QUAD SPI read not working

[Devika Raju]

Hi all,

I am working with STM32L476RG and using ST32cubeIDE for developing project. I am trying to enable Quad SPI in my project . I am using MX25R8035FM1IL0 as flash memory. I followed the code in the software package of ST, but it is not working.

When i am reading from reception buffer i am receiving nothing.

my Quad SPI configurations;

• prescalar -2
• flash size -14
• fifothreshold- 4

i am using instruction , address and data on a single line. when i tried address and data modes with 4 lines, in the reception buffer i am getting value 136 in decimal

Rx and Tx callback are coming when i checked with break points.

I am unable to find the issue in my code .

can anybody help me?

This is the Reference code i used from ST: STM32Cube_FW_L4_V1.15.0\Projects\STM32L476G-EVAL\Examples\QSPI\QSPI_ReadWrite_IT

[Tesla DeLorean]

Reading 0x88 suggests it is not in quad mode.

I'd bring the interface up in 1 and 2 bit​ modes, and in polled rather than interrupt.

[Andreas Bolsch]

I'm afraid your description is far away from being useful. What does "i am receiving nothing" actually mean? Did you check signals with a scope?

4-line mode is sort of advanced topic. Try to get 1-line mode working first, and only if reading and programming etc. works in 1-line mode, attempt using 4-line mode. 136 = 0x88 probably indicates the flash doesn't drive the data lines.

[Devika Raju]

Thank you for your reply.

i am receiving nothing means i am receving 0s in reception buffer . i didn't check signals with scope.

i will try your suggestions and come back to you