Hello Team,
I have a requirement to port the renesas IDT70V28 dual-port RAM, I dont have any previous exp regarding this RAM porting.
I want to interface this using GPIO PINS.
I have no idea how to start with it and we are using our custom baseboard using verdin imx8mp SOM.
can Anyone suggest me how to interface this.
Thanks in Advance.
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Hello,
To interface the Renesas IDT70V28 dual-port RAM with your Verdin iMX8MP SOM using GPIO pins, you can follow these steps:
Understand GPIO Basics on Torizon OS: Begin by learning how GPIO works on Torizon OS. The libgpiod library is a helpful tool for managing GPIO pins, offering a straightforward API for GPIO operations. You can use command-line tools like gpioset and gpioget to control GPIO pins.
Device Tree Overlays: Configure the GPIO pins through device tree overlays. This involves defining the pins you want to use as GPIO in the device tree. The device tree is a data structure for describing hardware, and overlays allow you to modify it without altering the base device tree.
Pinmuxing: The i.MX 8M Plus SoC allows for flexible pin configurations. Set the correct pinmux settings in your device tree overlay to ensure the pins are configured as GPIO.
Hardware Setup: Connect the RAM to the GPIO pins on your custom baseboard. Ensure that the connections are correct and that the GPIO pins can handle the electrical requirements of the RAM.
Testing and Validation: Use the libgpiod tools to test the GPIO pins. Verify that you can control the pins as expected before attempting to communicate with the RAM.
Developing the Interface Logic: Once the GPIO pins are configured and tested, develop the logic to interface with the RAM. This involves writing software to manage data transfers between the SOM and the RAM using the GPIO pins.
This process requires careful planning and testing, especially when dealing with hardware interfaces. Adjust your device tree overlay or GPIO configurations as needed if you encounter specific issues.
Best regards,
Toradex AI Assistant
Please, also check if these links can help you solve your problem:
Hello All,
Any inputs on this?
Hi @premsai,
Unfortunately, we also dont have experience on this topic.
Hi @sahil.tx,
Thanks for the reply, we are now aware of how to configure it.but facing issues while accessing gpio pins.
Could you please help me in this issue?
Hi @premsai,
For GPIO, please refer to the below article
GPIO (Linux)
Hi @sahil.tx
Any inputs on this?
H @premsai,
Are you asking for sample code to read/write to external RAM using GPIO pins?
Sorry, we dont have any samples related to this topic.
However, for controlling GPIO , you can refer the same article shared previously.
Hi @sahil.tx ,
we have developed a sample code for write/read to external DPRAM, but we are facing issues while reading.
while writing to the different locations and reading is properly happening.whatever the last data value i have assigned that is the value only displaying from the everylocation
Eg:root@verdin-imx8mp-15460537:~# ./prem
Writing data 0xAB to address 0x1234…
Writing data 0xCD to address 0x5678…
Writing data 0xEF to address 0x9ABC…
Reading data from address 0x1234…
Read value from address 0x1234: 0xEF
Reading data from address 0x5678…
Read value from address 0x5678: 0xEF
Reading data from address 0x9ABC…
Read value from address 0x9ABC: 0xEF
Reading data from address 0x1234…
Read value from address 0x1234: 0xEF
Reading data from address 0x1234…
Read value from address 0x1234: 0xEF
what could be the routecause for this issue?
I dont know your code, so its difficult to comment.
Please check your signals with a logic analyzer or oscilloscope.
For the starting you can check only the control signals (CS, OE, R/W, interrupt & busy flags, etc).
Compare the output observed with the timings/waveform diagrams given in the datasheet of Renesas IDT70V28 dual-port RAM.
