SD_CARD refuses to mount with fmount returning FR_NOT_READY

[rohan_m]

STM32F7 Series

[SofLit]

Hello,

Try with 1 bit mode. If it does work see this thread.

[rohan_m]

The code fails only after :-

  if (HAL_SD_Init(&hsd) != HAL_OK)
  {
    Error_Handler();
  }
It fails in the HAL_SD_Init() only even after changing to 1B. 

[AScha.3]

So your hardware is not working .

What board : custom or nucleo ...?

Length of tracks cpu -- sdcard ?

+

try simple setup for beginning with sd-card:

- 1 bit mode

- no dma template

- port/pins : all on speed: medium + pullup on

[rohan_m]

Its a custom board 

[rohan_m]

The same problem I am facing after making sure only 1 bit, No DMA and all GPIO pins on medium speed

[AScha.3]

+ Length of tracks cpu -- sdcard ?

Still init not working?

Then first check all signals to sd-card with scope . (10:1 low cap. tip)

If ok (3,3V....etc) look at CMD , here first (400kHz speed) "hello card..." communication;

if this ok, it switching to hi-speed (5...25Mbit), if long lines, then here problems begin to show up.

[rohan_m]

Track length is below 3 inches .

[rohan_m]

I did order a nucloe board and connected an SD card reader to it where I did see that it was connected in the 1bit mode but it was not connecting in the 4 bit mode.

When I am trying to enable the 4 bit mode then it is returning HAL_SD_ERROR_REQUEST_NOT_APPLICABLE

Clock is 108 MHz but I have put a clock div of 16 which makes 108/CLKDIV+2 which makes it 6 Mhz. Please help where we can look next. 

[AScha.3]

-- Which nucleo ?

+ You got it working in 1 bit mode (the standard for sd-card) , good !

Try setting higher speed (i have 100M + div1 -> 50MHz card clk max.) and proof working;

by (only !!) reading files and check speed , you get. (and tell it here.)

If you really  NEED more speed then, try same in 4 bit mode.