DALI Control Gear Software Stack - description

XC800 Family
AP08102
DALI Control Gear Software Stack
Application Note
V1.1, 2010-09
Microcontrollers
Edition 2010-09
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2010 Infineon Technologies AG
All Rights Reserved.
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AP08102
DALI Control Gear Software Stack
XC82x
Revision History: V1.1 2010-09
Previous Version(s): V1.0 2010-06
Page
Subjects (major changes since last revision)
12
Chapter 3.4.4 is updated.
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Application Note
3
V1.1, 2010-09
AP08102
DALI Control Gear Software Stack
Table of Contents
Table of Contents
1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
2.1
2.2
DALI Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Receiving DALI Forward Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Sending Backward Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
3.1
3.2
3.2.1
3.2.2
3.2.2.1
3.2.2.2
3.3
3.4
3.4.1
3.4.2
3.4.3
3.4.4
DALI Control Gear Software Stack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Software Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Hardware Abstraction Layer Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
GPIO Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Timer 0 and Timer 2 Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Timer 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Timer 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
DALI Protocol Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
DALI Commands Handler Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Process Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Fading Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
DALI Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Memory Banks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4
4.1
4.2
4.3
4.4
API Routines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Arc Power Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Program DALI Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status of Lighting Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Light On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
Conditional Compilation Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6
6.1
6.2
6.2.1
6.2.2
6.3
6.4
6.5
Preparing Software Stack for LED Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hardware Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hardware Abstraction Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ADC Initialisation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CCU6 Initialisation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Application Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compiler Options and Linker Address Allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Software Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8
Acronyms Abbreviations and Special Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
10
10.1
10.2
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Flow Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
DALI Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Application Note
4
13
13
13
13
13
15
15
16
16
16
17
17
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DALI Control Gear Software Stack
Overview
1
Overview
Digital Addressable Lighting Interface (DALI) is a communication protocol for lighting control in buildings. The
interface was first described in Annex E, IEC60929 standard for fluorescent lamp ballast. Subsequently, it was
updated to the new standard IEC-62386, to include other lighting devices, such as LED and HID for example. The
standard for control interface of electronic control gears was published in June 2009. The standard for lighting
control devices is scheduled to be published in 2012.
DALI requires only a pair of wires to form the bus for communication to all devices on a single DALI network. Each
piece of operating equipment with a DALI interface can be communicated with, over DALI, individually. Using a bidirectional data exchange, a DALI controller can query and set the status of each connected lighting device. As a
standalone system, DALI can be operated with a maximum of 64 devices. Alternatively, DALI can be used as a
subsystem via DALI gateways for connection to building management systems.
Grouped System : Brightness control within large open- plan office, lecture halls or conference
rooms . DALI can provide zoned or localised control of lighting. Control could be offered through
infra-red remote control or a software control with GUI support , or used together as an easy
configuration tool to group loads together. Offering flexibility in customised lighting.
DALI Control Device(s)
(e.g. Control Panel, Remote Controller
, software control with GUI support)
DALI Bus
DALI Control Gear
(e.g. Lamp)
DALI Control Gear
(e.g. Lamp)
Can connect up to 64
DALI Control Gear
Complex System : Multiple DALI systems can be connected together utilising gateways to building
management systems . Software programs offer more sophisticated programming functionality for
grouped systems , such as scenesetting , timeclock , and partition control .
Building
Management
System
Gateway
DALI Control Device(s)
(e.g. Control Panel, Remote Controller
, software control with GUI support)
Gateway
Gateway
Gateway
DALI
Systems
DALI
Systems
DALI
Systems
DALI Bus
DALI Control Gear
(e.g. Lamp)
DALI Control Gear
(e.g. Lamp)
Can connect up to 64
DALI Control Gear
Figure 1
DALI System Types
Application Note
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V1.1, 2010-09
AP08102
DALI Control Gear Software Stack
Overview
DALI Master / Control Device
DALI Slave / Control Gear
MCU/XC822
MCU/XC8xx
App
Controls
Figure 2
DALI
Control
DALI
Level
Shifter
DALI
Level
Shifter
DALI Bus
PFC
Control
DALI
Control
Ballast
Control
Lighting
Output
Block Diagram for DALI Control Device and Control Gear
This document describes the DALI Software Stack for Control Gear solution, created to provide an application
example for LED control. This solution is based on the published IEC standard and is implemented with the
Infineon XC82x microcontroller.
The following items are required for use with this application note:
•
1x XC82x Easy Kit
Figure 3
XC82x Easy Kit
Other application notes of interest are:
•
•
AP08104: Guide to using DALI LightNet tool
AP08105: DALI Demo using Touch Sense Control
Application Note
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AP08102
DALI Control Gear Software Stack
DALI Protocol
2
DALI Protocol
DALI uses the Manchester encoded unidirectional serial protocol with a transmission rate of 1200bps ± 10%.
LOGICAL “1”
LOGICAL “0”
Figure 4
Bi-phase levels: ‘Logical 1’, ‘Logical 0’
2.1
Receiving DALI Forward Frame
Forward frame is the command frame received from the DALI master. It consists of 19-bits.
START
BIT
STOP BITS
Y
A5
A4
A3
A2
A1
A0
S
D7
D6
D5
D4
D3
D2
D1
D0
- 1 start bit, logical ‘1’, bi-phase code
- 1 address byte, ‘YAAA AAAS’, bi-phase code
Y: short address(‘0’) or group/broadcast address (‘1’)
A: address bits
S: direct arc power level (‘0’) or command (‘1’)
- 1 data byte, ‘XXXX XXXX’, bi-phase code
- 2 stop bits, ‘1’, idle line
Figure 5
Forward Frame Format
2.2
Sending Backward Frame
The Backward frame is sent only after the reception of a query command or a write memory command. It consists
of 11-bits.
STAR T
BIT
STOP BITS
D7
D6
D5
D4
D3
D2
D1
D0
- 1 sta rt bit , lo g ica l ‘1 ’, bi-ph a se cod e
- 1 d ata byte, ‘XXXX XXXX’, bi-p ha se cod e
- 2 sto p bits, ‘1 ’, id le line
Figure 6
Backward Frame Format
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DALI Control Gear Software Stack
DALI Control Gear Software Stack
3
DALI Control Gear Software Stack
This chapter describes the DALI Software Stack implemented for XC82x / XC83x devices.
3.1
Software Structure
Figure 7 shows the interface of the different software modules in the XC82x / XC83x lighting application software.
It consists of peripheral modules, the DALI Software Stack, and an application layer.
The DALI Software Stack consists of the DALI protocol and commands handler.
Hardware
Abstraction Layer
DALI Software Stack
Main
LED Control
Inits All Modules
Application
DALI Slave Software
LED controls
LED status
Program DALI variables to Flash
DALI Commands Handler
Start
Timer 0
DALI address, and DALI command
DALI Protocol
1msec
Read DALI
variables
520usec
For RX
Timer0
(16-bit)
DALI response
417usec
For TX
Timer 2
Edge detected
Reload
timer
RX
frame
Interrupt
T2EX
TX
frame
GPIO
BootROM user routine
(Programming / Erasing)
CCU6 /
GPIO /
ADC
Flash
P1.0
P0.5
DALI
RX
DALI
TX
Figure 7
Software Structure for the XC82x / XC83x
3.2
Hardware Abstraction Layer Configuration
LED
Driver
The config.h file stores the configuration of the GPIO and timers. The file can be modified according to the
application requirements.
3.2.1
GPIO Module
The default GPIO settings for DALI receive and transmit are P1.0 and P0.5 respectively. For the DALI receive,
T2EX (Timer 2 External pin), must be mapped to these pins. Depending on the application and package used, the
GPIO for DALI interface can be re-configured to other port pins. Refer to Table 1 for the GPIO pins that have T2EX
as input function and can be used for DALI receive.
Application Note
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DALI Control Gear Software Stack
DALI Control Gear Software Stack
Table 1
DALI Receive GPIO pin selection
Package
GPIO can be used for DALI RX
TSSOP-28
P0.4, P0.6, P1.0, P2.0, P2.7, P3.2
DSO-24
P0.4, P0.6, P1.0, P2.0, P3.2
DSO-20
P0.4, P0.6, P1.0, P2.0
TSSOP-16
P0.4, P0.6, P1.0, P2.0
Default settings:
1. DALI Transmit is on P0.5
#define DALI_TX_PIN P0_5
#define READ_DALI_TX_PIN P0_5
2. DALI Receive is on P1.0
#define DALI_RX_DATAIN P1_DATAIN
#define READ_DALI_RX_PIN ACC_b0
#define T2EX_SEL 0x02
3.2.2
Timer 0 and Timer 2 Modules
The default settings for Timer 0 and Timer 2 are based on FPCLK = 24MHz. If a different peripheral clock frequency
is selected, the settings for Timer 0 and Timer 2 have to be changed accordingly.
3.2.2.1
Timer 0
The Timer 0 serves as a 1 msec tick. The main loop is run every 1 msec (see Figure 13). The Interrupt Service
Routine carries out the timing countdown required in the Software Stack.
Default settings:
Timer 0 = 0xD120, 1 msec tick
3.2.2.2
Timer 2
The Manchester encoding and decoding of the DALI frame is performed in the DALI Software Stack with the use
of the Timer 2 module. The Timer 2 external pin, T2EX, is connected to the DALI RX to detect the falling / rising
edge of the forward frame.
Default settings:
Timer 2 = 0xC4F0, 520 usec for DALI Reception.
Timer 2 = 0xD8F0, 417 usec for DALI Transmission.
3.3
DALI Protocol Module
The ‘T2_viTmr2()’ function handles the decoding and encoding of the DALI frames.
Application Note
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DALI Control Gear Software Stack
DALI Control Gear Software Stack
Peripherals Modules
T2EX interupt
DALI Protocol
Edge
Detected
Read DALI RX
and shift the bit in
the DALI
command bufers
All address and
command bits
received
Set command
ready flag.
DALI
Commands
Handler
GPIO
DALI RX
T2 overflow
interrupt
Figure 8
DALI Address
DALI Command
Timer
overflow
Read DALI RX pin
and set edge
trigger
Decoding DALI Forward Frame
Peripherals Modules
T2 overflow
interrupt
GPIO
DALI TX
D A LI Protocol
Software
Manchester
encoding
Timer
overflow
DALI
Response
All response bits
transmitted
D ALI
C omm ands
H andler
Set Response
transmitted flag.
Bi-phase data
Figure 9
Encoding DALI Backward Frame
3.4
DALI Commands Handler Module
The main purpose of this module is to process the DALI address and command data from the DALI protocol
module. This module contains application interface routines and DALI functions for fade control, arc power control,
and read / write memory.
3.4.1
Process Command
The address byte of the DALI command is used to distinguish between a normal and a special command. This
check is implemented in the ‘DALI_vProcess_cmd()’ function. Figure 10 shows the flow of this function.
Application Note
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DALI Control Gear Software Stack
DALI Control Gear Software Stack
DALI Process
Command
Check DALI
Address
Address valid ?
Address belong to
special command
No
Yes
Address byte
bit 1 = 1?
No
Yes
Yes
No
Standard
Commands
Direct arc
power control
Special
commands
Return
Figure 10
Process DALI command
3.4.2
Fading Control
According to the DALI standard there are 15 different fade times and fade rates that control dimming. The fade
control is executed every 1 msec during the fading process. It updates the current arc power and stops the fading
process once the target arc power is reached.
The fade time per step is calculated using the formula:
Fade time per step
=
Fade Time
Target A rc P ow er – C urrent A rc P ow er
To resolve the truncation error the formula is modified to:
Fade time per 2 steps =
3.4.3
Fade Time
(Target Arc Power – Current Arc Power) / 2
+
0.5
DALI Variables
There are 34 DALI variables defined in the standard (see Table 11). The data from these 34 variables is returned
to the DALI master, when requested through the query commands. 29 of the 34 variables can be updated by the
DALI master through the configuration and special commands.
Application Note
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DALI Control Gear Software Stack
DALI Control Gear Software Stack
3.4.4
Memory Banks
The DALI standard supports up to 256 memory banks, up to 256 bytes for each memory bank. Due to limited flash
size, the implementation can support only 2 memory banks; Bank 0 and Bank 1.
For a device with a flash size of 4K bytes:
•
•
Bank 0 is 32 bytes and with read-only access.
Bank 1 is 95 bytes and with read / write access.
For a device with a flash size of 8K bytes:
•
•
Bank 0 is 256 bytes and with read-only access.
Bank 1 is 95 bytes and with read / write access.
The default data of Memory Bank 0 is defined in the file called “DALI_memory_bank0.c“. The default data of
Memory Bank 1 is defined in the file called “DALI_Flash_Sect_default.c“.
Table 2
Memory Bank Address Allocation
Device
Flash Size
Memory Bank 0
Memory Bank 1 (Default)
XC82x / XC83x 4K Bytes
0x0EC0 to 0x0EDF (32 bytes)
0x0F20 to 0x0F7E (95 bytes)
XC83x
0x1E00 to 0x1EFF (256 bytes)
0x1F20 to 0x1F7E (95 bytes)
8K Bytes
At power-up, the device will retrieve the Memory Bank 1 data from the flash and place it into XRAM. Any changes
to the Memory Bank 1 data requested by the DALI Master, will be carried out in XRAM. The routine
Program_DALI_Variables() is to be called to copy the Memory Bank 1 data from the XRAM into the flash. This
could be done before the device goes into power down mode or in the power-loss situation.
Application Note
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DALI Control Gear Software Stack
API Routines
4
API Routines
The DALI Software Stack provides 4 API routines:
•
•
•
•
DALI_arc_power() - return the required arc power level.
PROGRAM_DALI_variables() - to program the DALI variables and Memory Bank 1 data to flash if they are
updated by the DALI master.
LIGHT_status() - to update the DALI Software Stack on the status of the lighting device.
LIGHT_on() - to indicate that the lighting device is turned on.
4.1
Arc Power Level
The DALI Software Stack provides a routine that the user application can call to get the requested arc power level,
DALI_arc_power(). If the return value is zero, the lamp/LED has to be turned off.
Table 3
Update arc power level to the Application layer
Routine
DALI_arc_power
Inputs
-
Return
8-bits data: 0, minimum arc power level - maximum arc power level
4.2
Program DALI Variables
This routine programs the updated DALI variables and Memory Bank 1 data, to the flash. If all the variables / data remain
unchanged, there will be no programming action.
Table 4
Program DALI variables routine
Routine
PROGRAM_DALI_variables()
Inputs
-
Return
-
Resources used
32 bytes of IRAM for buffering data to be programmed
Execution Time
14 msec - Flash programming done.
2.4 usec - Flash programming not done.
4.3
Status of Lighting Device
If the lighting device is faulty or disconnected, this routine is to be called.
Table 5
Status of Lamp / LED
Routine
LIGHT_status()
Inputs
0 - Lighting Device OK
1 - Lighting Device faulty or disconnected
Return
-
4.4
Light On
This routine will set bit 2 of the DALI status byte, indicating that the lighting device is powered on. The user
application needs to call this routine after the pre-heating and ignition process of the lighting device are complete.
Application Note
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DALI Control Gear Software Stack
Conditional Compilation Option
Table 6
Light On
Routine
LIGHT_on()
Inputs
-
Return
-
5
Conditional Compilation Option
Four conditional compilation preprocessor functions are defined.
•
•
•
•
XC83X_8K - Flash size is 8Kbytes and the Memory banks are in upper 4K.
SPECIAL_MODE_EN - DALI special commands (commands 258 to 270) are supported.
MEMORY_BANK_EN - Read Memory Map access commands supported (commands 197, 273, 274)
WRITE_MEMORY_EN - Write to Memory Map commands supported (commands 275)
Application Note
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DALI Control Gear Software Stack
Preparing Software Stack for LED Application
6
Preparing Software Stack for LED Application
This chapter describes an LED application example that uses the DALI Software Stack with the XC822 Easy Kit
board from Infineon.
6.1
Hardware Setup
This section describes the hardware setup for this LED example. The XC822 Easy Kit board has a built in boost
converter which is used to drive the LED. The PWM signal is generated using the CCU6 module and output
through Port 1.2 to control the brightness of the LED.
XC822 Easy Kit
D ALI
C ontrol D evice
Figure 11
D ALI BU S
XC 822
MC U
P1 .2
Boost
C onverter
C ircuit
P 2.0 /P2 .1
Overview of hardware setup
On the XC822 Easy Kit board, the jumper BC_EN is connected to enable the boost converter and the LED
hardware module is connected to VOUT connector as shown in Figure 12.
Connect the LED
module to VOUT
Connect the
jumper to BC _EN
Figure 12
Connecting LED and boost converter jumper
Table 7 shows the XC822 MCU pins usage in this LED example on the Easy Kit board.
Table 7
XC822 MCU Pins Assignment
Pin Number
Port Pin
1
P0.5
DALI Transmit
2
P0.6
SPD Input / Output,
3
P2.3
-
Application Note
Pin Functionality
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DALI Control Gear Software Stack
Preparing Software Stack for LED Application
Table 7
XC822 MCU Pins Assignment (cont’d)
Pin Number
Port Pin
4
P2.2
-
5
P2.1
ADC Channel 1, LED control voltage feedback
6
P2.0
ADC Channel 0, LED control current feedback
7
P1.0
DALI Receive
8
P1.2
CCU6 Channel 1 PWM output
9
VDDP
I/O Port Supply
10
VSSP / VSSC
11
VDDC
Core Supply Output
12
P0.0
-
13
P0.1
-
14
P0.2
-
15
P0.3
-
16
P0.4
-
6.2
Pin Functionality
I/O Port Ground / Core Supply Ground
Hardware Abstraction Layer
In the configuration file CONFIG.H, there are changes to the Timer 2 configuration, as shown in Table 8.
Table 8
Configuration of GPIO and Timers in CONFIG.H
Module
Description
Changes
Timer 0
Timer 0 overflow timing
No change
Timer 2
Timer 2 overflow timing
No change
Define wakeup from power
down mode timing
#define<SPACE>PWR_DOWN_WAKEUP_TIME<SPACE>0x0960
GPIO
6.2.1
Define DALI transmit and
DALI receive pins
No change
ADC Initialisation
Two ADC channels are used, Channel 0 and Channel 1. Channel 0 is used to measure the LED current by
measuring the analog voltage at AN0. Channel 1 is used to measure the LED voltage by using the ADC differential
mode 1.
ADC settings:
•
•
•
•
Conversion time = 0.83 usec
Resolution = 10Bit
Channel 0 setting
– Input pin is AN0, P2.0
– Reference is 1.2Volt + Vssp
Channel 1 setting
– Input pin is AN1, P2.1
– Reference is 1.2V + AN0
6.2.2
CCU6 Initialisation
CCU6 module is used to generate PWM output to control the brightness of the LED.
Application Note
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V1.1, 2010-09
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DALI Control Gear Software Stack
Preparing Software Stack for LED Application
•
•
•
Channel 1 is used and output the PWM signal using COUT61 pin.
PWM period is 66 usec
Timer12 resolution is 0.021 usec
6.3
Application Layer
In this LED example code, the following features are added:
•
•
Programming of the DALI variables when the VDDP falls below 3.6V. The PROGRAM_DALI_variables() routine
is called to program the DALI variables from RAM to flash.
Enter power-down mode when the LED is turned off and after programming the DALI variables is complete.
The LED control is executed every 5 msec. The current arc power level is read by calling the DALI_arc_power()
routine. This arc level together with the LED current feedback (using ADC channel 0) are input into the LED current
control software algorithm to change the duty cycle of the PWM output.
6.4
Compiler Options and Linker Address Allocation
For this LED example code, the compiler options XC83X_8K, SPECIAL_MODE_EN, MEMORY_BANK_EN and
WRITE_MEMORY_EN are not enabled. This is to fit into the 4K flash of the XC822 Easy Kit.
The address allocation for the DALI variables are defined in the linker file as shown in Table 9.
Table 9
Address Allocation in the Linker
Segments
Description
Address
DALI_FLASH_SECT_DEFAULT DALI variables default values
0x0F01 to 0x0F1C
DALI_PARA
0x0EE0 to 0x0EFF
6.5
DALI variables reset values
Software Package
Table 10 lists the source files in the software package.
Table 10
List of source files
Files
Description
Start_xc.a51
Start up code for XC82x device. This is part of the compiler package
Main.c
Main loop and user application code to control the LED. Refer to Figure 13.
DALI_main.c
DALI Software Stack main function loop, refer to Figure 14.
DALI.c
DALI software module initialisation and DALI command handling.
DALI_API.c
Contains all the API routines described in Chapter 4.
T01.c
Timer 0 module initialisation and 1 msec interrupt service routine
T2
Timer 2 module initialisation and the interrupt service routine that decode or
encode the DALI frame.
IO.c
GPIO module initialisation.
ADC.c
ADC module initialisation.
CC6.c
CCU6 module initialisation
PM.c
Power management module initialisation and power down mode entry function.
DALI_para.c
Defined the DALI parameter contents.
DALI_memory_bank0.c
Defined the memory bank 0 contents.
Application Note
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DALI Control Gear Software Stack
Summary
Table 10
List of source files (cont’d)
Files
Description
DALI_Flash_Sect_default.c Defined the memory bank 1 contents.
config.h
7
Configuration of GPIO and definitions of timer overflow periods used in timer0 and
timer2 modules.
Summary
The “DALI Control Gear Software Stack” solution has been developed in accordance with the IEC62386
standards. The description in this application note shows how the solution can be customised for an LED control
application. From this example, users will be able to customise the Software Stack to their own lighting application.
8
Acronyms Abbreviations and Special Terms
List of terms and abbreviations used throughout the document:
•
•
•
•
9
API
GPIO
MCU
T2EX
Application Programming Interface
General Purpose Input / Output
Microcontroller Unit
Timer 2 External Pin
References
[1]
IEC62386 Digital addressable lighting interface - Part 101: General requirements - System (Edition 1.0,
2009-06)
[2]
IEC62386 Digital addressable lighting interface - Part 102: General requirements - Control gear (Edition 1.0,
2009- 06)
[3]
XC82x User Manual version 1.0
[4]
XC82x Easy Kit Hardware Manual XC822-TSSOP16 Board, version 1.0
Application Note
18
V1.1, 2010-09
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DALI Control Gear Software Stack
Appendix
10
Appendix
10.1
Flow Charts
Figure 13 and Figure 14 show the flow of the main loop and the DALI Software Stack.
Main.c
Peripherals
Initialisation
Enable interrupts
1 msec tick
yes
D ALI Main
no
U ser code
(Application )
Figure 13
Software flow in main.c
DALI Main
DALI state
machine
Fade running
no
Power on
condition
yes
yes
Update light arc
power according
to the fade rate
Set light to power
on condition
no
Return
Figure 14
Software Flow in DALI_main.c
Application Note
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DALI Control Gear Software Stack
Appendix
10.2
DALI Variables
List of variables defined in the DALI standard are shown in Table 11.
Table 11
Declaration of DALI Variables
Variables
Actual level
Default values
Reset Values
Range of Validity
Memory
Power On level
254
0, min to max
1 Byte RAM
Power On Level
254
254
0 to 255
1 Byte Flash
System Failure Level
254
254
0 to 255
1 Byte Flash
Minimum Level
Physical min
Physical min
Physical min to max
1 Byte Flash
Maximum Level
254
254
MIN to 254
1 Byte Flash
7
7
1 to 15
1 Byte Flash
Fade Rate
Fade Time
0
0
0 to 15
1 Byte Flash
255
no change
0 to 63, 255
1 Byte Flash
Search Address
FF FF FFh
FF FF FFh
00 00 00h to FF FF FFh
3 Bytes RAM
Group 0 - 7
0000 0000b
0000 0000b
0 to 255
1 Byte Flash
Group 8 - 15
0000 0000b
0000 0000b
0 to 255
1 Byte Flash
Scene 0
255
255
0 to 255
1 Byte Flash
Scene 1
255
255
0 to 255
1 Byte Flash
Scene 2
255
255
0 to 255
1 Byte Flash
Scene 3
255
255
0 to 255
1 Byte Flash
Scene 4
255
255
0 to 255
1 Byte Flash
Scene 5
255
255
0 to 255
1 Byte Flash
Scene 6
255
255
0 to 255
1 Byte Flash
Scene 7
255
255
0 to 255
1 Byte Flash
Scene 8
255
255
0 to 255
1 Byte Flash
Scene 9
255
255
0 to 255
1 Byte Flash
Scene 10
255
255
0 to 255
1 Byte Flash
Scene 11
255
255
0 to 255
1 Byte Flash
Scene 12
255
255
0 to 255
1 Byte Flash
Scene 13
255
255
0 to 255
1 Byte Flash
Scene 14
255
255
0 to 255
1 Byte Flash
Scene 15
255
255
0 to 255
1 Bytes Flash
1XX0 XXXXb
0X10 0XXXb
0 to 255
1 Byte RAM
DTR
undefined
no change
0 to 255
1 Byte RAM
DTR1
undefined
no change
0 to 255
1 Byte RAM
DTR2
undefined
no change
0 to 255
1 Byte RAM
Short Address
Status
Application Note
20
V1.1, 2010-09
w w w . i n f i n e o n . c o m
Published by Infineon Technologies AG
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