Implement an API to specifiy the interrupt trigger for GPIO pins, and
control interrupts. This completes the GPIO API.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Everything needed to set up and control the GPIO pins is implemented,
EXCEPT setting up interrupts. This is the subject of a subsequent patch.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Put the Doxygen blocks in well-formatted C comments. This looks better
and is less distracting than putting them in unformatted comments.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Modify lm4f_ep_read/write_packet() to take advantage of 32-bit and 16-bit
accesses to the USB FIFO, as opposed to using only 8-bit accesses. This
change increases endpoint performance in a number of configurations.
On the host side, we use usb_bulk_bench to test
https://github.com/mrnuke/usb_bulk_bench
With the following invocations:
usb_bulk_bench -d c03e:b007 -a -t 64 -q 32 -e [ep] [-I/-O]
On the device side, we use the usb_bulk_dev example:
https://github.com/mrnuke/libopencm3-examples/tree/stellaris
The example is in: examples/lm4f/stellaris-ek-lm4f120xl/usb_bulk_dev
(This example will be available in libopencm3-examples in the near future)
The endpoints configuration is the following:
* EP1 OUT - interrupt driven RX endpoint
* EP2 IN - interrupt driven TX endpoint
* EP3 OUT - polled RX endpoint
* EP4 IN - polled TX endpoint
* EP5 OUT - polled RX endpoint with unaligned buffer
* EP6 IN - polled TX endpoint with unaligned buffer
We test the speed in each configuration, using different system clock
frequencies. We run the tests once without the patch applied, and once with
the patch applied. The results are given below:
Before patch (numbers in KiB/s):
freq: 80 MHz 57 MHz 40 MHz 30 MHz 20 MHz 16 MHz
EP1 562 562 562 562 562 550
EP2 936 872 812 812 687 625
EP3 1062 890 700 600 562 562
EP4 900 812 812 750 625 562
EP5 1062 890 700 600 562 562
EP6 930 812 812 750 625 562
With patch (numbers in KiB/s):
freq: 80 MHz 57 MHz 40 MHz 30 MHz 20 MHz 16 MHz
EP1 1062 1062 1062 690 562 562
EP2 1125 936 936 936 870 812
EP3 1062 960 750 750 562 562
EP4 936 936 870 870 770 700
EP5 1062 900 700 630 562 562
EP6 930 930 870 870 740 650
Percent change in speed (*):
freq: 80 MHz 57 MHz 40 MHz 30 MHz 20 MHz 16 MHz
EP1 89.0 89.0 89.0 22.8 0.0 2.2
EP2 20.2 7.3 15.3 15.3 26.6 29.9
EP3 0.0 7.9 7.1 25.0 0.0 0.0
EP4 4.0 15.3 7.1 16.0 23.2 24.6
EP5 0.0 1.1 0.0 5.0 0.0 0.0
EP6 0.0 14.5 7.1 16.0 18.4 15.7
(*) Numbers given as percent change relative to speed before applying this
patch.
We see throughput increases across the board.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Add functions to enable and disable USB interrupts, and document how to
use these functions to run usbd_poll() from the usb ISR.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Implement a basic driver for the LM4F USB controller. The driver is in a
basic form. DMA is not yet implemented. Double-buffering is supported by
the hardware, but is not yet implemented
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Add a complete API for controlling the UART interrupts.
Doxygen documentation with inline code examples is also provided in this patch.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Add basic functionality needed to setup the UART and send/recieve data.
Interrupts, DMA, and more advanced features are not implemented in this patch.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
rcc_set_pll_divisor() would take the number we wanted to divide the 400MHz
clock and put it directly in the RCC2 register. This caused the clock to always
be one speed tier slower than expected. The value of the divisor must be
decremented by 1, so a divisor of 5 will be written as 4 in the RCC2.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
to remove errors, duplications and inconsistencies.
File lib/stm32/f1/pwr.c - all code removed as it duplicates that in common/pwr_common.c
Remaining changes do not affect code. Compiles OK.
TODO efm32 has no code so generates no modules
TODO F2 needs pwr.c
TODO L1 needs dma.h and dma.c
Add an abstraction layer to handle the clock control for the run time clock on
LM4F (RCC). Sleep and deep-sleep clock configuration is not handled.
Complete documentation for the clock control API is included in doxygen-style
comments, and is included in [doc].
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Conflicts:
lib/lm4f/Makefile
The enum definitions are specified in the form
31:5 register offset from SYSCTL_BASE for the clock register
4:0 bit offset for the given peripheral
The names have the form [clock_type]_[periph_type]_[periph_number]
Where clock_type is
RCC for run clock
SCC for sleep clock
DCC for deep-sleep clock
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Specify the -mfloat-abi=hard and -mfpu=fpv4-sp-d16 flags so that FPU
is enabled by default.
While this compiles with FPU support, in order to use the floating point types,
the FPU must be explicitly enabled at runtime.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Create lm4f code infrastructure from the lm3s infrastructure.
As far as the interrupt table is concerned, don't create an irq.yaml. Just
include the LM3S nvic.h. The LM3S vector table seems to be compatible with the
LM4F
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Paul Fleischer