lgfx/v1/platforms/esp32/Bus_SPI.cpp:278:5: warning: array subscript 0 is outside array bounds of 'volatile uint32_t [0]' [-Warray-bounds=]
  278 |     *reg(SPI_PIN_REG(spi_port)) = pin;
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1plus: note: source object is likely at address zero
~/Arduino/libraries/LovyanGFX/src/lgfx/v1/platforms/esp32/common.cpp: In function 'void lgfx::v1::spi::beginTransaction(int, uint32_t, int)':
~/Arduino/libraries/LovyanGFX/src/lgfx/v1/platforms/esp32/common.cpp:763:7: warning: array subscript 0 is outside array bounds of 'volatile uint32_t [0]' [-Warray-bounds=]
  763 |       *reg(SPI_USER_REG(spi_port)) = user;
      |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1plus: note: source object is likely at address zero
~/Arduino/libraries/LovyanGFX/src/lgfx/v1/platforms/esp32/common.cpp:767:7: warning: array subscript 0 is outside array bounds of 'volatile uint32_t [0]' [-Warray-bounds=]
  767 |       *reg(SPI_MISC_REG( spi_port)) = pin;
      |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1plus: note: source object is likely at address zero
~/Arduino/libraries/LovyanGFX/src/lgfx/v1/platforms/esp32/common.cpp:769:7: warning: array subscript 0 is outside array bounds of 'volatile uint32_t [0]' [-Warray-bounds=]
  769 |       *reg(SPI_CLOCK_REG(spi_port)) = clkdiv;
      |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1plus: note: source object is likely at address zero
~/Arduino/libraries/LovyanGFX/src/lgfx/v1/platforms/esp32/common.cpp: In function 'void lgfx::v1::spi::writeBytes(int, const uint8_t*, size_t)':
~/Arduino/libraries/LovyanGFX/src/lgfx/v1/platforms/esp32/common.cpp:799:7: warning: array subscript 0 is outside array bounds of 'volatile uint32_t [0]' [-Warray-bounds=]
  799 |       *reg(SPI_MOSI_DLEN_REG(spi_port)) = (len << 3) - 1;
      |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1plus: note: source object is likely at address zero
~/Arduino/libraries/LovyanGFX/src/lgfx/v1/platforms/esp32/common.cpp: In function 'void lgfx::v1::spi::readBytes(int, uint8_t*, size_t)':
~/Arduino/libraries/LovyanGFX/src/lgfx/v1/platforms/esp32/common.cpp:810:7: warning: array subscript 0 is outside array bounds of 'volatile uint32_t [0]' [-Warray-bounds=]
  810 |       *reg(SPI_MOSI_DLEN_REG(spi_port)) = (len << 3) - 1;

• Bus_SPI crashes at runtime. Although the correct riscv32-esp-elf-gdb utility is called, ESP32 Exception Decoder is unable to decode the stack trace I'm getting with Arduino.

All this and ESP32-P4 being a little endian chip probably means a dedicated Bus_SPI class for ESP32-P4 is needed.

[PhonicUK]

Just seconding my interest on this - I've got some S3 projects I'd love to move over to the P4.

[tobozo]

btw there's a MIPI-DSI panel profile for M5Stack Tab5 (ESP32-P4 + ILI9881C) in M5GFX source tree

[tobozo]

M5Stack Tab5 experimental support is available on M5GFX_Backport branch.

[tobozo]

followup for the Olimex ESP32-P4-DevKit + Bus_SPI + ILI9341:

panel started working with current develop branch after exclusively selecting pin numbers under 31 for wiring

apparently Bus_SPI is masking pin numbers with & 31, which has probably been valid until P4 showed up, but will eventually need to be revisited

here's the config I'm using:

[edit] added touch

class Olimex_P4_SPI_ILI9341 : public lgfx::LGFX_Device
{
  lgfx::Panel_ILI9341 _panel_instance;
  lgfx::Bus_SPI       _bus_instance;
  lgfx::Light_PWM     _light_instance;

  public:

    Olimex_P4_SPI_ILI9341()
    {

      {
        auto cfg = _bus_instance.config();
        cfg.freq_write = 80000000;
        cfg.freq_read  = 16000000;
        cfg.pin_mosi = GPIO_NUM_23;
        cfg.pin_miso = GPIO_NUM_22;
        cfg.pin_sclk = GPIO_NUM_5;
        cfg.spi_host = SPI2_HOST;
        cfg.pin_dc   = GPIO_NUM_21;
        cfg.spi_mode = 0 ;
        _bus_instance.config(cfg);
        _panel_instance.bus(&_bus_instance);
      }

      {
        auto cfg = _panel_instance.config();
        cfg.pin_cs  = GPIO_NUM_6;
        cfg.pin_rst = GPIO_NUM_4;
        _panel_instance.config(cfg);
      }


      {
        auto cfg = _touch_instance.config();
        auto buscfg = _bus_instance.config();
        cfg.bus_shared = true;
        cfg.pin_mosi = buscfg.pin_mosi;
        cfg.pin_miso = buscfg.pin_miso;
        cfg.pin_sclk = buscfg.pin_sclk;
        cfg.spi_host = buscfg.spi_host;
        cfg.pin_cs   = GPIO_NUM_20;
        _touch_instance.config(cfg);
        _panel_instance.setTouch(&_touch_instance);
      }

      {
        auto cfg = _light_instance.config();
        cfg.pin_bl = GPIO_NUM_2 ; // Backlight pin
        //cfg.invert = false;
        _light_instance.config(cfg);
        _panel_instance.setLight(&_light_instance);
      }

      setPanel(&_panel_instance);

    }
};