APPLICATION NOTE
AT07893: SAM4L Peripheral DMA Controller (PDCA)
ASF PROGRAMMERS MANUAL
SAM4L Peripheral DMA Controller (PDCA)
The Peripheral DMA Controller (PDCA) transfers data between on-chip peripheral
modules such as USART, SPI, and memories (those memories may be on or off
chip). Using the PDCA avoids CPU intervention for data transfers, improving the
performance of the microcontroller. The PDCA can transfer data from memory to a
peripheral or from a peripheral to memory.
The outline of this documentation is as follows:
●
Prerequisites
●
Module Overview
●
Special Considerations
●
Extra Information
●
Examples
●
API Overview
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Table of Contents
SAM4L Peripheral DMA Controller (PDCA) ....................................... 1
Software License ................................................................................ 4
1. Prerequisites ................................................................................. 5
2. Module Overview .......................................................................... 6
3. Special Considerations ................................................................. 7
4. Extra Information .......................................................................... 8
5. Examples ...................................................................................... 9
6. API Overview .............................................................................. 10
6.1.
6.2.
6.3.
6.4.
Variable and Type Definitions ...................................................... 10
6.1.1.
Type pdca_callback_t ................................................... 10
6.1.2.
Type pdca_channel_interrupt_mask_t .............................. 10
6.1.3.
Type pdca_channel_num_t ............................................ 10
Structure Definitions ................................................................... 10
6.2.1.
Struct pdca_channel_config_t .......................................... 10
Function Definitions ................................................................... 10
6.3.1.
Function pdca_channel_clear_error() ............................... 10
6.3.2.
Function pdca_channel_disable() .................................... 11
6.3.3.
Function pdca_channel_disable_interrupt() ........................ 11
6.3.4.
Function pdca_channel_enable() ..................................... 11
6.3.5.
Function pdca_channel_enable_interrupt() ........................ 11
6.3.6.
Function pdca_channel_get_handler() .............................. 12
6.3.7.
Function pdca_channel_get_interrupt_mask() .................... 12
6.3.8.
Function pdca_channel_is_enabled() ............................... 12
6.3.9.
Function pdca_channel_read_load_size() .......................... 13
6.3.10. Function pdca_channel_read_reload_size() ....................... 13
6.3.11. Function pdca_channel_set_callback() ............................. 13
6.3.12. Function pdca_channel_set_config() ................................ 14
6.3.13. Function pdca_channel_write_load() ................................ 14
6.3.14. Function pdca_channel_write_reload() ............................. 14
6.3.15. Function pdca_disable() ................................................ 15
6.3.16. Function pdca_enable() ................................................. 15
6.3.17. Function pdca_get_channel_status() ................................ 15
Enumeration Definitions .............................................................. 16
6.4.1.
Enum pdca_channel_status ........................................... 16
7. Extra Information for Peripheral DMA Controller Driver ............. 17
7.1.
7.2.
7.3.
7.4.
Acronyms ................................................................................
Dependencies ...........................................................................
Errata ......................................................................................
Module History .........................................................................
17
17
17
17
8. Examples for Peripheral DMA Controller ................................... 18
8.1.
Peripheral DMA Controller Example ..............................................
8.1.1.
Purpose ......................................................................
8.1.2.
Requirements ...............................................................
8.1.3.
Description ...................................................................
8.1.4.
Usage .........................................................................
18
18
18
18
18
9. Quickstart guide for SAM PDCA driver ...................................... 19
9.1.
Basic use case ......................................................................... 19
9.1.1.
Prerequisites ................................................................ 19
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9.2.
Setup steps .............................................................................. 19
9.2.1.
Example code .............................................................. 19
9.2.2.
Workflow ..................................................................... 19
Index ................................................................................................. 21
Document Revision History .............................................................. 22
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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 Peripheral DMA Controller (PDCA) transfers data between on-chip peripheral modules such as USART,
SPI, and memories (those memories may be on and off chip). Using the PDCA avoids CPU intervention for
data transfers, improving the performance of the microcontroller. The PDCA can transfer data from memory to a
peripheral or from a peripheral to memory. The PDCA consists of multiple DMA channels. Each channel has:
●
A Peripheral Select Register
●
A 32-bit memory pointer
●
A 16-bit transfer counter
●
A 32-bit memory pointer reload value
●
A 16-bit transfer counter reload value
The PDCA communicates with the peripheral modules over a set of handshake interfaces. The peripheral signals
the PDCA when it is ready to receive or transmit data. The PDCA acknowledges the request when the transmission
has started. When a transmit buffer is empty or a receive buffer is full, an optional interrupt request can be
generated.
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3.
Special Considerations
None.
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4.
Extra Information
For extra information, see Extra Information for Peripheral DMA Controller Driver. This includes:
●
Acronyms
●
Dependencies
●
Errata
●
Module History
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5.
Examples
For a list of examples related to this driver, see Examples for Peripheral DMA Controller.
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6.
API Overview
6.1
Variable and Type Definitions
6.1.1
Type pdca_callback_t
typedef void(* pdca_callback_t )(enum pdca_channel_status status)
PDCA callback type.
6.1.2
Type pdca_channel_interrupt_mask_t
typedef uint32_t pdca_channel_interrupt_mask_t
PDCA channel interrupt mask type.
6.1.3
Type pdca_channel_num_t
typedef uint8_t pdca_channel_num_t
PDCA channel number type.
6.2
Structure Definitions
6.2.1
Struct pdca_channel_config_t
PDCA channel configuration structure.
Table 6-1. Members
Type
Name
Description
void *
addr
Memory address.
bool
etrig
Enable/disable the transfer upon
event trigger.
uint32_t
pid
Select peripheral ID.
void *
r_addr
Next memory address.
uint32_t
r_size
Next transfer counter.
bool
ring
Ring buffer function.
uint32_t
size
Transfer counter.
uint32_t
transfer_size
Select the size of the transfer (in
bytes, half-words or words).
6.3
Function Definitions
6.3.1
Function pdca_channel_clear_error()
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Clear transfer error for the given channel.
void pdca_channel_clear_error(
pdca_channel_num_t pdca_ch_number)
Table 6-2. Parameters
6.3.2
Data direction
Parameter name
Description
[in]
pdca_ch_number
PDCA channel
Function pdca_channel_disable()
Disable the PDCA for the given channel.
void pdca_channel_disable(
pdca_channel_num_t pdca_ch_number)
Table 6-3. Parameters
6.3.3
Data direction
Parameter name
Description
[in]
pdca_ch_number
PDCA channel
Function pdca_channel_disable_interrupt()
Disable PDCA interrupt.
void pdca_channel_disable_interrupt(
pdca_channel_num_t pdca_ch_number,
const pdca_channel_interrupt_mask_t pdca_channel_interrupt_mask)
Table 6-4. Parameters
6.3.4
Data direction
Parameter name
Description
[in]
pdca_ch_number
PDCA channel
[in]
pdca_channel_interrupt_mask
Interrupts to be disabled
Function pdca_channel_enable()
Enable the PDCA for the given channel.
void pdca_channel_enable(
pdca_channel_num_t pdca_ch_number)
Table 6-5. Parameters
6.3.5
Data direction
Parameter name
Description
[in]
pdca_ch_number
PDCA channel
Function pdca_channel_enable_interrupt()
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Enable PDCA transfer error interrupt.
void pdca_channel_enable_interrupt(
pdca_channel_num_t pdca_ch_number,
const pdca_channel_interrupt_mask_t pdca_channel_interrupt_mask)
Table 6-6. Parameters
6.3.6
Data direction
Parameter name
Description
[in]
pdca_ch_number
PDCA channel
[in]
pdca_channel_interrupt_mask
Interrupts to be enabled
Function pdca_channel_get_handler()
Get the base address of the specified PDCA channel configuration registers.
PdcaChannel * pdca_channel_get_handler(
pdca_channel_num_t pdca_ch_number)
Table 6-7. Parameters
Data direction
Parameter name
Description
[in]
pdca_ch_number
PDCA channel (range 0 15)
Returns
6.3.7
The channel configuration registers base address.
Function pdca_channel_get_interrupt_mask()
Get PDCA interrupt mask.
pdca_channel_interrupt_mask_t pdca_channel_get_interrupt_mask(
pdca_channel_num_t pdca_ch_number)
Table 6-8. Parameters
6.3.8
Data direction
Parameter name
Description
[in]
pdca_ch_number
PDCA channel
Function pdca_channel_is_enabled()
Check if PDCA channel is enabled.
bool pdca_channel_is_enabled(
pdca_channel_num_t pdca_ch_number)
Table 6-9. Parameters
Data direction
Parameter name
Description
[in]
pdca_ch_number
PDCA channel number to query
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Table 6-10. Return Values
6.3.9
Return value
Description
true
PDCA channel is enabled
false
PDCA channel is disabled
Function pdca_channel_read_load_size()
Read PDCA channel load values from hardware.
uint32_t pdca_channel_read_load_size(
pdca_channel_num_t pdca_ch_number)
Each channel has a 16-bit Transfer Counter Register (TCR). This register must be written with the number
of transfers to be performed. The TCR register should contain the number of data items to be transferred
independently of the transfer size. The TCR can be read at any time during transfer to see the number of remaining
transfers.
Table 6-11. Parameters
Data direction
Parameter name
Description
[in]
pdca_ch_number
PDCA channel
Returns
Size of the data block to load.
Note
The size of a data item is held in the channel config structure. See pdca_channel_set_config and
Basic use case for more deatils.
6.3.10
Function pdca_channel_read_reload_size()
Read PDCA channel reload values from hardware.
uint32_t pdca_channel_read_reload_size(
pdca_channel_num_t pdca_ch_number)
Table 6-12. Parameters
Returns
6.3.11
Data direction
Parameter name
Description
[in]
pdca_ch_number
PDCA channel
Size of the data block to reload.
Function pdca_channel_set_callback()
Set a callback for the specified PDCA channel.
void pdca_channel_set_callback(
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pdca_channel_num_t pdca_ch_number,
pdca_callback_t callback,
uint8_t irq_line,
uint8_t irq_level,
const pdca_channel_interrupt_mask_t pdca_channel_interrupt_mask)
Table 6-13. Parameters
6.3.12
Data direction
Parameter name
Description
[in]
pdca_ch_number
PDCA channel number (range 0
15)
[in]
callback
callback function pointer
[in]
irq_line
interrupt line
[in]
irq_level
interrupt level
[in]
pdca_channel_interrupt_mask
Interrupts to be enabled
Function pdca_channel_set_config()
Configure the specified PDCA channel.
void pdca_channel_set_config(
pdca_channel_num_t pdca_ch_number,
const pdca_channel_config_t * cfg)
Table 6-14. Parameters
6.3.13
Data direction
Parameter name
Description
[in]
pdca_ch_number
PDCA channel (range 0 15)
[in]
cfg
Pointer to a PDCA channel
configuration structure
Function pdca_channel_write_load()
Write PDCA channel load values to hardware.
void pdca_channel_write_load(
pdca_channel_num_t pdca_ch_number,
volatile void * addr,
uint32_t size)
Table 6-15. Parameters
6.3.14
Data direction
Parameter name
Description
[in]
pdca_ch_number
PDCA channel (range 0 15)
[in]
addr
Address where data to load is
stored
[in]
size
Size of the data block to load
Function pdca_channel_write_reload()
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Write PDCA channel reload values to hardware.
void pdca_channel_write_reload(
pdca_channel_num_t pdca_ch_number,
volatile void * addr,
uint32_t size)
Table 6-16. Parameters
6.3.15
Data direction
Parameter name
Description
[in]
pdca_ch_number
PDCA channel
[in]
addr
Address where data to load is
storedr
[in]
size
Size of the data block to load
Data direction
Parameter name
Description
[in]
pdca
Base address of the PDCA module
Data direction
Parameter name
Description
[in]
pdca
Base address of the PDCA module
Function pdca_disable()
Disable the PDCA module.
void pdca_disable(
Pdca * pdca)
Table 6-17. Parameters
6.3.16
Function pdca_enable()
Disable the PDCA module.
void pdca_enable(
Pdca * pdca)
Table 6-18. Parameters
6.3.17
Function pdca_get_channel_status()
Get the PDCA channel transfer enable status.
enum pdca_channel_status pdca_get_channel_status(
pdca_channel_num_t pdca_ch_number)
Table 6-19. Parameters
Data direction
Parameter name
Description
[in]
pdca_ch_number
PDCA channel
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Returns
1 if channel transfer is enabled.
0 if channel transfer is disabled.
6.4
Enumeration Definitions
6.4.1
Enum pdca_channel_status
PDCA channel status.
Table 6-20. Members
Enum value
Description
PDCA_CH_FREE
PDCA channel disabled.
PDCA_CH_BUSY
PDCA channel enabled but transfer is on-going.
PDCA_CH_COUNTER_RELOAD_IS_ZERO
PDCA channel counter reload is zero.
PDCA_CH_TRANSFER_COMPLETED
PDCA channel has completed a block transfer.
PDCA_CH_TRANSFER_ERROR
PDCA channel failed to complete a block
transfer.
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7.
Extra Information for Peripheral DMA Controller Driver
7.1
Acronyms
Below is a table listing the acronyms used in this module, along with their intended meanings.
7.2
Acronym
Definition
DMA
Direct Memory Access
QSG
Quick Start Guide
Dependencies
This driver has the following dependencies:
7.3
●
System Clock Management (Sysclock)
●
Sleep Manager (Sleepmgr)
Errata
There are no errata related to this driver.
7.4
Module History
An overview of the module history is presented in the table below, with details on the enhancements and fixes
made to the module since its first release. The current version of this corresponds to the newest version in the
table.
Changelog
Initial document release
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8.
Examples for Peripheral DMA Controller
This is a list of the available Quick Start Guides (QSGs) and example applications for SAM4L Peripheral DMA
Controller (PDCA). QSGs are simple examples with step-by-step instructions to configure and use this driver in
a selection of use cases. Note that QSGs can be compiled as a standalone application or be added to the user
application.
●
Peripheral DMA Controller Example
8.1
Peripheral DMA Controller Example
8.1.1
Purpose
The ASF example in pdca/pdca_usart_example demonstrates how to use PDCA driver to send data to the USART.
8.1.2
Requirements
This example can be used on SAM4L series.
8.1.3
Description
The SAM4L controller sends data in ascii_anim1.h and ascii_anim2.h from USART to the terminal.
8.1.4
Usage
1.
Build the program and download it into the evaluation board.
2.
On the computer, open, and configure a terminal application (e.g., HyperTerminal on Microsoft Windows )
with these settings:
3.
®
●
115200 bauds
●
8 bits of data
●
No parity
●
1 stop bit
●
No flow control
®
In the terminal window, the following text should appear (values depend on the board and chip used):
-- PDCA_USART Example xxx --- xxxxxx-xx
-- Compiled: xxx xx xxxx xx:xx:xx --
4.
The sent text should appear.
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9.
Quickstart guide for SAM PDCA driver
This is the quickstart guide for the SAM PDCA 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.
9.1
Basic use case
In this basic use case, the PDCA module and channel are configured for:
9.1.1
●
Select USART2 as peripheral
●
Interrupt-based handling
Prerequisites
●
System Clock Management (Sysclock)
9.2
Setup steps
9.2.1
Example code
Add to application C-file:
void pdca_callback(void)
{
//Get PDCA RX channel status and check if PDCA transfer complete
if (status == PDCA_CH_TRANSFER_COMPLETED) {
pdca_channel_write_load(PDCA_RX_CHANNEL, g_uc_pdc_buffer, BUFFER_SIZE);
pdca_channel_write_load(PDCA_TX_CHANNEL, g_uc_pdc_buffer, BUFFER_SIZE);
}
}
void pdca_setup(void)
{
pdca_enable(PDCA);
pdca_channel_write_config(PDCA_RX_CHANNEL, &PDCA_RX_CONFIGS);
pdca_channel_write_config(PDCA_TX_CHANNEL, &PDCA_TX_CONFIGS);
pdca_channel_set_callback(PDCA_RX_CHANNEL, pdca_tranfer_done, PDCA_0_IRQn, 1, PDCA_IER_TRC);
pdca_channel_enable(PDCA_RX_CHANNEL);
pdca_channel_enable(PDCA_TX_CHANNEL);
}
9.2.2
Workflow
1.
Define the interrupt callback function in the application:
void pdca_callback(void)
{
//Get PDCA RX channel status and check if PDCA transfer complete
if (status == PDCA_CH_TRANSFER_COMPLETED) {
pdca_channel_write_load(PDCA_RX_CHANNEL, g_uc_pdc_buffer, BUFFER_SIZE);
pdca_channel_write_load(PDCA_TX_CHANNEL, g_uc_pdc_buffer, BUFFER_SIZE);
}
}
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2.
Enable PDCA module:
pdca_enable(PDCA);
Note
Includes enabling the module clock and clock sleep mode.
3.
Configure PDCA channel with specified mode:
pdca_channel_write_config(PDCA_RX_CHANNEL, &PDCA_RX_CONFIGS);
pdca_channel_write_config(PDCA_TX_CHANNEL, &PDCA_TX_CONFIGS);
4.
Set the PDCA callback function and enable PDCA interrupt.
pdca_channel_set_callback(PDCA_RX_CHANNEL, pdca_tranfer_done, PDCA_0_IRQn, 1, PDCA_IER_TRC);
5.
Enable PDCA channel:
pdca_channel_enable(PDCA_RX_CHANNEL);
pdca_channel_enable(PDCA_TX_CHANNEL);
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Index
E
Enumeration Definitions
pdca_channel_status, 16
F
Function Definitions
pdca_channel_clear_error, 10
pdca_channel_disable, 11
pdca_channel_disable_interrupt, 11
pdca_channel_enable, 11
pdca_channel_enable_interrupt, 11
pdca_channel_get_handler, 12
pdca_channel_get_interrupt_mask, 12
pdca_channel_is_enabled, 12
pdca_channel_read_load_size, 13
pdca_channel_read_reload_size, 13
pdca_channel_set_callback, 13
pdca_channel_set_config, 14
pdca_channel_write_load, 14
pdca_channel_write_reload, 14
pdca_disable, 15
pdca_enable, 15
pdca_get_channel_status, 15
S
Structure Definitions
pdca_channel_config_t, 10
T
Type Definitions
pdca_callback_t, 10
pdca_channel_interrupt_mask_t, 10
pdca_channel_num_t, 10
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Document Revision History
Doc. Rev.
Date
Comments
42313A
05/2014
Initial document release
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