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mcbridejc
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[sam] Add driver for SAMG timer channels
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‎README.md‎

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@@ -449,7 +449,7 @@ Please [discover modm's peripheral drivers for your specific device][discover].
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<td align="center">✅</td>
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<td align="center">✅</td>
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<td align="center">○</td>
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<td align="center">○</td>
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<td align="center">✅</td>
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<td align="center">○</td>
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<td align="center">○</td>
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<td align="center">○</td>

‎examples/samg55_xplained_pro/timer/main.cpp‎

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/*
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* Copyright (c) 2021, Jeff McBride
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*
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* This file is part of the modm project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#include <modm/board.hpp>
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#include <modm/io/iostream.hpp>
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#include <modm/platform.hpp>
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using namespace modm::platform;
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using namespace modm::literals;
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MODM_ISR(TC3)
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{
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// Clear pending interrupts by reading them
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(void)TimerChannel3::getInterruptFlags();
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static bool flag = false;
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if (flag)
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{
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TimerChannel0::setTiobEffects(TimerChannel0::TioEffect::Clear,
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TimerChannel0::TioEffect::Set);
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} else
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{
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TimerChannel0::setTiobEffects(TimerChannel0::TioEffect::Set,
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TimerChannel0::TioEffect::Clear);
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}
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flag = !flag;
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}
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int
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main()
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{
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/*
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* This example uses channel 0 to generate two output waveforms, and channel3
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* to create a periodic IRQ which swaps the polarity on the TIOB output.
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*
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* Note:
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* On the SAMG55, the waveform outputs on the second module (TC1, TimerChannel[3-5])
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* are not connected to external pins.
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*/
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Board::initialize();
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TimerChannel0::initialize();
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TimerChannel0::connect<GpioA0::Tioa, GpioA1::Tiob>();
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TimerChannel0::setClockSource(TimerChannel0::ClockSource::MckDiv2);
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TimerChannel0::setWaveformMode(true);
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// Setup timer to count up, and trigger reset on Rc match
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TimerChannel0::setWaveformSelection(TimerChannel0::WavSel::Up_Rc);
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// Setup TioA to set on RA match, and clear on RC match
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TimerChannel0::setTioaEffects(TimerChannel0::TioEffect::Set, TimerChannel0::TioEffect::Clear);
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// Setup TioB to clear on RB match, and set on RC match
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TimerChannel0::setTiobEffects(TimerChannel0::TioEffect::Clear, TimerChannel0::TioEffect::Set);
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// Change external event source, so that TIOB can be used as an output
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TimerChannel0::setExtEventSource(TimerChannel0::ExtEventSource::Xc0);
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TimerChannel0::setRegA(10000);
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TimerChannel0::setRegB(5000);
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TimerChannel0::setRegC(15000);
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TimerChannel0::enable();
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TimerChannel0::start();
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// Setup TC3 irq to swap TIOB polarity periodically
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// Period = 128 * 10000 / 120MHz = ~10.6ms
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TimerChannel3::initialize();
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TimerChannel3::setClockSource(TimerChannel0::ClockSource::MckDiv128);
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TimerChannel3::setRegC(10000);
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TimerChannel3::setWaveformMode(true);
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TimerChannel3::setWaveformSelection(TimerChannel0::WavSel::Up_Rc);
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TimerChannel3::enableInterruptVector(true);
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TimerChannel3::enableInterrupt(TimerChannel3::Interrupt::RcCompare);
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TimerChannel3::enable();
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TimerChannel3::start();
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while (true)
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;
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}

‎examples/samg55_xplained_pro/timer/openocd.cfg‎

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# Configure for ATSAMG55-XPRO dev board
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source [find interface/cmsis-dap.cfg]
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set CHIPNAME ATSAMG55J19
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source [find target/at91samg5x.cfg]

‎examples/samg55_xplained_pro/timer/project.xml‎

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<library>
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<extends>modm:samg55-xplained-pro</extends>
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<options>
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<option name="modm:build:build.path">../../../build/samg55_xplained_pro/timer</option>
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<option name="modm:build:openocd.cfg">openocd.cfg</option>
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</options>
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<modules>
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<module>modm:build:scons</module>
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<module>modm:platform:timer:0</module>
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<module>modm:platform:timer:1</module>
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<module>modm:platform:timer:2</module>
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<module>modm:platform:timer:3</module>
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</modules>
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</library>

‎src/modm/board/samg55_xplained_pro/board.hpp‎

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@@ -27,7 +27,16 @@ struct SystemClock
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static constexpr uint32_t Frequency = PllAMult * SlowClkFreqHz; // CPU core frequency
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static constexpr uint32_t Usb = PllBMult * SlowClkFreqHz;
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static constexpr uint32_t Mck = Frequency; // Master clock, used by most peripherals
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static constexpr uint32_t Mck = Frequency; // Master clock: default used by most peripherals
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// Programmable clocks: optionally used by certain peripherals
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static constexpr uint32_t Pck0 = Mck;
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static constexpr uint32_t Pck1 = Mck;
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static constexpr uint32_t Pck2 = Mck;
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static constexpr uint32_t Pck3 = Mck;
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static constexpr uint32_t Pck4 = Mck;
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static constexpr uint32_t Pck5 = Mck;
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static constexpr uint32_t Pck6 = Mck;
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static constexpr uint32_t Pck7 = Mck;
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static bool inline
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enable()

‎src/modm/platform/timer/samg/module.lb‎

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#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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#
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# Copyright (c) 2021, Jeff McBride
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#
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# This file is part of the modm project.
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#
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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# -----------------------------------------------------------------------------
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props = {}
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class Instance(Module):
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def __init__(self, driver, instance, channel):
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self.driver = driver
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self.instance = int(instance)
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self.channel = channel
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self.vectors = None
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def init(self, module):
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module.name = str(self.instance)
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module.description = "Instance {}".format(self.instance)
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def prepare(self, module, options):
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return True
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def build(self, env):
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global props
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props["id"] = self.instance
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props["module"] = int(self.instance / 3)
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props["channel"] = self.channel
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env.substitutions = props
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env.outbasepath = "modm/src/modm/platform/timer"
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env.template("timer_channel.hpp.in", "timer_channel_{}.hpp".format(self.instance))
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def init(module):
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module.name = ":platform:timer"
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module.description = "Timers (TC)"
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def prepare(module, options):
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device = options[":target"]
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if not device.has_driver("tc:samg*"):
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return False
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module.depends(
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":cmsis:device",
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":platform:gpio")
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timers = device.get_all_drivers("tc:samg*")
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for driver in timers:
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for instance in driver["instance"]:
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instance = int(instance)
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# Each TC instance has 3 channels, and we create an independent driver for each
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for channel in range(3):
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module.add_submodule(Instance(driver, instance*3+channel, channel))
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global props
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device = options[":target"]
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props["target"] = device.identifier
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return True
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def build(env):
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env.outbasepath = "modm/src/modm/platform/timer"
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env.copy("timer_channel_base.hpp")

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