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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,180 @@ | ||
| # TLA2518 8-channel 12-bit ADC support | ||
| # | ||
| # Copyright (C) 2023 Lasse Dalegaard <[email protected]> | ||
| # | ||
| # This file may be distributed under the terms of the GNU GPLv3 license. | ||
| from . import bus | ||
|
|
||
| TLA2518_CHANNEL_COUNT = 8 | ||
| REPORT_TIME = 0.1 | ||
| SAMPLE_TIME = 128 / 1e6 | ||
|
|
||
|
|
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| class TLA2518: | ||
| def __init__(self, config): | ||
| self.printer = config.get_printer() | ||
| self.ppins = config.get_printer().load_object(config, "pins") | ||
| self.config_error = config.error | ||
| self.reactor = self.printer.get_reactor() | ||
| self.name = " ".join(config.get_name().split()[1:]) | ||
| self.spi = bus.MCU_SPI_from_config(config, 0, default_speed=5000000) | ||
| self.mcu = self.spi.get_mcu() | ||
| self.mcu.register_config_callback(self._build_config) | ||
| self.oid = self.mcu.create_oid() | ||
| self.mcu.register_response( | ||
| self._handle_response, "tla2518_result", self.oid | ||
| ) | ||
| self.printer.register_event_handler( | ||
| "klippy:connect", self._handle_connect | ||
| ) | ||
|
|
||
| self.channels = [None for _ in range(TLA2518_CHANNEL_COUNT)] | ||
|
|
||
| def _build_config(self): | ||
| channels = 0 | ||
| for channel in self.channels: | ||
| if channel is not None: | ||
| channels |= channel.bit | ||
|
|
||
| self.adc_channel_mask = channels | ||
| if channels != 0: | ||
| self.mcu.add_config_cmd( | ||
| "config_tla2518 oid=%u spi_oid=%u channels=%u" | ||
| % (self.oid, self.spi.get_oid(), channels) | ||
| ) | ||
|
|
||
| def _chip_reset(self): | ||
| self._reg_write(0x01, 0x1) # Write RST to GENERAL_CFG | ||
|
|
||
| # Wait for reset | ||
| timeout = self.reactor.monotonic() + 5.0 | ||
| while True: | ||
| if self._reg_read(0x01) & 0x01 == 0: | ||
| break | ||
| now = self.reactor.monotonic() | ||
| if now > timeout: | ||
| msg = f"Timeout trying to reset TLA2518 {self.name}" | ||
| self.printer.invoke_shutdown(msg) | ||
| raise | ||
| self.reactor.pause(now + 0.1) | ||
| if self._reg_read(0x00) != 0x81: | ||
| msg = f"TLA2518 '{self.name}' could not be reset" | ||
| self.printer.invoke_shutdown(msg) | ||
| raise | ||
|
|
||
| def _handle_connect(self): | ||
| if self.adc_channel_mask == 0: | ||
| return | ||
|
|
||
| self._chip_reset() | ||
| # DATA_CFG: APPEND_STATUS = 01b, include channel ID | ||
| self._reg_write(0x2, 1 << 4) | ||
| # OSR_CFG: OSR_CFG = 0111b, 128 sample oversampling | ||
| self._reg_write(0x3, 0x7) | ||
| # SEQUENCE_CFG: SEQ_MODE=10b, on the fly mode | ||
| self._reg_write(0x10, 0b10) | ||
| clock = self.mcu.get_query_slot(self.oid) | ||
| cmd = self.mcu.lookup_command( | ||
| "query_tla2518 oid=%c clock=%u rest_ticks=%u sample_ticks=%u" | ||
| ) | ||
| cmd.send( | ||
| [ | ||
| self.oid, | ||
| clock, | ||
| self.mcu.seconds_to_clock(REPORT_TIME), | ||
| self.mcu.seconds_to_clock(SAMPLE_TIME), | ||
| ] | ||
| ) | ||
|
|
||
| def _handle_response(self, params): | ||
| idx = params["channel"] | ||
| if idx >= len(self.channels): | ||
| return | ||
| channel = self.channels[idx] | ||
| if channel is not None: | ||
| channel._handle_response(params) | ||
|
|
||
| def _reg_write(self, addr, value): | ||
| self.spi.spi_send([0x08, addr, value]) | ||
|
|
||
| def _reg_read(self, addr): | ||
| params = self.spi.spi_transfer_with_preface( | ||
| [0x10, addr, 0x00], | ||
| [0x00, 0x00, 0x00], | ||
| ) | ||
| return params["response"][0] | ||
|
|
||
| def _register_channel(self, channel, output): | ||
| orig = channel | ||
| if channel.startswith("adc"): | ||
| channel = channel[3:] | ||
| try: | ||
| channel = int(channel) | ||
| except ValueError: | ||
| raise self.config_error(f"invalid TLA2518 channel '{orig}'") | ||
| if channel < 0 or channel >= TLA2518_CHANNEL_COUNT: | ||
| raise self.config_error( | ||
| f"invalid TLA2518 channel '{orig}', valid range 0 to " | ||
| f"{TLA2518_CHANNEL_COUNT-1}" | ||
| ) | ||
| cur = self.channels[channel] | ||
| if cur is None: | ||
| cur = self.channels[channel] = TLA2518Channel(self, channel) | ||
| cur._register_handler(output) | ||
| return cur | ||
|
|
||
| # Pins interface | ||
|
|
||
| def setup_pin(self, type, params): | ||
| if type != "adc": | ||
| raise self.ppins.error( | ||
| "pin type %s not supported on TLA2518" % (type,) | ||
| ) | ||
| return TLA2518ADC(self, params) | ||
|
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||
|
|
||
| class TLA2518Channel: | ||
| def __init__(self, chip, idx): | ||
| self.idx = idx | ||
| self.bit = 1 << idx | ||
| self.handlers = [] | ||
|
|
||
| def _register_handler(self, output): | ||
| self.handlers.append(output) | ||
|
|
||
| def _handle_response(self, params): | ||
| for handler in self.handlers: | ||
| handler._handle_response(params) | ||
|
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||
|
|
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| class TLA2518ADC: | ||
| def __init__(self, chip, params): | ||
| self.channel = chip._register_channel(params["pin"], self) | ||
| self.chip = chip | ||
| self._callback = None | ||
|
|
||
| def _handle_response(self, params): | ||
| if self._callback: | ||
| read_time = self.chip.mcu.clock_to_print_time(params["clock"]) | ||
| self._callback(read_time, params["value"] / 65535) | ||
|
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| # MCU_adc interface | ||
|
|
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| def setup_adc_callback(self, _report_time, callback): | ||
| self._callback = callback | ||
|
|
||
| def setup_minmax( | ||
| self, | ||
| sample_time, | ||
| sample_count, | ||
| minval=0.0, | ||
| maxval=1.0, | ||
| range_check_count=0, | ||
| ): | ||
| pass | ||
|
|
||
|
|
||
| def load_config_prefix(config): | ||
| obj = TLA2518(config) | ||
| chip_name = "tla2518_" + obj.name | ||
| obj.ppins.register_chip(chip_name, obj) |
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