ADC-Noise of DSP56803

Started by thomaskracke in Freescale DSPs16 years ago 1 reply

Hallo DSP'lers, I'm not very happy with the ADC of the DSP56803. It converts 12Bit, but I get only 7-8 Bits stable. The...

Hallo DSP'lers, I'm not very happy with the ADC of the DSP56803. It converts 12Bit, but I get only 7-8 Bits stable. The manual says: Signal-to-Noise min. 55 dB. This means for me, that at least 9 Bits should be stable. I put a filter with a 56?H coil, a 4.7?F and a 100nF


ADC sync with PWM

Started by Bruno Tremblay in Freescale DSPs17 years ago 1 reply

Hi, I'm trying to use the synchronization feature of the ADC with PWM on a DSP56F805 and I don't find user manual clear on this...

Hi, I'm trying to use the synchronization feature of the ADC with PWM on a DSP56F805 and I don't find user manual clear on this subject. Form what I can understand, the PWM outputs a synchronization pulse connected as an input to the quad timer module C, input of TC2 at each r


56f8300 demo board problems

Started by in Freescale DSPs15 years ago 2 replies

hi! at least i have bought a 56f8300 demo board.... but i could't run exercises for this board... workink exercises folder...

hi! at least i have bought a 56f8300 demo board.... but i could't run exercises for this board... workink exercises folder names(i am downloading these projects to my dsp without any problem.): adc adc with timer LED but when i press debug


DSP56F807: Synchronization of on chip ADC to PWM

Started by wjschint in Freescale DSPs16 years ago

I'm trying to synchronize the ADC's (both A and B) to the PWM, as described in Mot. app. note AN1933/D, section 5.2. I am using ...

I'm trying to synchronize the ADC's (both A and B) to the PWM, as described in Mot. app. note AN1933/D, section 5.2. I am using center-aligned PWM technique (Fig. 5-4 in app note). I want to have a sample at a specific location in each PWM half-cycle. I have two questions related to


ADC fix for 56F805DSPEVM?

Started by millindala in Freescale DSPs15 years ago

Hi, I have observed the ADC fix for 56F827 EVM board in the photos section of this group. Does anybody have a similar...

Hi, I have observed the ADC fix for 56F827 EVM board in the photos section of this group. Does anybody have a similar solution to the DSP56F805 EVM board. If so, kindly add the photo in the photos section. Thanks, mahesh


Help ADC

Started by praveen in Freescale DSPs15 years ago

Hi All I am working on the DSP56F801 processor. Just wrote a simple program for ADC #include #include "port.h"...

Hi All I am working on the DSP56F801 processor. Just wrote a simple program for ADC #include #include "port.h" #include "bsp.h" #include "io.h" #include "fcntl.h" #includ


ADC on 56f805 shift right error

Started by lau_i11 in Freescale DSPs13 years ago 1 reply

Hy everybody I am a student in electrical engineering.This summer I will finish my university an i have to prepare a final project on a...

Hy everybody I am a student in electrical engineering.This summer I will finish my university an i have to prepare a final project on a DSP56f805.I am using the ADC ,but i have a litle problem> for this simple code,Code Warrior give's me 1 error.Does somebody know what sould i do? opcode: #include #include int main(void) { int k,k0; /*Setarea placii Motoro


PWM to ADC sync pulse

Started by Roelof Oelofsen in Freescale DSPs17 years ago 1 reply

Good morning, I am using the PWM on the 56f807 to send out voice band signals and the ADC to sample these signals. At the...

Good morning, I am using the PWM on the 56f807 to send out voice band signals and the ADC to sample these signals. At the moment I am sending it out at 32k samples/sec. I only want to read it at 8k samples/sec though. Is there any way that I can divide the sync pulse that come


RE: DSP56F807: Synchronization of on chip ADC to PW M

Started by Johnson, Jerry in Freescale DSPs16 years ago

RE: [motoroladsp] DSP56F807: Synchronization of on chip ADC to PWM I put the following at the end of my ISR: ...

RE: [motoroladsp] DSP56F807: Synchronization of on chip ADC to PWM I put the following at the end of my ISR:                 bfse


EVM for 56801 - where to buy?

Started by Stefan Stenzel in Freescale DSPs16 years ago 1 reply

Hello, Subject says it all, where can I get one of these in germany? Would also consider 803/805/807 types, I just need 6ch...

Hello, Subject says it all, where can I get one of these in germany? Would also consider 803/805/807 types, I just need 6ch ADC,SPI and some Flash. Thanks, Stefan


ADC problem

Started by praveen in Freescale DSPs15 years ago 1 reply

Hi can anyone help me with this one. I got stuck with this for a week. I am using dsp56f801 . I have an Input...

Hi can anyone help me with this one. I got stuck with this for a week. I am using dsp56f801 . I have an Input voltage(dc) say 1v. scan mode - is sequential once divisor -4 instead of sync i use start command. The problem th


interface between 3.3v and 5v

Started by in Freescale DSPs14 years ago 4 replies

hi.... i'm designing a circuit including 5v and 3.3v for the first time and need support to interact them with each other. except...

hi.... i'm designing a circuit including 5v and 3.3v for the first time and need support to interact them with each other. except dsp all circuit elements feeds from 5v. i'll drive a 2x16 lcd .. i'll read from 4 ADC input and i'll use 4 PWM signal... which buffers (easy to find) should i use? bye...


New MC56F8323 user

Started by emespina in Freescale DSPs15 years ago

Hello! I have just acquired my 56F83x Demo Board. Does anyone have some assembly codes for system initializations and ...

Hello! I have just acquired my 56F83x Demo Board. Does anyone have some assembly codes for system initializations and configuring the ADC and PWM Modules? This will certainly help jumpstart my application development. Thanks in advance!


56F827EVM Fix

Started by Jacob in Freescale DSPs17 years ago

I've posted the picture of the ADC fix Denial described in the photo sections of the group. Jacob

I've posted the picture of the ADC fix Denial described in the photo sections of the group. Jacob


just starting

Started by reeseshad in Freescale DSPs15 years ago 1 reply

Hi, I'm just starting with the DSP56F827EVM, and I am wondering which development software should I start with the SDK or...

Hi, I'm just starting with the DSP56F827EVM, and I am wondering which development software should I start with the SDK or CodeWarrier? My overall goal is to read from the ADC channels and store the results on a SD card (external compactFlash) using SPI to


Random ZEROs in ADC sampling

Started by dsouza81 in Freescale DSPs16 years ago

Hello, When sampling a voltage that is expected to return a value of 30,000, I sometimes get a random 0 result when observing...

Hello, When sampling a voltage that is expected to return a value of 30,000, I sometimes get a random 0 result when observing the varible value, why is this zero occuring and how can one get rid of it for more consistant data. This is with once-sequential sampling


ADC question

Started by david wiernicki in Freescale DSPs16 years ago

Hi. I'm new. :P I'm using a DSP56f805 to do a 6-axis motor controller for a motion platform. I grab analog inputs for...

Hi. I'm new. :P I'm using a DSP56f805 to do a 6-axis motor controller for a motion platform. I grab analog inputs for feedback, pulse width input from a PC for control, and PWM output to run the motors. I'm using Code warrior 5 with SDK 2.5.


56F807 DSP failures

Started by Bende Georg in Freescale DSPs15 years ago 4 replies

Hello all, Recently we have started some test production, and on about 1% of the units claimed to be defective by our test...

Hello all, Recently we have started some test production, and on about 1% of the units claimed to be defective by our test software. I took a closer look on these units and I have noticed a huge offset on 1 or 2 of the ADC channels. At 0V level it showed the same value as the


ADC usage

Started by sowmya_gk in Freescale DSPs15 years ago 2 replies

Respected Sir/Madam, we are working on a project which has 56f805 DSP on the EVM kit. we're new to embedded field. we have a...

Respected Sir/Madam, we are working on a project which has 56f805 DSP on the EVM kit. we're new to embedded field. we have a few queries which need to be cleared to start our project. kindly help us by doing the need. The queries are as follows: 1. A basic sample p


Bug in the DSP56800 sdk2.5 (one of them anyway)

Started by atid2 in Freescale DSPs17 years ago

I found a bug in the ADC driver implementation of the SDK. The settings of the quadTimer that synchronizes the sampling is wrong. ...

I found a bug in the ADC driver implementation of the SDK. The settings of the quadTimer that synchronizes the sampling is wrong. It's set a value determined by the following calculation: BSP_OSCILLATOR_FREQ * PLL_MUL / 8L / ADC_SAMPLING_RATE_PER_CHANNEL. The counter counts back unti