Echelon I/O Model Reference for Smart Transceivers and Neu Instrukcja Użytkownika Strona 35
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I/O Model Reference 25
Using Functions or Events
To determine whether an input value is new, you can use the io_in( ) function
with the input_is_new variable or you can use the io_update_occurs event with
the input_value variable. Which method you choose depends on the specific I/O
model and the specific task that the program is designed to perform.
The I/O event mechanism tends to be the simpler method, where the Neuron
scheduler decides when to perform the I/O functions. However, when you are
combining multiple events in a single block of logic, you might need to call the
io_in( ) function explicitly, combined with the input_is_new variable.
The two examples shown in
Table 10 demonstrate different ways to accomplish
the same goal.
Table 10. Comparing io_update_occurs and io_in()
io_update_occurs with input_value
IO_5 input pulsecount ioPulsecount;
when (io_update_occurs(ioPulsecount)) {
if (input_value > 2) {
. . .
}
}
io_in( ) with input_is_new
stimer delayTimer;
IO_5 input pulsecount ioPulsecount;
when (timer_expires(delayTimer)) {
. . .
if ((io_in(ioPulsecount) > 2) && input_is_new) {
. . .
}
}
Important: If you combine explicit calls to the io_in( ) function with when clauses
that contain I/O events, synchronization problems can result. For example, if a
when clause evaluates to TRUE near the end of an I/O sampling period, the
io_in( ) call might not be executed until the following period, and the value
obtained could be misleading.
when (io_update_occurs(ioPulsecount)) {
. . .
z = input_value; // don’t use io_in(ioPulsecount) here
. . .
}
- I/O Model Reference for Smart 1
- Transceivers and Neuron Chips 1
- Welcome 3
- Audience 3
- Related Documentation 3
- Mini FX User’s Guide 4
- Series 5000 Chip Data Book 4
- Table of Contents 5
- Introduction 11
- Overview 12
- Direct I/O Models 14
- Parallel I/O Models 14
- Serial I/O Models 15
- Overlaying I/O Objects 18
- I/O Timing Issues 22
- Information 24
- Multiplexing I/O Models 28
- General I/O Functions 28
- Neuron C Reference Guide 29
- I/O Events 31
- Neuron C Programmer’s Guide 31
- Using Functions or Events 35
- Timer/Counter I/O Models 38
- Output Models 39
- Bit Input/Output 42
- Bit Input Example 45
- Bit Output Example 45
- Byte Input/Output 45
- Byte Input Example 47
- Byte Output Example 48
- Leveldetect Input 48
- Nibble Input/Output 50
- Nibble Input Example 53
- Nibble Output Example 53
- Touch Input/Output 53
- Muxbus Input/Output 62
- Parallel Input/Output 65
- Master Program 71
- Slave Program 72
- Slave B Mode 73
- Token Passing 76
- Handshaking 76
- Transferring Data 76
- Resynchronization Procedure 77
- Using the IRQ Signal 80
- Bitshift Input/Output 86
- Bitshift Input Example 90
- Bitshift Output Example 90
- I2C Input/Output 90
- Magcard Bitstream Input 94
- Magcard Input 96
- Magtrack1 Input 99
- Programming Considerations 100
- Syntax 101
- Example 102
- Neurowire Input/Output 102
- Hardware Considerations 102
- Neurowire Master Mode 103
- Neurowire Slave Mode 104
- SCI (UART) Input/Output 108
- Serial Input/Output 113
- Serial Input Example 117
- Serial Output Example 117
- SPI Input/Output 117
- SPI Master 122
- SPI Master (Neurowire 122
- SPI Slave 123
- Wiegand Input 128
- Timer/Counter Input Models 133
- Dualslope Input 135
- Neuron C Resources 138
- Edgelog Input 139
- Infrared Input 144
- Ontime Input 148
- Period Input 151
- Pulsecount Input 155
- Quadrature Input 158
- Totalcount Input 161
- Timer/Counter Output Models 165
- Edgedivide Output 166
- Frequency Output 169
- Infrared Pattern Output 172
- Oneshot Output 175
- Pulsecount Output 178
- Pulsewidth Output 181
- Stretched Triac Output 184
- Triac Output 189
- Example 1 192
- Example 2 193
- Triggered Count Output 193
- Timer/Counter Periods and 197
- Resolution 197
- InputClock 199
- And so on 200
- Period = 201
- Frequency = 1 / 201
- 196 Index 206
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