spi_xdmac_example.c File Reference

Serial Peripheral Interface (SPI) XDMAC example for SAMV71/SAME70.

Copyright (c) 2015-2018 Microchip Technology Inc. and its subsidiaries.

#include "asf.h"
#include "stdio_serial.h"
#include "conf_board.h"
#include "conf_clock.h"
#include "conf_spi_example.h"

Macros
#define	BUFFER_SIZE   100
	The buffer size for transfer. More...
#define	MASTER_MODE   0
	spi mode definition More...
#define	NUM_SPCK_CONFIGURATIONS   4
#define	SLAVE_MODE   1
#define	SPI0_XDMAC_RX_CH_NUM   2
#define	SPI0_XDMAC_TX_CH_NUM   1
	XDMAC channel HW Interface number for SPI0,refer to datasheet. More...
#define	SPI_CHIP_PCS   spi_get_pcs(SPI_CHIP_SEL)
#define	SPI_CHIP_SEL   0
#define	SPI_CLK_PHASE   0
#define	SPI_CLK_POLARITY   0
#define	SPI_DLYBCT   0x10
#define	SPI_DLYBS   0x40
#define	STRING_EOL   "\r"
#define	STRING_HEADER
#define	XDMAC_RX_CH   1
#define	XDMAC_TX_CH   0
	XDMAC channel used in this example. More...

Functions
static void	configure_console (void)
	Configure the Console UART. More...
static void	display_menu (void)
	Display the user menu on the terminal. More...
int	main (void)
	Application entry point for SPI example. More...
static void	spi_disable_xdmac (void)
	disable XDMAC for spi and forbidden transmit and receive by XDMAC. More...
static void	spi_master_go (void)
	Start SPI transfer test. More...
static void	spi_master_initialize (void)
	Initialize SPI as master. More...
static void	spi_set_clock_configuration (uint8_t configuration)
	Set the specified SPI clock configuration. More...
static void	spi_slave_initialize (void)
	Initialize SPI as slave. More...
static void	spi_xdmac_configure (Spi *const pspi)
	configure xdmac for spi and ready to transfer/receive. More...
void	XDMAC_Handler (void)
	XDMAC interrupt handler. More...

Variables
uint32_t	g_size = sizeof(tx_buffer)
uint32_t	g_uc_role
static const uint32_t	gs_ul_clock_configurations []
static uint32_t	gs_ul_spi_clock = 500000
uint8_t	rx_buffer [BUFFER_SIZE] = "0"
uint8_t	tx_buffer [] = "This is message from SPI master transferred by XDMAC test"
static xdmac_channel_config_t	xdmac_rx_cfg
static xdmac_channel_config_t	xdmac_tx_cfg
	XDMAC channel configuration. More...

#define BUFFER_SIZE   100

The buffer size for transfer.

#define MASTER_MODE   0

spi mode definition

Referenced by spi_master_initialize().

#define NUM_SPCK_CONFIGURATIONS   4

Referenced by display_menu(), and main().

#define SLAVE_MODE   1

Referenced by spi_slave_initialize(), and XDMAC_Handler().

#define SPI0_XDMAC_RX_CH_NUM   2

Referenced by spi_xdmac_configure().

#define SPI0_XDMAC_TX_CH_NUM   1

XDMAC channel HW Interface number for SPI0,refer to datasheet.

Referenced by spi_xdmac_configure().

#define SPI_CHIP_PCS   spi_get_pcs(SPI_CHIP_SEL)

Referenced by spi_master_initialize(), and spi_slave_initialize().

#define SPI_CHIP_SEL   0

Referenced by spi_master_initialize(), and spi_slave_initialize().

#define SPI_CLK_PHASE   0

Referenced by spi_master_initialize(), and spi_slave_initialize().

#define SPI_CLK_POLARITY   0

Referenced by spi_master_initialize(), and spi_slave_initialize().

#define SPI_DLYBCT   0x10

Referenced by spi_master_initialize().

#define SPI_DLYBS   0x40

Referenced by spi_master_initialize().

#define STRING_EOL   "\r"

#define STRING_HEADER

Value:

"--Spi XDMAC Example --\r\n" \
        "-- "BOARD_NAME" --\r\n" \
        "-- Compiled: "__DATE__" "__TIME__" --"STRING_EOL

Referenced by main().

#define XDMAC_RX_CH   1

Referenced by spi_disable_xdmac(), spi_xdmac_configure(), and XDMAC_Handler().

#define XDMAC_TX_CH   0

XDMAC channel used in this example.

Referenced by spi_disable_xdmac(), and spi_xdmac_configure().

static void configure_console ( void  )

static

Configure the Console UART.

References uart_rs232_options::baudrate, and stdio_serial_init().

Referenced by main().

static void display_menu ( void  )

static

Display the user menu on the terminal.

References NUM_SPCK_CONFIGURATIONS.

Referenced by main().

int main

(

void

)

Application entry point for SPI example.

Returns

Unused (ANSI-C compatibility).

References board_init(), configure_console(), display_menu(), NUM_SPCK_CONFIGURATIONS, spi_disable_xdmac(), spi_master_go(), spi_set_clock_configuration(), spi_slave_initialize(), spi_xdmac_configure(), STRING_HEADER, and sysclk_init().

static void spi_disable_xdmac ( void  )

static

disable XDMAC for spi and forbidden transmit and receive by XDMAC.

References xdmac_channel_disable(), xdmac_channel_disable_interrupt(), xdmac_disable_interrupt(), XDMAC_RX_CH, and XDMAC_TX_CH.

Referenced by main(), and spi_set_clock_configuration().

static void spi_master_go ( void  )

static

Start SPI transfer test.

Configure xdamc for spi0 and ready to transfer

References spi_master_initialize(), and spi_xdmac_configure().

Referenced by main().

static void spi_master_initialize ( void  )

static

Initialize SPI as master.

References MASTER_MODE, SPI_CHIP_PCS, SPI_CHIP_SEL, SPI_CLK_PHASE, SPI_CLK_POLARITY, spi_disable(), spi_disable_mode_fault_detect(), SPI_DLYBCT, SPI_DLYBS, spi_enable(), spi_enable_clock(), spi_reset(), spi_set_baudrate_div(), spi_set_bits_per_transfer(), spi_set_clock_phase(), spi_set_clock_polarity(), spi_set_lastxfer(), spi_set_master_mode(), spi_set_peripheral_chip_select_value(), spi_set_transfer_delay(), and sysclk_get_peripheral_hz().

Referenced by spi_master_go(), and spi_set_clock_configuration().

static void spi_set_clock_configuration ( uint8_t  configuration )

static

Set the specified SPI clock configuration.

Parameters

configuration

Index of the configuration to set.

References spi_disable_xdmac(), spi_master_initialize(), and spi_xdmac_configure().

Referenced by main().

static void spi_slave_initialize ( void  )

static

Initialize SPI as slave.

References SLAVE_MODE, SPI_CHIP_PCS, SPI_CHIP_SEL, SPI_CLK_PHASE, SPI_CLK_POLARITY, spi_disable(), spi_disable_mode_fault_detect(), spi_enable(), spi_enable_clock(), spi_reset(), spi_set_bits_per_transfer(), spi_set_clock_phase(), spi_set_clock_polarity(), spi_set_peripheral_chip_select_value(), and spi_set_slave_mode().

Referenced by main().

static void spi_xdmac_configure ( Spi *const  pspi )

static

configure xdmac for spi and ready to transfer/receive.

Parameters

pspi	Base address of the SPI

References g_size, xdmac_channel_config_t::mbr_bc, xdmac_channel_config_t::mbr_cfg, xdmac_channel_config_t::mbr_da, xdmac_channel_config_t::mbr_ds, xdmac_channel_config_t::mbr_dus, xdmac_channel_config_t::mbr_sa, xdmac_channel_config_t::mbr_sus, xdmac_channel_config_t::mbr_ubc, pmc_enable_periph_clk(), SPI0_XDMAC_RX_CH_NUM, SPI0_XDMAC_TX_CH_NUM, xdmac_channel_enable(), xdmac_channel_enable_interrupt(), xdmac_channel_set_descriptor_control(), xdmac_configure_transfer(), xdmac_enable_interrupt(), XDMAC_RX_CH, and XDMAC_TX_CH.

Referenced by main(), nm_bus_ioctl(), spi_master_go(), spi_set_clock_configuration(), and XDMAC_Handler().

void XDMAC_Handler

(

void

)

XDMAC interrupt handler.

re-configure receiver for next reception

References SLAVE_MODE, spi_disable(), spi_xdmac_configure(), xdmac_channel_get_interrupt_status(), and XDMAC_RX_CH.

uint32_t g_size = sizeof(tx_buffer)

Referenced by spi_xdmac_configure().

uint32_t g_uc_role

const uint32_t gs_ul_clock_configurations[]

static

Initial value:

=
        { 500000, 1000000, 2000000, 5000000 }

uint32_t gs_ul_spi_clock = 500000

static

uint8_t rx_buffer[BUFFER_SIZE] = "0"

uint8_t tx_buffer[] = "This is message from SPI master transferred by XDMAC test"

xdmac_channel_config_t xdmac_rx_cfg

static

xdmac_channel_config_t xdmac_tx_cfg

static

XDMAC channel configuration.