DSP/BIOS for C6000/C5000. What is DSP/BIOS Real-time Environment –Thread execution model Threads, Mailboxes, Semaphores –Device independent I/O Logging,

DSP/BIOS for C6000/C5000

What is DSP/BIOS

• Real-time Environment– Thread execution model

• Threads, Mailboxes, Semaphores

– Device independent I/O • Logging, Streaming I/O

• RTDX (Real-time data exchange)

• Real-time Analysis– Debug facility ( with CCS)

• Device Configuration and Management– GUI based configuration in CCS

DSP/BIOS Modules

Kernel Module Description

Hardware Interrupts Interface from hardware interrupts to DSP/BIOS kernel

Software Interrupts Lightweight pre-emptible threads that use program stack

Tasks Independent threads of execution that can yield the processor

Periodic Functions Time-triggered lightweight threads

Mailboxes Synchronized data exchange between tasks

Lock Nestable binary semaphores

Semaphores Counting semaphores

Queues Atomic link lists

Clock Interface to hardware timers

Streams Streaming I/O for tasks

Pipes Streaming I/O for software interrupts

Memory Manager Low overhead dynamic memory allocation

DSP/BIOS Configuration

DSP/BIOS Configuration

DSP/BIOS Real-time Kernel

DSP/BIOS Task Synchronization

DSP/BIOS Real-time Analysis

DSP/BIOS Real-time Analysis Features

• Low overhead (formatting done in IDE)

Real-time AnalysisOperations

C5000CPUCycles

Time (usec)for 100 MHz5410

C6000CPUCycles

Time (usec)for 200 MHz6201

Log operations

LOG_event 59 0.59 33 0.165

LOG_printf 59 0.59 36 0.18

Statistics operations

STS_set 19 0.19 14 0.07

STS_add 42 0.42 15 0.075

STS_delta 48 0.48 21 0.105

DSP/BIOS Execution Graph

DSP/BIOS Statistics View

DSP/BIOS Input/Output Capability

DSP/BIOS I/O Example

AudioFilter( inputPipe, outputPipe )

{

PIP_get(inputPipe); /* dequeue full frame */

PIP_alloc(outputPipe); /* dequeue empty frame */

copy algorithm; /* read/write data frames */

PIP_free(inputPipe); /* recycle input frame */

PIP_put(outputPipe); /* enqueue output frame */

return; /* wait for next frame pair */

}

DSP/BIOS Audio I/O Example

Void audio(PIP_Obj *in, PIP_Obj *out) { Uns *src, *dst; Uns size; if(PIP_getReaderNumFrames(in) == 0 || PIP_getWriterNumFrames(out)==0){

error(); } /* get input data and allocate output buffer */ PIP_get(in); PIP_alloc(out); /* copy input data to output buffer */ src = PIP_getReaderAddr(in); dst = PIP_getWriterAddr(out); size = PIP_getReaderSize(in); PIP_setWriterSize(out,size); for (; size > 0; size++) { *dst++ = *src++; } /* output copied data and free input buffer */ PIP_put(out); PIP_free(in); }

CSL and Peripheral Configuration

Peripheral Configuration using IDE

System Configuration

• Allows detailed specification of target– Memory: Data and Code location

• Generates peripheral initialization code– Interrupts, Timers, McBSP, DMA etc.

• Generates linker configuration file (.cmd)

Conclusions

• Royalty-free real-time kernel for production use• Allows for rapid development of product from

concept• Can be integrated with another real-time OS• Small footprint (can be as small as 1K words)

– Modules used are controlled by the user

• Allows for on-the-fly debug/analysis in the field• Available with C6000 and C5000 processors