| The HAL Port | ||
|---|---|---|
 | Chapter 308. BCM943362WCD4 Platform HAL |  |
Name
HAL Port — Implementation Details
Overview
This documentation explains how the eCos HAL specification has been mapped onto the Broadcom BCM943362WCD4 module hardware and should be read in conjunction with the specification for that device. The BCM943362WCD4 platform HAL package complements the Cortex-M architectural HAL and the STM32 variant HAL. It provides functionality which is specific to the target module, and optionally, specifically supported motherboards.
Targetting the eCos platform bcm943362wcd4 will
configure eCos for a stand-alone BCM943362WCD4 module with no
assumption made about the I/O connected to the module TP pins.
Targetting the bcm943362wcd4_evb platform will
configure eCos for a BCM9WCD1EVAL1 motherboard based module, and
provide access to the LEDs, switches, thermistor and SPI flash device
available on that motherboard.
Startup
Following a hard or soft reset the HAL will initialize or reinitialize
many of the on-chip peripherals. There is an exception
for RAM startup applications which depend on a ROM
monitor for certain services.
For the stand-alone application startup types, the HAL will perform
additional initialization, programming the various internal registers
including the PLL, peripheral clocks and GPIO pins. The details of
the early hardware startup may be found in
the src/bcm943362wcd4_misc.c in both
the hal_system_init
and hal_platform_init functions.
Memory Map
The platform HAL package provides the memory layout information needed to generate the linker script. The key memory locations are as follows:
- Internal RAM
-
This is located at address
0x20000000of the memory space, and is 128KiB in size. The eCos VSR table always occupies the initial bytes at the base of this memory, followed by the optional virtual vector table depending on the eCos configuration. The topCYGNUM_HAL_COMMON_INTERRUPTS_STACK_SIZEbytes of memory are reserved for the interrupt stack. The remainder of on-chip SRAM is available for use by applications. - Internal FLASH
-
This is located at address
0x08000000of the memory space and will be mapped to0x00000000at reset. This region is 1MiB in size. andROMapplications are by default configured to run from this memory. - On-Chip Peripherals
-
These are accessible at locations
0x40000000and0xE0000000upwards. Descriptions of the contents can be found in the relevant STM32 User Manual.
Linker Scripts
The platform linker scripts define the following symbols:
- hal_vsr_table
-
This defines the location of the VSR table. This is set to
0x20000000for all startup types, and space forCYGNUM_HAL_VSR_COUNTentries is reserved to match the use of a STM32F2 processor. - hal_virtual_vector_table
This defines the location of the virtual vector table used to communicate between an ROM monitor and an eCos application. This is allocated right after the VSR table, and is normally
0x20000184for STM32F2 targets.The CDL option
CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORTdefines whether this virtual vector support is needed. If not defined then the table is zero sized.- hal_virtual_vector_table_end
- This defines the location of the end of the (optional) virtual vector table.
- hal_interrupt_stack
-
This defines the location of the interrupt stack. For all startup
types this is allocated to the top of internal SRAM,
at
0x20020000. - hal_startup_stack
-
This defines the location of the startup stack. For all startup types
it is initially allocated at the half-way point of the interrupt
stack. The size of the interrupt stack is defined by the CDL
option
CYGNUM_HAL_COMMON_INTERRUPTS_STACK_SIZE.
Flash wait states
The BCM943362WCD4 platform HAL provides a configuration option to
set the number of Flash read wait states to use:
CYGNUM_HAL_CORTEXM_STM32_FLASH_WAIT_STATES. It is
important to verify and if necessary update this value if changing the
CPU clock (HCLK) frequency or CPU voltage. Consult the STM32 Flash
programming manual (PM0059) for appropriate values for different clock
speeds or voltages. The default of 3 reflects a
supply voltage of 3.3V and HCLK of 120MHz.
Diagnostic LEDs
The platform HAL header file
at <cyg/hal/plf_io.h>
defines the following convenience function to allow any LEDs to be
set:
extern void hal_bcm943362wcd4_led(unsigned char c);
The low-order bits of the argument c correspond to individual LEDs.
The default BCM943362WCD4 module support does not provide LEDs, since
the relevant off-module GPIO signals are not defined. However, when
targetting the BCM9WCD1EVAL1 motherboard two LEDs are fitted for
diagnostic purposes: D1 (red) and D2 (green). These LEDs are free for
application
use. The bcm943362wcd4_evbmanual
test provides a simple example of changing the LED state.
Real-time characterization
The tm_basic kernel test gives statistics gathered
about the real-time characterization and performance of the
kernel. The sample output is shown here for information. The test was
built for the bcm943362wcd4_evb platform using
the SRAM startup type and optimization flag -O2.
Example 308.1. bcm943362wcd4 Real-time characterization
Startup, main thrd : stack used 360 size 1536
Startup : Idlethread stack used 76 size 1280
eCos Kernel Timings
Notes: all times are in microseconds (.000001) unless otherwise stated
Reading the hardware clock takes 0 'ticks' overhead
... this value will be factored out of all other measurements
Clock interrupt took 7.06 microseconds (7 raw clock ticks)
Testing parameters:
Clock samples: 32
Threads: 8
Thread switches: 128
Mutexes: 16
Mailboxes: 16
Semaphores: 16
Scheduler operations: 128
Counters: 16
Flags: 16
Alarms: 16
Stack Size: 1088
Confidence
Ave Min Max Var Ave Min Function
====== ====== ====== ====== ========== ========
INFO:<Ctrl-C disabled until test completion>
5.63 5.00 6.00 0.47 62% 37% Create thread
1.00 1.00 1.00 0.00 100% 100% Yield thread [all suspended]
1.38 1.00 2.00 0.47 62% 62% Suspend [suspended] thread
1.38 1.00 2.00 0.47 62% 62% Resume thread
1.88 1.00 2.00 0.22 87% 12% Set priority
0.25 0.00 1.00 0.38 75% 75% Get priority
3.63 3.00 4.00 0.47 62% 37% Kill [suspended] thread
1.25 1.00 2.00 0.38 75% 75% Yield [no other] thread
2.00 2.00 2.00 0.00 100% 100% Resume [suspended low prio] thread
1.25 1.00 2.00 0.38 75% 75% Resume [runnable low prio] thread
2.00 2.00 2.00 0.00 100% 100% Suspend [runnable] thread
1.00 1.00 1.00 0.00 100% 100% Yield [only low prio] thread
1.38 1.00 2.00 0.47 62% 62% Suspend [runnable->not runnable]
4.00 4.00 4.00 0.00 100% 100% Kill [runnable] thread
3.00 3.00 3.00 0.00 100% 100% Destroy [dead] thread
5.75 5.00 6.00 0.38 75% 25% Destroy [runnable] thread
6.50 6.00 7.00 0.50 100% 50% Resume [high priority] thread
2.28 2.00 3.00 0.40 71% 71% Thread switch
0.21 0.00 1.00 0.33 78% 78% Scheduler lock
1.11 1.00 2.00 0.19 89% 89% Scheduler unlock [0 threads]
1.13 1.00 2.00 0.22 87% 87% Scheduler unlock [1 suspended]
1.14 1.00 2.00 0.24 85% 85% Scheduler unlock [many suspended]
1.13 1.00 2.00 0.22 87% 87% Scheduler unlock [many low prio]
0.38 0.00 1.00 0.47 62% 62% Init mutex
1.44 1.00 2.00 0.49 56% 56% Lock [unlocked] mutex
2.00 2.00 2.00 0.00 100% 100% Unlock [locked] mutex
1.44 1.00 2.00 0.49 56% 56% Trylock [unlocked] mutex
1.31 1.00 2.00 0.43 68% 68% Trylock [locked] mutex
0.44 0.00 1.00 0.49 56% 56% Destroy mutex
7.00 7.00 7.00 0.00 100% 100% Unlock/Lock mutex
0.69 0.00 1.00 0.43 68% 31% Create mbox
0.50 0.00 1.00 0.50 100% 50% Peek [empty] mbox
1.63 1.00 2.00 0.47 62% 37% Put [first] mbox
0.25 0.00 1.00 0.38 75% 75% Peek [1 msg] mbox
1.63 1.00 2.00 0.47 62% 37% Put [second] mbox
0.00 0.00 0.00 0.00 100% 100% Peek [2 msgs] mbox
1.56 1.00 2.00 0.49 56% 43% Get [first] mbox
1.50 1.00 2.00 0.50 100% 50% Get [second] mbox
1.31 1.00 2.00 0.43 68% 68% Tryput [first] mbox
1.31 1.00 2.00 0.43 68% 68% Peek item [non-empty] mbox
1.44 1.00 2.00 0.49 56% 56% Tryget [non-empty] mbox
1.25 1.00 2.00 0.38 75% 75% Peek item [empty] mbox
1.31 1.00 2.00 0.43 68% 68% Tryget [empty] mbox
0.25 0.00 1.00 0.38 75% 75% Waiting to get mbox
0.31 0.00 1.00 0.43 68% 68% Waiting to put mbox
0.56 0.00 1.00 0.49 56% 43% Delete mbox
4.94 4.00 5.00 0.12 93% 6% Put/Get mbox
0.31 0.00 1.00 0.43 68% 68% Init semaphore
1.00 1.00 1.00 0.00 100% 100% Post [0] semaphore
1.44 1.00 2.00 0.49 56% 56% Wait [1] semaphore
1.19 1.00 2.00 0.30 81% 81% Trywait [0] semaphore
1.13 1.00 2.00 0.22 87% 87% Trywait [1] semaphore
0.44 0.00 1.00 0.49 56% 56% Peek semaphore
0.38 0.00 1.00 0.47 62% 62% Destroy semaphore
4.69 4.00 5.00 0.43 68% 31% Post/Wait semaphore
0.56 0.00 1.00 0.49 56% 43% Create counter
0.44 0.00 1.00 0.49 56% 56% Get counter value
0.38 0.00 1.00 0.47 62% 62% Set counter value
1.63 1.00 2.00 0.47 62% 37% Tick counter
0.31 0.00 1.00 0.43 68% 68% Delete counter
0.38 0.00 1.00 0.47 62% 62% Init flag
1.38 1.00 2.00 0.47 62% 62% Destroy flag
1.13 1.00 2.00 0.22 87% 87% Mask bits in flag
1.44 1.00 2.00 0.49 56% 56% Set bits in flag [no waiters]
2.00 2.00 2.00 0.00 100% 100% Wait for flag [AND]
1.81 1.00 2.00 0.31 81% 18% Wait for flag [OR]
2.00 2.00 2.00 0.00 100% 100% Wait for flag [AND/CLR]
1.94 1.00 2.00 0.12 93% 6% Wait for flag [OR/CLR]
0.25 0.00 1.00 0.38 75% 75% Peek on flag
1.00 1.00 1.00 0.00 100% 100% Create alarm
2.00 2.00 2.00 0.00 100% 100% Initialize alarm
1.19 1.00 2.00 0.30 81% 81% Disable alarm
2.00 2.00 2.00 0.00 100% 100% Enable alarm
1.31 1.00 2.00 0.43 68% 68% Delete alarm
1.00 1.00 1.00 0.00 100% 100% Tick counter [1 alarm]
5.00 5.00 5.00 0.00 100% 100% Tick counter [many alarms]
2.94 2.00 3.00 0.12 93% 6% Tick & fire counter [1 alarm]
25.00 25.00 25.00 0.00 100% 100% Tick & fire counters [>1 together]
6.44 6.00 7.00 0.49 56% 56% Tick & fire counters [>1 separately]
6.00 6.00 6.00 0.00 100% 100% Alarm latency [0 threads]
6.00 6.00 6.00 0.00 100% 100% Alarm latency [2 threads]
5.83 5.00 6.00 0.28 82% 17% Alarm latency [many threads]
10.01 10.00 11.00 0.01 99% 99% Alarm -> thread resume latency
0.00 0.00 0.00 0.00 Clock/interrupt latency
2.75 2.00 3.00 0.00 Clock DSR latency
208 180 212 Worker thread stack used (stack size 1088)
All done, main thrd : stack used 804 size 1536
All done : Idlethread stack used 164 size 1280
Timing complete - 29320 ms total
PASS:<Basic timing OK>
EXIT:<done>| |  | |
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| 2024-03-18 | eCosPro Non-Commercial Public License |