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| New comments | Cleaning PCBs: works .. but .. | AVR Freaks General Electronics | 27 | 956 | Commented by barnacle on Sunday, 13 December 2020 - 16:36 | Cleaning PCBs: works .. but ..Commented by barnacle on Sunday, 13 December 2020 - 16:36 | AVR Freaks General Electronics |
| New comments | Problem with programmers and ATxMega128A4U | AVR Freaks In-System Debuggers and Programmers | 6 | 72 | Commented by gchapman on Sunday, 13 December 2020 - 16:26 | Problem with programmers and ATxMega128A4UCommented by gchapman on Sunday, 13 December 2020 - 16:26 | AVR Freaks In-System Debuggers and Programmers |
| New comments | What's changing with dev tools? | AVR Freaks In-System Debuggers and Programmers | 3 | 72 | Commented by awneil on Sunday, 13 December 2020 - 16:05 | What's changing with dev tools?Commented by awneil on Sunday, 13 December 2020 - 16:05 | AVR Freaks In-System Debuggers and Programmers |
| New comments | Curiosity Nano not showing up in Studio | AVR Freaks Atmel Studio (AVR-related) | 5 | 73 | Commented by gchapman on Sunday, 13 December 2020 - 16:04 | Curiosity Nano not showing up in StudioCommented by gchapman on Sunday, 13 December 2020 - 16:04 | AVR Freaks Atmel Studio (AVR-related) |
| New comments | Programming lots of AVRs from one AVR for an AVR cluster. | AVR Freaks megaAVR and tinyAVR | 5 | 48 | Commented by clawson on Sunday, 13 December 2020 - 15:48 | Programming lots of AVRs from one AVR for an AVR cluster.Commented by clawson on Sunday, 13 December 2020 - 15:48 | AVR Freaks megaAVR and tinyAVR |
| New comments | XC8 compiler, variable at I/O register region (GPIOR) | AVR Freaks megaAVR and tinyAVR | 3 | 89 | Commented by TeleVox on Sunday, 13 December 2020 - 15:32 | XC8 compiler, variable at I/O register region (GPIOR)Commented by TeleVox on Sunday, 13 December 2020 - 15:32 | AVR Freaks megaAVR and tinyAVR |
| New comments | Low cost, Selecting between Vusb and Battery | AVR Freaks General Electronics | 11 | 252 | Commented by obdevel on Sunday, 13 December 2020 - 15:26 | Low cost, Selecting between Vusb and BatteryCommented by obdevel on Sunday, 13 December 2020 - 15:26 | AVR Freaks General Electronics |
| New comments | XCL file equivalent in Microchip Studio | AVR Freaks Atmel Studio (AVR-related) | 2 | 43 | Commented by clawson on Sunday, 13 December 2020 - 14:04 | XCL file equivalent in Microchip StudioCommented by clawson on Sunday, 13 December 2020 - 14:04 | AVR Freaks Atmel Studio (AVR-related) |
| New comments | How i can read/write pins of a microcontroller in hardware | AVR Freaks megaAVR and tinyAVR | 8 | 138 | Commented by clawson on Sunday, 13 December 2020 - 13:32 | How i can read/write pins of a microcontroller in hardwareCommented by clawson on Sunday, 13 December 2020 - 13:32 | AVR Freaks megaAVR and tinyAVR |
| New comments | (atmega324pa) avrdude.exe: verification error, first mismatch at byte 0x007f | AVR Freaks megaAVR and tinyAVR | 9 | 458 | Commented by lunius on Sunday, 13 December 2020 - 12:57 | (atmega324pa) avrdude.exe: verification error, first mismatch at byte 0x007fCommented by lunius on Sunday, 13 December 2020 - 12:57 | AVR Freaks megaAVR and tinyAVR |
| New comments | atsaml21j17b io_read function stuck? | Atmel SMART ARM-based MCUs Atmel Cortex-M MCUs | 26 | 355 | Commented by awneil on Sunday, 13 December 2020 - 12:39 | atsaml21j17b io_read function stuck?Commented by awneil on Sunday, 13 December 2020 - 12:39 | Atmel SMART ARM-based MCUs Atmel Cortex-M MCUs |
| New comments | Can't reach maximum value con ADC when using Vcc as external reference. [ATmega128RFA1] | AVR Freaks megaAVR and tinyAVR | 12 | 206 | Commented by N.Winterbottom on Sunday, 13 December 2020 - 10:05 | Can't reach maximum value con ADC when using Vcc as external reference. [ATmega128RFA1]Commented by N.Winterbottom on Sunday, 13 December 2020 - 10:05 | AVR Freaks megaAVR and tinyAVR |
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Description
This package provides access to the Atmel XDMAC (Extended DMA Controller) devices. This support is not intended to expose the full functionality of these devices. It is mainly limited to supporting peripheral DMA (e.g. USART, SPI, etc.). It is currently limited to single DMA transfers.
There is currently no cross-platform/variant standardised eCos DMA I/O interface package, since DMA features and functionality vary greatly between architectures, and event within variants of an architecture. This stand-alone device package allows common DMA support to be shared between devices that implement Atmel DMA Controllers.
The user is directed towards the relevant Atmel documentation for a full description of the XDMAC devices, and to the variant device drivers for examples of the use of this API. This documentation only gives a brief description of the functions available.
The API of this controller is designed to be compatible with that for the Atmel DMAC controller and is a drop-in replacement for it. Thus the API refers to the DMAC in its naming, not the XDMAC.
A XDMAC instance is defined by a controller number (0 or 1), and each controller has support for a number of (variant defined) channels. The API uses a simple 32-bit encoding to describe how a specific DMA channel should be used, with this package providing helper macros to combine the necessary information into a unique descriptor. These descriptors may be stored with a device driver as required.
The following are examples of how definitions can be made:
Before DMA transfers can be performed, a DMA channel must be claimed. This is done by calling atmel_dmac_chan_alloc(). The descriptor argument describes the majority of the DMA transfer configuration that will be used. As shown in the examples above the passed descriptor not only encodes the source and destination interfaces, but also the transfer sizes. Also, depending on the descriptor construction macros used, it is possible to control the direction and modification of addresses during transfers. The cb argument is used to register a client function that will be called when a requested transfer completes. The priv argument is a client specified value that will be passed to the callback function, and can be used to reference client driver specific data.
The atmel_dmac_chan_config() function is present for compatibility with the DMAC driver. It is not currently needed, but device drivers that may use both drivers may call this with not effect.
Most drivers will allocate a DMA channel object and keep it active throughout the system lifetime. However, if it is necessary to share a channel, or otherwise disable the use of a stream, the driver may call atmel_dmac_chan_free() to return a channel to an unused state. It will be necessary to call atmel_dmac_chan_alloc() Foundation licence manual pdf. before specific DMA descriptor operations can be performed again.
The register callback function has the following prototype:
The ch is the channel structure describing the transfer. The cbid argument is a completion identifier:
Table 110.1. Completion Codes
CYGHWR_ATMEL_DMA_COMPLETE | A valid transfer completion. The count argument should match the size passed to the atmel_dmac_start() call. |
CYGHWR_ATMEL_DMA_AHBERR | This code indicates that the DMA Controller has detected an AHB read or write access error. This may indicate invalid memory addresses have been passed, or invalid AHB_IF mappings have been used. |
CYGHWR_ATMEL_DMA_DICERR | For configurations where Descriptor Integrity Check support is available, and enabled, then if an error is detected in a referenced memory-based transfer structure this result will be raised. |
The count argument is the number of data items successfully transferred. The data argument is the client private data registered for the callback.
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A transfer is configured and started by calling atmel_dmac_start(). The ch argument describes the DMA channel, with the descriptor used when allocating the channel defining how the other arguments are used. The src argument defines the peripheral or memory address from which the transfer will be made. The dst argument supplies the peripheral or memory address to which the transfer will write. The size argument defines the number of data items to be transferred. Once this function call completes the channel is operational and will transfer data once the relevant peripheral starts triggering transfers.
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When the transfer completes the registered callback is called from DSR mode.
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