dma.c File Reference

#include <string.h>
#include "dma.h"
#include "clock.h"
#include "system_interrupt.h"

Data Structures
struct	_dma_module

Macros
#define	DMA_CHANNEL_MASK   (0x1f)
	DMA channel mask. More...
#define	MAX_JOB_RESUME_COUNT   10000
	Maximum retry counter for resuming a job transfer. More...

Functions
static uint8_t	_dma_find_first_free_channel_and_allocate (void)
	Find a free channel for a DMA resource. More...
static void	_dma_release_channel (uint8_t channel)
	Release an allocated DMA channel. More...
static void	_dma_set_config (struct dma_resource *resource, struct dma_resource_config *resource_config)
	Configure the DMA resource. More...
void	dma_abort_job (struct dma_resource *resource)
	Abort a DMA transfer. More...
enum status_code	dma_add_descriptor (struct dma_resource *resource, DmacDescriptor *descriptor)
	Add a DMA transfer descriptor to a DMA resource. More...
enum status_code	dma_allocate (struct dma_resource *resource, struct dma_resource_config *config)
	Allocate a DMA with configurations. More...
void	dma_descriptor_create (DmacDescriptor *descriptor, struct dma_descriptor_config *config)
	Create a DMA transfer descriptor with configurations. More...
enum status_code	dma_free (struct dma_resource *resource)
	Free an allocated DMA resource. More...
void	dma_get_config_defaults (struct dma_resource_config *config)
	Initializes config with predefined default values. More...
void	dma_resume_job (struct dma_resource *resource)
	Resume a suspended DMA transfer. More...
enum status_code	dma_start_transfer_job (struct dma_resource *resource)
	Start a DMA transfer. More...
void	dma_suspend_job (struct dma_resource *resource)
	Suspend a DMA transfer. More...
void	DMAC_Handler (void)
	DMA interrupt service routine. More...

Variables
static struct dma_resource *	_dma_active_resource [CONF_MAX_USED_CHANNEL_NUM]
	Internal DMA resource pool. More...
struct _dma_module	_dma_inst
uint8_t	g_chan_interrupt_flag [CONF_MAX_USED_CHANNEL_NUM] ={0}
DmacDescriptor descriptor_section[CONF_MAX_USED_CHANNEL_NUM]	SECTION_DMAC_DESCRIPTOR
	Initial write back memory section. More...

#define DMA_CHANNEL_MASK   (0x1f)

DMA channel mask.

#define MAX_JOB_RESUME_COUNT   10000

Maximum retry counter for resuming a job transfer.

Referenced by dma_resume_job().

static uint8_t _dma_find_first_free_channel_and_allocate ( void  )

static

Find a free channel for a DMA resource.

Find a channel for the requested DMA resource.

Returns

Status of channel allocation.

Return values

DMA_INVALID_CHANNEL	No channel available
count	Allocated channel for the DMA resource

References _dma_module::allocated_channels, count, DMA_INVALID_CHANNEL, _dma_module::free_channels, system_interrupt_enter_critical_section(), and system_interrupt_leave_critical_section().

Referenced by dma_allocate().

static void _dma_release_channel ( uint8_t  channel )

static

Release an allocated DMA channel.

Parameters

[in]

channel

Channel id to be released

References _dma_module::allocated_channels, and _dma_module::free_channels.

Referenced by dma_free().

static void _dma_set_config ( struct dma_resource *  resource, struct dma_resource_config *  resource_config  )

static

Configure the DMA resource.

Parameters

[in]	dma_resource	Pointer to a DMA resource instance
[out]	resource_config	Configurations of the DMA resource

Select the DMA channel and clear software trigger

Enable event output, the event output selection is configured in each transfer descriptor

References Assert, dma_resource::channel_id, dma_resource_config::event_config, dma_events_config::event_output_enable, dma_events_config::input_action, dma_resource_config::peripheral_trigger, dma_resource_config::priority, system_interrupt_enter_critical_section(), system_interrupt_leave_critical_section(), and dma_resource_config::trigger_action.

Referenced by dma_allocate().

void DMAC_Handler

(

void

)

DMA interrupt service routine.

References _dma_active_resource, Assert, dma_resource::callback, dma_resource::callback_enable, dma_resource::channel_id, descriptor_section, DMA_CALLBACK_CHANNEL_SUSPEND, DMA_CALLBACK_TRANSFER_DONE, DMA_CALLBACK_TRANSFER_ERROR, isr(), dma_resource::job_status, resource, STATUS_ERR_IO, STATUS_OK, STATUS_SUSPEND, system_interrupt_enter_critical_section(), system_interrupt_leave_critical_section(), total_size, and dma_resource::transfered_size.

struct dma_resource* _dma_active_resource[CONF_MAX_USED_CHANNEL_NUM]

static

Internal DMA resource pool.

Referenced by dma_allocate(), dma_free(), and DMAC_Handler().

struct _dma_module _dma_inst

Initial value:

= {
    ._dma_init = false,
    .allocated_channels = 0,
    .free_channels = CONF_MAX_USED_CHANNEL_NUM,
}

DmacDescriptor _write_back_section [CONF_MAX_USED_CHANNEL_NUM] SECTION_DMAC_DESCRIPTOR

Initial write back memory section.