STM32 DMA subsystem driver header. More...

#include <ch.h>
#include <hal.h>

Include dependency graph for hal_stm32_dma.h:

This graph shows which files directly or indirectly include this file:

Data Structures
struct	DMAConfig
	DMA stream configuration structure. More...

struct	DMADriver
	Structure representing a DMA driver. More...

Macros
#define	STM32_DMA_USE_WAIT TRUE
	Enables synchronous APIs. More...

#define	STM32_DMA_USE_MUTUAL_EXCLUSION FALSE
	Enables the `dmaAcquireBus()` and `dmaReleaseBus()` APIs. More...

#define	STM32_DMA_SUPPORTS_CSELR FALSE

Typedefs
typedef struct DMADriver	DMADriver
	Type of a structure representing an DMA driver. More...

typedef void(*	dmacallback_t )(DMADriver dmap, void buffer, const size_t n)
	DMA notification callback type. More...

typedef void(*	dmaerrorcallback_t )(DMADriver *dmap, dmaerrormask_t err)
	DMA error callback type. More...

Enumerations
enum	dmastate_t { DMA_UNINIT = 0, DMA_STOP = 1, DMA_READY = 2, DMA_ACTIVE = 3, DMA_COMPLETE = 4, DMA_ERROR = 5 }
	Driver state machine possible states. More...

enum	dmaerrormask_t { DMA_ERR_TRANSFER_ERROR = 1 << 0, DMA_ERR_DIRECTMODE_ERROR = 1 << 1, DMA_ERR_FIFO_ERROR = 1 << 2 }
	Possible DMA failure causes. More...

enum	dmadirection_t { DMA_DIR_P2M = 1, DMA_DIR_M2P = 2, DMA_DIR_M2M = 3 }
	DMA transfert direction. More...

Low level driver helper macros
#define	_dma_reset_i(dmap) osalThreadResumeI(&(dmap)->thread, MSG_RESET)
	Resumes a thread waiting for a dma transfert completion. More...

#define	_dma_reset_s(dmap) osalThreadResumeS(&(dmap)->thread, MSG_RESET)
	Resumes a thread waiting for a dma transfert completion. More...

#define	_dma_wakeup_isr(dmap)
	Wakes up the waiting thread. More...

#define	_dma_timeout_isr(dmap)
	Wakes up the waiting thread with a timeout message. More...

static void	_dma_isr_half_code (DMADriver *dmap)
	Common ISR code, half buffer event. More...

static void	_dma_isr_full_code (DMADriver *dmap)
	Common ISR code, full buffer event. More...

static void	_dma_isr_error_code (DMADriver *dmap, dmaerrormask_t err)
	Common ISR code, error event. More...

void	dmaObjectInit (DMADriver *dmap)

bool	dmaStart (DMADriver dmap, const DMAConfig cfg)
	Configures and activates the DMA peripheral. More...

void	dmaStop (DMADriver *dmap)
	Deactivates the DMA peripheral. More...

msg_t	dmaTransfertTimeout (DMADriver dmap, volatile void periphp, void *mem0p, const size_t size, sysinterval_t timeout)
	Performs a DMA transaction. More...

static msg_t	dmaTransfert (DMADriver dmap, volatile void periphp, void *mem0p, const size_t size)

void	dmaAcquireBus (DMADriver *dmap)
	Gains exclusive access to the DMA peripheral. More...

void	dmaReleaseBus (DMADriver *dmap)
	Releases exclusive access to the DMA peripheral. More...

bool	dmaStartTransfert (DMADriver dmap, volatile void periphp, void *mem0p, const size_t size)
	Starts a DMA transaction. More...

void	dmaStopTransfert (DMADriver *dmap)
	Stops an ongoing transaction. More...

bool	dmaStartTransfertI (DMADriver dmap, volatile void periphp, void *mem0p, const size_t size)
	Starts a DMA transaction. More...

void	dmaStopTransfertI (DMADriver *dmap)
	Stops an ongoing transaction. More...

bool	dma_lld_start (DMADriver *dmap)
	Configures and activates the DMA peripheral. More...

void	dma_lld_stop (DMADriver *dmap)
	Deactivates the DMA peripheral. More...

bool	dma_lld_start_transfert (DMADriver dmap, volatile void periphp, void *mem0p, const size_t size)
	Starts a DMA transaction. More...

void	dma_lld_stop_transfert (DMADriver *dmap)
	Stops an ongoing transaction. More...

Detailed Description

STM32 DMA subsystem driver header.

Author: Alexandre Bustico Gautier Hattenberger gauti.nosp@m.er.h.nosp@m.atten.nosp@m.berg.nosp@m.er@en.nosp@m.ac.f.nosp@m.r

Definition in file hal_stm32_dma.h.

Data Structure Documentation

struct DMAConfig

DMA stream configuration structure.

This implementation-dependent structure describes a DMA operation.

Note: The use of this configuration structure requires knowledge of STM32 DMA registers interface, please refer to the STM32 reference manual for details.

Definition at line 239 of file hal_stm32_dma.h.

Collaboration diagram for DMAConfig:

Data Fields
bool	circular	Enables the circular buffer mode for the stream.
dmadirection_t	direction	DMA transaction direction.
uint8_t	dma_priority	DMA priority (1 . . 4)
dmacallback_t	end_cb	Callback function associated to the stream or `NULL`.
dmaerrorcallback_t	error_cb	Error callback or `NULL`.
bool	inc_memory_addr	Enable increment of memory address after each transfert.
bool	inc_peripheral_addr	Enable increment of peripheral address after each transfert.
uint8_t	irq_priority	DMA IRQ priority (2 . . 7)
uint8_t	msize	DMA memory data granurality in bytes (1,2,4)
uint8_t	psize	DMA peripheral data granurality in bytes (1,2,4)
uint32_t	stream	stream associated with transaction Note use STM32_DMA_STREAM_ID macro

struct DMADriver

Structure representing a DMA driver.

Definition at line 354 of file hal_stm32_dma.h.

Collaboration diagram for DMADriver:

Data Fields
const DMAConfig *	config	Current configuration data.
uint8_t	controller	controller associated with stream
uint32_t	dmamode	hold DMA CR register for the stream
const stm32_dma_stream_t *	dmastream	DMA stream associated with peripheral or memory.
void *	mem0p	memory address Note for now, only half buffer with one memory pointer is managed mem1p not yet interfaced
size_t	size	hold size of current transaction
dmastate_t	state	Driver state.

Macro Definition Documentation

#define _dma_reset_i ( dmap ) osalThreadResumeI(&(dmap)->thread, MSG_RESET)

Resumes a thread waiting for a dma transfert completion.

Parameters

[in] dmap pointer to the DMADriver object

Definition at line 131 of file hal_stm32_dma.h.

Referenced by dmaStopTransfertI().

#define _dma_reset_s ( dmap ) osalThreadResumeS(&(dmap)->thread, MSG_RESET)

Resumes a thread waiting for a dma transfert completion.

Parameters

[in] dmap pointer to the DMADriver object

Definition at line 141 of file hal_stm32_dma.h.

Referenced by dmaStopTransfert().

#define _dma_timeout_isr ( dmap )

Value:

{                                            \
    osalSysLockFromISR();                                                     \
    osalThreadResumeI(&(dmap)->thread, MSG_TIMEOUT);                          \
    osalSysUnlockFromISR();                                                   \
  }

Wakes up the waiting thread with a timeout message.

Parameters

[in] dmap pointer to the DMADriver object

Definition at line 164 of file hal_stm32_dma.h.

Referenced by _dma_isr_error_code().

#define _dma_wakeup_isr ( dmap )

Value:

{                                             \
    osalSysLockFromISR();                                                     \
    osalThreadResumeI(&(dmap)->thread, MSG_OK);                               \
    osalSysUnlockFromISR();                                                   \
  }

Wakes up the waiting thread.

Parameters

[in] dmap pointer to the DMADriver object

Definition at line 151 of file hal_stm32_dma.h.

Referenced by _dma_isr_full_code().

#define STM32_DMA_SUPPORTS_CSELR FALSE

Definition at line 52 of file hal_stm32_dma.h.

Referenced by dma_lld_start().

#define STM32_DMA_USE_MUTUAL_EXCLUSION FALSE

Enables the dmaAcquireBus() and dmaReleaseBus() APIs.

Note: Disabling this option saves both code and data space.

Definition at line 48 of file hal_stm32_dma.h.

#define STM32_DMA_USE_WAIT TRUE

Enables synchronous APIs.

Note: Disabling this option saves both code and data space.

Definition at line 40 of file hal_stm32_dma.h.

Typedef Documentation

typedef void(* dmacallback_t)(DMADriver *dmap, void *buffer, const size_t n)

DMA notification callback type.

Parameters

[in]	dmap	pointer to the `DMADriver` object triggering the callback
[in]	buffer	pointer to the most recent samples data
[in]	n	number of buffer rows available starting from `buffer`

Definition at line 101 of file hal_stm32_dma.h.

typedef struct DMADriver DMADriver

Type of a structure representing an DMA driver.

Definition at line 91 of file hal_stm32_dma.h.

typedef void(* dmaerrorcallback_t)(DMADriver *dmap, dmaerrormask_t err)

DMA error callback type.

Parameters

[in]	dmap	pointer to the `DMADriver` object triggering the callback
[in]	err	DMA error code

Definition at line 111 of file hal_stm32_dma.h.

Enumeration Type Documentation

enum dmadirection_t

DMA transfert direction.

Enumerator
DMA_DIR_P2M	PERIPHERAL to MEMORY.
DMA_DIR_M2P	MEMORY to PERIPHERAL.
DMA_DIR_M2M	MEMORY to MEMORY.

Definition at line 82 of file hal_stm32_dma.h.

enum dmaerrormask_t

Possible DMA failure causes.

Note: Error codes are architecture dependent and should not relied upon.

Enumerator
DMA_ERR_TRANSFER_ERROR	DMA transfer failure.
DMA_ERR_DIRECTMODE_ERROR	DMA Direct Mode failure.
DMA_ERR_FIFO_ERROR	DMA FIFO overrun or underrun.

Definition at line 73 of file hal_stm32_dma.h.

enum dmastate_t

Driver state machine possible states.

Enumerator
DMA_UNINIT	Not initialized.
DMA_STOP	Stopped.
DMA_READY	Ready.
DMA_ACTIVE	Transfering.
DMA_COMPLETE	Transfert complete.
DMA_ERROR	Transfert error.

Definition at line 59 of file hal_stm32_dma.h.

Function Documentation

static void _dma_isr_error_code	(	DMADriver *	dmap,
		dmaerrormask_t	err
	)

inlinestatic

Common ISR code, error event.

This code handles the portable part of the ISR code:

Callback invocation.
Waiting thread timeout signaling, if any.
Driver state transitions.

Note: This macro is meant to be used in the low level drivers implementation only.

Parameters

[in]	adcp	pointer to the `ADCDriver` object
[in]	err	platform dependent error code

Definition at line 577 of file hal_stm32_dma.h.

References _dma_timeout_isr, DMADriver::config, DMA_ERROR, dma_lld_stop_transfert(), DMA_READY, DMAConfig::error_cb, and DMADriver::state.

Referenced by dma_lld_serve_interrupt().

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static void _dma_isr_full_code ( DMADriver * dmap )

inlinestatic

Common ISR code, full buffer event.

This code handles the portable part of the ISR code:

Callback invocation.
Waiting thread wakeup, if any.
Driver state transitions.

Note: This macro is meant to be used in the low level drivers implementation only.

Parameters

[in] adcp pointer to the ADCDriver object

Definition at line 523 of file hal_stm32_dma.h.

References _dma_wakeup_isr, DMAConfig::circular, DMADriver::config, DMA_COMPLETE, dma_lld_stop_transfert(), DMA_READY, DMAConfig::end_cb, DMADriver::mem0p, DMAConfig::msize, DMADriver::size, and DMADriver::state.

Referenced by dma_lld_serve_interrupt().

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static void _dma_isr_half_code ( DMADriver * dmap )

inlinestatic

Common ISR code, half buffer event.

This code handles the portable part of the ISR code:

Callback invocation.

Note: This macro is meant to be used in the low level drivers implementation only.

Parameters

[in] adcp pointer to the ADCDriver object

Definition at line 506 of file hal_stm32_dma.h.

References DMADriver::config, DMAConfig::end_cb, DMADriver::mem0p, and DMADriver::size.

Referenced by dma_lld_serve_interrupt().

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bool dma_lld_start ( DMADriver * dmap )

Configures and activates the DMA peripheral.

Parameters

[in] dmap pointer to the DMADriver object

Definition at line 383 of file hal_stm32_dma.c.

References DMAConfig::circular, DMADriver::config, DMADriver::controller, DMAConfig::direction, DMA_DIR_M2M, DMA_DIR_M2P, DMA_DIR_P2M, dma_lld_serve_interrupt(), DMAConfig::dma_priority, DMADriver::dmamode, DMADriver::dmastream, DMAConfig::end_cb, DMAConfig::error_cb, DMAConfig::inc_memory_addr, DMAConfig::inc_peripheral_addr, DMAConfig::irq_priority, DMAConfig::msize, DMAConfig::psize, STM32_DMA_SUPPORTS_CSELR, and DMAConfig::stream.

Referenced by dmaStart().

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bool dma_lld_start_transfert	(	DMADriver *	dmap,
		volatile void *	periphp,
		void *	mem0p,
		const size_t	size
	)

Starts a DMA transaction.

Parameters

[in] dmap pointer to the DMADriver object

Definition at line 656 of file hal_stm32_dma.c.

References DMADriver::dmamode, DMADriver::dmastream, DMADriver::mem0p, and DMADriver::size.

Referenced by dmaStartTransfertI().

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void dma_lld_stop ( DMADriver * dmap )

Deactivates the DMA peripheral.

Parameters

[in] dmap pointer to the DMADriver object

Definition at line 688 of file hal_stm32_dma.c.

References DMADriver::dmastream.

Referenced by dmaStop().

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void dma_lld_stop_transfert ( DMADriver * dmap )

Stops an ongoing transaction.

Parameters

[in] dmap pointer to the DMADriver object

Definition at line 676 of file hal_stm32_dma.c.

References DMADriver::dmastream.

Referenced by _dma_isr_error_code(), _dma_isr_full_code(), dmaStopTransfert(), and dmaStopTransfertI().

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void dmaAcquireBus ( DMADriver * dmap )

Gains exclusive access to the DMA peripheral.

This function tries to gain ownership to the DMA bus, if the bus is already being used then the invoking thread is queued.

Precondition: In order to use this function the option DMA_USE_MUTUAL_EXCLUSION must be enabled.

Parameters

[in] dmap pointer to the DMADriver object

Definition at line 332 of file hal_stm32_dma.c.

void dmaObjectInit ( DMADriver * dmap )

Definition at line 53 of file hal_stm32_dma.c.

References DMADriver::config, DMA_STOP, DMADriver::mem0p, and DMADriver::state.

Referenced by dshotStart(), and light_ws2812_arch_init().

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void dmaReleaseBus ( DMADriver * dmap )

Releases exclusive access to the DMA peripheral.

Precondition: In order to use this function the option DMA_USE_MUTUAL_EXCLUSION must be enabled.

Parameters

[in] dmap pointer to the DMADriver object

Definition at line 349 of file hal_stm32_dma.c.

bool dmaStart	(	DMADriver *	dmap,
		const DMAConfig *	cfg
	)

Configures and activates the DMA peripheral.

Parameters

[in]	dmap	pointer to the `DMADriver` object
[in]	config	pointer to the `DMAConfig` object.

Returns: The operation result.

Return values

true	dma driver is OK
false	incoherencies has been found in config

Definition at line 85 of file hal_stm32_dma.c.

References DMADriver::config, dma_lld_start(), DMA_READY, DMA_STOP, and DMADriver::state.

Referenced by dshotStart(), and light_ws2812_arch_init().

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bool dmaStartTransfert	(	DMADriver *	dmap,
		volatile void *	periphp,
		void *	mem0p,
		const size_t	size
	)

Starts a DMA transaction.

Starts one or many asynchronous dma transaction(s) depending on continuous field

Postcondition: The callbacks associated to the DMA config will be invoked on buffer fill and error events, and timeout events in case STM32_DMA_USE_ASYNC_TIMOUT == TRUE

Note: The datas are sequentially written into the buffer with no gaps.

Parameters

[in]	dmap	pointer to the `DMADriver` object
[in,out]	periphp	pointer to a `peripheral` register address
[in,out]	mem0p	pointer to the data buffer
[in]	size	buffer size. The buffer size must be one or an even number.

Definition at line 142 of file hal_stm32_dma.c.

References dmaStartTransfertI().

Referenced by dshotSendFrame(), and light_ws2812_arch_init().

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bool dmaStartTransfertI	(	DMADriver *	dmap,
		volatile void *	periphp,
		void *	mem0p,
		const size_t	size
	)

Starts a DMA transaction.

Starts one or many asynchronous dma transaction(s) depending on continuous field

Postcondition: The callbacks associated to the DMA config will be invoked on buffer fill and error events, and timeout events in case STM32_DMA_USE_ASYNC_TIMOUT == TRUE

Note: The datas are sequentially written into the buffer with no gaps.

Parameters

[in]	dmap	pointer to the `DMADriver` object
[in,out]	periphp	pointer to a `peripheral` register address
[in,out]	mem0p	pointer to the data buffer
[in]	size	buffer size. The buffer size must be one or an even number.

Definition at line 167 of file hal_stm32_dma.c.

References DMADriver::config, DMA_ACTIVE, DMA_COMPLETE, DMA_ERROR, dma_lld_start_transfert(), DMA_READY, DMAConfig::msize, DMAConfig::psize, and DMADriver::state.

Referenced by dmaStartTransfert(), and dmaTransfertTimeout().

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void dmaStop ( DMADriver * dmap )

Deactivates the DMA peripheral.

Parameters

[in] dmap pointer to the DMADriver object

Definition at line 107 of file hal_stm32_dma.c.

References DMADriver::config, dma_lld_stop(), DMA_READY, DMA_STOP, DMADriver::mem0p, and DMADriver::state.

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void dmaStopTransfert ( DMADriver * dmap )

Stops an ongoing transaction.

This function stops the currently ongoing transaction and returns the driver in the DMA_READY state. If there was no transaction being processed then the function does nothing.

Parameters

[in] dmap pointer to the DMADriver object

Definition at line 232 of file hal_stm32_dma.c.

References _dma_reset_s, DMA_ACTIVE, dma_lld_stop_transfert(), DMA_READY, and DMADriver::state.

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void dmaStopTransfertI ( DMADriver * dmap )

Stops an ongoing transaction.

This function stops the currently ongoing transaction and returns the driver in the DMA_READY state. If there was no transaction being processed then the function does nothing.

Parameters

[in] dmap pointer to the DMADriver object

Definition at line 260 of file hal_stm32_dma.c.

References _dma_reset_i, DMA_ACTIVE, DMA_COMPLETE, dma_lld_stop_transfert(), DMA_READY, and DMADriver::state.

Referenced by dmaTransfertTimeout().

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static msg_t dmaTransfert	(	DMADriver *	dmap,
		volatile void *	periphp,
		void *	mem0p,
		const size_t	size
	)

inlinestatic

Definition at line 427 of file hal_stm32_dma.h.

References dmaTransfertTimeout().

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msg_t dmaTransfertTimeout	(	DMADriver *	dmap,
		volatile void *	periphp,
		void *	mem0p,
		const size_t	size,
		sysinterval_t	timeout
	)

Performs a DMA transaction.

Performs one synchronous dma transaction

Note: The datas are sequentially written into the buffer with no gaps.

Parameters

[in]	dmap	pointer to the `DMADriver` object
[in,out]	periphp	pointer to a `peripheral` register address
[in,out]	mem0p	pointer to the data buffer
[in]	size	buffer size. The buffer size must be one or an even number.
[in]	timeout	function will exit after timeout is transaction is not done can be TIME_INFINITE (but not TIME_IMMEDIATE)

Returns: The operation result.

Return values

MSG_OK	Transaction finished.
MSG_RESET	The transaction has been stopped using `dmaStopTransaction()` or `dmaStopTransactionI()`, the result buffer may contain incorrect data.
MSG_TIMEOUT	The transaction has been stopped because of hardware error or timeout limit reach

Definition at line 303 of file hal_stm32_dma.c.

References dmaStartTransfertI(), dmaStopTransfertI(), and msg.

Referenced by dmaTransfert().

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Data Structures

Macros

Typedefs

Enumerations

Low level driver helper macros

Detailed Description

Data Structure Documentation

Macro Definition Documentation

Typedef Documentation

Enumeration Type Documentation

Function Documentation