spi_example.c File Reference

Serial Peripheral Interface (SPI) example for SAM.

Copyright (c) 2011-2018 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"

Data Structures
struct	status_block_t

Macros
#define	CMD_DATA   0x29380000
#define	CMD_DATA_MSK   0xFFFF0000
#define	CMD_END   0x68390484
#define	CMD_STATUS   0x68390384
#define	CMD_TEST   0x10101010
#define	COMM_BUFFER_SIZE   64
#define	DATA_BLOCK_MSK   0x0000FFFF
#define	MAX_DATA_BLOCK_NUMBER   4
#define	MAX_RETRY   4
#define	NB_STATUS_CMD   20
#define	NUM_SPCK_CONFIGURATIONS   4
#define	RC_RDY   0x12345678
#define	RC_SYN   0x55AA55AA
#define	SLAVE_STATE_DATA   2
#define	SLAVE_STATE_END   5
#define	SLAVE_STATE_IDLE   0
#define	SLAVE_STATE_STATUS   4
#define	SLAVE_STATE_STATUS_ENTRY   3
#define	SLAVE_STATE_TEST   1
#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	UART_BAUDRATE   115200

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...
void	SPI_Handler (void)
	Interrupt handler for the SPI slave. 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_master_transfer (void *p_buf, uint32_t size)
	Perform SPI master transfer. More...
static void	spi_set_clock_configuration (uint8_t configuration)
	Set the specified SPI clock configuration. More...
static void	spi_slave_command_process (void)
	SPI command block process. More...
static void	spi_slave_initialize (void)
	Initialize SPI as slave. More...
static void	spi_slave_new_command (void)
	Start waiting new command. More...
static void	spi_slave_transfer (void *p_buf, uint32_t size)
	Set SPI slave transfer. More...

Variables
static uint8_t *	gs_puc_transfer_buffer
static struct status_block_t	gs_spi_status
static uint8_t	gs_uc_spi_buffer [COMM_BUFFER_SIZE]
static const uint32_t	gs_ul_clock_configurations []
static uint32_t	gs_ul_spi_clock = 500000
static uint32_t	gs_ul_spi_cmd = RC_SYN
static uint32_t	gs_ul_spi_state = 0
static uint32_t	gs_ul_test_block_number
static uint32_t	gs_ul_transfer_index
static uint32_t	gs_ul_transfer_length

#define CMD_DATA   0x29380000

Referenced by spi_master_go(), and spi_slave_command_process().

#define CMD_DATA_MSK   0xFFFF0000

Referenced by spi_slave_command_process().

#define CMD_END   0x68390484

Referenced by SPI_Handler(), spi_master_go(), and spi_slave_command_process().

#define CMD_STATUS   0x68390384

Referenced by spi_master_go().

#define CMD_TEST   0x10101010

Referenced by spi_master_go(), and spi_slave_command_process().

#define COMM_BUFFER_SIZE   64

Referenced by spi_master_go(), and spi_slave_new_command().

#define DATA_BLOCK_MSK   0x0000FFFF

Referenced by spi_slave_command_process().

#define MAX_DATA_BLOCK_NUMBER   4

Referenced by spi_master_go().

#define MAX_RETRY   4

Referenced by spi_master_go().

#define NB_STATUS_CMD   20

Referenced by spi_slave_initialize().

#define NUM_SPCK_CONFIGURATIONS   4

Referenced by display_menu(), and main().

#define RC_RDY   0x12345678

Referenced by spi_master_go(), and spi_slave_new_command().

#define RC_SYN   0x55AA55AA

Referenced by spi_master_go(), spi_slave_initialize(), and spi_slave_new_command().

#define SLAVE_STATE_DATA   2

Referenced by spi_slave_command_process(), and spi_slave_new_command().

#define SLAVE_STATE_END   5

Referenced by spi_slave_command_process(), and spi_slave_new_command().

#define SLAVE_STATE_IDLE   0

Referenced by spi_slave_command_process(), spi_slave_initialize(), and spi_slave_new_command().

#define SLAVE_STATE_STATUS   4

Referenced by spi_slave_command_process(), and spi_slave_new_command().

#define SLAVE_STATE_STATUS_ENTRY   3

Referenced by spi_slave_command_process(), and spi_slave_new_command().

#define SLAVE_STATE_TEST   1

Referenced by spi_slave_command_process(), and spi_slave_new_command().

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

Referenced by main().

#define UART_BAUDRATE   115200

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_master_go(), spi_set_clock_configuration(), spi_slave_initialize(), STRING_HEADER, and sysclk_init().

void SPI_Handler

(

void

)

Interrupt handler for the SPI slave.

References CMD_END, data, gs_spi_status, gs_ul_spi_cmd, gs_ul_transfer_index, spi_read(), spi_read_status(), spi_slave_command_process(), spi_slave_new_command(), spi_write(), status_block_t::ul_cmd_list, and status_block_t::ul_total_command_number.

static void spi_master_go ( void  )

static

Start SPI transfer test.

References CMD_DATA, CMD_END, CMD_STATUS, CMD_TEST, COMM_BUFFER_SIZE, gs_spi_status, MAX_DATA_BLOCK_NUMBER, MAX_RETRY, RC_RDY, RC_SYN, spi_master_initialize(), spi_master_transfer(), status_block_t::ul_cmd_list, status_block_t::ul_total_block_number, and status_block_t::ul_total_command_number.

Referenced by main().

static void spi_master_initialize ( void  )

static

Initialize SPI as master.

References SAM4L, 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_pba_hz().

Referenced by spi_master_go(), and spi_set_clock_configuration().

static void spi_master_transfer ( void *  p_buf, uint32_t  size  )

static

Perform SPI master transfer.

Parameters

pbuf	Pointer to buffer to transfer.
size	Size of the buffer.

References data, spi_read(), spi_read_status(), and spi_write().

Referenced by spi_master_go().

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_master_initialize().

Referenced by main().

static void spi_slave_command_process ( void  )

static

SPI command block process.

References CMD_DATA, CMD_DATA_MSK, CMD_END, CMD_TEST, DATA_BLOCK_MSK, gs_spi_status, SLAVE_STATE_DATA, SLAVE_STATE_END, SLAVE_STATE_IDLE, SLAVE_STATE_STATUS, SLAVE_STATE_STATUS_ENTRY, SLAVE_STATE_TEST, status_block_t::ul_total_block_number, and status_block_t::ul_total_command_number.

Referenced by SPI_Handler().

static void spi_slave_initialize ( void  )

static

Initialize SPI as slave.

References gs_spi_status, NB_STATUS_CMD, RC_SYN, SLAVE_STATE_IDLE, 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_enable_interrupt(), spi_reset(), spi_set_bits_per_transfer(), spi_set_clock_phase(), spi_set_clock_polarity(), spi_set_peripheral_chip_select_value(), spi_set_slave_mode(), spi_slave_transfer(), status_block_t::ul_cmd_list, status_block_t::ul_total_block_number, and status_block_t::ul_total_command_number.

Referenced by main().

static void spi_slave_new_command ( void  )

static

Start waiting new command.

References COMM_BUFFER_SIZE, gs_spi_status, RC_RDY, RC_SYN, SLAVE_STATE_DATA, SLAVE_STATE_END, SLAVE_STATE_IDLE, SLAVE_STATE_STATUS, SLAVE_STATE_STATUS_ENTRY, SLAVE_STATE_TEST, spi_slave_transfer(), and status_block_t::ul_total_block_number.

Referenced by SPI_Handler().

static void spi_slave_transfer ( void *  p_buf, uint32_t  size  )

static

Set SPI slave transfer.

Parameters

p_buf	Pointer to buffer to transfer.
size	Size of the buffer.

References spi_write().

Referenced by spi_slave_initialize(), and spi_slave_new_command().

uint8_t* gs_puc_transfer_buffer

static

struct status_block_t gs_spi_status

static

Referenced by SPI_Handler(), spi_master_go(), spi_slave_command_process(), spi_slave_initialize(), and spi_slave_new_command().

uint8_t gs_uc_spi_buffer[COMM_BUFFER_SIZE]

static

const uint32_t gs_ul_clock_configurations[]

static

Initial value:

=
        { 500000, 1000000, 2000000, 5000000 }

uint32_t gs_ul_spi_clock = 500000

static

uint32_t gs_ul_spi_cmd = RC_SYN

static

Referenced by SPI_Handler().

uint32_t gs_ul_spi_state = 0

static

uint32_t gs_ul_test_block_number

static

uint32_t gs_ul_transfer_index

static

Referenced by SPI_Handler().

uint32_t gs_ul_transfer_length

static