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Sample code to read the MAC address on a Nanode V5.
// Nanode_MAC
// Rufus Cable, June 2011 (threebytesfull)
// Sample code to read the MAC address from the 11AA02E48 on the
// back of the Nanode V5 board.
// This code is hacky and basic - it doesn't check for bus errors
// and will probably fail horribly if it's interrupted. It's best
// run in setup() - fetch the MAC address once and keep it. After
// the address is fetched, it puts the chip back in standby mode
// in which it apparently only consumes 1uA.
// Feel free to reuse this code - suggestions for improvement are
// welcome! :)
// BITS 7 6 5 4 3 2 1 0
// PORTD = D7 D6 D5 D4 D3 D2 D1 D0
// PORTB = - - D13 D12 D11 D10 D9 D8
// Nanode has UNI/O SCIO on DIG7
#define D7_ON (1<<7)
#define D7_OFF (~D7_ON)
#define SCIO_HIGH PORTD |= D7_ON
#define SCIO_LOW PORTD &= D7_OFF
#define SCIO_OUTPUT DDRD |= D7_ON
#define SCIO_INPUT DDRD &= D7_OFF
#define SCIO_READ ((PIND & D7_ON) != 0)
#define WAIT_QUARTER_BIT delayMicroseconds(9);
#define WAIT_HALF_BIT delayMicroseconds(20);
#define NOP PORTD &= 0xff
byte mac_address[6] = {0, 0, 0, 0, 0, 0};
// Fixed Timings
// standby pulse time (600us+)
#define UNIO_TSTBY_US 600
// start header setup time (10us+)
#define UNIO_TSS_US 10
// start header low pulse (5us+)
#define UNIO_THDR_US 6
// SCIO Manipulation macros
#define BIT0 SCIO_HIGH;WAIT_HALF_BIT;SCIO_LOW;WAIT_HALF_BIT;
#define BIT1 SCIO_LOW;WAIT_HALF_BIT;SCIO_HIGH;WAIT_HALF_BIT;
void unio_standby() {
SCIO_OUTPUT;
SCIO_HIGH;
delayMicroseconds(UNIO_TSTBY_US);
}
void unio_start_header() {
SCIO_LOW;
delayMicroseconds(UNIO_THDR_US);
unio_sendByte(B01010101);
}
void unio_sendByte(byte data) {
SCIO_OUTPUT;
for (int i=0; i<8; i++) {
if (data & 0x80) {
BIT1;
} else {
BIT0;
}
data <<= 1;
}
// MAK
BIT1;
// SAK?
bool sak = unio_readBit();
}
byte unio_readBytes(byte *addr, unsigned int length) {
for (int i=0; i<length; i++) {
byte data = 0;
for (int b=0; b<8; b++) {
data = (data << 1) | (unio_readBit() ? 1 : 0);
}
SCIO_OUTPUT;
if (i==length-1) {
BIT0; // NoMAK
} else {
BIT1; // MAK
}
bool sak = unio_readBit();
addr[i] = data;
}
}
inline bool unio_readBit()
{
SCIO_INPUT;
WAIT_QUARTER_BIT;
bool value1 = SCIO_READ;
WAIT_HALF_BIT;
bool value2 = SCIO_READ;
WAIT_QUARTER_BIT;
return (value2 && !value1);
}
void setup() {
Serial.begin(9600);
Serial.println("MAC Address Read Test");
// standby
unio_standby();
// start header
unio_start_header();
// address A0
unio_sendByte(0xA0);
// 0x3 READ
unio_sendByte(0x03);
// word address MSB 0x00
unio_sendByte(0x00);
// word address LSB 0xFA
unio_sendByte(0xFA);
// read 6 bytes
unio_readBytes(mac_address, 6);
// back to standby
unio_standby();
Serial.print("MAC address is ");
for (int i=0; i<6; i++) {
if (mac_address[i]<16) {
Serial.print("0");
}
Serial.print(mac_address[i], HEX);
if (i<5) {
Serial.print(":");
} else {
Serial.println("");
}
}
}
void loop() {
while (1) {}
}
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