how to convert 2's complement ADXL345 data to nRF51 UART? needed help

RE: how to convert 2's complement ADXL345 data to nRF51 UART? needed help

mantap — Thu, 07 Dec 2017 10:20:16 GMT

thank you so much mr. sigurd, you are awesome.. long time to know how it's work this code.. what do you call this method, I wanna write your name in my journal project... thank so much, I appreciate your answer... so this is last program

RE: how to convert 2's complement ADXL345 data to nRF51 UART? needed help

Sigurd — Thu, 07 Dec 2017 09:19:59 GMT

Try something like this:

 char buffer [20];

 // Test data
 memset(&buffer, 0, sizeof(buffer));
int16_t reading_1 = 54;
int16_t reading_2 =42;
int16_t reading_3 = 32;
snprintf(buffer,20 ,"data: %d, %d, %d\n", reading_1, reading_2, reading_3);
 
 while (1) 
 {
     ble.waitForEvent();
     wait(0.1);
     accelerometer.getOutput(readings);
     uart1.printf("%i, %i, %i\n", (int16_t)readings[0], (int16_t)readings[1], (int16_t)readings[2]);
     
     memset(&buffer, 0, sizeof(buffer));
     snprintf(buffer,20 ,"data: %d, %d, %d\n", (int16_t)readings[0], (int16_t)readings[1], (int16_t)readings[2]);

 ble.updateCharacteristicValue(uartServicePtr->getRXCharacteristicHandle(), (uint8_t*)buffer,sizeof(buffer),false/*bytesRead*/);

}

RE: how to convert 2's complement ADXL345 data to nRF51 UART? needed help

mantap — Thu, 07 Dec 2017 01:48:10 GMT

still error bro, can you make it code simple.. write your example code that fix char buffer..

RE: how to convert 2's complement ADXL345 data to nRF51 UART? needed help

max — Wed, 06 Dec 2017 08:04:03 GMT

char tests[BUFFER_LEN] = {0}

snprintf((char *)tests,BUFFER_LEN,"%i, %i, %i\n", (int16_t)readings[0], (int16_t)readings[1], (int16_t)readings[2]);

send a tests array with your function as 20 B chunks

RE: how to convert 2's complement ADXL345 data to nRF51 UART? needed help

mantap — Wed, 06 Dec 2017 01:04:18 GMT

thank you for your answer, can you explained with the code please.. where is should I take fill a char buffer using sprint to code..

are take it to here?

 while (1) 
{
  ble.waitForEvent();
  wait(0.1);
  accelerometer.getOutput(readings);
  uart1.printf("%i, %i, %i\n", (int16_t)readings[0], (int16_t)readings[1], (int16_t)readings[2]);
  ble.updateCharacteristicValue(uartServicePtr->getRXCharacteristicHandle(), (const uint8_t*)readings[0], sizeof(readings),false);
  ble.updateCharacteristicValue(uartServicePtr->getRXCharacteristicHandle(), (const uint8_t*)readings[1], sizeof(readings),false);
  ble.updateCharacteristicValue(uartServicePtr->getRXCharacteristicHandle(), (const uint8_t*)readings[2], sizeof(readings),false);
}

because send over BLE should have method to change 2's complement ADXL345 (16 bit) to nrf51 (10 bit) that change that complement to string of array. I still confuse

RE: how to convert 2's complement ADXL345 data to nRF51 UART? needed help

max — Tue, 05 Dec 2017 09:06:12 GMT

You can fill a char* buffer using sprintf(), then send this buffer via nus