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/SPIcommFunctions.h
- Revision:
- 2:4c248212e354
- Parent:
- 1:67d6484416a6
--- a/commHeaders/SPIcommFunctions.h Tue Oct 30 21:14:15 2018 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,106 +0,0 @@ -#define SPImode //Used to check if the sensor is in I2C mode or SPI mode. - -//========================================================================= -//Communication pinouts for serial COM port, SPI, and interrupts -//========================================================================= -static Serial pc(USBTX, USBRX); //PC comm -static SPI spi(p23, p24, p25); //mosi, miso, sclk -static DigitalOut cs(p22); //chip select -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) -{ - cs = 0; //Set chip select low/active - addr = addr & 0x7F; //Set MSB to 0 to indicate read operation - spi.write(addr); //Write the given address - wait_us(5); - uint8_t data_read = spi.write(0x00); //Throw dummy byte after sending address to receieve data - wait_us(30); - cs = 1; //Set chip select back to high/inactive - return data_read; //Returns 8-bit data from register -} - - -//========================================================================= -void writeRegister(uint8_t addr, uint8_t data) -{ - cs = 0; //Set chip select low/active - addr = addr | 0x80; //Set MSB to 1 to indicate write operation - spi.write(addr); //Write the given address - spi.write(data); //Write the given data - cs = 1; //Set chip select back to high/inactive - wait_us(30); //Wait time between write commands. - - //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; -}