DSP Co-processor for MCU(51)

[davyzhu]

mcu51

Hello all,

The MCUs like 51 have low ability to process the DSP(ex. Audio). But how to choose a easy-to-use and cheap DSP co-processor (I don't mean TI's great DSP).

And do you think the 51+DSP is better than one chip DSP?

Regards,

Davy Zhu

 

[khafaji]

arm with dsp coprocessor

I think that AVR like ATmega16 is good choice
It is very faster than 8051 and has 2-cycle multiplayer.
Also the Analog Devices DSP's is very strong but expensive.

 

[eltonjohn]

There is Cygnal .A company that sells very fast 51 chips faster that any micontroller . I think for audio is possible to implement filters and other basic dsp functions with it .Those chips are very powerful FFts can be calcualted see app note 142
https://www.silabs.com/products/microcontroller/applications.asp

 

[ME]

The 16-bit MSP430 could also be an option like AVR.

If an AVR or MSP430 isn't powerfull enough, you could use the Freescale (former Motorola) 56F8300 hybrid controllers family:
**broken link removed**

1.1 Overview
Motorola hybrid and microcontrollers have a long and
distinguished history in industrial and control applications.
The new 56F8300 Series is the latest addition to the widely
adopted 56F800 portfolio of high-performance, Flash-based
hybrid controllers. The 56F8300 devices combine the
capabilities of a microcontroller with the signal processing
performance of a Digital Signal Processor (DSP), and the raw
protocol and control processing power of a 32-bit RISC.

You could also use an ARM7, Philips makes some very cheap and popular ARM7 MCUs with 10-bit ADC, probaly the cheapest at the moment?:
Philips LPC2000 family: **broken link removed**

Analog Devices makes ARM7 MCUs with built-in 12-bit 1 MSPS ADC and 12-bit DAC. The fast ADC and DAC could be very useful for DSP applications:
**broken link removed**

A lot of other companies also makes ARM7 MCU, for example Atmel.


Microchip also makes the new dsPIC 16-bit Digital Signal Controllers:
**broken link removed**


I would not use a co-processor but rather a one chip design with a Flash based combined MCU and DSP like the ones posted above.
All these devices can do all the tasks you 8051 can do + plus a better "DSP engine".

If you want to process audio you should probably choose at least 16-bit and maybe 32-bit MCU/DSP like dsPIC, Freescale, ARM etc.
You will also need a high resoloution codec.

 

[eltonjohn]

You can start with this .. and then upgrade to a more powerful micro !

http://elm-chan.org/works/vp/report.html

 

[777]

See Goal's 8051-compatible uC with MAC and Barrel shifter
www.goalsemi.com

 

[hmahdi12]

It's better than you use FPGA &
for MAC you can use valace-tree for your multiplayer.

 

[Ace-X]

Depends on what kind of DSP processing you actually need. For example, many sophisticated DAM (digital answering machine) DSPs have 8051-compatible bus for external control. One of our system has 8051 from Atmel as a main control processor and DSP from DSPG for phone functions.

Ace-X.

 

[jetset]

You can try the new family of Hybrid controllers of Freescale (Motorola),
56800E.
"The 56F8347, a member of the 56800E core-based family of Hybrid Controllers, combines the processing power of a DSP and the functionality of a microcontroller. In a 160-pin LQFP package, the 56F8347 features 156 KB of on-chip Flash memory. Additionally it features pulse width modulation (PWM) outputs, analog-to-digital converter (ADC) inputs and timer channels, along with the ability to interface with other devices in your system via the external memory interface."