Search found 3472 matches

by ESP_Sprite
Wed May 27, 2020 3:22 pm
Forum: ESP32 IDF
Topic: mismatch vTaskDelay and cycle count using XTHAL_GET_CCOUNT() ?
Replies: 4
Views: 2396

Re: mismatch vTaskDelay and cycle count using XTHAL_GET_CCOUNT() ?

CONFIG_ESP32_DEFAULT_CPU_FREQ_MHZ is a compile-time constant; it indicates the *default* CPU frequency. If you change the frequency at run-time, obviously the value doesn't match your situation anymore.
by ESP_Sprite
Wed May 27, 2020 8:48 am
Forum: ESP32 Arduino
Topic: Direct access to UART1 TX FIFO
Replies: 4
Views: 308

Re: Direct access to UART1 TX FIFO

Not sure, but perhaps UART_TX_IDLE_NUM has something to do with it? You may want to try setting that to 0.

While you're reading the TRM anyway, can I advise you to read into the RMT peripheral? It's actually designed to generate arbitrary waveforms and is way better at it than the UART will ever be.
by ESP_Sprite
Tue May 26, 2020 12:42 pm
Forum: General Discussion
Topic: HSPI and VSPI, meaning thereof?
Replies: 12
Views: 20370

Re: HSPI and VSPI, meaning thereof?

peterbaldock wrote:
Tue May 26, 2020 9:48 am
How about H_orizontal and V_ertical, for LCD interface?
...That makes no sense from a technological point of view, but if it makes you happy to think of them like that, I won't stop you.
by ESP_Sprite
Tue May 26, 2020 12:36 pm
Forum: ESP32 Arduino
Topic: ADC with I2S: increasing throughput to 2 MHz
Replies: 2
Views: 157

Re: ADC with I2S: increasing throughput to 2MSPS

If I recall the innards of the I2S driver correctly, the hardware will fill a buffer of `dma_buf_len` and then generate an interrupt for the I2S driver to handle that data. Given the fact that in your case, these are only 64 words, that is a great many interrupts a second... my gut feeling is that i...
by ESP_Sprite
Tue May 26, 2020 12:32 pm
Forum: General Discussion
Topic: wifi + I2s
Replies: 5
Views: 340

Re: wifi + I2s

'capturing' the WiFi signal from a cell phone? Can you be a bit more precise what protocol you're talking about? WiFi by itself doesn't specify audio transport.
by ESP_Sprite
Tue May 26, 2020 7:06 am
Forum: General Discussion
Topic: Recommended OS
Replies: 1
Views: 150

Re: Recommended OS

ESP-IDF (based on FreeRTOS) is the SDK we recommend, as we're actively developing it and the ESP series is it's main target.
by ESP_Sprite
Sun May 24, 2020 7:49 am
Forum: Hardware
Topic: UART Flow Control
Replies: 7
Views: 1056

Re: UART Flow Control

Support like this is entirely on a as-needed basis, imo. I can write an entire book about hardware handshaking and then find out the other guy only needs a little bit of it (or none at all as they might have an X/Y problem), but I'd rather just help people solve the problem at hand. If you need to k...
by ESP_Sprite
Sat May 23, 2020 12:52 pm
Forum: ESP32 IDF
Topic: Measure the duration of the wifi ISR
Replies: 1
Views: 98

Re: Measure the duration of the wifi ISR

What is your purpose of measuring this? The 'WiFi ISR' is pretty much wrapped up in the WiFi driver itself, so it's probably not that useful to know...
by ESP_Sprite
Sat May 23, 2020 12:50 pm
Forum: Hardware
Topic: UART Flow Control
Replies: 7
Views: 1056

Re: UART Flow Control

You could also, y'know, ask your own question related to this instead of hoping to glance information from the failures of others?
by ESP_Sprite
Fri May 22, 2020 7:33 am
Forum: Hardware
Topic: ESP32D2WD SPI and JTAG pin with MUX
Replies: 4
Views: 212

Re: ESP32D2WD SPI and JTAG pin with MUX

Mod note: Merged two duplicate topics.

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