Questions tagged [sharedbus]

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votes
3answers
167 views

Best approach for sharing SPI bus across multiple sensors

I'm designing a few PCBs for a project: Microcontroller PCB (SPI master) Sensor PCB, where each sensor PCB has several SPI slaves on it. In a full system, there would be 3 sensor PCBs directly ...
2
votes
1answer
608 views

How can multiple ICs access shared RAM?

I'm trying to build a game console from scratch (as an exercise, not necessarily for practicality). What I want to do is to have multiple "CPUs", in this case one being the Main CPU and the other one ...
0
votes
1answer
181 views

MCU to MCU I2C communication

I have 2 MCUs and I want to connect them together over I2C bus. MCU1 will be Master while MCU2 will be Slave. Only these 2 MCUs are on the bus. This configuration is fixed and I cannot change it. ...
7
votes
7answers
489 views

Way to determine order of cards plugged into controller board

REVISED: I have a master controller PCB with four bus bars (+, -, and two signal lines), see image below. I have module PCBs A-C (or could be 10 or 15 of them), each with MCUs and unique identifiers, ...
-2
votes
2answers
90 views

CAN Bus Frame Error [closed]

3.3 CAN Controller. Recessive state 1.85V...Talking to third party 5V CAN. Recessive state 2.4V. Both have dominant differentials of >= 2V. Two 120 ohm resistors on bus, 63 ohm resistance throughout. ...
5
votes
1answer
234 views

PCB ground connection for shared power/data bus system

I have a wireless device that is connected to a shared power and data bus, similar to below. The bus can be shared by up to 5 devices and I don't know what it will be connected in advance. I connect ...
1
vote
3answers
357 views

Multiple I²C slaves with different addresses VS. using a multiplexer

I'd like to interface a lot of identical I²C sensors, let's say 32, with a MCU that has only 2 I²C busses. I can configure each sensor to have up to 8 different addresses. Hence I can have 8 sensors ...
1
vote
1answer
184 views

4 bit SD card - sharing the interface?

I've done a lot of googling and the answer just isn't jumping out at me. I've got a project that has two SD card slots. Access to the two cards is never simultaneous. I'm upgrading this project to an ...
4
votes
1answer
88 views

Coprocessor Synchronization

I have a coprocessor that uses some dedicated hardware 65c618 core that starts up in a halted state. Through a dedicated bus I can control the coprocessor I-RAM which is needed to setup the processor ...
0
votes
1answer
122 views

How can I use a single 74595 to drive two different IC's?

I'm trying to build an audio circuit with as few parts as possible. Also, I really need to limit the number of pins used on my Arduino. I didn't ask this in the Arduino site because I don't think ...
2
votes
2answers
1k views

Sharing DDR3 memory between two sources

I have an FPGA and a powerful ARM processor both support DDR3. I am an experienced designer for smaller more embedded designs with less powerful CPUs but this is my first rodeo with a powerful ARM and ...
5
votes
4answers
4k views

RS232 and RS485 over same pins

I have 2 pins and primary function should be A/B RS485, but is possible that I also put RS232 (Rx/Tx) chip on same bus and then control which one I want to use from microcontroller. I was thinking ...
7
votes
6answers
1k views

Multi node bus options

I want a master node consisting of a TI Stellaris Cortex M3 core connected to what can be up to 32 slave nodes of TI MSP430 (or possibly more Stellaris slave nodes). These will be maximally 0.5 meters ...
9
votes
5answers
5k views

SRAM which two chips can read/write

I'm looking for a small, 32KB or so SRAM device that two MCUs can read or write (at two different times; I don't need simultaneous reading/writing.) It would be good if it used a serial interface as ...