rp2/boards/make-pins.py: Pass num-gpios/num-ext-gpios into make-pins.

NUM_GPIOS amd NUM_EXT_GPIOS are currently hardcoded in make-pins.py, which
makes it difficult to support SoCs with different pin count.

This commit generalises make-pins.py by passing in the pin count in via the
new arguments `--num-gpios` and `--num-ext-gpios`.  These default to the
current values supported by Pico, namely 30/10.  This can be changed with
PICO_NUM_GPIOS and PICO_NUM_EXT_GPIOS in `mpconfigboard.cmake`.

Signed-off-by: Damien George <damien@micropython.org>

Author: peterharperuk

ports/rp2/CMakeLists.txt

@@ -588,6 +588,14 @@ set(GEN_PINS_MKPINS "${MICROPY_PORT_DIR}/boards/make-pins.py")
 set(GEN_PINS_SRC "${CMAKE_BINARY_DIR}/pins_${MICROPY_BOARD}.c")
 set(GEN_PINS_HDR "${MICROPY_GENHDR_DIR}/pins.h")
 
+if(NOT PICO_NUM_GPIOS)
+    set(PICO_NUM_GPIOS 30)
+endif()
+
+if(NOT PICO_NUM_EXT_GPIOS)
+    set(PICO_NUM_EXT_GPIOS 10)
+endif()
+
 if(EXISTS "${MICROPY_BOARD_DIR}/pins.csv")
     set(GEN_PINS_BOARD_CSV "${MICROPY_BOARD_DIR}/pins.csv")
     set(GEN_PINS_CSV_ARG --board-csv "${GEN_PINS_BOARD_CSV}")
@@ -600,7 +608,7 @@ target_sources(${MICROPY_TARGET} PRIVATE
 # Generate pins
 add_custom_command(
     OUTPUT ${GEN_PINS_HDR} ${GEN_PINS_SRC}
-    COMMAND ${Python3_EXECUTABLE} ${GEN_PINS_MKPINS} ${GEN_PINS_CSV_ARG} --af-csv ${GEN_PINS_AF_CSV} --prefix ${GEN_PINS_PREFIX} --output-source ${GEN_PINS_SRC} --output-header ${GEN_PINS_HDR}
+    COMMAND ${Python3_EXECUTABLE} ${GEN_PINS_MKPINS} ${GEN_PINS_CSV_ARG} --af-csv ${GEN_PINS_AF_CSV} --prefix ${GEN_PINS_PREFIX} --output-source ${GEN_PINS_SRC} --num-gpios ${PICO_NUM_GPIOS} --num-ext-gpios ${PICO_NUM_EXT_GPIOS} --output-header ${GEN_PINS_HDR}
     DEPENDS
         ${GEN_PINS_AF_CSV}
         ${GEN_PINS_BOARD_CSV}

ports/rp2/boards/make-pins.py

@@ -9,9 +9,9 @@
 import boardgen
 
 # This is NUM_BANK0_GPIOS. Pin indices are 0 to 29 (inclusive).
-NUM_GPIOS = 48
+NUM_GPIOS = None
 # Up to 32 additional extended pins (e.g. via the wifi chip or io expanders).
-NUM_EXT_GPIOS = 32
+NUM_EXT_GPIOS = None
 
 
 class Rp2Pin(boardgen.Pin):
@@ -108,12 +108,6 @@ def __init__(self):
             enable_af=True,
         )
 
-        # Pre-define the pins (i.e. don't require them to be listed in pins.csv).
-        for i in range(NUM_GPIOS):
-            self.add_cpu_pin("GPIO{}".format(i))
-        for i in range(NUM_EXT_GPIOS):
-            self.add_cpu_pin("EXT_GPIO{}".format(i))
-
     # Provided by pico-sdk.
     def cpu_table_size(self):
         return "NUM_BANK0_GPIOS"
@@ -128,6 +122,31 @@ def print_source(self, out_source):
         super().print_source(out_source)
         self.print_cpu_locals_dict(out_source)
 
+    def extra_args(self, parser):
+        parser.add_argument("--num-gpios", type=int)
+        parser.add_argument("--num-ext-gpios", type=int)
+
+    def load_inputs(self, out_source):
+        global NUM_GPIOS
+        global NUM_EXT_GPIOS
+
+        # Needed by validate_cpu_pin_name
+        NUM_GPIOS = self.args.num_gpios
+        NUM_EXT_GPIOS = self.args.num_ext_gpios
+
+        if NUM_GPIOS is None:
+            raise boardgen.PinGeneratorError("Please pass num-gpios")
+
+        if NUM_EXT_GPIOS is None:
+            NUM_EXT_GPIOS = 0
+        # Pre-define the pins (i.e. don't require them to be listed in pins.csv).
+        for i in range(NUM_GPIOS):
+            self.add_cpu_pin("GPIO{}".format(i))
+        for i in range(NUM_EXT_GPIOS):
+            self.add_cpu_pin("EXT_GPIO{}".format(i))
+
+        super().load_inputs(out_source)
+
 
 if __name__ == "__main__":
     Rp2PinGenerator().main()