PixArt Optical Finger Navigation, OFN, demo program for A350 sensor with library. Alternative porting style in C++. Initial release v1.0.
Dependencies: Pixart_OFN_A
Fork of OFN_A350_Demo by
Diff: commHeaders/I2CcommFunctions.h
- Revision:
- 2:4c248212e354
- Parent:
- 1:67d6484416a6
diff -r 67d6484416a6 -r 4c248212e354 commHeaders/I2CcommFunctions.h --- a/commHeaders/I2CcommFunctions.h Tue Oct 30 21:14:15 2018 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,102 +0,0 @@ -#define I2Cmode //Used to check if the sensor is in I2C mode or SPI mode. -#define I2C_Slave_ID 0x57 //Slave ID is 0x57 only if p22 and p23 are both HIGH. - -//========================================================================= -//Communication pinouts for serial COM port, I2C, and interrupts -//========================================================================= -static Serial pc(USBTX, USBRX); //PC comm -static I2C i2c(p26, p27); //SDA, SCL -static DigitalOut cs(p22); //CS pin for selecting slave address -static DigitalOut MOSI(p23); //MOSI pin for selecting slave address -static DigitalOut shutdown(p20); //Shutdown pin -static DigitalOut IO_sel(p19); //IO interface selection pin (I2C and SPI) - - -//========================================================================= -//Variables and arrays used for communications and data storage -//========================================================================= -int8_t deltaX, deltaY; //Stores the value of one individual motion report. -int totalX, totalY = 0; //Stores the total deltaX and deltaY moved during runtime. - - -//========================================================================= -//Functions used to communicate with the sensor and grab/print data -//========================================================================= -uint8_t readRegister(uint8_t addr); -//This function takes an 8-bit address in the form 0x00 and returns an 8-bit value in the form 0x00. - -void writeRegister(uint8_t addr, uint8_t data); -//This function takes an 8-bit address and 8-bit data. Writes the given data to the given address. - -void load(const uint8_t array[][2], uint8_t arraySize); -//Takes an array of registers/data (found in registerArrays.h) and their size and writes in all the values. - -void grabData(void); -//Grabs the deltaX and deltaY information from the proper registers and formats it into the proper format. - -void printData(void); -//Prints the data out to a serial terminal. - - - - - -//========================================================================= -//Functions definitions -//========================================================================= -uint8_t readRegister(uint8_t addr) -{ - uint8_t data; - i2c.write((I2C_Slave_ID << 1), (const char*)&addr, 1, 0); //Send the address to the chip - i2c.read((I2C_Slave_ID << 1), (char*)&data, 1, 0); //Send the memory address where you want to store the read data - return(data); -} - - -//========================================================================= -void writeRegister(uint8_t addr, uint8_t data) -{ - char data_write[2]; //Create an array to store the address/data to pass them at the same time. - data_write[0] = addr; //Store the address in the first byte - data_write[1] = data; //Store the data in the second byte - i2c.write((I2C_Slave_ID << 1), data_write, 2, 0); //Send both over at once - - pc.printf("R:%2X, D:%2X\n\r", addr, readRegister(addr)); - //Uncomment this line for debugging. Prints every register write operation. -} - - -//========================================================================= -void load(const uint8_t array[][2], uint8_t arraySize) -{ - for(uint8_t q = 0; q < arraySize; q++) - { - writeRegister(array[q][0], array[q][1]); //Writes the given array of registers/data. - } -} - - -//========================================================================= -void grabData(void) -{ - deltaX = readRegister(0x03); //Grabs data from the proper registers. - deltaY = readRegister(0x04); - writeRegister(0x02, 0x00); //Clear EVENT and motion registers. -} - - -//========================================================================= -void printData(void) -{ - if((deltaX != 0) || (deltaY != 0)) //If there is deltaX or deltaY movement, print the data. - { - totalX += deltaX; - totalY += deltaY; - - pc.printf("deltaX: %d\t\t\tdeltaY: %d\n\r", deltaX, deltaY); //Prints each individual count of deltaX and deltaY. - pc.printf("X-axis Counts: %d\t\tY-axis Counts: %d\n\r", totalX, totalY); //Prints the total movement made during runtime. - } - - deltaX = 0; //Resets deltaX and Y values to zero, otherwise previous data is stored until overwritten. - deltaY = 0; -}