spi_flash: support spi protocol changes

Signed-off-by:  Eric Callahan <arksine.code@gmail.com>

scripts/spi_flash/spi_flash.py

@@ -104,7 +104,10 @@ GET_CFG_RESPONSES = ( # Supported responses (sorted by newer revisions first).
     "config is_config=%c crc=%u move_count=%hu is_shutdown=%c"  # Original
 )
 ALLOC_OIDS_CMD = "allocate_oids count=%d"
-SPI_CFG_CMD = "config_spi oid=%d pin=%s"
+SPI_CFG_CMDS = (
+    "config_spi oid=%d pin=%s cs_active_high=%d",   # 7793784
+    "config_spi oid=%d pin=%s"                      # Original
+)
 SPI_BUS_CMD = "spi_set_bus oid=%d spi_bus=%s mode=%d rate=%d"
 SW_SPI_BUS_CMD = "spi_set_software_bus oid=%d " \
     "miso_pin=%s mosi_pin=%s sclk_pin=%s mode=%d rate=%d"
@@ -794,6 +797,7 @@ class MCUConnection:
         self.connected = False
         self.enumerations = {}
         self.raw_dictionary = None
+        self.proto_error = None
 
     def connect(self):
         output("Connecting to MCU..")
@@ -821,6 +825,7 @@ class MCUConnection:
                 % (build_mcu_type, mcu_type))
         self.enumerations = msgparser.get_enumerations()
         self.raw_dictionary = msgparser.get_raw_data_dictionary()
+        self.proto_error = msgparser.error
 
     def _do_serial_connect(self, eventtime):
         endtime = eventtime + 60.
@@ -903,15 +908,24 @@ class MCUConnection:
             bus_cmd = SPI_BUS_CMD % (SPI_OID, bus, SPI_MODE, SD_SPI_SPEED)
         if cs_pin not in pin_enums:
             raise SPIFlashError("Invalid CS Pin: %s" % (cs_pin,))
-        cfg_cmds = [
-            ALLOC_OIDS_CMD % (1),
-            SPI_CFG_CMD % (SPI_OID, cs_pin),
-            bus_cmd,
+        cfg_cmds = [ALLOC_OIDS_CMD % (1,), bus_cmd]
+        self._serial.send(cfg_cmds[0])
+        spi_cfg_cmds = [
+            SPI_CFG_CMDS[0] % (SPI_OID, cs_pin, False),
+            SPI_CFG_CMDS[1] % (SPI_OID, cs_pin),
         ]
+        for cmd in spi_cfg_cmds:
+            try:
+                self._serial.send(cmd)
+            except self.proto_error:
+                if cmd == spi_cfg_cmds[-1]:
+                    raise
+            else:
+                cfg_cmds.insert(1, cmd)
+                break
+        self._serial.send(bus_cmd)
         config_crc = zlib.crc32('\n'.join(cfg_cmds).encode()) & 0xffffffff
-        cfg_cmds.append(FINALIZE_CFG_CMD % (config_crc,))
-        for cmd in cfg_cmds:
-            self._serial.send(cmd)
+        self._serial.send(FINALIZE_CFG_CMD % (config_crc,))
         self.fatfs = FatFS(self._serial)
         self.reactor.pause(self.reactor.monotonic() + .5)
         printfunc("Initializing SD Card and Mounting file system...")