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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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0answers
68 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 (...
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1answer
157 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 ...
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1answer
489 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 ...
0
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1answer
347 views

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 ...
2
votes
1answer
465 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 ...
2
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2answers
4k 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 ...
0
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1answer
359 views

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 ...
2
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1answer
1k 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 ...
1
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1answer
310 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 ...
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0answers
1k 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 ...
0
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0answers
333 views

STM32F4 Data logging to SD card

My system is microphone - stm32f401 nucleo board - SD card I am using ST extension board for mems mic and software STM32CubeExpansion_MEMSMIC1_V1.2.0. This open source soft is acquires the mic and ...
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0answers
829 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 ...
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2answers
1k 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 ...
1
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2answers
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 ...
4
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1answer
8k 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?
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2answers
23k 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.