APPLICATION NOTE
AT07335: SAM4 TWI Slave Mode Driver
ASF PROGRAMMERS MANUAL
SAM4 TWI Slave Mode Driver
This driver provides access to the main features of the TWIS The TWIS
2
interconnects components on a unique two-wire bus in a manner similar to I C.
The TWIS is programmable as a slave with sequential or single-byte access. High
speed mode capability is also supported. This document does not provide any
information regarding SMBus usage.
●
Prerequisites
●
Module Overview
●
Examples
●
API Overview
●
Special Considerations
●
Extra Information
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Table of Contents
SAM4 TWI Slave Mode Driver ........................................................... 1
Software License ................................................................................ 4
1. Prerequisites ................................................................................. 5
2. Module Overview .......................................................................... 6
2.1.
2.2.
Functional Description .................................................................. 6
TWI Bus Topology ...................................................................... 6
3. Special Considerations ................................................................. 7
4. Extra Information .......................................................................... 8
4.1.
Terms and Definitions .................................................................. 8
5. Examples ...................................................................................... 9
6. API Overview .............................................................................. 10
6.1.
6.2.
6.3.
6.4.
6.5.
Variable and Type Definitions ...................................................... 10
6.1.1.
Type twis_callback_t ..................................................... 10
6.1.2.
Type twis_error_callback_t ............................................. 10
6.1.3.
Type twis_interrupt_source_t .......................................... 10
6.1.4.
Type twis_rx_callback_t ................................................ 10
6.1.5.
Type twis_stop_callback_t ............................................. 10
6.1.6.
Type twis_tx_callback_t ................................................. 10
Structure Definitions ................................................................... 10
6.2.1.
Struct twis_callback ....................................................... 10
6.2.2.
Struct twis_config .......................................................... 11
6.2.3.
Struct twis_dev_inst ....................................................... 11
Macro Definitions ...................................................................... 12
6.3.1.
Macro TWIS_WAIT_TIMEOUT ....................................... 12
Function Definitions ................................................................... 12
6.4.1.
Function twis_clear_status() ........................................... 12
6.4.2.
Function twis_disable() .................................................. 12
6.4.3.
Function twis_disable_interrupt() ..................................... 12
6.4.4.
Function twis_enable() .................................................. 13
6.4.5.
Function twis_enable_interrupt() ...................................... 13
6.4.6.
Function twis_get_config_defaults() ................................. 13
6.4.7.
Function twis_get_interrupt_mask() .................................. 14
6.4.8.
Function twis_get_smbus_pec() ...................................... 14
6.4.9.
Function twis_get_smbus_transfer_nb() ............................ 15
6.4.10. Function twis_get_status() ............................................. 15
6.4.11. Function twis_init() ....................................................... 15
6.4.12. Function twis_read() ..................................................... 16
6.4.13. Function twis_send_data_ack() ....................................... 16
6.4.14. Function twis_send_data_nack() ..................................... 17
6.4.15. Function twis_set_callback() ........................................... 17
6.4.16. Function twis_set_smbus_transfer_nb() ............................ 17
6.4.17. Function twis_write() ..................................................... 18
Enumeration Definitions .............................................................. 18
6.5.1.
Enum twis_interrupt_source ........................................... 18
7. TWI Slave Example .................................................................... 20
7.1.
7.2.
7.3.
7.4.
7.5.
Introduction ..............................................................................
Requirements ...........................................................................
Main Files ................................................................................
Description of the Example .........................................................
Compilation Info ........................................................................
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20
20
20
20
20
8. Quickstart guide for SAM TWIS driver ....................................... 21
8.1.
8.2.
Basic Use Case ........................................................................
8.1.1.
Prerequisites ................................................................
Setup Steps .............................................................................
8.2.1.
Example Code ..............................................................
21
21
21
21
Index ................................................................................................. 22
Document Revision History .............................................................. 23
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Software License
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials provided with the distribution.
3. The name of Atmel may not be used to endorse or promote products derived from this software without specific
prior written permission.
4. This software may only be redistributed and used in connection with an Atmel microcontroller product.
THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN
NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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1.
Prerequisites
There are no prerequisites for this module.
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2.
Module Overview
The outline of this section is as follows:
2.1
●
Functional Description
●
TWI Bus Topology
Functional Description
2
Driver for the TWIS (Two-Wire aka I C Slave Interface). This driver provides access to the main features of the
TWIS controller. The two wire interface connects components on a two-wire bus, each having a unique ID. The
TWI modules is programmable as a slave with sequential or single-byte access. High speed mode capability is also
supported.
The TWI bus provides a simple, but efficient, method of interconnecting multiple master and slave devices. An
arbitration mechanism is provided for resolving bus ownership between masters, as only one master device may
own the bus at any given time. The arbitration mechanism relies on the wired-AND connections to avoid bus drivers
short-circuiting.
2.2
TWI Bus Topology
Figure 2-1: I2C Bus Topology on page 6. The pull-up resistors (Rs) will provide a high level on the bus lines
when none of the TWI devices are driving the bus. These are optional, and can be replaced with a constant current
source.
Figure 2-1. I2C Bus Topology
VCC
RP
RP
I2C DEVICE
#1
I2C DEVICE
#2
I2C DEVICE
#N
RS
RS
RS
RS
RS
RS
SDA
SCL
Note: RS is optional
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3.
Special Considerations
NONE.
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4.
Extra Information
4.1
Terms and Definitions
Term
Definition
Standard speed
Original 100kHz clock
Fast Mode plus
1MHz clock
High spead mode
3.4MHz clock
Ultra Fast mode
5MHz clock
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5.
Examples
●
Quickstart guide for SAM TWIS driver
●
TWI Slave Example
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6.
API Overview
6.1
Variable and Type Definitions
6.1.1
Type twis_callback_t
typedef struct twis_callback twis_callback_t
6.1.2
Type twis_error_callback_t
typedef void(* twis_error_callback_t )(void)
6.1.3
Type twis_interrupt_source_t
typedef enum twis_interrupt_source twis_interrupt_source_t
TWIS interrupt source type.
6.1.4
Type twis_rx_callback_t
typedef void(* twis_rx_callback_t )(uint8_t)
6.1.5
Type twis_stop_callback_t
typedef void(* twis_stop_callback_t )(void)
6.1.6
Type twis_tx_callback_t
typedef uint8_t(* twis_tx_callback_t )(void)
6.2
Structure Definitions
6.2.1
Struct twis_callback
Table 6-1. Members
Type
Name
Description
twis_error_callback_t
error
Routine to handle bus error
twis_rx_callback_t
rx
Routine to receive data from TWI
master
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6.2.2
Type
Name
Description
twis_stop_callback_t
stop
Routine to signal a TWI STOP
twis_tx_callback_t
tx
Routine to transmit data to TWI
master
Type
Name
Description
bool
ack_general_call
Acknowledge the general call
address
bool
ack_slave_addr
Acknowledge the specified slave
address
bool
ack_smbus_default_addr
Acknowledge the SMBus default
address
bool
ack_smbus_host_header
Acknowledge the SMBus host
header
uint32_t
chip
The desired address.
bool
enable_pec
Enable packet error checking
uint8_t
exp
Clock Prescaler
uint8_t
fs_dadrivel
Data Drive Strength Low in F/S
mode
uint8_t
fs_daslew
Data Slew Limit in F/S mode
uint8_t
fs_filter
Input Spike Filter Control in F/S
mode
uint8_t
hddat
Data Hold Cycles
uint8_t
hs_dadrivel
Data Drive Strength Low in HS
mode
uint8_t
hs_daslew
Data Slew Limit in HS mode
uint8_t
hs_filter
Input Spike Filter Control in HS
mode
bool
smbus
SMBUS mode
bool
stretch_clk_addr
Stretch clock on address match
bool
stretch_clk_data
Stretch clock on data byte
reception
bool
stretch_clk_hr
Stretch clock if RHR is full or THR
is empty
uint8_t
sudat
Data Setup Cycles
bool
ten_bit
Ten-bit addressing
uint8_t
tlows
SMBus Low:Sext Cycles
uint8_t
ttouts
SMBus TIMEOUT Cycles
Struct twis_config
Table 6-2. Members
6.2.3
Struct twis_dev_inst
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6.2.3.1
asfdoc_sam_twis_structure
Device instance structure for a TWI Slave driver instance. This structure should be initialized by the twis_init()
function to associate the instance with a particular hardware module of the device.
Table 6-3. Members
Type
Name
Description
Twis *
hw_dev
Base address of the TWIS module.
struct twis_config *
twis_cfg
Pointer to TWIS configuration
structure.
6.3
Macro Definitions
6.3.1
Macro TWIS_WAIT_TIMEOUT
#define TWIS_WAIT_TIMEOUT
6.4
Function Definitions
6.4.1
Function twis_clear_status()
Clear the current status of the TWIS.
void twis_clear_status(
struct twis_dev_inst *const dev_inst,
uint32_t clear_status)
Table 6-4. Parameters
6.4.2
Data direction
Parameter name
Description
[out]
dev_inst
Device structure pointer
[in]
clear_status
The TWIS status to be clear
Function twis_disable()
Disable TWIS Module.
void twis_disable(
struct twis_dev_inst *const dev_inst)
Table 6-5. Parameters
6.4.3
Data direction
Parameter name
Description
[in]
dev_inst
Device structure pointer
Function twis_disable_interrupt()
Disable the TWIS interrupts.
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void twis_disable_interrupt(
struct twis_dev_inst *const dev_inst,
twis_interrupt_source_t interrupt_source)
Table 6-6. Parameters
6.4.4
Data direction
Parameter name
Description
[in]
dev_inst
Device structure pointer
[in]
interrupt_source
The TWIS interrupt to be disabled
Function twis_enable()
Enable TWIS Module.
void twis_enable(
struct twis_dev_inst *const dev_inst)
Table 6-7. Parameters
6.4.5
Data direction
Parameter name
Description
[in]
dev_inst
Device structure pointer
Function twis_enable_interrupt()
Enable the TWIS interrupts.
void twis_enable_interrupt(
struct twis_dev_inst *const dev_inst,
twis_interrupt_source_t interrupt_source)
Table 6-8. Parameters
6.4.6
Data direction
Parameter name
Description
[in]
dev_inst
Device structure pointer
[in]
interrupt_source
The TWIS interrupt source to be
enabled
Function twis_get_config_defaults()
Get the TWIS master default configurations.
void twis_get_config_defaults(
struct twis_config *const cfg)
Use to initialize the configuration structure to known default values. This function should be called at the start of any
TWIS initiation.
The default configuration is as follows:
●
7-bit addressing
●
Self address is 0x50
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●
Normal mode
●
Do not stretch clock on data byte reception
●
Do not stretch clock on address match
●
Stretch clock if RHR is full or THR is empty
●
Do not acknowledge the general call address
●
Acknowledge the specified slave address
●
Disable packet error checking
●
Do not acknowledge the SMBus host header
●
Do not acknowledge the SMBus default address
●
0 data setup cycles in F/S mode and high speed mode
●
Zero-initialization for slew rate setting in F/S mode and high speed mode
●
Clock Prescaler is 0
●
0 SMBus TIMEOUT cycle
●
0 SMBus Low:Sext cycle
Table 6-9. Parameters
6.4.7
Data direction
Parameter name
Description
[out]
cfg
Pointer to configuration structure to
be initiated
Function twis_get_interrupt_mask()
Get the TWIS interrupt mask.
uint32_t twis_get_interrupt_mask(
struct twis_dev_inst *const dev_inst)
Table 6-10. Parameters
Returns
6.4.8
Data direction
Parameter name
Description
[in]
dev_inst
Device structure pointer
TWIS interrupt mask.
Function twis_get_smbus_pec()
Get the calculated PEC value. Only for SMBus mode.
uint8_t twis_get_smbus_pec(
struct twis_dev_inst *const dev_inst)
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Note
Only for SMBus mode
Table 6-11. Parameters
Data direction
Parameter name
Description
[in]
dev_inst
Device structure pointer
Returns
6.4.9
Calculated PEC value
Function twis_get_smbus_transfer_nb()
Get the progress of the transfer in SMBus mode.
uint8_t twis_get_smbus_transfer_nb(
struct twis_dev_inst *const dev_inst)
Note
Only for SMBus mode
Table 6-12. Parameters
Data direction
Parameter name
Description
[in]
dev_inst
Device structure pointer
Returns
6.4.10
The left number of data bytes in the transmission.
Function twis_get_status()
Information about the current status of the TWIS.
uint32_t twis_get_status(
struct twis_dev_inst *const dev_inst)
Table 6-13. Parameters
Returns
6.4.11
Data direction
Parameter name
Description
[in]
dev_inst
Device structure pointer
TWI Status.
Function twis_init()
Initialize the TWI Slave Module.
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enum status_code twis_init(
struct twis_dev_inst *const dev_inst,
Twis *const twis,
struct twis_config * config)
Table 6-14. Parameters
Data direction
Parameter name
Description
[in]
dev_inst
Device structure pointer
[in]
twis
Base address of the TWIS
[in]
config
Configuration for the TWIS
Returns
Status of module initialization.
Table 6-15. Return Values
6.4.12
Return value
Description
STATUS_OK
The data is written correctly
STATUS_ERR_DENIED
Initialization failed due to the module was enable
before.
STATUS_ERR_BUSY
Initialization failed due to the module is busy with
transfer.
Function twis_read()
Get the last byte data received from TWI bus.
enum status_code twis_read(
struct twis_dev_inst *const dev_inst,
uint8_t * data)
Table 6-16. Parameters
Returns
Data direction
Parameter name
Description
[in]
dev_inst
Device structure pointer
[out]
data
The read data
Status of write operation.
Table 6-17. Return Values
6.4.13
Return value
Description
STATUS_OK
The data is read correctly
STATUS_ERR_TIMEOUT
The read operation aborted due to timeout
Function twis_send_data_ack()
Enable ACK transfer in Slave Receiver Mode.
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void twis_send_data_ack(
struct twis_dev_inst *const dev_inst)
Table 6-18. Parameters
6.4.14
Data direction
Parameter name
Description
[in]
dev_inst
Device structure pointer
Function twis_send_data_nack()
Enable NACK transfer in Slave Receiver Mode.
void twis_send_data_nack(
struct twis_dev_inst *const dev_inst)
Table 6-19. Parameters
6.4.15
Data direction
Parameter name
Description
[in]
dev_inst
Device structure pointer
Function twis_set_callback()
Set callback for TWIS.
void twis_set_callback(
struct twis_dev_inst *const dev_inst,
twis_interrupt_source_t source,
twis_callback_t callback,
uint8_t irq_level)
Note
Slave address match interrupt is enabled by default so that TWIS ISR can work appropriately.
Table 6-20. Parameters
6.4.16
Data direction
Parameter name
Description
[in]
dev_inst
Device structure pointer
[in]
source
Interrupt source
[in]
callback
Callback function pointer
[in]
irq_level
Interrupt level
Function twis_set_smbus_transfer_nb()
Set the total number of data bytes in the transmission. Only for SMBus mode.
void twis_set_smbus_transfer_nb(
struct twis_dev_inst *const dev_inst,
uint8_t nb,
bool increment)
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Note
Only for SMBus mode
Table 6-21. Parameters
6.4.17
Data direction
Parameter name
Description
[in]
dev_inst
Device structure pointer
[in]
nb
Total number of data bytes in the
transmission
[in]
increment
Count up per byte transferred if
true, otherwise count down.
Function twis_write()
Write one byte data to TWI bus.
enum status_code twis_write(
struct twis_dev_inst *const dev_inst,
uint8_t byte)
Table 6-22. Parameters
Returns
Data direction
Parameter name
Description
[in]
dev_inst
Device structure pointer
[in]
byte
The byte data to write
Status of write operation.
Table 6-23. Return Values
Return value
Description
STATUS_OK
The data is written correctly
STATUS_ERR_TIMEOUT
The write operation aborted due to timeout
6.5
Enumeration Definitions
6.5.1
Enum twis_interrupt_source
TWIS interrupt source type.
Table 6-24. Members
Enum value
Description
TWIS_INTERRUPT_RX_BUFFER_READY
TWIS_INTERRUPT_TX_BUFFER_READY
TWIS_INTERRUPT_TRANS_COMP
TWIS_INTERRUPT_UNDER_RUN
TWIS_INTERRUPT_OVER_RUN
TWIS_INTERRUPT_NAK_RECEIVED
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Enum value
Description
TWIS_INTERRUPT_SMBUS_TIMEOUT
TWIS_INTERRUPT_SMBUS_PEC_ERROR
TWIS_INTERRUPT_BUS_ERROR
TWIS_INTERRUPT_SLAVEADR_MATCH
TWIS_INTERRUPT_GENCALL_MATCH
TWIS_INTERRUPT_SMBUS_HHADR_MATCH
TWIS_INTERRUPT_SMBUS_DEFADR_MATCH
TWIS_INTERRUPT_STOP_RECEIVED
TWIS_INTERRUPT_RESTART_RECEIVED
TWIS_INTERRUPT_BYTE_TRANS_FINISHED
TWIS_INTERRUPT_ERRORS
TWIS_INTERRUPT_ALL
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7.
TWI Slave Example
7.1
Introduction
The application demonstrates how to use use the SAM TWIS peripheral.
7.2
Requirements
This package can be used with SAM4L boards.
In addition, another device will be needed to act as the TWI master. The twim_example can be used for that, in
which case a second kit supported by that project is needed.
7.3
7.4
1.
Connect TWD (SDA) for the two boards.
2.
Connect TWCK (SCL) for the two boards.
3.
Connect GND for the two boards.
4.
Add a pull up resistor on TWD and TWCK.
Main Files
●
twis.c SAM Two-Wire Slave Interface driver implementation
●
twis.h SAM Two-Wire Slave Interface driver definitions
●
twi_slave_example.c Example application
Description of the Example
After launching the program, the device will act as a simple TWI-enabled serial memory containing 50 bytes. This
enables this project to be used with the twim_example project as the master.
To write in the memory, the TWI master must address the device first, then send two bytes containing the memory
address to access. Additional bytes are treated as the data to write.
Reading is done in the same fashion, except that after receiving the memory address, the device will start
outputting data until a STOP condition is sent by the master. The default address for the TWI slave is fixed to
0x50. If the board has a TWI component with this address, you can change the define TARGET_ADDRESS
in conf_example.h of twim_example project, and then define SLAVE_ADDRESS in twi_slave_example.c of
twi_slave_example project.
7.5
Compilation Info
This software was written for the GNU GCC and IAR(™) EWARM. Other compilers may or may not work.
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8.
Quickstart guide for SAM TWIS driver
This is the quickstart guide for the SAM TWIS driver with step-by-step instructions on how to configure and use the
driver in a selection of use cases.
The use cases contain several code fragments. The code fragments in the steps for setup can be copied into a
custom initialization function, while the steps for usage can be copied into, e.g., the main application function.
8.1
Basic Use Case
The basic use case demonstrate how to initialize the TWIS module and configure it.
8.1.1
Prerequisites
●
System Clock Management (Sysclock).
8.2
Setup Steps
8.2.1
Example Code
Place the following at the start of your main function.
twis_callback_t slave_callbacks;
/* Initialize the SAM system */
sysclk_init();
/* Initialize the board */
board_init();
/* Initialize the console UART */
configure_console();
Then set the device as a TWI slave.
struct twis_config config;
twis_get_config_defaults(&config);
config.chip = SLAVE_ADDRESS;
Now initialise the TWI subsystem:
if (twis_init(&twis_device, BOARD_BASE_TWI_SLAVE, &config) == STATUS_OK) {
Set up the callback functions to handle reception, transmission, STOP condition and errors. In the end, enable the
slave address match interrupt:
/* Set pointer to user specific application routines */
slave_callbacks.rx = &twis_slave_rx;
slave_callbacks.tx = &twis_slave_tx;
slave_callbacks.stop = &twis_slave_stop;
slave_callbacks.error = &twis_slave_error;
twis_set_callback(&twis_device, TWIS_INTERRUPT_SLAVEADR_MATCH,
slave_callbacks, 1);
/* Enable the TWIS module */
twis_enable(&twis_device);
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Index
E
Enumeration Definitions
twis_interrupt_source, 18
F
Function Definitions
twis_clear_status, 12
twis_disable, 12
twis_disable_interrupt, 12
twis_enable, 13
twis_enable_interrupt, 13
twis_get_config_defaults, 13
twis_get_interrupt_mask, 14
twis_get_smbus_pec, 14
twis_get_smbus_transfer_nb, 15
twis_get_status, 15
twis_init, 15
twis_read, 16
twis_send_data_ack, 16
twis_send_data_nack, 17
twis_set_callback, 17
twis_set_smbus_transfer_nb, 17
twis_write, 18
M
Macro Definitions
TWIS_WAIT_TIMEOUT, 12
S
Structure Definitions
twis_callback, 10
twis_config, 11
twis_dev_inst, 11
T
Type Definitions
twis_callback_t, 10
twis_error_callback_t, 10
twis_interrupt_source_t, 10
twis_rx_callback_t, 10
twis_stop_callback_t, 10
twis_tx_callback_t, 10
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Document Revision History
Doc. Rev.
Date
Comments
42273A
05/2014
Initial document release
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