Our apologies, but this particular version of the DSP/BIOS is no longer available. Please select DSP/BIOS 5 or DSP/BIOS 6 from below.
特性
DSP/BIOS Kernel Overview
DSP/BIOS provides a rich set of C-callable deterministic kernel services that enable developers to create sophisticated applications without compromising real-time deadlines. DSP/BIOS is highly scalable with multithreading configurations requiring as few as 1K words.
DSP/BIOS is configurable to minimize memory footprint. Configuration can be done either statically through graphical or scripting tools or dynamically using operating system calls. In addition to excluding unused modules, static configuration further reduces target memory footprint by eliminating the code required to dynamically create and delete operating system objects such as threads and semaphores.
DSP/BIOS includes the following kernel modules:
Kernel Module
Description
Hardware Interrupts (HWI)
Interface from hardware interrupts to DSP/BIOS kernel
Software Interrupts (SWI)
Lightweight preemptible threads that use program stack but cannot yield
Tasks (TSK)
Independent threads of execution that can yield the processor
Periodic Functions (PRD)
Time-triggered lightweight threads
Message Queues (MSGQ)
Variable-length zero copy messages
Mailboxes (MBX)
Synchronized data exchange between tasks
Locks (LCK)
Nestable binary semaphores
Semaphores (SEM)
Counting semaphores
Queues (QUE)
Atomic link lists
Clock (CLK)
Interface to hardware timers
Streams (SIO)
Streaming I/O
General I/O (GIO)
Extensible I/O module with support for asynchronous I/O & synchronous read/write
Memory Manager (MEM)
Low overhead dynamic memory allocation
Buffer Manager (BUF)
Fast, deterministic fixed-size buffer allocation
Power Manager (PWRM)
Power management functions
Cache Control (BCACHE)
Cache configuration and management
DSP/BIOS Multithreading
To provide the fast response required by DSP applications, DSP/BIOS augments the traditional tasking model with additional threading mechanisms. Software Interrupts are lightweight pre-emptible threads that share a common stack. This results in lower memory overhead and faster context switch times, as there is no need to save and restore a task stack. Periodic Functions are time-triggered high-priority threads that can be easily set up to process samples of data arriving at fixed time intervals, simplifying the design of multirate systems.
DSP/BIOS IPC Mechanisms
DSP/BIOS offers several IPC mechanisms for interthread communication. Semaphores and Locks provide basic synchronization and resource locking. Mailboxes enable synchronous transfer of fixed sized messages between tasks. Message queues enable zero copy, variable-length message passing between any DSP/BIOS thread type. The exact memory for each message is allocated when the message needs to be sent. Message passing is transparent at the application level and can be within a single DSP or between multiple DSPs. For inter-DSP communication, a Message Queue Transport is required. Some of these (for example, Serial Rapid IO) are available pre-tested from TI.
DSP/BIOS Multicore Support
DSP/BIOS fully supports TI’s multicore DSP solutions. For devices designed to execute the same image on multiple cores, DSP/BIOS provides shared image support, maximizing the amount of local core memory available for data. In addition, a shared memory transport is provided to enable core-to-core communication using the DSP/BIOS MSGQ module. This transport utilizes the underlying hardware features such as atomic access monitors or hardware semaphores to provide the most efficient implementation.
DSP/BIOS Interrupt Management
DSP/BIOS includes a comprehensive set of services for interrupt management. The interrupt dispatcher enables developers to write ISRs in C by performing low-level operations such as context save/restore and temporary disabling of the scheduler. This approach reduces code size by eliminating the need to specifically add such code to each ISR. To reduce data memory requirements, all ISRs use a common stack rather than the stack of the task they interrupt, with the exception of the first interrupt context, which is stored on the task stack for performance reasons. The HWI and Event Combiner modules provide additional APIs for enabling/disabling interrupts and multiplexing multiple interrupt sources on to a single pin.
DSP/BIOS Power Management
For TI DSPs used in portable applications where power consumption is a key consideration, such as the TMS320C5509, DSP/BIOS offers a range of power management features. These may include automatically idling the CPU when in the IDL task, voltage and frequency scaling APIs, sleep or hibernate APIs, automated idling of peripherals when the peripheral domain is not in use, and a register/notify mechanism for coordinating complex system-wide power management.
DSP/BIOS OS-aware Analysis & Debug
In conjunction with Code Composer Studio, DSP/BIOS provides several tools to aid debugging and optimization of multithreaded applications. The Kernel Object Viewer enables a developer to check the status of OS objects such as tasks, mailboxes, and semaphores, including whether a task is ready, running, or blocked, and which tasks are blocked on an IPC. The Real-Time Analysis tools display the thread execution and switching sequence, average and maximum execution times for a thread, and system CPU load, as well as providing a very low overhead printf capability.
DSP/BIOS Link
Many DSP-based applications, ranging from digital cameras to communications switches, use a microprocessor (GPP) to control one or more DSPs. To meet this need, TI is increasingly delivering devices that offer an ARM and DSP core in the same package. DSP/BIOS Link is software designed to facilitate communication between the ARM and the DSP in SoC devices.
To develop applications that reside on GPP+DSP solutions, developers must implement communications software that enables data and control information to be exchanged between the GPP and the DSP. In addition, the GPP must also boot the DSP and often control which algorithms the DSP executes for a specific task. DSP/BIOS Link eliminates the need to create these functions from scratch by providing a robust set of MCU-DSP communications services including:
Variable-length messaging between the GPP and DSP
Ring buffer communication between GPP and DSP
Point-to-point, asynchronous data streaming between the GPP and DSP
Bootload the DSP from GPP
Pre-tested GPP-DSP communications driver support for select devices
DSP/BIOS Link is available for both SoC devices, such as DaVinci, where the ARM and DSP communicate using shared memory, and discrete DSPs offering a PCI interface. DSP/BIOS Link is provided as a source code porting kit and includes pre-tested ports for some versions of embedded Linux.
可用更新
Our apologies, but this particular version of the DSP/BIOS is no longer available. Please select DSP/BIOS 5 or DSP/BIOS 6.
