TWI EEPROM PDC Example for SAM.

#include "asf.h"
#include "stdio_serial.h"
#include "conf_board.h"
#include "led.h"

Macros
#define	AT24C_ADDRESS 0x40
	Address of AT24C chips. More...

#define	EEPROM_MEM_ADDR 0

#define	EEPROM_MEM_ADDR_LENGTH 2

#define	STRING_EOL "\r"

#define	STRING_HEADER

#define	TEST_DATA_LENGTH (sizeof(test_data_tx)/sizeof(uint8_t))
	Data to be sent. More...

#define	TWI_CLK 100000
	TWI Bus Clock 100kHz. More...

#define	WAIT_TIME 10
	EEPROM Wait Time. More...

Functions
void	BOARD_TWI_Handler (void)

static void	configure_console (void)
	Configure the Console UART. More...

int	main (void)
	Application entry point for TWI EEPROM example. More...

static void	mdelay (uint32_t ul_dly_ticks)
	Wait for the given number of milliseconds (using the dwTimeStamp generated by the SAM microcontrollers' system tick). More...

void	SysTick_Handler (void)
	Handler for System Tick interrupt. More...

static void	twi_master_pdc_read (Twi p_twi, twi_packet_t p_packet)
	Read multiple bytes from a TWI compatible slave device. More...

static void	twi_master_pdc_write (Twi p_twi, twi_packet_t p_packet)
	Write multiple bytes to a TWI compatible slave device. More...

static uint32_t	twi_read_status (Twi *p_twi)
	Read status register. More...

Variables
Pdc *	g_p_twim_pdc

volatile uint32_t	g_ul_ms_ticks = 0
	Global timestamp in milliseconds since start of application. More...

static uint8_t	gs_uc_test_data_rx [TEST_DATA_LENGTH] = { 0 }
	Reception buffer. More...

twi_packet_t	packet_rx

twi_packet_t	packet_tx
	Define TX and RX packet. More...

volatile uint32_t	Read_Interrupt_Flag = 0

static const volatile uint8_t	test_data_tx []

volatile uint32_t	Write_Interrupt_Flag = 0
	Define interrupt flag. More...

#define AT24C_ADDRESS 0x40

Address of AT24C chips.

Referenced by main().

#define EEPROM_MEM_ADDR 0

Referenced by main().

#define EEPROM_MEM_ADDR_LENGTH 2

Referenced by main().

#define STRING_EOL "\r"

#define STRING_HEADER

Value:

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

Referenced by main().

#define TEST_DATA_LENGTH (sizeof(test_data_tx)/sizeof(uint8_t))

Data to be sent.

Referenced by main().

#define TWI_CLK 100000

TWI Bus Clock 100kHz.

Referenced by main().

#define WAIT_TIME 10

EEPROM Wait Time.

Referenced by main().

void BOARD_TWI_Handler ( void )

References twi_disable_interrupt(), and twi_get_interrupt_mask().

static void configure_console ( void )

static

Configure the Console UART.

References uart_rs232_options::baudrate, stdio_serial_init(), and sysclk_enable_peripheral_clock().

Referenced by main().

int main ( void )

Application entry point for TWI EEPROM example.

Returns: Unused (ANSI-C compatibility).

References twi_packet::addr, twi_packet::addr_length, AT24C_ADDRESS, board_init(), twi_packet::buffer, twi_packet::chip, configure_console(), EEPROM_MEM_ADDR, EEPROM_MEM_ADDR_LENGTH, gs_uc_test_data_rx, twi_packet::length, twi_options::master_clk, mdelay(), pmc_enable_periph_clk(), twi_options::speed, STRING_HEADER, sysclk_get_cpu_hz(), sysclk_get_peripheral_hz(), sysclk_init(), TEST_DATA_LENGTH, TWI_CLK, twi_get_pdc_base(), twi_master_init(), twi_master_pdc_read(), twi_master_pdc_write(), TWI_SUCCESS, and WAIT_TIME.

static void mdelay ( uint32_t ul_dly_ticks )

static

Wait for the given number of milliseconds (using the dwTimeStamp generated by the SAM microcontrollers' system tick).

Parameters

ul_dly_ticks Delay to wait for, in milliseconds.

References g_ul_ms_ticks.

Referenced by main().

void SysTick_Handler ( void )

Handler for System Tick interrupt.

Process System Tick Event increments the timestamp counter.

static void twi_master_pdc_read	(	Twi *	p_twi,
		twi_packet_t *	p_packet
	)

static

Read multiple bytes from a TWI compatible slave device.

Parameters

p_twi	Pointer to a TWI instance.
p_packet	Packet information and data (see twi_packet_t).

References twi_packet::addr, twi_packet::addr_length, twi_packet::buffer, twi_packet::chip, twi_packet::length, NULL, pdc_disable_transfer(), pdc_enable_transfer(), pdc_rx_init(), twi_enable_interrupt(), twi_mk_addr(), twi_read_status(), pdc_packet::ul_addr, and pdc_packet::ul_size.

Referenced by main().

static void twi_master_pdc_write	(	Twi *	p_twi,
		twi_packet_t *	p_packet
	)

static

Write multiple bytes to a TWI compatible slave device.

Parameters

p_twi	Pointer to a TWI instance.
p_packet	Packet information and data (see twi_packet_t).

References twi_packet::addr, twi_packet::addr_length, twi_packet::buffer, twi_packet::chip, twi_packet::length, NULL, pdc_disable_transfer(), pdc_enable_transfer(), pdc_tx_init(), twi_enable_interrupt(), twi_mk_addr(), twi_read_status(), pdc_packet::ul_addr, and pdc_packet::ul_size.

Referenced by main().

static uint32_t twi_read_status ( Twi * p_twi )

inlinestatic

Read status register.

Parameters

p_twi Pointer to an TWI instance.

Returns: TWI status register value.

Referenced by twi_master_pdc_read(), and twi_master_pdc_write().

Pdc* g_p_twim_pdc

volatile uint32_t g_ul_ms_ticks = 0

Global timestamp in milliseconds since start of application.

Referenced by delay_ms(), mdelay(), SysTick_Handler(), and toggle_led_test().

uint8_t gs_uc_test_data_rx[TEST_DATA_LENGTH] = { 0 }

static

Reception buffer.

Referenced by main().

twi_packet_t packet_rx

Referenced by main().

twi_packet_t packet_tx

Define TX and RX packet.

Referenced by main().

volatile uint32_t Read_Interrupt_Flag = 0

const volatile uint8_t test_data_tx[]

static

Initial value:

= {
    
    'S', 'A', 'M', ' ', 'T', 'W', 'I', ' ',
    'E', 'E', 'P', 'R', 'O', 'M', ' ',
    'E', 'X', 'A', 'M', 'P', 'L', 'E'
}

volatile uint32_t Write_Interrupt_Flag = 0

Define interrupt flag.

Microchip® Advanced Software Framework

Macros

Functions

Variables