altos: Generate unmodulated carrier for CC1120 test mode

This sets the deviation to 0, enables the preamble and turns on the
transmitter. It will sit there happily sending a bare carrier forever

Signed-off-by: Keith Packard <keithp@keithp.com>

2 files changed, 42 insertions, 2 deletions

diff --git a/src/drivers/ao_cc1120.c b/src/drivers/ao_cc1120.c
index 772014ee..37d04927 100644
--- a/src/drivers/ao_cc1120.c
+++ b/src/drivers/ao_cc1120.c
@@ -326,6 +326,8 @@ static const uint16_t packet_setup[] = {
 				 (0 << CC1120_PKT_CFG0_PKG_BIT_LEN) |
 				 (0 << CC1120_PKT_CFG0_UART_MODE_EN) |
 				 (0 << CC1120_PKT_CFG0_UART_SWAP_EN)),
+        CC1120_PREAMBLE_CFG1,	((CC1120_PREAMBLE_CFG1_NUM_PREAMBLE_4_BYTES << CC1120_PREAMBLE_CFG1_NUM_PREAMBLE) |
+				 (CC1120_PREAMBLE_CFG1_PREAMBLE_WORD_AA << CC1120_PREAMBLE_CFG1_PREAMBLE_WORD)),
 	AO_CC1120_MARC_GPIO_IOCFG,		CC1120_IOCFG_GPIO_CFG_MARC_MCU_WAKEUP,
 };
 
@@ -389,6 +391,8 @@ static const uint16_t rdf_setup[] = {
 				 (0 << CC1120_PKT_CFG0_PKG_BIT_LEN) |
 				 (0 << CC1120_PKT_CFG0_UART_MODE_EN) |
 				 (0 << CC1120_PKT_CFG0_UART_SWAP_EN)),
+        CC1120_PREAMBLE_CFG1,	((CC1120_PREAMBLE_CFG1_NUM_PREAMBLE_NONE << CC1120_PREAMBLE_CFG1_NUM_PREAMBLE) |
+				 (CC1120_PREAMBLE_CFG1_PREAMBLE_WORD_AA << CC1120_PREAMBLE_CFG1_PREAMBLE_WORD)),
 };
 
 /*
@@ -433,6 +437,33 @@ static const uint16_t aprs_setup[] = {
 				 (CC1120_PKT_CFG1_ADDR_CHECK_CFG_NONE << CC1120_PKT_CFG1_ADDR_CHECK_CFG) |
 				 (CC1120_PKT_CFG1_CRC_CFG_DISABLED << CC1120_PKT_CFG1_CRC_CFG) |
 				 (0 << CC1120_PKT_CFG1_APPEND_STATUS)),
+        CC1120_PREAMBLE_CFG1,	((CC1120_PREAMBLE_CFG1_NUM_PREAMBLE_NONE << CC1120_PREAMBLE_CFG1_NUM_PREAMBLE) |
+				 (CC1120_PREAMBLE_CFG1_PREAMBLE_WORD_AA << CC1120_PREAMBLE_CFG1_PREAMBLE_WORD)),
+};
+
+/*
+ * For Test mode, we want an unmodulated carrier. To do that, we
+ * set the deviation to zero and enable a preamble so that the radio
+ * turns on before we send any data
+ */
+
+static const uint16_t test_setup[] = {
+	CC1120_DEVIATION_M,	0,
+	CC1120_MODCFG_DEV_E,	((CC1120_MODCFG_DEV_E_MODEM_MODE_NORMAL << CC1120_MODCFG_DEV_E_MODEM_MODE) |
+				 (CC1120_MODCFG_DEV_E_MOD_FORMAT_2_GFSK << CC1120_MODCFG_DEV_E_MOD_FORMAT) |
+				 (0 << CC1120_MODCFG_DEV_E_DEV_E)),
+	CC1120_DRATE2,		((APRS_DRATE_E << CC1120_DRATE2_DATARATE_E) |
+				 (((APRS_DRATE_M >> 16) & CC1120_DRATE2_DATARATE_M_19_16_MASK) << CC1120_DRATE2_DATARATE_M_19_16)),
+	CC1120_DRATE1,		((APRS_DRATE_M >> 8) & 0xff),
+	CC1120_DRATE0,		((APRS_DRATE_M >> 0) & 0xff),
+	CC1120_PKT_CFG2,	((CC1120_PKT_CFG2_CCA_MODE_ALWAYS_CLEAR << CC1120_PKT_CFG2_CCA_MODE) |
+				 (CC1120_PKT_CFG2_PKT_FORMAT_NORMAL << CC1120_PKT_CFG2_PKT_FORMAT)),
+	CC1120_PKT_CFG1,	((0 << CC1120_PKT_CFG1_WHITE_DATA) |
+				 (CC1120_PKT_CFG1_ADDR_CHECK_CFG_NONE << CC1120_PKT_CFG1_ADDR_CHECK_CFG) |
+				 (CC1120_PKT_CFG1_CRC_CFG_DISABLED << CC1120_PKT_CFG1_CRC_CFG) |
+				 (0 << CC1120_PKT_CFG1_APPEND_STATUS)),
+        CC1120_PREAMBLE_CFG1,	((CC1120_PREAMBLE_CFG1_NUM_PREAMBLE_4_BYTES << CC1120_PREAMBLE_CFG1_NUM_PREAMBLE) |
+				 (CC1120_PREAMBLE_CFG1_PREAMBLE_WORD_AA << CC1120_PREAMBLE_CFG1_PREAMBLE_WORD)),
 };
 
 #define AO_PKT_CFG0_INFINITE ((0 << CC1120_PKT_CFG0_RESERVED7) |	\
@@ -456,8 +487,9 @@ static uint16_t ao_radio_mode;
 #define AO_RADIO_MODE_BITS_PACKET_RX	16
 #define AO_RADIO_MODE_BITS_RDF		32
 #define AO_RADIO_MODE_BITS_APRS		64
-#define AO_RADIO_MODE_BITS_INFINITE	128
-#define AO_RADIO_MODE_BITS_FIXED	256
+#define AO_RADIO_MODE_BITS_TEST		128
+#define AO_RADIO_MODE_BITS_INFINITE	256
+#define AO_RADIO_MODE_BITS_FIXED	512
 
 #define AO_RADIO_MODE_NONE		0
 #define AO_RADIO_MODE_PACKET_TX_BUF	(AO_RADIO_MODE_BITS_PACKET | AO_RADIO_MODE_BITS_PACKET_TX | AO_RADIO_MODE_BITS_TX_BUF)
@@ -467,6 +499,7 @@ static uint16_t ao_radio_mode;
 #define AO_RADIO_MODE_APRS_BUF		(AO_RADIO_MODE_BITS_APRS | AO_RADIO_MODE_BITS_INFINITE | AO_RADIO_MODE_BITS_TX_BUF)
 #define AO_RADIO_MODE_APRS_LAST_BUF	(AO_RADIO_MODE_BITS_APRS | AO_RADIO_MODE_BITS_FIXED | AO_RADIO_MODE_BITS_TX_BUF)
 #define AO_RADIO_MODE_APRS_FINISH	(AO_RADIO_MODE_BITS_APRS | AO_RADIO_MODE_BITS_FIXED | AO_RADIO_MODE_BITS_TX_FINISH)
+#define AO_RADIO_MODE_TEST		(AO_RADIO_MODE_BITS_TEST | AO_RADIO_MODE_BITS_INFINITE | AO_RADIO_MODE_BITS_TX_BUF)
 
 static void
 ao_radio_set_mode(uint16_t new_mode)
@@ -504,6 +537,10 @@ ao_radio_set_mode(uint16_t new_mode)
 		for (i = 0; i < sizeof (aprs_setup) / sizeof (aprs_setup[0]); i += 2)
 			ao_radio_reg_write(aprs_setup[i], aprs_setup[i+1]);
 
+	if (changes & AO_RADIO_MODE_BITS_TEST)
+		for (i = 0; i < sizeof (test_setup) / sizeof (test_setup[0]); i += 2)
+			ao_radio_reg_write(test_setup[i], test_setup[i+1]);
+
 	if (changes & AO_RADIO_MODE_BITS_INFINITE)
 		ao_radio_reg_write(CC1120_PKT_CFG0, AO_PKT_CFG0_INFINITE);
 
@@ -652,6 +689,7 @@ ao_radio_test_cmd(void)
 		ao_packet_slave_stop();
 #endif
 		ao_radio_get(0xff);
+		ao_radio_set_mode(AO_RADIO_MODE_TEST);
 		ao_radio_strobe(CC1120_STX);
 #if CC1120_TRACE
 		{ int t; 
diff --git a/src/drivers/ao_cc1120.h b/src/drivers/ao_cc1120.h
index 5d226b64..a1d78c01 100644
--- a/src/drivers/ao_cc1120.h
+++ b/src/drivers/ao_cc1120.h
@@ -404,6 +404,8 @@
 #define CC1120_MARC_SPARE	(CC1120_EXTENDED_BIT | 0x03)
 #define CC1120_ECG_CFG		(CC1120_EXTENDED_BIT | 0x04)
 #define CC1120_SOFT_TX_DATA_CFG	(CC1120_EXTENDED_BIT | 0x05)
+#define  CC1120_SOFT_TX_DATA_CFG_SYMBOL_MAP_CFG		5
+#define  CC1120_SOFT_TX_DATA_CFG_SOFT_TX_DATA_EN	0
 #define CC1120_EXT_CTRL		(CC1120_EXTENDED_BIT | 0x06)
 #define CC1120_RCCAL_FINE	(CC1120_EXTENDED_BIT | 0x07)
 #define CC1120_RCCAL_COARSE	(CC1120_EXTENDED_BIT | 0x08)