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Questions tagged [sdio]

Secure Digital Input Output extends the SD card specification to cover input/output functions.

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stm32h7 sdmmc DATA problem

Im trying to send data with sdmmc and i cant see anything happening in data line on oscio. CMD and CLOCK working fine but data just doesnt reacting. this is how clock and cmd looking like (no data ...
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Issue in integrating USB with SD card using STM32F4 [duplicate]

I am currently working on a project that involves integrating USB functionality for data transfer and data logging on an STM32F407VG micro-controller. Specifically, I want to log data files on an SD ...
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Issue in USB_OTG_FS and SD card Integration

I am currently working on a project that involves integrating USB functionality for data transfer and data logging on an STM32F407VG micro-controller. Specifically, I want to log data files on an SD ...
Embedded_Engineer's user avatar
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SD Card with SDIO Interface Issues on STM32F446RET6 PCB

We are currently working on a PCB that has an STM32F446RET6 MCU. The PCB is equipped with various sensors for data collection. Additionally, we are using an SD card for data logging and have opted for ...
Burak Kayaalp's user avatar
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SD Card CLK stops working properly on STM32F4 with SDIO connections

I have an SD Card socket connected to STM32F4 with the connections as follows: The firmware uses the following codes to initialize the SDIO: ...
Patratacus's user avatar
8 votes
4 answers
1k views

Why application notes advise series resistance to be added on clock lines for high-speed interfaces, like SDIO, and not on data lines?

Many application notes (like this one) advise series resistance to be added on the clock line, close to the source. I do understand that this resistance is added there to match the source impedance to ...
Ivan Vlaykov's user avatar
1 vote
0 answers
263 views

How do I communicate with the Wifi module on an stm32mp157f-dk2 board in bare metal?

I'm trying to establish communication with the WiFi module on an stm32mp157f-dk2 board. I must be doing something wrong because I always get a timeout from SDMMC2. I attempt to send 2 commands, the ...
Hammdist's user avatar
1 vote
1 answer
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Sequential writing from different hosts to one SD/SDIO

I was wondering if it is possible to access one SD card via two or more hosts via some sort of hub and write to it data sequentially (i.e host1 writes a bulk then hostN writes another bulk)
Ma250's user avatar
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WL1837MOD SDIO Control(or Wifi module in general)

There are a number of wifi module which are controlled by SDIO(as an option). I am using the WL1837MOD as a specific example but I welcome more general answers. All the documentation for this chip ...
FourierFlux's user avatar
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2 answers
589 views

Do SDIO bus speeds need to match between two devices?

I have two devices that I'd like to use together, connected via their SDIO pins. The MCU can transfer data up to 200 MB/s with a 200 MHz clock speed (HS-200). The wireless module that I want to use ...
scpaulson42's user avatar
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microSD card communication problem

I am developing an embedded system and attaching a uSD-card to it in SD mode (not SPI). The requirement is such that I have to switch the uSD card connectivity between two ports so I am using 74HC4053 ...
UmairKhan's user avatar
2 votes
1 answer
419 views

Clock line of SDIO bus has worse rise/fall time than rest of bus

I have an ATWILC3000 wifi module connected to a Raspberry Pi Compute Module 3+ over 4-bit SDIO. It's throwing a lot of bus errors at higher frequencies (currently running at 1 MHz for stability when ...
Joe Baker's user avatar
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2 votes
1 answer
882 views

STM32 SDIO works only while probing clock signal

I have a custom board with an STM32F407VGT6 and an SD card slot. I noticed that I can only access the SD card if I have a scope probe attached to the clock signal. Holding a scalpel blade between my ...
Crazor's user avatar
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1 vote
2 answers
2k views

Purpose of resistors on SDIO lines and antenna matching circuit?

What is the purpose of R40....R45 and pull-up resistors R46....R50 on SDIO lines as shown below? Is it really necessary to have L51, C52 & C53 matching circuit for antenna?
Lalit's user avatar
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Can I connect two MCUs directly to one micro SD card without additional components?

I am new to this community so I am sorry if I'm asking in a wrong place or something out of topic. I think I have considered everything. :) So, now the basic info: I am working on a project which ...
Dada Kräuter's user avatar
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1 answer
178 views

Interfacing SD card with STM32F44

I'm using STM32F44VET6 controller(using cubemx code configurator), I need to interface a 64GB SD card,and this controller has SDIO pheripheral also But I'm confused how to choose interface type SPI ...
aryan's user avatar
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STM32 SDIO FATFS

I'm using SDIO (1-bit mode) with an STM32F429 Discovery board to read from and write to an SD card. The code below works, I've seen that it does, the problem is it seems to randomly choose when to ...
BdT141's user avatar
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3 votes
1 answer
1k views

STM32 SDMMC & SDIO - why max 1 SD card only?

I'm writing an SDMMC driver for my C++ RTOS for microcontrollers and there is one thing which really puzzles me, making it hard to decide about class hierarchy. In the Reference Manual for STM32F7 (...
Freddie Chopin's user avatar
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1 answer
3k views

How to write data to end of line of existing file (STM32CubeMX FATFS SDIO issue)?

I have successfully coded write data into a CSV file is an SD card using STM32 CubeMS FATFS SDIO interface 1-bit mode. But I can't find the file append function in HAL FATFS driver to write data to ...
vassidefuk's user avatar
1 vote
1 answer
2k views

Wi-fi chipset with SDIO interface in SPI bus mode

I want to connect a Wifi-chipset, which offers an SDIO interfaces to a microcontroller that only supports SPI. As far as I understand from the specifications, every SD card can be connected to a host ...
oh.dae.su's user avatar
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1 answer
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STM32F407VG SDIO read and write speed

I am writing the on board accelerometer data to my SD card. I am using a STM32F407VG board. The data is being written and read. How can I measure or test the speed of reading and writing data to the ...
Sameena Shaikh's user avatar
2 votes
1 answer
1k views

SD card suddenly stops responding to CMD0 (RESET/SPI)

A device I had been testing for over two months suddenly started giving FR_DISK_ERR (I'm using Elm Chan's FAT-FS) [Link]. When I tried debugging, the command (CMD0) which must be clocked in to set the ...
clamentjohn's user avatar
5 votes
2 answers
19k views

Micro SD card operating voltage: 1.8 V specified?

All manufacturer SD cards work in 3.3V based on SD specification. In our recent design we have tested SD card connector power to 1.8V, I thought no SD card will boot but some of the SD card are boot ...
Ram_HW's user avatar
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1 vote
1 answer
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SDIO bit banging

I need to interface a wifi chip to my ARM 9 board, it does not have in built SDIO so i am thinking to interface via bit banging. Questions: Is it possible to interface SDIO via bit banging If not ...
Transformer's user avatar
2 votes
1 answer
2k views

Using ESP32 as a wifi/bluetooth modem? [closed]

I'm would like to make a connection between a ESP32 and a Allwinner A20 CPU in which the ESP32 would provide the Wifi/Bluetooth connectivity for the rest of the system. They both mention ...
TheMeaningfulEngineer's user avatar
1 vote
1 answer
842 views

SDIO slave busy state

How SDIO slave device can inform master that it's busy? As far as i remember in some MMC standard there was a information that it can assert SDIO_DATA0 low. Is this assertion possible in every time in ...
s.paszko's user avatar
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2 votes
0 answers
3k views

Why is SDIO used with WiFi chips

SDIO standard is specifically meant for devices like camera that have an SD card. Still in many of the applications I found that the SDIO is also used to interface with WiFi chips. Why is that so? Can ...
Parth Shah's user avatar
1 vote
0 answers
1k views

STM32F401 SDIO with DMA

Please need help in: Do somebody have a a working code that writes to sd card via sdio using FatFs and DMA?( data logger) In a poling mode (without DMA) I am writing to .bin file and getting error ...
Anna's user avatar
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2 votes
2 answers
4k views

Use SDIO pheripheral for quad SPI flash memory

I am currently doing a project using the STM32F103 micro-controller. The project requires external flash memory to store images and data for later showing on LCD. The problem I have is that I want ...
James Attard's user avatar
1 vote
2 answers
1k views

ATMEGA328P SPI MMC/SDIO

I want to connect an ATMEGA328P to a mobile phone, a Samsung Galaxy S3 to interface some data. I need to use the microSD port behind the battery cover for this purpose, so here is the question, Is it ...
www.jensolsson.se's user avatar
5 votes
1 answer
19k views

What is the difference between 1-bit SDIO vs SPI?

What exactly is the between 1-bit SDIO vs SPI? Does one have advantages/disadvantages over the other?
hassan789's user avatar
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13 votes
2 answers
43k views

Difference between 1-bit, 4-bit and 8-bit SDIO

Please help me understand the significance of 8-bit SDIO over 1-bit and 4-bit SDIO. Let me know the pros and cons of each type. Wiki or SDIO specification document does not discuss this.
V V Rao's user avatar
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