I want to use one SPI port with one chip select to control ADC and DAC converters. I would connect ADC to MISO pin of DSP, DAC to MOSI pin. Is this in general possible?
Related
I made an ethernet PCB passthrough circuit board that has an input connector, the correct magnetics to isolate the signal on both ends, and an output connector. I'd like to test my board by sending data into it and measure the packets on the output to make sure nothing is being lost.
I have Wireshark on my computer but I'm not sure how to inject a certain number of packets into the input or how measure it on the output to look for lost packets. I can connect on both ends to laptops but there is no IP address on my board, it's just hardware.
Is there a way (or trick) to set a CH340 to 25000 baud on Linux?
If not:
Is there a better chip which is able to do that 25000 baud (no FTDI please)?
Is there a completely different and better way to achieve my goal (see below)?
Background:
I would like to interface a China Diesel heater to a Raspberry Pi (OpenPlotter on a ship).
This was done in Open Source with a uC (STM or EsP32) with http://www.mrjones.id.au/afterburner/
There is this blue wire with half duplex RS232#TTL and baud rate of 25.000 baud (8N1). This is the binary, proprietary communication interface to the heating.
I tried to use one of this china USB to RS485 adapters which use a CH340C internally.
The interface of Afterburner:
The USB to RS485 interface is similar Afterburner:
I think I should be able to use this interface without major modifications if I would use "channel B" of RS485 with a pull up resistor (worth a try).
My main problem is the baud rate at the moment. I think I will run in the same problem if I would use a CP210x. I guess a FTDI232 might be able to handle this baud rate but I will not use this chip at all.
My other idea was to use a NodeMCU (CH340 with ESP32/ESP8266) and speak 25000 baud to the heating and 28800 over the serial to USB of the NodeMCU. I think this is a little bit overkill to do it this way.
Is it possible to use DMA with the SPI interface on TMS320C55xx DSPs? I see that the DMA controller has events for I2C, I2S, UART, MMC, SD, and internal and external memory, but SPI seems a curious omission; likewise SPI is not listed in the memory map for the DMA controllers.
I am trying to connect MQ5 sensor to a Telosb and read the values, and i am using contiki os.
My problem now is:
I know that i need an ADC driver in contiki os, but i do not know how to do it or from where to start ?
Can anyone guide me please?
The ADC driver for TelosB is already implemented in Contiki, you can find it in file sky-sensors.c and sky-sensors.h in contiki/platforms/sky.
See light-sensor.c and temperature-sensor.c for examples of sensor drivers that use this "sky_sensor" API. Basically you need to select which ADC input channel to use and what reference voltage to use, the rest is trivial: call sky_sensors_configure function and read from the right memory location mapped to an ADC input port. For example, by reading ADC12MEM4 you can access the ADC channel 4.
My project is to capture images and process them to move a wheelchair accordingly. I am using Nexys2 FPGA board for this purpose. Nexys2 has a usb port and the camera is also a usb camera. but i dont have the drivers in verilog which will make nexys2 and the camera communicate with each other. Please help me ill be very grateful.
Well, if you manage to write a driver for a USB camera in VErilog, you can sell that for a lot of money :)
Well, sarcasm aside, there is NO WAY you can access a USB camera in Verilog, unless you have a USB host implemented in your FPGA and have a CPU controlling it and have a SW driver for that camera.
There are alternatives to this, you can buy a camera which has an FPGA "friendly" connector like this one:
5 Mega Pixel Digital Camera Package
Which comes with the Verilog code that you can use in your project.
Sadly, the USB port on the Digilent Nexus 2 board does not have host capabilities, it can only act as a USB slave. The USB connection on the board is used for powering the board and configuring the FPGA and other onboard peripherals.
The newer Nexus 3 board has a second USB port however it has the same issue in that it can only act in slave mode. Also due to the configuration can only be used for mouse and keyboard input.