Neopixel LED driver control

Bunny · October 24, 2024, 7:34pm

Hi,
I would like to use neopixel to control an external led strip using one of the AUX outputs. I am using Cubeorange and PX4 version 1.15.0.
I have been able to combilple and start the neopixel driver.

I have also referred to issue:

github.com/PX4/PX4-Autopilot

DMA issue on fmuv6x with neopixel driver

opened 03:27PM - 01 Dec 22 UTC

closed 12:01PM - 13 Jan 23 UTC

sebglatz

bug-report

## Describe the bug Running the neopixel driver on a holybro pixhawk 6x does no…t produce the expected signal. I use the dma-version of this driver: `srgbled_dma.cpp` and the latest release (v1.13.2). ## To Reproduce Added to `fmu-v6x/src/board_config.h`: ``` # define BOARD_HAS_N_S_RGB_LED 10 # define S_RGB_LED_DMA DMAMAP_TIM5_CH4 /* Note, this is DMAMUX1 and DMA-Mux-Index 101 */ # define S_RGB_LED_TIMER 5 /* timer 5 */ # define S_RGB_LED_CHANNEL 4 /* channel 4 */ // # define S_RGB_LED_CHANNELN 1 /* channel 4N */ # define S_RGB_LED_TIM_GPIO GPIO_TIM5_CH4OUT_2 /* PI0 aka FMU_CH1*/ ``` Build and flash, then in nsh: `neopixel start` ## Expected behavior I would expect to see a pwm-like signal on pin FMU_CH1 of two different duty-cycles. Total bit time is 1200 ns, 0b1(600ns|600ns) 0b0(300ns|900ns). ## Log Files and Screenshots The signal on FMU_CH1 is either constantly zero, or if I enable DMA-debug-prints and disable DMA on the serial console (because it would freeze otherwise) I get a weird non-const signal with some pulses that have nothing to do with the expected behaviour. log: https://logs.px4.io/plot_app?log=b063b920-a603-4820-9d73-71acd0f30f78 ## Drone (please complete the following information): holybro pixhawk 6x on baseboard mini, powered with USBC. ## Additional context With print statements in `stm32h7/stm32_dma.c` (for debugging), the serial console freezes. Configuring the serial console without DMA would solve the freezing issue.

and tried replicating as much as possible but I am unable to control the LEDs.
The driver reports to be controlling the leds when calling neopixel status , but no output is send to the gpio.

I’ve set up the DMA configuration as follows in board_config.h:

#if defined(USE_S_RGB_LED_DMA)
#  define S_RGB_LED_DMA              DMAMAP_DMA12_TIM1CH2_1
#  define S_RGB_LED_TIMER            1                        // Timer 1
#  define S_RGB_LED_CHANNEL          2                        // Channel 2 for AUX6
#  define S_RGB_LED_CHANNELN         1                        // Not used
#  define S_RGB_LED_TIM_GPIO         GPIO_TIM1_CH2OUT_2    
#endif

Does anyone know how to control the neopixel using AUX pin?