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pipistrello: expose LED{1..4} as RTIO channels.
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@ -128,12 +128,7 @@ trce -v 12 -fastpaths -tsi {build_name}.tsi -o {build_name}.twr {build_name}.ncd
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"""
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platform.add_extension(nist_qc1.papilio_adapter_io)
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self.submodules.leds = gpio.GPIOOut(Cat(
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platform.request("user_led", 0),
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platform.request("user_led", 1),
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platform.request("user_led", 2),
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platform.request("user_led", 3),
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))
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self.submodules.leds = gpio.GPIOOut(platform.request("user_led", 4))
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self.comb += [
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platform.request("ttl_l_tx_en").eq(1),
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@ -170,9 +165,10 @@ trce -v 12 -fastpaths -tsi {build_name}.tsi -o {build_name}.twr {build_name}.ncd
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self.submodules += phy
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rtio_channels.append(rtio.Channel.from_phy(phy, ofifo_depth=4))
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phy = ttl_simple.Output(platform.request("user_led", 4))
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self.submodules += phy
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rtio_channels.append(rtio.Channel.from_phy(phy, ofifo_depth=4))
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for led_number in range(4):
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phy = ttl_simple.Output(platform.request("user_led", led_number))
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self.submodules += phy
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rtio_channels.append(rtio.Channel.from_phy(phy, ofifo_depth=4))
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self.add_constant("RTIO_REGULAR_TTL_COUNT", len(rtio_channels))
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@ -54,21 +54,27 @@ The low-cost Pipistrello FPGA board can be used as a lower-cost but slower alter
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When plugged to an adapter, the NIST QC1 hardware can be used. The TTL lines are mapped to RTIO channels as follows:
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+--------------+----------+------------+
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| RTIO channel | TTL line | Capability |
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+==============+==========+============+
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| 0 | PMT0 | Input |
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+--------------+----------+------------+
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| 1 | PMT1 | Input |
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+--------------+----------+------------+
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| 2-16 | TTL0-14 | Output |
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+--------------+----------+------------+
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| 17 | EXT_LED | Output |
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+--------------+----------+------------+
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| 18 | USER_LED | Output |
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+--------------+----------+------------+
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| 19 | TTL15 | Clock |
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+--------------+----------+------------+
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+--------------+------------+------------+
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| RTIO channel | TTL line | Capability |
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+==============+============+============+
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| 0 | PMT0 | Input |
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+--------------+------------+------------+
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| 1 | PMT1 | Input |
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+--------------+------------+------------+
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| 2-16 | TTL0-14 | Output |
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+--------------+------------+------------+
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| 17 | EXT_LED | Output |
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+--------------+------------+------------+
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| 18 | USER_LED_1 | Output |
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+--------------+------------+------------+
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| 19 | USER_LED_2 | Output |
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+--------------+------------+------------+
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| 20 | USER_LED_3 | Output |
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+--------------+------------+------------+
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| 21 | USER_LED_4 | Output |
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+--------------+------------+------------+
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| 22 | TTL15 | Clock |
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+--------------+------------+------------+
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The input only limitation on channels 0 and 1 comes from the QC-DAQ adapter. When the adapter is not used (and physically unplugged from the Pipistrello board), the corresponding pins on the Pipistrello can be used as outputs. Do not configure these channels as outputs when the adapter is plugged, as this would cause electrical contention.
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