RE: how to send and receive data using i2c and spi protocol

Sigurd — Wed, 04 Oct 2017 13:14:06 GMT

Hi,

Please take a look at the MPU example and drivers on this Github page.

RE: how to send and receive data using i2c and spi protocol

ASHISH — Wed, 04 Oct 2017 13:10:24 GMT

Thanks for your reply!!!...i have already done the mpu 9250 programming with arduino. And i am famliiar with the mpu 9250 registor reading and writing. i am new to keil and i dont know how to code mpu 9250 using i2c protocol with nrf51422. i have sample arduino code which i want to share with you #include <Wire.h>

long accelX, accelY, accelZ; float gForceX, gForceY, gForceZ;

long gyroX, gyroY, gyroZ; float rotX, rotY, rotZ;

void setup() { Serial.begin(9600); Wire.begin(); setupMPU(); }

void loop() { recordAccelRegisters(); /* if(accelX<=0) { accelX=accelX+accelX; } if(accelY<=0){ accelY=accelY+accelY; } if(accelZ<=0){ accelZ=accelZ+accelZ; }*/ // recordGyroRegisters(); processAccelData(); printData(); delay(100); }

void setupMPU(){ Wire.beginTransmission(0b1101000); //This is the I2C address of the MPU (b1101000/b1101001 for AC0 low/high datasheet sec. 9.2) Wire.write(0x6B); //Accessing the register 6B - Power Management 1 (Sec. 4.28) Wire.write(0b00101000); //Setting SLEEP register to 0,cycle bit to 1 and disable temp (Required; see Note on p. 9) Wire.endTransmission();
/* Wire.write(0x6C); //Accessing the register 6c - Power Management 2 (Sec. 4.28) Wire.beginTransmission(0b1101000); Wire.write(0b00000111); //Setting STBY_XG,STBY_YG,STBY_ZG bits to 1 disable gyroscope (low power mode) (Required; see Note on p. 9) Wire.endTransmission();*/ Wire.beginTransmission(0b1101000); //I2C address of the MPU Wire.write(0x1B); //Accessing the register 1B - Gyroscope Configuration (Sec. 4.4) Wire.write(0x00000000); //Setting the gyro to full scale +/- 250deg./s Wire.endTransmission(); Wire.beginTransmission(0b1101000); //I2C address of the MPU Wire.write(0x1C); //Accessing the register 1C - Acccelerometer Configuration (Sec. 4.5) Wire.write(0b00000000); //Setting the accel to +/- 2g Wire.endTransmission(); }

void recordAccelRegisters() { Wire.beginTransmission(0b1101000); //I2C address of the MPU Wire.write(0x3B); //Starting register for Accel Readings Wire.endTransmission(); Wire.requestFrom(0b1101000,6); //Request Accel Registers (3B - 40) while(Wire.available() < 6); accelX = Wire.read()<<8|Wire.read(); //Store first two bytes into accelX accelY = Wire.read()<<8|Wire.read(); //Store middle two bytes into accelY accelZ = Wire.read()<<8|Wire.read(); //Store last two bytes into accelZ

}

void processAccelData(){

gForceX = accelX+32767 ; gForceY = accelY+32767; gForceZ = accelZ+32767; }

void recordGyroRegisters() { Wire.beginTransmission(0b1101000); //I2C address of the MPU Wire.write(0x43); //Starting register for Gyro Readings Wire.endTransmission(); Wire.requestFrom(0b1101000,6); //Request Gyro Registers (43 - 48) while(Wire.available() < 6); gyroX = Wire.read()<<8|Wire.read(); //Store first two bytes into accelX gyroY = Wire.read()<<8|Wire.read(); //Store middle two bytes into accelY gyroZ = Wire.read()<<8|Wire.read(); //Store last two bytes into accelZ processGyroData(); }

void processGyroData() { rotX = gyroX / 131.0; rotY = gyroY / 131.0; rotZ = gyroZ / 131.0; }

void printData() { Serial.print("Gyro (deg)"); Serial.print("X="); Serial.print(rotX); Serial.print("\t"); Serial.print("|Y="); Serial.print(rotY); Serial.print("\t"); Serial.print("|Z="); Serial.print(rotZ); //Serial.print("\t"); Serial.print("\n"); //Serial.print(" Accel (g)"); //Serial.print("\n");*/ Serial.print("X="); Serial.print(gForceX); //Serial.print(" "); Serial.print("\t"); Serial.print("|Y="); Serial.print(gForceY); Serial.print("\t"); Serial.print("|Z="); Serial.print(gForceZ ); Serial.print("\n"); delay(5000); }

i want to write code like this...could you send me the simple code like this using keil software ..As i have already gone through various github example but didnt understand that much... great help appreciated!!! cheers, Abhijeet Kapse

RE: how to send and receive data using i2c and spi protocol

Sigurd — Mon, 02 Oct 2017 08:41:36 GMT

Hi,

The nRF5x have flexible GPIO mapping, so all pins can be individually mapped to interface blocks for layout flexibility. You can therefore use any free GPIO pin you have on your board.