added setter & getter for sync mode

cc1101/__init__.py

@@ -12,6 +12,7 @@ from cc1101.addresses import (
     StatusRegisterAddress,
     FIFORegisterAddress,
 )
+from cc1101.options import SyncMode
 
 
 _LOGGER = logging.getLogger(__name__)
@@ -237,6 +238,21 @@ class CC1101:
         mdmcfg2 |= 0b1000
         self._write_burst(ConfigurationRegisterAddress.MDMCFG2, [mdmcfg2])
 
+    def get_sync_mode(self) -> SyncMode:
+        mdmcfg2 = self._read_single_byte(ConfigurationRegisterAddress.MDMCFG2)
+        return SyncMode(mdmcfg2 & 0b11)
+
+    def set_sync_mode(self, mode: SyncMode) -> None:
+        """
+        MDMCFG2.SYNC_MODE
+
+        see "14.3 Byte Synchronization"
+        """
+        mdmcfg2 = self._read_single_byte(ConfigurationRegisterAddress.MDMCFG2)
+        mdmcfg2 &= 0b11111100
+        mdmcfg2 |= mode
+        self._write_burst(ConfigurationRegisterAddress.MDMCFG2, [mdmcfg2])
+
     def _set_power_amplifier_setting_index(self, setting_index: int) -> None:
         """
         FREND0.PA_POWER
@@ -350,11 +366,12 @@ class CC1101:
         )
 
     def __str__(self) -> str:
-        return "CC1101(marcstate={}, base_frequency={:.2f}MHz, symbol_rate={:.2f}kBaud, modulation_format={})".format(
+        return "CC1101(marcstate={}, base_frequency={:.2f}MHz, symbol_rate={:.2f}kBaud, modulation_format={}, sync_mode={})".format(
             self.get_main_radio_control_state_machine_state().name.lower(),
             self.get_base_frequency_hertz() / 10 ** 6,
             self.get_symbol_rate_baud() / 1000,
             self.get_modulation_format().name,
+            self.get_sync_mode().name,
         )
 
     def _get_packet_length(self) -> int:

cc1101/options.py

@@ -0,0 +1,14 @@
+import enum
+
+
+class SyncMode(enum.IntEnum):
+    """
+    MDMCFG2.SYNC_MODE
+    
+    see "14.3 Byte Synchronization"
+    """
+
+    NO_PREAMBLE_AND_SYNC_WORD = 0b00
+    TRANSMIT_16_MATCH_15_BITS = 0b01
+    TRANSMIT_16_MATCH_16_BITS = 0b10
+    TRANSMIT_32_MATCH_30_BITS = 0b11

examples/transmit.py

@@ -10,6 +10,7 @@ with cc1101.CC1101() as transceiver:
     print("defaults:", transceiver)
     transceiver.set_base_frequency_hertz(433.5e6)
     transceiver.set_symbol_rate_baud(600)
+    # transceiver.set_sync_mode(cc1101.SyncMode.NO_PREAMBLE_AND_SYNC_WORD)
     print(transceiver)
     print("state", transceiver.get_marc_state().name)
     print("base frequency", transceiver.get_base_frequency_hertz(), "Hz")