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ATSHA204 personalization sketch updated

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New default pin is A3.

New option to skip UART confirmation: SKIP_UART_CONFIRMATION
This option prohibits the possibility to auto-generate key as there
will probably not be a way to show the generated key to the user.

More copy+paste friendly serial output of the generated key for
insertion into personalization sketch.
This commit is contained in:
Patrick Fallberg
2015-02-16 22:30:50 +01:00
parent f796c677cd
commit 4d3fc96ebf
1 changed files with 33 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files
libraries/sha204/examples/sha204_personalizer/sha204_personalizer.ino
+33 -8
View File
@@ -15,14 +15,15 @@
By default, no locking is performed. User have to manually enable the flags that
turn on the locking. Furthermore, user have to send a SPACE character on serial
console when prompted to do any locking.
Default settings use ATSHA204 on pin 7.
console when prompted to do any locking. On boards that does not provide UART
input it is possible to configure the sketch to skip this confirmation.
Default settings use ATSHA204 on pin 17 (A3).
*/
#include <sha204_library.h>
#include <sha204_lib_return_codes.h>
// The pin the ATSHA204 is connected on
#define ATSHA204_PIN 7
#define ATSHA204_PIN 17 // A3
// Uncomment this to enable locking the configuration zone.
// *** BE AWARE THAT THIS PREVENTS ANY FUTURE CONFIGURATION CHANGE TO THE CHIP ***
@@ -44,11 +45,24 @@
// Uncomment this to skip key generation and use 'user_key_data' as key instead.
//#define USER_KEY_DATA
// Uncomment this for boards that lack UART
// IMPORTANT: No confirmation will be required for locking any zones with this
// configuration!
// Also, key generation is not permitted in this mode as there is no way of
// presenting the generated key.
//#define SKIP_UART_CONFIRMATION
#if defined(SKIP_UART_CONFIRMATION) && !defined(USER_KEY_DATA)
#error You have to define USER_KEY_DATA for boards that does not have UART
#endif
#ifdef USER_KEY_DATA
const uint8_t user_key_data[32] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
const uint8_t user_key_data[32] = {
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
};
#endif
const int sha204Pin = ATSHA204_PIN;
@@ -727,6 +741,7 @@ void setup()
#ifdef LOCK_CONFIGURATION
// Purge serial input buffer
#ifndef SKIP_UART_CONFIRMATION
while (Serial.available())
{
Serial.read();
@@ -735,6 +750,7 @@ void setup()
while (Serial.available() == 0);
if (Serial.read() == ' ')
#endif //not SKIP_UART_CONFIRMATION
{
Serial.println(F("Locking configuration..."));
@@ -773,10 +789,12 @@ void setup()
}
}
}
#ifndef SKIP_UART_CONFIRMATION
else
{
Serial.println(F("Unexpected answer. Skipping lock."));
}
#endif //not SKIP_UART_CONFIRMATION
#else //LOCK_CONFIGURATION
Serial.println(F("Dry-run. Configuration not locked. Define LOCK_CONFIGURATION to lock for real."));
#endif
@@ -793,7 +811,7 @@ void setup()
#else
#ifdef USER_KEY_DATA
memcpy(key, user_key_data, 32);
Serial.print(F("Using this user supplied key: "));
Serial.println(F("Using this user supplied key:"));
#else
// Retrieve random value to use as key
ret_code = sha204.sha204m_random(tx_buffer, rx_buffer, RANDOM_SEED_UPDATE);
@@ -817,11 +835,14 @@ void setup()
#endif
for (int i=0; i<32; i++)
{
Serial.print("0x");
if (key[i] < 0x10)
{
Serial.print('0'); // Because Serial.print does not 0-pad HEX
}
Serial.print(key[i], HEX);
if (i < 31) Serial.print(',');
if (!((i+1) % 8)) Serial.println();
}
Serial.println();
@@ -842,6 +863,7 @@ void setup()
if (lockValue != 0x00)
{
#ifdef LOCK_DATA
#ifndef SKIP_UART_CONFIRMATION
while (Serial.available())
{
Serial.read();
@@ -849,6 +871,7 @@ void setup()
Serial.println(F("Send SPACE character to lock data..."));
while (Serial.available() == 0);
if (Serial.read() == ' ')
#endif //not SKIP_UART_CONFIRMATION
{
// Correct sequence, resync chip
ret_code = sha204.sha204c_resync(SHA204_RSP_SIZE_MAX, rx_buffer);
@@ -907,10 +930,12 @@ void setup()
}
}
}
#ifndef SKIP_UART_CONFIRMATION
else
{
Serial.println(F("Unexpected answer. Skipping lock."));
}
#endif //not SKIP_UART_CONFIRMATION
#else //LOCK_DATA
Serial.println(F("Dry-run. Data not locked. Define LOCK_DATA to lock for real."));
#endif