Component: IO Expander (PCF8574) (Comms: System)
From Flowcode Help
Jump to navigationJump to searchAuthor | Matrix TSL |
Version | 1.0 |
Category | Comms: System |
Contents
IO Expander component
Provides 8 digital input/output pins arranged into an 8-bit port using a I2C bus connection. Up to eight expanders can be connected to the same I2C peripheral by means of three address pins. Supports the PCF8574 and PCF8574A devices allowing up to 16 expanders to be connected to the same I2C bus ( 8 x PCF8574 + 8 x PCF8574A ).
Detailed description
No detailed description exists yet for this component
Examples
No additional examples
Downloadable macro reference
![]() |
ReadPort |
Reads the value of the IO pins. | |
![]() |
Return |
![]() |
WritePort |
Writes a value to the IO pins. | |
![]() |
Value |
Value to write. Range 0-255 | |
![]() |
Return |
![]() |
Initialise |
![]() |
Return |
![]() |
Initialise |
Enables the I²C hardware and performs some initialization. Should be called at the start of the program or at least before any of the other I²C functions are called. | |
![]() |
Return |
![]() |
Initialise |
Startup the I2C bus ready for communications. | |
![]() |
Return |
![]() |
Start |
Outputs a start condition onto the I²C bus. | |
![]() |
Return |
![]() |
Initialise |
Enables the I²C hardware and performs some initialization. Should be called at the start of the program or at least before any of the other I²C functions are called. | |
![]() |
Return |
![]() |
GetInt |
Gets an integer from the LUT | |
![]() |
Index |
![]() |
Return |
![]() |
SetFloatBits |
Sets the size of a float LUT entry | |
![]() |
Bits |
![]() |
Return |
![]() |
AddInt |
Int to add to the int array | |
![]() |
Value |
Int to add to the int array | |
![]() |
Return |
![]() |
AddFloat |
Add a float to the floating point LUT | |
[[File:]] - | Value |
Floating point values | |
![]() |
Return |
![]() |
Initialise |
Sets up the GSM module. Returns 0 for OK, 255 for no reply and 254 for command fail. | |
![]() |
Return |
![]() |
SampleAccel |
Samples the accelerometer 0 = no new data, 1 = new data available | |
![]() |
Return |
![]() |
Left |
Rotates the robot left - waits for the angle to be traversed before returning | |
![]() |
Angle |
Angle to turn in degrees | |
![]() |
Return |
![]() |
LCDDrawPixel |
Allows a single pixel on the LCD to be set or cleared | |
![]() |
X |
X Pixel 0-127 | |
![]() |
Y |
Y Pixel 0-31 | |
![]() |
State |
0=White (Off), 1=Black (On) | |
![]() |
Return |
![]() |
ServoSetPosition |
Allows one of the servo positions to be assigned | |
![]() |
Channel |
Range 0-3 | |
![]() |
Position |
Range 0-255 | |
![]() |
Return |
![]() |
CardBitmap |
Displays a monochrome bitmap read from the card on the LCD | |
![]() |
X |
Range 0-127 | |
![]() |
Y |
Range 0-31 | |
![]() |
Filename |
![]() |
Return |
![]() |
CardOpen |
Attempts to open an existing file on the SD card 255=Error, 1=File not found, 0=Open OK | |
![]() |
Filename |
![]() |
Return |
![]() |
Forwards |
Drives the robot forwards - waits for the distance to be traversed before returning | |
![]() |
Distance |
Distance in mm | |
![]() |
Return |
![]() |
ReadBearing |
Reads the compass bearing based on the degrees clockwise from magnetic north. | |
[[File:]] - | Return |
![]() |
GetConsoleHandle |
Gets the handle to the console allowing data displaying on the panel etc. | |
[[File:]] - | Return |
![]() |
LCDDrawLine |
Allows a single pixel width line to be drawn on the LCD | |
![]() |
X1 |
X Pixel 0-127 | |
![]() |
Y1 |
Y Pixel 0-31 | |
![]() |
X2 |
X Pixel 0-127 | |
![]() |
Y2 |
Y Pixel 0-31 | |
![]() |
Return |
![]() |
ServoAutoMoveToPosition |
Allows one of the servo positions to move gradually to a new position | |
![]() |
Channel |
Range 0-3 | |
![]() |
Position |
Range 0-255 | |
![]() |
Return |
![]() |
ReadAllValue |
Reads a single value stored from the read all command Index dictates which sensor value to read | |
![]() |
Index |
0=SW, 1-8=IR, 9-10=Line, 11=Light, 12=Mic, 13-15=Accel | |
![]() |
Return |
![]() |
LCDBacklight |
Allows the LCD backlight brighntess to be adjusted | |
![]() |
Intensity |
Range 0-100, 0=Off, 1=Min Brightness, 100=Max Brightness | |
![]() |
Return |
![]() |
LCDDrawRect |
Allows a rectangle to be drawn on the LCD | |
![]() |
X1 |
X Pixel 0-127 | |
![]() |
Y1 |
Y Pixel 0-31 | |
![]() |
X2 |
X Pixel 0-127 | |
![]() |
Y2 |
Y Pixel 0-31 | |
![]() |
Return |
![]() |
ReadLine |
Reads one of the IR line sensors 0-1 0=Left, 1=Right | |
![]() |
index |
0=Left, 1=Right | |
![]() |
Return |
![]() |
ServoDisable |
Allows one of the servo outputs 0-3 to be disabled | |
![]() |
Channel |
Range 0-3 | |
![]() |
Return |
![]() |
ServoEnable |
Allows one of the servo outputs 0-3 to be enabled | |
![]() |
Channel |
Range 0-3 | |
![]() |
Return |
![]() |
CardReadByte |
Reads a byte from the currently open file. Starts at the beginning of the file and auto increments to the end | |
![]() |
Return |
![]() |
CardErase |
Attempts to delete an existing file on the SD card 255=Error, 1=File not found, 0=Delete OK | |
![]() |
Filename |
![]() |
Return |
![]() |
CardWriteByte |
Appends a byte to the end of the currently open file | |
![]() |
Data |
![]() |
Return |
![]() |
EncoderRead |
Reads one of the motor encoder counters. Approx 0.328296mm of travel per encoder unit. | |
![]() |
index |
0=Left, 1=Right | |
![]() |
Return |
![]() |
SetMotors |
Sets the motor speeds without feedback Range -100 to 100 | |
[[File:]] - | Left |
Range -100 to 100 | |
[[File:]] - | Right |
Range -100 to 100 | |
![]() |
Return |
![]() |
Backwards |
Drives the robot backwards - waits for the distance to be traversed before returning | |
![]() |
Distance |
Distance in mm | |
![]() |
Return |
![]() |
EncoderReset |
Resets the motor encoder counters | |
![]() |
Return |
![]() |
LCDVerbose |
Allows the LCD to automatically report the API commands as they get processed. Default - verbose on | |
![]() |
State |
0=Off 1=On | |
![]() |
Return |
![]() |
SetProp |
Allows the COM port property to be set from a parent component. | |
![]() |
PropName |
![]() |
PropVal |
![]() |
Return |
![]() |
CardInit |
Attempts to startup the SD card 255=No Card, 254=Init Fail, 0=Init OK | |
![]() |
Return |
![]() |
GetProp |
Allows the property filter for the COM port list to be copied to a parent component. | |
![]() |
PropName |
![]() |
Return |
![]() |
LCDClear |
Clears the LCD | |
![]() |
Return |