bool eep_read(eep_address_t eeprom_address, uint8_t *data_buffer_ptr, eep_length_t length) {
/* Perform sanity checks. */
if (EEP_SOURCE_UNSUPPORTED == eep_source) { return false; }
if (NULL == data_buffer_ptr) { return false; }
if (0 == length) { return false; }
if (EEP_SOURCE_EXTERNAL == eep_source) {
return at24cxx_read_continuous(eeprom_address, length, data_buffer_ptr);
} else {
do {
EEGET(*data_buffer_ptr, eeprom_address);
data_buffer_ptr++;
eeprom_address++;
length--;
} while (0 != length);
return true;
}
}
/**
* \brief Application entry point for AT24CXX Component Example.
*
* \return Unused (ANSI-C compatibility).
*/
int main(void)
{
uint32_t i;
twi_options_t opt;
/* Initialize the SAM system */
sysclk_init();
/* Initialize the board */
board_init();
/* Turn off LEDs */
ioport_set_pin_level(LED0_GPIO, LED0_INACTIVE_LEVEL);
ioport_set_pin_level(LED1_GPIO, LED1_INACTIVE_LEVEL);
/* Initialize the console UART */
configure_console();
/* Output example information */
puts(STRING_HEADER);
/* Configure the options of TWI driver */
opt.master_clk = sysclk_get_cpu_hz();
opt.speed = AT24C_TWI_CLK;
if (twi_master_setup(BOARD_AT24C_TWI_INSTANCE, &opt) != TWI_SUCCESS) {
puts("AT24CXX initialization is failed.\r");
ioport_set_pin_level(LED0_GPIO, LED0_ACTIVE_LEVEL);
ioport_set_pin_level(LED1_GPIO, LED1_ACTIVE_LEVEL);
while (1) {
/* Capture error */
}
}
/* Fill EEPROM with memory pattern */
if (at24cxx_fill_pattern(AT24C_MEM_ADDR,
AT24C_MEM_ADDR + TEST_DATA_LENGTH - 1,
MEMORY_PATTERN) != AT24C_WRITE_SUCCESS) {
puts("AT24CXX pattern fill is failed.\r");
ioport_set_pin_level(LED0_GPIO, LED0_ACTIVE_LEVEL);
ioport_set_pin_level(LED1_GPIO, LED1_ACTIVE_LEVEL);
while (1) {
/* Capture error */
}
}
if (at24cxx_read_continuous(AT24C_MEM_ADDR, TEST_DATA_LENGTH,
test_data_rx) != AT24C_READ_SUCCESS) {
puts("AT24CXX read packet is failed.\r");
ioport_set_pin_level(LED0_GPIO, LED0_ACTIVE_LEVEL);
ioport_set_pin_level(LED1_GPIO, LED1_ACTIVE_LEVEL);
while (1) {
/* Capture error */
}
}
/* Compare the sent and the received */
for (i = 0; i < TEST_DATA_LENGTH; i++) {
if (MEMORY_PATTERN != test_data_rx[i]) {
/* No match */
puts("Pattern comparison: Unmatched!\r");
ioport_set_pin_level(LED0_GPIO, LED0_ACTIVE_LEVEL);
ioport_set_pin_level(LED1_GPIO, LED1_ACTIVE_LEVEL);
while (1) {
/* Capture error */
}
}
}
puts("Pattern comparison: Matched!\r");
/* Send test pattern to EEPROM */
if (at24cxx_write_continuous(AT24C_MEM_ADDR, TEST_DATA_LENGTH,
test_data_tx) != AT24C_WRITE_SUCCESS) {
puts("AT24CXX write packet is failed.\r");
ioport_set_pin_level(LED0_GPIO, LED0_ACTIVE_LEVEL);
ioport_set_pin_level(LED1_GPIO, LED1_ACTIVE_LEVEL);
while (1) {
/* Capture error */
}
}
/* Get memory from EEPROM */
if (at24cxx_read_continuous(AT24C_MEM_ADDR, TEST_DATA_LENGTH,
test_data_rx) != AT24C_READ_SUCCESS) {
puts("AT24CXX read packet is failed.\r");
ioport_set_pin_level(LED0_GPIO, LED0_ACTIVE_LEVEL);
ioport_set_pin_level(LED1_GPIO, LED1_ACTIVE_LEVEL);
while (1) {
/* Capture error */
}
}
/* Compare the sent and the received */
for (i = 0; i < TEST_DATA_LENGTH; i++) {
if (test_data_tx[i] != test_data_rx[i]) {
/* No match */
puts("Data comparison: Unmatched!\r");
ioport_set_pin_level(LED0_GPIO, LED0_ACTIVE_LEVEL);
ioport_set_pin_level(LED1_GPIO, LED1_ACTIVE_LEVEL);
while (1) {
/* Capture error */
}
}
}
/* Match */
puts("Data comparison: Matched!\r");
/* Page Operation */
for (i = 0; i < PAGE_SIZE; i++) {
page_read_buf[i] = 0;
page_write_buf[i] = i;
}
if (at24cxx_write_page(PAGE_ADDR, PAGE_SIZE, page_write_buf) !=
AT24C_WRITE_SUCCESS) {
puts("AT24CXX page write is failed.\r");
ioport_set_pin_level(LED0_GPIO, LED0_ACTIVE_LEVEL);
ioport_set_pin_level(LED1_GPIO, LED1_ACTIVE_LEVEL);
while (1) {
/* Capture error */
}
}
if (at24cxx_read_page(PAGE_ADDR, PAGE_SIZE, page_read_buf) !=
AT24C_READ_SUCCESS) {
puts("AT24CXX page read is failed.\r");
ioport_set_pin_level(LED0_GPIO, LED0_ACTIVE_LEVEL);
ioport_set_pin_level(LED1_GPIO, LED1_ACTIVE_LEVEL);
while (1) {
/* Capture error */
}
}
for (i = 0; i < PAGE_SIZE; i++) {
if (page_read_buf[i] != page_write_buf[i]) {
/* No match */
puts("Page comparison: Unmatched!\r");
ioport_set_pin_level(LED0_GPIO, LED0_ACTIVE_LEVEL);
ioport_set_pin_level(LED1_GPIO, LED1_ACTIVE_LEVEL);
while (1) {
/* Capture error */
}
}
}
/* Match */
puts("Page comparison: Matched!\r");
while (1) {
}
}