Albert Ou
14ffd35f5c
uart: Eliminate systemic baud rate error with low divisor values
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This refactors the receiver logic to compensate for the case of the baud
rate divisor not being multiple of the oversampling period.
Previously, the bit time was effectively rounded to (s * floor(div / s))
cycles, where "s" is the oversampling factor - the number of
intermediate samples for each data bit. The remainder r = (div % s) was
ignored, thereby resulting in gradually accumulated drift that became
significant for divisor values on the same order of magnitude as "s".
The revised approach inserts the required additional delay by extending
the last "r" samples of a given data bit by one cycle each.
2018-01-04 19:51:24 -08:00
Megan Wachs
9052a079d4
Merge pull request #46 from sifive/gpio_iof_pueds
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GPIO: IOF should not override PUE and DS
2017-11-08 17:18:02 -08:00
Megan Wachs
90404980b8
GPIO: IOF should not override PUE and DS
2017-11-08 15:15:32 -08:00
Wesley W. Terpstra
d1d2f47f60
PMU: adapt to new chisel API ( #45 )
2017-11-02 15:44:02 -07:00
Wesley W. Terpstra
90e6ea1d2d
devices: switch to using node-style API ( #44 )
2017-10-28 12:29:31 -07:00
Wesley W. Terpstra
e4960a4e5a
sifive-blocks: update to new rocket API ( #43 )
2017-10-26 16:10:18 -07:00
Megan Wachs
e6da80733e
Merge pull request #42 from sifive/enhanced_to_base_pin
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pinctrl: Add the ability to convert EnhancedPin to BasePin
2017-10-11 06:43:41 -07:00
Megan Wachs
94f8c1705d
pinctrl: Add the ability to convert EnhancedPin to BasePin
2017-10-06 13:43:23 -07:00
Megan Wachs
e2695500cd
Merge pull request #41 from sifive/pwm_invert
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PWM: Add the ability to invert the output directly in PWM
2017-10-05 16:32:26 -07:00
Megan Wachs
3e47ed6b33
PWM: Add the ability to invert the output directly in PWM (without GPIO pinmux)
2017-10-02 15:08:06 -07:00
Wesley W. Terpstra
4fcf349adb
diplomacy: update to new API ( #40 )
2017-09-27 16:33:18 -07:00
Megan Wachs
fe65a87c5c
Merge pull request #39 from sifive/signal_bundles
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Create Signal Bundles vs just Pins
2017-09-25 11:21:08 -07:00
Megan Wachs
77df75f4ed
GPIO Pins needs clone type.
2017-09-22 16:38:37 -07:00
Megan Wachs
5d1e9b793a
signal_bundles: add missing file
2017-09-22 13:55:55 -07:00
Megan Wachs
81e301f9f7
pinctrl: Create extendable Signal classes
2017-09-22 13:17:31 -07:00
Megan Wachs
38f537c438
device pins: Create classes that can be something other than a Pin subclass
2017-09-20 16:43:42 -07:00
Megan Wachs
6a13639cf3
SPI: Make it easier to build arbitrary bundles
2017-09-20 16:21:21 -07:00
Henry Cook
f8dcfbacfa
uart: use PeripheryBusKey ( #38 )
2017-09-15 14:54:10 -07:00
Megan Wachs
d5554bfe95
Merge pull request #37 from sifive/synchronizers
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remove duplicate ResetCatchAndSync definition
2017-09-07 13:34:14 -07:00
Megan Wachs
97c3fcb4b6
shiftregs: Use SyncResetSynchronizerShiftReg primitives where appropriate
2017-09-06 10:59:07 -07:00
Megan Wachs
4381e395af
i2c/uart: Name the synchronizers
2017-09-05 18:40:22 -07:00
Megan Wachs
48222bcd2d
gpio: Use Synchronizer for the inputs
2017-09-05 18:35:09 -07:00
Megan Wachs
1feaefe4c5
i2c, uart: Use Synchronizer primitives for the inputs
2017-09-05 18:32:37 -07:00
Megan Wachs
c68d556768
ShiftRegInit: use the rocket-chip version since it is there now
2017-09-05 17:51:40 -07:00
Megan Wachs
7d07e3af0b
regs: remove duplicate ShiftReg file which is now in rocket-chip
2017-09-05 17:33:32 -07:00
Megan Wachs
acb8889382
remove duplicate ResetCatchAndSync definition
2017-08-24 18:12:36 -07:00
Megan Wachs
402017d34e
Merge pull request #35 from sifive/spi-buffers
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spi: put a request buffer infront of SPI
2017-08-20 16:47:01 -07:00
Megan Wachs
70c25846b8
spi: Make memory mapped interface depth a parameter
2017-08-20 12:39:38 -07:00
Wesley W. Terpstra
a814cba04f
spi: put a request buffer infront of SPI
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This will prevent SPI from blocking other pbus requests.
2017-08-19 12:52:10 -07:00
Shreesha Srinath
f266b55da9
Merge pull request #34 from ss2783/master
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Updates to go with the fpga-shells directory
2017-08-18 14:27:57 -07:00
Shreesha Srinath
249c23e617
Renamed ShiftReg to ShiftRegister
2017-08-17 18:22:51 -07:00
Shreesha Srinath
7035ccc431
Updates to go with the fpga-shells directory
2017-08-17 18:12:49 -07:00
Wesley W. Terpstra
d973c659eb
uart: make it easy to simulate large text printouts ( #33 )
2017-08-10 16:32:48 -07:00
Shreesha Srinath
5b74df20a1
Merge pull request #31 from ss2783/fix-mockaon
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mockaon: Adds logic to detect external rtc toggles
2017-08-04 11:46:06 -07:00
Shreesha Srinath
26dd0af657
mockaon: Adds logic to detect external rtc toggles
2017-08-02 18:11:05 -07:00
Albert Ou
7f368987a8
Merge pull request #30 from sifive/spi
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spi: Fix invalid D channel response when flash interface is disabled
2017-08-02 13:33:11 -09:00
Albert Ou
c59356d1de
spi: Fix invalid D channel response when flash interface is disabled
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Issue: When the memory-mapped flash region is accessed while the flash
read mode is disabled (fctrl.en flag is clear), the SPI flash controller
generates an invalid response on the D channel.
This may cause the TileLink bus to deadlock.
Workaround: Software should avoid accessing the memory-mapped flash
region when the SPI controller is not in the flash read mode.
2017-08-02 13:50:00 -07:00
Henry Cook
015f87ec6b
allow bundle content params to be specified via a def ( #29 )
2017-08-02 11:46:27 -07:00
Wesley W. Terpstra
fced2323bd
spi: remove removed sink arg
2017-07-26 16:02:44 -07:00
Yunsup Lee
86010395ad
Merge pull request #27 from sifive/typed_pad_ctrl
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Seperate GPIO Peripheral Functionality
2017-07-25 16:37:46 -07:00
Yunsup Lee
4cb2f8af17
mockaon: rename pads to pins
2017-07-25 15:02:22 -07:00
Megan Wachs
aa6d911c26
Ports: Rename the 'fromXYZPort' to 'fromPort' since it's redundant
2017-07-25 08:36:28 -07:00
Megan Wachs
2139ab0d98
Merge remote-tracking branch 'origin/master' into typed_pad_ctrl
2017-07-25 07:05:22 -07:00
Yunsup Lee
5e51e1e931
uart: use PeripheryBusParams.frequency to calculate default divisor ( #28 )
2017-07-25 00:56:22 -07:00
Megan Wachs
0a80d1987d
Merge remote-tracking branch 'origin/master' into typed_pad_ctrl
2017-07-24 10:11:52 -07:00
Henry Cook
9ae6413273
periphery: peripherals now in coreplex ( #26 )
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* periphery: peripherals now in coreplex
* use fromAsyncFIFOMaster
2017-07-23 08:31:44 -07:00
Megan Wachs
2bad829e6e
gpio: Add missing file
2017-07-20 14:53:34 -07:00
Megan Wachs
06f0d20742
Add missing cloneType methods to pin bundles
2017-07-20 11:36:31 -07:00
Megan Wachs
00086c26e6
i2c: Remove pluralization on the bundle name, i2c not i2cs
2017-07-20 10:53:44 -07:00
Megan Wachs
ef4f2ed888
Remove pluralization on interface names. Require clocks and resets explicitly when necessary
2017-07-19 14:51:50 -07:00
