Search found 8 matches

by NiclasH
Sun Jun 07, 2020 11:59 pm
Forum: General Discussion
Topic: Invalid I2S example, but still compiles, but not...
Replies: 4
Views: 999

Re: Invalid I2S example, but still compiles, but not...

The sarcasm and derogatory attitude are not appreciated. Claiming C and C++ are not related any more than C and COBOL is outright offensive (and `extern "C" {}` doesn't save the day, but code would need to be placed into .c file). On top of that, explicitly not supporting C++ can not possibly be a "...
by NiclasH
Sun Jun 07, 2020 8:50 am
Forum: General Discussion
Topic: Invalid I2S example, but still compiles, but not...
Replies: 4
Views: 999

Invalid I2S example, but still compiles, but not...

The examples/peripherals/i2s/main/i2s_example_main.c contains invalid code; i2s_config_t i2s_config = { .mode = I2S_MODE_MASTER | I2S_MODE_TX, // Only TX .sample_rate = SAMPLE_RATE, .bits_per_sample = 16, .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT, //2-channels .communication_format = I2S_COMM_FOR...
by NiclasH
Sun May 17, 2020 7:07 am
Forum: General Discussion
Topic: What would you like to see in The Next Chip?
Replies: 392
Views: 197188

Re: What would you like to see in The Next Chip?

Long thread, and can't say I have read every suggestion, but mine are about fixing the "broken" parts in ESP32, before adding "more stuff" (possibly with the exception of more usable GPIOs on the physical chip) * Interrupt latency is quite poor. I don't understand why, but if 8bit microcontrollers c...
by NiclasH
Sat May 02, 2020 6:05 am
Forum: General Discussion
Topic: [IDFGH-2892] Endless SPI w/ DMA receive problem
Replies: 5
Views: 3605

Re: [IDFGH-2892] Endless SPI w/ DMA receive problem

Nope. The compiler/linking still affects the delays that happens inside the silicon somewhere... We have decided to abandon the hardware solution at hand and go with something else, where we don't depend on reliable CPU execution cycles.
by NiclasH
Sun Apr 26, 2020 5:02 am
Forum: General Discussion
Topic: [IDFGH-2892] Endless SPI w/ DMA receive problem
Replies: 5
Views: 3605

Re: [IDFGH-2892] Endless SPI w/ DMA receive problem

Second problem found; It was a ESP_LOGI inside the portDISABLE_INTERRUPTS block. Newer esp-idf/ detected that and pointed me in the right direction. Original problem; I can live with my work around.
by NiclasH
Wed Apr 22, 2020 10:44 am
Forum: General Discussion
Topic: [IDFGH-2892] Endless SPI w/ DMA receive problem
Replies: 5
Views: 3605

Re: [IDFGH-2892] Endless SPI w/ DMA receive problem

Thanks for taking an interest. Between my post and "me giving up", I gave up for a different reason... More about that below. First answer your questions; SCLK is generated by the SPI module. CS is generated from MCPWM. MCPWM resolution is 4 clk cycles per SCLK cycle, so I can set the CS pulse exact...
by NiclasH
Mon Mar 16, 2020 2:18 am
Forum: Hardware
Topic: ESP32 Pico D4 Custom PCB not working
Replies: 8
Views: 5227

Re: ESP32 Pico D4 Custom PCB not working

I have had a similar problem before, and it was due to too much solder paste on the GND under the chip. Using a "checkered" pad resolved the problem. I.e. add solder mask on top of the pad so that you get 9 "islands" of solder paste, or even just make the solder paste layer into such pattern. A good...
by NiclasH
Sun Mar 15, 2020 1:01 pm
Forum: General Discussion
Topic: [IDFGH-2892] Endless SPI w/ DMA receive problem
Replies: 5
Views: 3605

[IDFGH-2892] Endless SPI w/ DMA receive problem

Hi, This issue is driving me bonkers. I am reading an ADC128S102 (A/D converter) in endless mode. So, I set up VSPI with a descriptor to point back to itself, syncing up a CS via MCPWM Timer1 (should not be needed, but primarily to get stable oscilloscope readings). The data that is sent out is very...

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