PSRAM changes IO behaviour of ESP32-CAM

[esp-dev]

Hello,

I've been working with ESP32-CAM implementing the WS2812 with RMT. On the first deployment, the WS2812 works fine, but if I enable the PSRAM (required for accessing cam) the IO behaviour is uncertain.

I'm using IO33 as my signal pin to WS2812. While probing that IO the behaviour is shown.

Before enabling PSRAM

PSRAM_NOT_ENABLED.png (31.87 KiB) Viewed 6049 times

After enabling PSRAM

PSRAM_ENABLED.png (55.88 KiB) Viewed 6049 times

My CPU core is running at 240MHz and the flash size is 4MB

What am I missing? Any additional configurations required to work with PSRAM?

[ESP_Sprite]

Can you post your RMT code?

[esp-dev]

Code: [Select all] [Expand/Collapse]

1. void setup_rmt_data_buffer(rgbVal *pixels)
2. {
3.   // --
4.   for (uint32_t led = 0; led < NUM_LEDS; led++) {
5.     uint32_t bits_to_send = 0;
6.     bits_to_send += (pixels[led].r) << 8;
7.     bits_to_send += (pixels[led].g);
8.     bits_to_send += (pixels[led].b) << 16;
9.  
10.     uint32_t mask = 1 << (BITS_PER_LED_CMD - 1);
11.     for (uint32_t bit = 0; bit < BITS_PER_LED_CMD; bit++) {
12.       uint32_t bit_is_set = bits_to_send & mask;
13.       led_data_buffer[led * BITS_PER_LED_CMD + bit] = bit_is_set ?
14.                                                       (rmt_item32_t){{{T1H, 1, TL, 0}}} :
15.                                                       (rmt_item32_t){{{T0H, 1, TL, 0}}};
16.       mask >>= 1;
17.     }

GeSHi © Codebox Plus Extension

Here is where I'm generating the timing. Let me know if this helps.

[ESP_Sprite]

Nothing particularily wrong there. Can you post your entire project, perhaps? It's odd that the two waveforms seem to be the exact inverse of eachother.

[esp-dev]

Here is the project file.

[esp-dev]

ESP_Sprite - Did you had a chance to take a look into the project file I've shared?

[ESP_Sprite]

The RMT WS2811 driver itself is missing there?

[esp-dev]

You mean in the components dir?

[ESP_Sprite]

That zip file does not have a components dir when I download it?

[esp-dev]

ESP_Sprite - Thanks for looking into the file I provided. I managed to get it working with PSRAM enabled after changing ws2812_control_init().

Code: Select all

rmt_config_t config = RMT_DEFAULT_CONFIG_TX(LED_RMT_TX_GPIO, LED_RMT_TX_CHANNEL);
config.clk_div = 2;
ESP_ERROR_CHECK(rmt_config(&config));
ESP_ERROR_CHECK(rmt_driver_install(config.channel, 0, 0));