Problem with installing DMX on UART2

[k-dedman]

Any time I try to set up UART2 with dmx_driver_install the program crashes. I am trying to setup all 3 UART ports with a DMX output, I do not need RX or the enable pin. I have tried setting up UART2 on an ESP32-WROOM-32D and a WT32-ETH01 module, both modules crash when trying to setup UART2. UART0 & UART1 are working as intended. I have stripped my project to only setup UART2 and it still crashes. I am using Arduino IDE with esp_dmx 4.1.0

dmx_port_t dmxPort0 = DMX_NUM_0;
dmx_port_t dmxPort1 = DMX_NUM_1;
dmx_port_t dmxPort2 = DMX_NUM_2;

uint8_t dmx0_tx_pin = 1;
uint8_t dmx1_tx_pin = 18;
uint8_t dmx2_tx_pin = 21;

void dmx_setup(void)
{
    dmx_config_t config0 = DMX_CONFIG_DEFAULT;
    dmx_config_t config1 = DMX_CONFIG_DEFAULT;
    dmx_config_t config2 = DMX_CONFIG_DEFAULT;
    dmx_personality_t personalities0[] = {};
    dmx_personality_t personalities1[] = {};
    dmx_personality_t personalities2[] = {};
    int personality_count0 = 0;
    int personality_count1 = 0;
    int personality_count2 = 0;
    dmx_driver_install(dmxPort0, &config0, personalities0, personality_count0);
    dmx_set_pin(dmxPort0, dmx0_tx_pin, -1, -1);
    dmx_driver_install(dmxPort1, &config1, personalities1, personality_count1);
    dmx_set_pin(dmxPort1, dmx1_tx_pin, -1, -1);
    dmx_driver_install(dmxPort2, &config2, personalities2, personality_count2); // Crashes here
    dmx_set_pin(dmxPort2, dmx2_tx_pin, -1, -1);

}

[riwalker]

assume you checked the pins, some UARTS have non moveable UART functions (i.e the C6 UART2 has to be on 5 & 4)
I submitted some changes which were included in 4.1.0 for UART2 specifically for the LP (Low-Power) UART which is UART2 on the C6 family. it may be these changes which are now jarring with the older (none LP) UARTS.
look at uart.c (see dmx_art_init(), line ~341) , we may need some additional changes to check for non LP uarts, or only apply the recent changes ONLY for the C6

[k-dedman]

Thanks for the reply.

The problem is the code never gets to the point where it can set the pins for UART2, if i comment everything out but the dmx_driver_install for UART2, it still crashes.

I looked into the CONFIG_IDF_TARGET_ESP32C6 #ifdef's and commented out the code just to make sure it was initialising UART2 normally and it still crashes. The pins for UART2 should be remappable for the WT32-ETH01 dev board.

I have also made sure that I can setup a serial output on UART2 and that works, so the port can definitely be used.

I have got DMX output working for UART0 (tx pin 1), UART1 (tx pin 17 or 14), but I cannot get it to work on UART2

[k-dedman]

Ok I got it working.

Not sure whats going wrong but heres how I fixed it.

The program was failing whenever it hit uart_ll_set_sclk due to a null pointer at uart->dev
I removed the check for including UART2 in the dmx_uart_t struct initialisation and the dmx port constant enum. I also explicitly defined &UART2 instead of using the UART_LL_GET_HW function.

static struct dmx_uart_t {
  const int num;
  uart_dev_t *const dev;
  intr_handle_t isr_handle;
} dmx_uart_context[DMX_NUM_MAX] = {
    {.num = 0, .dev = UART_LL_GET_HW(0)},
    {.num = 1, .dev = UART_LL_GET_HW(1)},
// #if DMX_NUM_MAX > 2
    {.num = 2, .dev = &UART2},
// #endif
};

/** @brief DMX port constants.*/
enum {
  DMX_NUM_0, /** @brief DMX port 0.*/
  DMX_NUM_1, /** @brief DMX port 1.*/
// #if SOC_UART_NUM > 2
  DMX_NUM_2, /** @brief DMX port 2.*/
// #endif
  DMX_NUM_MAX /** @brief DMX port max. Used for error checking.*/
};

I now have 3 seperate DMX TX outputs tested and working. Im not sure why this fix works as the ESP32 core should have 3 UARTS available and I had tested this with HardwareSerial.

[riwalker]

Agree, I also in past versions had to code out the same struct #if test for UART2 and force it, although the latest code works for the LP UART on the C6.
its been a nightmare for the latest esp-idf code rolls, they are making huge code changes around the LP UART, hence why I provided the new routines for UART2 init, its changed every time for the last 3 or 4 esp-idf library release (5.0 to 5.2+)

[GIPdA]

Hello!
Got the same issue today with ESP-IDF and the v4.1.0 release, for an ESP32-C3.
I fixed it with a small change in uart.c, line 32:

#if SOC_UART_NUM > 2

Currently DMX_NUM_MAX is used, but it's an enum and cannot be used in pre-processor.

[bensuffolk]

This sounds like a problem I have having as well. I have just tried to upgrade from 3.0.3-beta that I have been successfully using on esp-idf 4.4.5 with DMX_NUM_1 and DMX_NUM_2 as the 2 UARTS.

I am using an original ESP32-WROVER

Now I have 4.1.0 it crashes when trying to install the dmx driver for UART2. I have not changed the version of esp-idf.

Guru Meditation Error: Core  0 panic'ed (LoadProhibited). Exception was unhandled.

...

#0  0x400fb617:0x3ffb8240 in uart_ll_set_sclk at /Users/suffo_b/.platformio/packages/framework-espidf/components/hal/esp32/include/hal/uart_ll.h:76
      (inlined by) dmx_uart_init at components/esp_dmx-4.1.0/src/dmx/hal/uart.c:357
#1  0x400f779d:0x3ffb8260 in dmx_driver_install at components/esp_dmx-4.1.0/src/dmx/driver.c:226

[riwalker]

Seems the same as issue #150 #150 (comment) From: Ben Suffolk ***@***.***> Sent: Tuesday, June 11, 2024 5:32 PM To: someweisguy/esp_dmx ***@***.***> Cc: riwalker ***@***.***>; Comment ***@***.***> Subject: Re: [someweisguy/esp_dmx] Problem with installing DMX on UART2 (Issue #150) This sounds like a problem I have having as well. I have just tried to upgrade from 3.0.3-beta that I have been successfully using on esp-idf 4.4.5 with DMX_NUM_1 and DMX_NUM_2 as the 2 UARTS. I am using an original ESP32-WROVER Now I have 4.1.0 it crashes when trying to install the dmx driver for UART2. I have not changed the version of esp-idf. Guru Meditation Error: Core 0 panic'ed (LoadProhibited). Exception was unhandled. .. #0 0x400fb617:0x3ffb8240 in uart_ll_set_sclk at /Users/suffo_b/.platformio/packages/framework-espidf/components/hal/esp32/include/hal/uart_ll.h:76 (inlined by) dmx_uart_init at components/esp_dmx-4.1.0/src/dmx/hal/uart.c:357 #1 0x400f779d:0x3ffb8260 in dmx_driver_install at components/esp_dmx-4.1.0/src/dmx/driver.c:226 — Reply to this email directly, view it on GitHub <#150 (comment)> , or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABIKT5XPKLOZLNF37ZFMQVTZG5UDZAVCNFSM6AAAAABFKY2YKCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDCNRRGYZTCMJYHE> . You are receiving this because you commented. <https://github.com/notifications/beacon/ABIKT5VA55XQGCIWLV7HDQLZG5UDZA5CNFSM6AAAAABFKY2YKCWGG33NNVSW45C7OR4XAZNMJFZXG5LFINXW23LFNZ2KUY3PNVWWK3TUL5UWJTUA27P5K.gif> Message ID: ***@***.*** ***@***.***> >