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About MGirão
since
11-13-2019
12-12-2019
MGirão
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11-29-2019
04:55 PM
Hi! I have been trying to work with an stm32 and a BMX055 in spi too and having some problems with the mag. But i would like to know if, and how, i can aquire access to that configuration in each sensor inside of the IMU as the picture shown before. I would appreciate the help, and sorry to bring this feed up again. Thank you!
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11-29-2019
12:58 PM
Hi! Ive been working with the BMX055 and been trying to implement with SPI and havent been sucssefull with the reading in the magnetometer. I received the information that using the Mag in I2C and trying SPI after, something should be done to change the pin. I honestly didnt understand and would like to know if somoene could help me. I leave my program for arduino below hoping that somoene could help me or know what the problem is, since i can only reado 0,0,0 from the mag in SPI. And since i've used it in I2C and everything worked fine, i think is probably something that im missing. Thank you very much for your attention and help! #include <SPI.h> int CSB1 = A1; int CSB2 = A2; int CSB3 = A3; unsigned int x_lsb = 0x02; unsigned int y_lsb = 0x04; unsigned int z_lsb = 0x06; const byte READ = 0b10000000; unsigned long elp_time = micros(); unsigned long read_time = micros(); void setup() { pinMode(CSB1, OUTPUT); pinMode(CSB2, OUTPUT); pinMode(CSB3, OUTPUT); Serial.begin(115200); SPI.begin(); SPI.setClockDivider(SPI_CLOCK_DIV64); SPI.setBitOrder(MSBFIRST); SPI.setDataMode(SPI_MODE0); digitalWrite(CSB1, HIGH); digitalWrite(CSB2, HIGH); digitalWrite(CSB3, HIGH); } int readAcc(unsigned int coor) { int aux; digitalWrite(CSB1, LOW); SPI.transfer(0x80 + coor); aux = SPI.transfer(0x00); digitalWrite(CSB1, HIGH); if (aux & 1) { aux = aux >> 4; digitalWrite(CSB1, LOW); SPI.transfer(0x80 + coor + 1); aux += (SPI.transfer(0x00) << 4); if (aux & 0x800) aux &= ~(0x800); digitalWrite(CSB1, HIGH); return aux; } else return 0; //delay(50); } int readGyr(unsigned int coor) { int lsb; int msb; int aux; digitalWrite(CSB2, LOW); SPI.transfer(0x80 + coor); lsb = SPI.transfer(0x00); digitalWrite(CSB2, HIGH); digitalWrite(CSB2, LOW); SPI.transfer(0x80 + coor + 1); msb = SPI.transfer(0x00); digitalWrite(CSB2, HIGH); aux = msb; if (lsb & 0x80) { lsb = ~lsb; lsb &= 0x7F; lsb++; } if (msb & 0x80) { msb = ~msb; msb &= 0x7F; msb++; } if (aux & 0x80) { aux = (msb << 8 )+ lsb; aux = ~aux; aux++; } else { aux = (msb << 8 )+ lsb; } return aux; } int readMag(unsigned int coor) { int aux; SPI.transfer(0xC0 + coor); aux = (SPI.transfer(0x00) >> 3); digitalWrite(CSB3, HIGH); digitalWrite(CSB3, LOW); SPI.transfer(0xC0 + coor + 1); aux += (SPI.transfer(0x00) << 5); digitalWrite(CSB3, HIGH); return aux; } void loop() { // if (micros()-read_time > 5){ // read_time = micros(); int x, y, z; x = readAcc(x_lsb); y = readAcc(y_lsb); z = readAcc(z_lsb); //Serial.print("Acc x:"); // Serial.print(x); // Serial.print(","); // Serial.print(y); // Serial.print(","); // Serial.println(z); x = readGyr(x_lsb); y = readGyr(y_lsb); z = readGyr(z_lsb); // Serial.print(x); // Serial.print(","); // Serial.print(y); // Serial.print(","); // Serial.println(z); x = readMag(x_lsb); y = readMag(y_lsb); z = readMag(z_lsb); Serial.print(x); Serial.print(","); Serial.print(y); Serial.print(","); Serial.println(z); }
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11-25-2019
04:41 PM
int readMag(unsigned int coor) { int aux; digitalWrite(CSB3, LOW); SPI.transfer(0xC0 + coor); aux = (SPI.transfer(0x00) >> 3); digitalWrite(CSB3, HIGH); digitalWrite(CSB3, LOW); SPI.transfer(0xC0 + coor + 1); aux += (SPI.transfer(0x00) << 5); digitalWrite(CSB3, HIGH); return aux; } void loop(){ ////////////////////////////////////////////////////////////////////////////MAG READ / PRINT x = readMag(x_lsb); y = readMag(y_lsb); z = readMag(z_lsb); Serial.print(x); Serial.print(","); Serial.print(y); Serial.print(","); Serial.println(z); } I have tried reading the mag like this and still no result. I did use I2C before but dont understand what you mean by releasing the pin for host control. I also used (0x80),instead of (0xC0) (and many other specified in datasheets), for the readings, as used in the acc and gyro and no result. Thank you again!
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11-13-2019
06:05 PM
Hi! I have been working with the BMX055 IMU module and i had a problem with reading the Magnetometer in SPI. I've working with an Arduino Mega and have tried I2C wich worked just fine but when i turn it to SPI,Accelarometerand Gyroscope i can read again, I can't just read the Mag. I have been following the datasheet but nothing quite work. I would like to ask if anyone have a tip or an example for arduino to help me. Below i leave the program i have for ACC and Gyro. Thank you. #include <SPI.h> int CSB1 = A2; int CSB3 = A0; int CSB2 = A1; unsigned int x_lsb = 0x02; unsigned int y_lsb = 0x04; unsigned int z_lsb = 0x06; const byte READ = 0b10000000; // SCP1000's read command void setup() { pinMode(CSB1, OUTPUT); pinMode(CSB2, OUTPUT); pinMode(CSB3, OUTPUT); Serial.begin(9600); SPI.begin(); SPI.setClockDivider(SPI_CLOCK_DIV64); SPI.setBitOrder(MSBFIRST); SPI.setDataMode(SPI_MODE0); digitalWrite(CSB1, HIGH); digitalWrite(CSB2, HIGH); digitalWrite(CSB3, HIGH); } int readAcc(unsigned int coor) { int aux; digitalWrite(CSB1, LOW); SPI.transfer(0x80 + coor); // prepare for read operation register coor where are LSB. aux = SPI.transfer(0x00); // reads LSB (4 bits) digitalWrite(CSB1, HIGH); //check if acceleration value has been updated since last it has been read out last if (aux & 1) { aux = aux >> 4; digitalWrite(CSB1, LOW); SPI.transfer(0x80 + coor + 1); // MSB is on the next register aux += (SPI.transfer(0x00) << 4); // sums MSB and LSB if (aux & 0x800) aux &= ~(0x800); digitalWrite(CSB1, HIGH); return aux; } else return 0; } int readGyr(unsigned int coor) { int lsb; int msb; int aux; digitalWrite(CSB2, LOW); SPI.transfer(0x80 + coor); lsb = SPI.transfer(0x00); digitalWrite(CSB2, HIGH); digitalWrite(CSB2, LOW); SPI.transfer(0x80 + coor + 1); msb = SPI.transfer(0x00); digitalWrite(CSB2, HIGH); aux = msb; if (lsb & 0x80) { lsb = ~lsb; lsb &= 0x7F; lsb++; } if (msb & 0x80) { msb = ~msb; msb &= 0x7F; msb++; } if (aux & 0x80) { aux = (msb << 8 ) + lsb; aux = ~aux; aux++; } else { aux = (msb << 8 )+ lsb; } // Serial.print(" msb:"); // Serial.println(msb); // Serial.print(" lsb:"); // Serial.println(lsb); return aux; } void loop() { int x, y, z; ////////////////////////////////////////////////////////////////////////ACC READ / PRINT x = readAcc(x_lsb); y = readAcc(y_lsb); z = readAcc(z_lsb); //Serial.print("Acc x:"); Serial.print(x); Serial.print(","); Serial.print(y); Serial.print(","); Serial.println(z); //////////////////////////////////////////////////////////////////////////GYRO READ / PRINT x = readGyr(x_lsb); y = readGyr(y_lsb); z = readGyr(z_lsb); //Serial.print("Gyr x:"); Serial.print(x); Serial.print(","); Serial.print(y); Serial.print(","); Serial.println(z); }
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