stm32/make-af-csv: Add tool to generate af csv files.

Uses official online source: github/STM32_open_pin_data.

Signed-off-by: Andrew Leech <[email protected]>

ports/stm32/boards/make-af-csv.py

@@ -0,0 +1,275 @@
+#!/usr/bin/env python
+"""
+Generates MCU alternate-function (AF) definition files for stm32 parts
+using the official sources from:
+https://github.com/STMicroelectronics/STM32_open_pin_data
+
+Usage:
+$ python3 make-af-csv.py <mcu_name>
+
+Example:
+$ python3 make-af-csv.py stm32wb55
+
+"""
+import json
+import re
+import sys
+import urllib.request
+import xml.etree.ElementTree as ET
+from collections import defaultdict
+from io import BytesIO
+from pathlib import Path
+
+
+# https://docs.github.com/en/rest/git/trees?apiVersion=2022-11-28#get-a-tree
+# Note this API has a limit of 60 (unauthenticated) requests per hour.
+repo_url = "https://api.github.com/repos/STMicroelectronics/STM32_open_pin_data/git/trees/"
+
+# Raw xml files can be downloaded here
+xml_url = "https://raw.githubusercontent.com/STMicroelectronics/STM32_open_pin_data/master/mcu/"
+
+
+mcu_list_all = None
+
+
+def generate_af_csv(target: str) -> None:
+    """
+    Generates an AF CSV file based on the given target.
+
+    Parameters:
+    - target (str): The mcu to generate the AF CSV for.
+
+    """
+    global mcu_list_all
+
+    print("Generating AF file for:", target)
+    cpu = target.rstrip("x").upper()
+
+    if mcu_list_all is None:
+        with urllib.request.urlopen(repo_url + "master") as response:
+            repo_list_all = json.load(response)["tree"]
+        mcu_list_url = [entry for entry in repo_list_all if entry["path"] == "mcu"][0]["url"]
+        with urllib.request.urlopen(mcu_list_url + "?recursive=1") as response:
+            mcu_list_all = json.load(response)["tree"]
+
+    # Get list of all mcu files matching the target
+    mcu_list = [mcu for mcu in mcu_list_all if mcu.get("path").upper().startswith(cpu)]
+    if not mcu_list:
+        raise SystemExit('ERROR: Could not find mcu "{}" on: \n{}'.format(cpu, mcu_list_url))
+
+    # Check the mcu definition files for one of the matching mcus,
+    # pick largest to include all possible pins.
+    gpio_file_url = None
+    mcu_xml_len = 0
+    mcu_url = None
+    for mcu in mcu_list:
+        mcu_xml_url = xml_url + mcu["path"]
+        with urllib.request.urlopen(mcu_xml_url) as response:
+            length = int(response.headers["content-length"])
+            if length > mcu_xml_len:
+                mcu_xml_len = length
+                mcu_url = mcu_xml_url
+
+    with urllib.request.urlopen(mcu_url) as response:
+        mcuxmlstr = response.read()
+    print("Downloaded:", mcu_url)
+
+    # The STM xml files have a dummy namespace declared which confuses ElementTree.
+    # This wrapper iter removes them.
+    it = ET.iterparse(BytesIO(mcuxmlstr))
+    for _, el in it:
+        _, _, el.tag = el.tag.rpartition("}")  # strip ns
+    root = it.root
+
+    # This mcu definition file declares which pins have ADC pins. Gather them now.
+    adc_pins = dict()
+    for pin in root.findall("./Pin"):
+        for sig in pin.findall("./Signal"):
+            sig_name = sig.get("Name")
+            if sig_name.startswith("ADC") and "_IN" in sig_name:
+                # On some parts they omit the 1 on the first ADC peripheral
+                sig_name = sig_name.replace("ADC_", "ADC1_")
+                index, channel = sig_name.split("_")
+                pname = pin_name(pin.get("Name"))
+                dual_pin = pin.get("Name").endswith("_C")
+                ptype = "C_ADC" if dual_pin else "ADC"
+                tc = (ptype, channel)
+                # Keep just the ADC index and IN channel.
+                n_index = re.search("\d+", index)[0]
+                if pname in adc_pins:
+                    if tc not in adc_pins[pname]:
+                        adc_pins[pname][tc] = n_index
+                    else:
+                        # Merge ADC unit together, eg ADC1 and ADC3 becomes ADC13
+                        adc_pins[pname][tc] = "".join(sorted(adc_pins[pname][tc] + n_index))
+                else:
+                    adc_pins[pname] = {tc: n_index}
+
+    # The mcu definition xml file includes a reference to the GPIO definition file
+    # matching the chip. This is the file with AF data.
+    for detail in root.findall("./IP[@Name='GPIO']"):
+        gpio_file = [
+            gpio
+            for gpio in mcu_list_all
+            if gpio["path"].startswith("IP/GPIO") and detail.get("Version") in gpio["path"]
+        ][0]
+        gpio_file_url = xml_url + gpio_file["path"]
+        break
+
+    if gpio_file_url is None:
+        raise SystemError("ERROR: Could not find GPIO details in {}".format(mcu_xml_url))
+
+    with urllib.request.urlopen(gpio_file_url) as response:
+        xml_data = response.read()
+
+    print("Downloaded:", gpio_file_url)
+
+    # Parse all the alternate function mappings from the xml file.
+    it = ET.iterparse(BytesIO(xml_data))
+    for _, el in it:
+        _, _, el.tag = el.tag.rpartition("}")
+    root = it.root
+
+    af_domains = set()
+
+    mapping = defaultdict(list)
+    for pin in root.findall("./GPIO_Pin"):
+        pname = pin_name(pin.get("Name"))
+        if pname is None:
+            continue
+        _ = mapping[pname]  # Ensure pin gets captured / listed
+        for pin_signal in pin.findall("./PinSignal"):
+            for specific_param in pin_signal.findall("SpecificParameter"):
+                if specific_param.get("Name") != "GPIO_AF":
+                    continue
+                signal_name = pin_signal.get("Name")
+                af_fn = specific_param.find("./PossibleValue").text
+                mapping[pname].append((signal_name, af_fn))
+                af_domains.add(af_fn.split("_")[1])
+
+    # Note: "AF0" though "AF15" are somewhat standard across STM range,
+    # however not all chips use all domains. List them all for consistency however.
+    af_domains = ["AF%s" % i for i in range(16)] + ["ADC"]
+
+    # Format the AF data into appropriate CSV file.
+    # First row in CSV is the heading, going through all the AF domains
+    heading = ["Port", "Pin"] + af_domains
+    col_width = [4] * len(heading)
+    # Second csv row lists the peripherals handled by that column
+    category_parts = [defaultdict(set) for _ in range(len(heading))]
+    # Third row onwards are the individual pin function mappings
+    rows = []
+    for pin in sorted(mapping, key=pin_int):
+        functions = mapping[pin]
+        row = [""] * len(heading)
+        row[0] = "Port%s" % pin[1]
+        row[1] = pin
+        for signal, af in functions:
+            # Some signals are loose about whether 1 is declared or not.
+            signal = signal.replace("CAN_", "CAN1_")
+            signal = signal.replace("I2S_", "I2S1_")
+            # / is used later to delineate multiple functions
+            signal = signal.replace("/", "_")
+
+            if signal.startswith("ETH"):
+                signal = eth_remap(signal)
+
+            column = heading.index(re.search("(AF\d+)", af).group(1))
+            peripheral = re.search("([A-Z1-9]*[A-Z]+)(\d*)(_|$)", signal)
+            category_parts[column][peripheral[1]].add(peripheral[2])
+            signal = signal.replace("SYS_", "")
+            signal = signal.replace("-", "/")
+            if row[column]:
+                if signal not in row[column].split("/"):
+                    # multiple af signals per pin
+                    row[column] = "/".join((row[column], signal))
+            else:
+                row[column] = signal
+
+        if pin in adc_pins:
+            row[-1] = "/".join(
+                ("{}{}_{}".format(pt, i, ch) for (pt, ch), i in adc_pins[pin].items())
+            )
+
+        for i, val in enumerate(row):
+            col_width[i] = max(col_width[i], len(val))
+
+        rows.append(row)
+
+    # Simplify the category sets, eg TIM1/TIM2 -> TIM1/2
+    category_head = ["" for _ in range(len(heading))]
+    for i, periph in enumerate(category_parts):
+        periphs = []
+        for key, vals in periph.items():
+            if len(vals) > 1:
+                if "" in vals:
+                    vals.remove("")
+                    vals.add("1")
+                periphs.append(key + "/".join(sorted(vals, key=int)))
+            else:
+                periphs.append(key + vals.pop())
+
+        category_head[i] = "/".join(sorted(periphs))
+        col_width[i] = max(col_width[i], len(category_head[i]))
+    category_head[-1] = "ADC"
+
+    # Sort the rows by the first two columns; port and pin number
+    rows.sort(key=lambda row: (row[0], pin_int(row[1])))
+
+    output_file = Path(__file__).parent / ("%s_af.csv" % target.lower())
+    with output_file.open("w") as out:
+        print("# This was auto-generated by make-af.csv.py", file=out)
+        padded_heading = [val.ljust(col_width[i]) for i, val in enumerate(heading)]
+        print(",".join(padded_heading).strip(), file=out)
+        categories = [val.ljust(col_width[i]) for i, val in enumerate(category_head)]
+        print(",".join(categories).rstrip(), file=out)
+        for row in rows:
+            padded_row = [val.ljust(col_width[i]) for i, val in enumerate(row)]
+            print(",".join(padded_row).strip(), file=out)
+
+    print("Written:", output_file.resolve())
+
+
+def pin_int(pname: str):
+    # Takes a Pin (or AF) name like PA5, PD15 or AF4 and returns the integer component
+    return int(re.search("[PA][A-Z](\d+)", pname).group(1))
+
+
+def pin_name(pin: str):
+    # Filters out just the pin name, eg PB12 from provided pin string
+    return (re.search("P[A-Z]\d+", pin) or [None])[0]
+
+
+def eth_remap(signal):
+    # The AF signal names in stm xml's generally match the names used in datasheets,
+    # except for ethernet RMII / MII ones...
+    # This mapping was generated from comparing xml data to datasheet on STM32H573
+    eth_signals = {
+        "ETH_MDC": "ETH_MDC",
+        "ETH_MDIO": "ETH_MDIO",
+        "ETH_PPS_OUT": "ETH_PPS_OUT",
+        "ETH_CRS": "ETH_MII_CRS",
+        "ETH_COL": "ETH_MII_COL",
+        "ETH_TX_ER": "ETH_MII_TX_ER",
+        "ETH_RXD2": "ETH_MII_RXD2",
+        "ETH_RXD3": "ETH_MII_RXD3",
+        "ETH_TXD3": "ETH_MII_TXD3",
+        "ETH_RX_ER": "ETH_MII_RX_ER",
+        "ETH_TXD2": "ETH_MII_TXD2",
+        "ETH_TX_CLK": "ETH_MII_TX_CLK",
+        "ETH_RX_CLK": "ETH_MII_RX_CLK",
+        "ETH_RX_DV": "ETH_MII_RX_DV",
+        "ETH_REF_CLK": "ETH_RMII_REF_CLK",
+        "ETH_CRS_DV": "ETH_RMII_CRS_DV",
+        "ETH_TX_EN": "ETH_MII_TX_EN/ETH_RMII_TX_EN",
+        "ETH_TXD0": "ETH_MII_TXD0/ETH_RMII_TXD0",
+        "ETH_TXD1": "ETH_MII_TXD1/ETH_RMII_TXD1",
+        "ETH_RXD0": "ETH_MII_RXD0/ETH_RMII_RXD0",
+        "ETH_RXD1": "ETH_MII_RXD1/ETH_RMII_RXD1",
+    }
+    return eth_signals.get(signal, signal)
+
+
+if __name__ == "__main__":
+    for target in sys.argv[1:]:
+        generate_af_csv(target)