SAM Sercom SPI Driver with DMA Quick Start.

#include <asf.h>
#include "conf_quick_start.h"

Macros
#define	BUF_LENGTH 20
	[buf_length] More...

#define	SLAVE_SELECT_PIN CONF_MASTER_SS_PIN
	[spi_baudrate] More...

#define	TEST_SPI_BAUDRATE 1000000UL
	[buf_length] More...

Functions
static void	configure_dma_resource_rx (struct dma_resource *rx_resource)
	[config_dma_resource_tx] More...

static void	configure_dma_resource_tx (struct dma_resource *tx_resource)
	[_transfer_rx_done] More...

static void	configure_spi_master (void)
	[setup_dma_transfer_descriptor_rx] More...

static void	configure_spi_slave (void)
	[configure_spi] More...

int	main (void)
	[configure_spi_slave] [setup] More...

static void	setup_transfer_descriptor_rx (DmacDescriptor *rx_descriptor)
	[setup_dma_transfer_descriptor] More...

static void	setup_transfer_descriptor_tx (DmacDescriptor *tx_descriptor)
	[config_dma_resource_rx] More...

static void	transfer_rx_done (struct dma_resource *const resource)
	[_transfer_tx_done] More...

static void	transfer_tx_done (struct dma_resource *const resource)
	[dma_transfer_descriptor] More...

Variables
static uint8_t	buffer_rx [BUF_LENGTH]

static const uint8_t	buffer_tx [BUF_LENGTH]
	[slave_select_pin] More...

struct dma_resource	example_resource_rx

struct dma_resource	example_resource_tx
	[slave_dev_inst] More...

DmacDescriptor example_descriptor_tx	SECTION_DMAC_DESCRIPTOR
	[dma_transfer_done_flag] More...

struct spi_slave_inst	slave
	[spi_module_inst] More...

struct spi_module	spi_master_instance
	[spi_buffer] More...

struct spi_module	spi_slave_instance

static volatile bool	transfer_rx_is_done = false

static volatile bool	transfer_tx_is_done = false
	[dma_resource] More...

#define BUF_LENGTH 20

[buf_length]

#define SLAVE_SELECT_PIN CONF_MASTER_SS_PIN

[spi_baudrate]

[slave_select_pin]

Referenced by configure_spi_master().

#define TEST_SPI_BAUDRATE 1000000UL

[buf_length]

[spi_baudrate]

Referenced by configure_spi_master().

static void configure_dma_resource_rx ( struct dma_resource * rx_resource )

static

[config_dma_resource_tx]

[config_dma_resource_rx]

[dma_rx_setup_1]

[dma_rx_setup_2]

[dma_rx_setup_3]

[dma_rx_setup_4]

References dma_allocate(), dma_get_config_defaults(), DMA_TRIGGER_ACTION_BEAT, dma_resource_config::peripheral_trigger, and dma_resource_config::trigger_action.

Referenced by main().

static void configure_dma_resource_tx ( struct dma_resource * tx_resource )

static

[_transfer_rx_done]

[config_dma_resource_tx]

[dma_tx_setup_1]

[dma_tx_setup_2]

[dma_tx_setup_3]

[dma_tx_setup_4]

References dma_allocate(), dma_get_config_defaults(), DMA_TRIGGER_ACTION_BEAT, dma_resource_config::peripheral_trigger, and dma_resource_config::trigger_action.

Referenced by main().

static void configure_spi_master ( void )

static

[setup_dma_transfer_descriptor_rx]

[configure_spi]

[spi_master_config]

[spi_master_config] [slave_config]

[slave_config]

[slave_conf_defaults]

[slave_conf_defaults] [ss_pin]

[ss_pin] [slave_init]

[slave_init]

[spi_master_conf_defaults]

[spi_master_mux_setting]

[spi_master_init]

[spi_master_enable]

References spi_master_config::baudrate, spi_config::master, spi_config::mode_specific, spi_config::mux_setting, spi_config::pinmux_pad0, spi_config::pinmux_pad1, spi_config::pinmux_pad2, spi_config::pinmux_pad3, slave, SLAVE_SELECT_PIN, spi_attach_slave(), spi_enable(), spi_get_config_defaults(), spi_init(), spi_master_instance, spi_slave_inst_get_config_defaults(), spi_slave_inst_config::ss_pin, and TEST_SPI_BAUDRATE.

static void configure_spi_slave ( void )

static

[configure_spi]

[configure_spi_slave]

[spi_slave_config]

[spi_slave_conf_defaults]

[spi_slave_conf_defaults] [conf_spi_slave_instance]

[conf_spi_slave_instance] [conf_preload]

[conf_preload] [conf_format]

[conf_format] [spi_slave_mux_setting]

[spi_slave_mux_setting]

[spi_slave_init]

[spi_slave_enable]

References spi_slave_config::frame_format, spi_config::mode, spi_config::mode_specific, spi_config::mux_setting, spi_config::pinmux_pad0, spi_config::pinmux_pad1, spi_config::pinmux_pad2, spi_config::pinmux_pad3, spi_slave_config::preload_enable, spi_config::slave, spi_enable(), SPI_FRAME_FORMAT_SPI_FRAME, spi_get_config_defaults(), spi_init(), SPI_MODE_SLAVE, and spi_slave_instance.

Referenced by main().

int main ( void )

[configure_spi_slave] [setup]

[setup_init] [setup_spi]

[setup_spi]

[setup_dma_resource]

[setup_transfer_descriptor]

[dma_resource_add_descriptor]

[setup_callback_register]

[setup_enable_callback]

[setup_enable_callback] [setup_init]

[main]

[select_slave]

[main_1]

[main_2]

[deselect_slave]

[endless_loop]

[main]

References configure_dma_resource_rx(), configure_dma_resource_tx(), configure_spi_master(), configure_spi_slave(), dma_add_descriptor(), DMA_CALLBACK_TRANSFER_DONE, dma_enable_callback(), dma_register_callback(), dma_start_transfer_job(), example_resource_rx, example_resource_tx, setup_transfer_descriptor_rx(), setup_transfer_descriptor_tx(), slave, spi_master_instance, spi_select_slave(), system_init(), transfer_rx_done(), transfer_rx_is_done, and transfer_tx_done().

static void setup_transfer_descriptor_rx ( DmacDescriptor * rx_descriptor )

static

[setup_dma_transfer_descriptor]

[setup_dma_transfer_descriptor_rx]

[dma_rx_setup_5]

[dma_rx_setup_6]

[dma_rx_setup_7]

[dma_rx_setup_8]

References dma_descriptor_config::beat_size, dma_descriptor_config::block_transfer_count, buffer_rx, dma_descriptor_config::destination_address, DMA_BEAT_SIZE_BYTE, dma_descriptor_create(), dma_descriptor_get_config_defaults(), dma_descriptor_config::source_address, spi_slave_instance, and dma_descriptor_config::src_increment_enable.

Referenced by main().

static void setup_transfer_descriptor_tx ( DmacDescriptor * tx_descriptor )

static

[config_dma_resource_rx]

[setup_dma_transfer_descriptor]

[dma_tx_setup_5]

[dma_tx_setup_6]

[dma_tx_setup_7]

[dma_tx_setup_8]

References dma_descriptor_config::beat_size, dma_descriptor_config::block_transfer_count, buffer_tx, dma_descriptor_config::destination_address, DMA_BEAT_SIZE_BYTE, dma_descriptor_create(), dma_descriptor_get_config_defaults(), dma_descriptor_config::dst_increment_enable, dma_descriptor_config::source_address, and spi_master_instance.

Referenced by main().

static void transfer_rx_done ( struct dma_resource *const resource )

static

[_transfer_tx_done]

[_transfer_rx_done]

References transfer_rx_is_done.

Referenced by main().

static void transfer_tx_done ( struct dma_resource *const resource )

static

[dma_transfer_descriptor]

[setup] [_transfer_tx_done]

References transfer_tx_is_done.

Referenced by main().

uint8_t buffer_rx[BUF_LENGTH]

static

Referenced by setup_transfer_descriptor_rx().

const uint8_t buffer_tx[BUF_LENGTH]

static

Initial value:

= {
        0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A,
        0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14,
}

[slave_select_pin]

[spi_buffer]

Referenced by setup_transfer_descriptor_tx().

struct dma_resource example_resource_rx

Referenced by main().

struct dma_resource example_resource_tx

[slave_dev_inst]

[dma_resource]

Referenced by main().

DmacDescriptor example_descriptor_rx SECTION_DMAC_DESCRIPTOR

[dma_transfer_done_flag]

[dma_transfer_descriptor]

struct spi_slave_inst slave

[spi_module_inst]

[slave_dev_inst]

struct spi_module spi_master_instance

[spi_buffer]

[spi_module_inst]

struct spi_module spi_slave_instance

Referenced by configure_spi_slave(), configure_spi_slave_callbacks(), main(), and setup_transfer_descriptor_rx().

volatile bool transfer_rx_is_done = false

static

Referenced by main(), and transfer_rx_done().

volatile bool transfer_tx_is_done = false

static

[dma_resource]

[dma_transfer_done_flag]

Referenced by transfer_tx_done().

Microchip® Advanced Software Framework

Macros

Functions

Variables