XIAO nRF52840-Sense with PlatformIO | Seeed Studio Wiki

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XIAO nRF52840-Sense with PlatformIO | Seeed Studio Wiki

Seeed Studio XIAO nRF52840 with PlatformIO

https://wiki.seeedstudio.com/xiao_nrf52840_with_platform_io/

[JpEncausse]

Can you provide an exemple to use BLE on XIAO nRF52840-Sense with PlatformIO ?
It seems PlatformIO is not compatible with BLE libraries and/or there is some 3yo work around that seems no longer working.
And it also seems the board description changes and require lib_archive = no to allow debugging

[env:seeed_xiao_nrf52840_sense]
platform = https://github.com/Seeed-Studio/platform-seeedboards.git
board = seeed-xiao-afruitnrf52-nrf52840-sense
framework = arduino
lib_archive = no

[nfs0619]

Thank you for your feedback. We have received your message and are currently arranging for debugging. If you do not receive further updates, please feel free to reach out to our technical support at [email protected] for further assistance. Thank you for your support and understanding.

[Jasionf]

Hello,JpEncausse
Can you provide us with a picture of the error you're talking about so we can locate it？

[JpEncausse]

My question is related to this issue:
Seeed-Studio/platform-seeedboards#1 (comment)

As you can see I found a way to fix the first issue with

• lib_archive = no
• pre:fix_link.py
• -Wl,-wrap=realloc

It is mandatory to make it work on PlatformIO + Bluefruit library. (Without it won't compile, won't debug, have to set boot mode to upload a new version).

But I still have hard time to make it work with characteristic specific to my device
https://stackoverflow.com/questions/79584991/bluefruit-no-arduino-access-to-service-or-characteristic-of-nrf52840-devices

I think the problem is related to Bluefruit library that is faster but way too "low-level" compared to Arduino (ESP32) library. The thing is I chose nrf52840 because of BLE capabilities ...

[nfs0619]

Sorry for the late reply. We’re currently arranging to investigate and fix this issue. Once resolved, we’ll update the documentation accordingly. Thank you for your feedback and support!

[Jasionf]

#include <Arduino.h>
#include <bluefruit.h>

BLEDis bledis;
BLEHidAdafruit blehid;

bool hasKeyPressed = false;

void startAdv(void)
{
// Advertising packet
Bluefruit.Advertising.addFlags(BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE);
Bluefruit.Advertising.addTxPower();
Bluefruit.Advertising.addAppearance(BLE_APPEARANCE_HID_KEYBOARD);

// Include BLE HID service
Bluefruit.Advertising.addService(blehid);

// There is enough room for the dev name in the advertising packet
Bluefruit.Advertising.addName();

/* Start Advertising

• • Enable auto advertising if disconnected
• • Interval: fast mode = 20 ms, slow mode = 152.5 ms
• • Timeout for fast mode is 30 seconds
• • Start(timeout) with timeout = 0 will advertise forever (until connected)
• For recommended advertising interval
• https://developer.apple.com/library/content/qa/qa1931/_index.html
  */
  Bluefruit.Advertising.restartOnDisconnect(true);
  Bluefruit.Advertising.setInterval(32, 244); // in unit of 0.625 ms
  Bluefruit.Advertising.setFastTimeout(30); // number of seconds in fast mode
  Bluefruit.Advertising.start(0); // 0 = Don't stop advertising after n seconds
  }

void set_keyboard_led(uint16_t conn_handle, uint8_t led_bitmap)
{
(void) conn_handle;

// light up Red Led if any bits is set
if ( led_bitmap )
{
ledOn( LED_RED );
}
else
{
ledOff( LED_RED );
}
}

void setup()
{
Serial.begin(115200);
while ( !Serial ) delay(10); // for nrf52840 with native usb

Serial.println("Bluefruit52 HID Keyboard Example");
Serial.println("--------------------------------\n");

Serial.println();
Serial.println("Go to your phone's Bluetooth settings to pair your device");
Serial.println("then open an application that accepts keyboard input");

Serial.println();
Serial.println("Enter the character(s) to send:");
Serial.println();

Bluefruit.begin();
Bluefruit.setTxPower(4); // Check bluefruit.h for supported values

// Configure and Start Device Information Service
bledis.setManufacturer("Adafruit Industries");
bledis.setModel("Bluefruit Feather 52");
bledis.begin();

/* Start BLE HID

• Note: Apple requires BLE device must have min connection interval >= 20m
• ( The smaller the connection interval the faster we could send data).
• However for HID and MIDI device, Apple could accept min connection interval
• up to 11.25 ms. Therefore BLEHidAdafruit::begin() will try to set the min and max
• connection interval to 11.25 ms and 15 ms respectively for best performance.
  */
  blehid.begin();

// Set callback for set LED from central
blehid.setKeyboardLedCallback(set_keyboard_led);

/* Set connection interval (min, max) to your perferred value.

• Note: It is already set by BLEHidAdafruit::begin() to 11.25ms - 15ms
• min = 91.25=11.25 ms, max = 121.25= 15 ms
  /
  / Bluefruit.Periph.setConnInterval(9, 12); */

// Set up and start advertising
startAdv();
}

void loop()
{
// Only send KeyRelease if previously pressed to avoid sending
// multiple keyRelease reports (that consume memory and bandwidth)
if ( hasKeyPressed )
{
hasKeyPressed = false;
blehid.keyRelease();

// Delay a bit after a report
delay(5);

}

if (Serial.available())
{
char ch = (char) Serial.read();

// echo
Serial.write(ch); 

blehid.keyPress(ch);
hasKeyPressed = true;

// Delay a bit after a report
delay(5);

}
}

I'm using this one code routine, Bluefruit, and we need to add the folder path /Adafruit_nRFCrypto/src/cortex-m4/fpv4-sp-d16-hard to our platformio.ini file

build_flags =
-L${PROJECT_DIR}/Adafruit_nRFCrypto/src/cortex-m4/fpv4-sp-d16-hard/

This folder is in /.platformio/packages/framework-arduinoadafruitnrf52/libraries/, we find this Adafruit_nRFCrypto folder and add it to our project directory.