Add device auto detection to detect ECC devices

* Detects ATECC508A & ATECC608A
* Detects unconfigured devices

Author: bryan-hunt

scripts/at_kit_base.py

@@ -11,6 +11,7 @@
 DEVICE_HID_PID = 0x2312
 KIT_VERSION = "2.0.0"
 
+KIT_APP_COMMAND_SET_TIME = 0
 
 def kit_crc(data):
     """Return bytes object of the crc based on the input data bytes"""

src/atca_kit_client.c

@@ -179,19 +179,46 @@ ATCA_STATUS atca_kit_detect_I2c_devices()
 {
 	ATCA_STATUS status = ATCA_NO_DEVICES;
 	uint8_t revision[4];
+	uint8_t i;
 
 	status = atcab_init( &cfg_ateccx08a_i2c_default );
-	if (status != ATCA_SUCCESS) return status;
+	for (i=0xB0; i<0xC8 && status; i+=2)
+	{
+		cfg_ateccx08a_i2c_default.atcai2c.slave_address = i;
+		status = atcab_init( &cfg_ateccx08a_i2c_default );
+	}
+
+	/* If the loop terminated before finding a device */
+	if (status != ATCA_SUCCESS)
+	{
+		return status;
+	}
 
-	// Test the init
+	/* Verify the device by retrieving the revision */
 	status = atcab_info(revision);
-	if (status != ATCA_SUCCESS) {
+	if (status != ATCA_SUCCESS)
+	{
 		return status;
 	}
 
 	device_info[device_count].address = cfg_ateccx08a_i2c_default.atcai2c.slave_address;
 	device_info[device_count].bus_type = DEVKIT_IF_I2C;
-	device_info[device_count].device_type = DEVICE_TYPE_ECC508A;
+
+	switch(revision[2])
+	{
+		case 0x50:
+			device_info[device_count].device_type = DEVICE_TYPE_ECC508A;
+			cfg_ateccx08a_i2c_default.devtype = ATECC508A;
+			break;
+		case 0x60:
+			device_info[device_count].device_type = DEVICE_TYPE_ECC608A;
+			cfg_ateccx08a_i2c_default.devtype = ATECC608A;
+			break;
+		default:
+			device_info[device_count].device_type = DEVICE_TYPE_ECC108A;
+			break;
+	}
+	
 	memcpy(device_info[device_count].dev_rev, revision, sizeof(revision));
 
 	device_count++;

src/config.c

@@ -33,6 +33,7 @@
 #include "config.h"
 #include "time_utils.h"
 #include "jwt/atca_jwt.h"
+#include "atca_kit_client.h"
 
 #ifdef CONFIG_USE_STATIC_CONFIG
 
@@ -54,7 +55,8 @@ const char config_gcp_thing_id[] = "<EXAMPLE_DEVICE_ID>";
 
 void config_crypto(void)
 {
-    cfg_ateccx08a_i2c_default.atcai2c.slave_address  = 0xB0;
+	/* Configure the default I2C address of the device */
+	cfg_ateccx08a_i2c_default.atcai2c.slave_address = 0xB0;
 
 #if BOARD == SAMW25_XPLAINED_PRO
     /* For the ATSAMW25-XPRO Development Board */
@@ -63,6 +65,9 @@ void config_crypto(void)
     /* For the ATSAMG55-XPRO Development board */
     cfg_ateccx08a_i2c_default.atcai2c.bus = 1;
 #endif
+
+	/* Detect devices */
+	(void)atca_kit_detect_I2c_devices();
 }
 
 bool config_ready(void)