atusd firmware now supports setting the TST pin.

- common/io.h: TST is connected to P0_7
- include/at86rf230.h: added test mode registers REG_CONT_TX_0 (0x36) and
  REG_CONT_TX_1 (0x3d), with their values
- atspi/atspi.c (set_test_mode): set or reset TST and the LED
- atspi/atspi.c (reset_rf): leave test mode
- atspi/atspi.c (test_mode): enter test mode
- atspi/atspi.c (main): flash the LED when in test mode
- include/atspi/ep0.h (enum atspi_requests), atspi/ep0.c (my_setup): new
  command ATSPI_TEST to enter test mode
- include/atspi/ep0.h (EP0ATSPI_MINOR): bumped protocol to version 0.1
- include/at86rf230.h: corrected comment before TRX_CMD field to indicate
  that the register is called TRX_STATE

atusb/fw/include/at86rf230.h

@@ -67,6 +67,9 @@ enum {
 	REG_XAH_CTRL		= 0x2c,
 	REG_CSMA_SEED_0		= 0x2d,
 	REG_CSMA_SEED_1		= 0x2e,
+
+	REG_CONT_TX_0		= 0x36,
+	REG_CONT_TX_1		= 0x3d,
 };
 
 /* --- TRX_STATUS [7] ------------------------------------------------------ */
@@ -113,7 +116,7 @@ enum {
 	TRAC_STATUS_INVALID			= 7
 };
 
-/* --- TRX_CMD [4:0] ----------------------------------------------------- */
+/* --- TRX_STATE [4:0] ----------------------------------------------------- */
 
 #define	TRX_CMD_SHIFT	0
 #define	TRX_CMD_MASK	7
@@ -285,4 +288,15 @@ enum {
 #define CSMA_SEED_1_SHIFT	0
 #define	CSMA_SEED_1_MASK	7
 
+/* --- REG_CONT_TX_0 [7:0] ------------------------------------------------- */
+
+#define	CONT_TX_MAGIC		0x0f
+
+/* --- REG_CONT_TX_1 [7:0] ------------------------------------------------- */
+
+#define	CONT_TX_MOD		0x00	/* modulated */
+#define	CONT_TX_M2M		0x10	/* f_CH-2 MHz */
+#define	CONT_TX_M500K		0x80	/* f_CH-0.5 MHz */
+#define	CONT_TX_P500K		0xc0	/* f_CH+0.5 MHz */
+
 #endif /* !AT86RF230_H */