twihs_master_example.c File Reference

TWIHS MASTER Example for SAM.

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

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

Macros
#define	AT24C_ADDRESS   0x50
	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	TWIHS_CLK   400000
	TWI Bus Clock 400kHz. More...
#define	WAIT_TIME   10
	EEPROM Wait Time. More...

Functions
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...

Variables
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...
static const uint8_t	test_data_tx []

#define AT24C_ADDRESS   0x50

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:

"--TWIHS MASTER 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 TWIHS_CLK   400000

TWI Bus Clock 400kHz.

Referenced by main().

#define WAIT_TIME   10

EEPROM Wait Time.

Referenced by main().

static void configure_console ( void  )

static

Configure the Console UART.

References uart_rs232_options::baudrate, CONF_UART, CONF_UART_BAUDRATE, CONF_UART_CHAR_LENGTH, CONF_UART_PARITY, CONF_UART_STOP_BITS, CONSOLE_UART_ID, 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 twihs_packet::addr, twihs_packet::addr_length, AT24C_ADDRESS, board_init(), twihs_packet::buffer, twihs_packet::chip, configure_console(), EEPROM_MEM_ADDR, EEPROM_MEM_ADDR_LENGTH, gs_uc_test_data_rx, LED_Off, LED_On, twihs_packet::length, twihs_options::master_clk, mdelay(), pmc_enable_periph_clk(), twihs_options::speed, STRING_HEADER, sysclk_get_cpu_hz(), sysclk_get_peripheral_hz(), sysclk_init(), TEST_DATA_LENGTH, TWIHS_CLK, twihs_master_init(), twihs_master_read(), twihs_master_write(), TWIHS_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.

volatile uint32_t g_ul_ms_ticks = 0

Global timestamp in milliseconds since start of application.

Referenced by mdelay().

uint8_t gs_uc_test_data_rx[TEST_DATA_LENGTH] = { 0 }

static

Reception buffer.

Referenced by main().

const 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'
}