Search found 47 matches
- Sun Jan 06, 2019 11:09 am
- Forum: General Discussion
- Topic: (solved) I2C device poses a challenge
- Replies: 18
- Views: 24270
Re: I2C device poses a challenge
What I don't understand is how to wait 20 microseconds directly before the first stop condition. You don't need to poll the GPIO that the SCL is on. If I understand things correctly, after the first stop condition (which is the P after the 20 microsecond delay in the above diagram,) the idea is to a...
- Sun Jan 06, 2019 10:18 am
- Forum: General Discussion
- Topic: create program from scratch without make
- Replies: 5
- Views: 5922
Re: create program from scratch without make
Take a look at this video: https://www.youtube.com/watch?v=-ttiPfmrehU At 4:08 the video describes how to configure where to look for header files, including those in components/bt/bluedroid/api/include. The file used to import the include path settings in the video is part of ESP32 Snippets and can...
- Fri Jan 04, 2019 4:13 pm
- Forum: General Discussion
- Topic: create program from scratch without make
- Replies: 5
- Views: 5922
- Wed Jan 02, 2019 5:58 pm
- Forum: Showcase
- Topic: [info] ESP-EYE DevKIT from Espressif spotted in the wild and i got one :)
- Replies: 13
- Views: 23601
Re: [info] ESP-EYE DevKIT from Espressif spotted in the wild and i got one :)
Interesting, very interesting indeed. There's some information about the board here too.
- Tue Jan 01, 2019 6:01 pm
- Forum: ESP-IDF
- Topic: Read ADC in interrupt?
- Replies: 2
- Views: 7921
Re: Read ADC in interrupt?
Do you mean if it's a good idea to invoke adc1_get_raw or adc2_get_raw in an interrupt routine? If so, I don't think it's a good idea as invoking these functions involves spinlocks which isn't a good idea in an interrupt routine. See here . In order to get good ADC readings multisampling is likely t...
- Tue Jan 01, 2019 4:46 pm
- Forum: ESP-IDF
- Topic: Check if SD is connected
- Replies: 1
- Views: 3356
Re: Check if SD is connected
And a Happy New Year to you too.
If the SD card reader has a CD (Card Detect) output it could be connected to an ESP32 GPIO to detect whether or not a card is present.
If the SD card reader has a CD (Card Detect) output it could be connected to an ESP32 GPIO to detect whether or not a card is present.
- Tue Jan 01, 2019 4:30 pm
- Forum: ESP-IDF
- Topic: Cannot declare array into the External PSRAM?
- Replies: 4
- Views: 7473
Re: Cannot declare array into the External PSRAM?
Does the file defining bigArray directly or indiectly include "sdkconfig.h"? If "sdkconfig.h" (which contains the define for CONFIG_SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY) is not directly or indirectly included then EXT_RAM_ATTR will be defined as the empty string here and an error message similar to ...
- Mon Dec 31, 2018 3:56 pm
- Forum: General Discussion
- Topic: Convert string IP address to integer
- Replies: 3
- Views: 8027
Re: Convert string IP address to integer
The capital "I" at the start of the message indicates that it's an information message rather than a warning,
- Mon Dec 31, 2018 12:25 pm
- Forum: General Discussion
- Topic: Convert string IP address to integer
- Replies: 3
- Views: 8027
Re: Convert string IP address to integer
for inet_addr add:
Code: Select all
#include "lwip/inet.h"
- Mon Dec 31, 2018 11:52 am
- Forum: General Discussion
- Topic: How best to convert uint8_t from uart_read_bytes to a char or something that can be added to cJSON object?
- Replies: 2
- Views: 7074
Re: How best to convert uint8_t from uart_read_bytes to a char or something that can be added to cJSON object?
It's not fully clear if the protocol is a binary protocol or plain text protocol. It appears to be a binary protocol. If so, try with one of the following implementations of ParseData to see if it works. void ParseData(uint8_t * data) { uint32_t val = (data[0] * 100) + (data[1] * 10) + data[2]; ESP_...