KeyPad - Matrix Keyboard
This class provides the matrix keyboard interface.
EC600SCN_LB, EC800NCN_LA, EC600NCN_LC, EC200UCN_LB, EC600UCN_LB, EC600MCN_LA, EC800MCN_LA, EC800MCN_GA, EG912NEN_AA series module is supported this feature.
Constructor
machine.KeyPad
class machine.KeyPad(row,col)
Parameter:
row- Integer type. Row number. It shall be greater than 0 and cannot exceed the maximum value supported by the module.col- Integer type. Column number. It shall be greater than 0. The value cannot exceed the maximum value supported by the module.
If you do not set the row and column value, the default value is 4X4.
| Module | Maximum Row | Maximum Column |
|---|---|---|
| EC800N/EC600N | 4 | 4 |
| EC600S | 5 | 5 |
| EC200U | 6(EC200UXXAA series only suprrort 4 Row,see Pin Correspondences) | 4 |
| EC600U | 6 | 6 |
| EC600M | 5 | 5 |
| EC800M | 5 | 5 |
| EG912N | 3 | 3 |
KeyPad Pin Correspondences:
When part of pins are used, you shall connect the keyboard and the pin according to row and column numbers in ascending order. For example, for EC600M, when a 2x2 matrix keyboard is used, the hardware will use 49, 51 and 48, 50 pins.
| Module | Pin |
|---|---|
| EC600M | Row number (output) and corresponding pins are as follows: Row number 0 – pin49 Row number 1 – pin51 Row number 2 – pin53 Row number 3 – pin55 Row number 4 – pin56 Column number (input) and corresponding pins are as follows: Column number 0 – pin48 Column number 1 – pin50 Column number 2 – pin52 Column number 3 – pin54 Column number 4 – pin57 |
| EC800M | Row number (output) and corresponding pins are as follows: Row number 0 – pin86 Row number 1 – pin76 Row number 2 – pin85 Row number 3 – pin82 Row number 4 – pin74 Column number (input) and corresponding pins are as follows: Column number 0 – pin87 Column number 1 – pin77 Column number 2 – pin84 Column number 3 – pin83 Column number 4 – pin75 |
| EG912N | Row number (output) and corresponding pins are as follows: Row number 1 – pin20 Row number 2 – pin16 Row number 3 – pin116 Column number (input) and corresponding pins are as follows: Column number 2 – pin105 Column number 3 – pin21 Column number 4 – pin1 |
| EC200U | Row number (output) and corresponding pins are as follows: Row number 0 – pin83 Row number 1 – pin84 Row number 2 – pin113 Row number 3 – pin114 Row number 4 – pin81(EC200UXXAA series not support) Row number 5 – pin82(EC200UXXAA series not support) Column number (input) and corresponding pins are as follows: Column number 0 – pin115 Column number 1 – pin78 Column number 2 – pin79 Column number 3 – pin80 |
| EC600U | Row number (output) and corresponding pins are as follows: Row number 0 – pin105 Row number 1 – pin106 Row number 2 – pin107 Row number 3 – pin108 Row number 4 – pin104 Row number 5 – pin103 Column number (input) and corresponding pins are as follows: Column number 0 – pin55 Column number 1 – pin129 Column number 2 – pin128 Column number 3 – pin127 Column number 4 – pin126 Column number 5 – pin125 |
Example:
>>> # Creates a keypad object
>>> import machine
>>> keypad=machine.KeyPad(2,3) # Sets a matrix keyboard with 2 rows and 3 columes
>>> keypad=machine.KeyPad() # Default parameter. The default setting is a matrix keyboard with 4 rows and 4 columns
>>> keypad=machine.KeyPad(2) # Sets the row value to 2. Default column Value. The default column value is 4. A matrix keyboard with 2 rows and 4 columes is initialized.
Methods
keypad.init
keypad.init()
This method initializes keypad settings.
Return Value:
0 - Successful execution
-1 - Failed execution
keypad.set_callback
keypad.set_callback(usrFun)
This method sets callback function. After the external keyboard button is connected to the module, this callback function will be triggered when the external keyboard button is pressed and released.
Parameter:
usrFun- Matrix keyboard callback function. Prototype:usrFun(result_list)Parameter of callback function:
result_list[0]: Key status (1 indicates the button is pressed and 0 indicates the button is released).result_list[1]: Row numberresult_list[2]: Column number
Return Value:
0 - Successful execution
-1 - Failed execution
keypad.deinit
keypad.deinit()
This method deinitializes to release initialized resources and callback function settings.
Return Value:
0 - Successful execution
-1 - Failed execution
Example:
import machine
import utime
is_loop = 1
keypad=machine.KeyPad()
keypad.init()
def userfun(l_list):
global is_loop
if l_list[0] != 1 :
is_loop = 0
print('will exit')
print(l_list)
keypad.set_callback(userfun)
loop_num = 0
while is_loop == 1 and loop_num < 10:
utime.sleep(5)
loop_num = loop_num +1
print(" running..... ",is_loop,loop_num)
keypad.deinit()
print('exit!')