Hello iMX engineer.
I am trying to read/write serial flash using QuadSPI of iMX7.
The serial flash is ISSI IS25WP512M.
Please tell me about QSPI of iMX7.
1. When reading the status register, the value of QuadSPI1_LUTKEY changes. Please tell me why it will change.
For example:
QuadSPI1_LUT12 = 1c010405
QuadSPI1_LUTKEY = 5AF05AF0
QuadSPI1_LCKCR = 00000001
QuadSPI1_MCR = 000F4C0C
QuadSPI1_SPTRCLR = 00000101
QuadSPI1_IPCR <- 03000001 WRITE
:
QuadSPI1_LUTKEY 5AF05AF0 changes to 5AF05AF3.
Why? Is something missing?
2.When writing a value with Page Program, 0 is written in the first 16 bytes.
Please tell me why 0 is written.
For example:
Serial flash address 60000000 - ALL "FF" DATA
QuadSPI1_LUT16 = 08180402
QuadSPI1_LUT17 = 00002004
QuadSPI1_MCR = 000F4C0C
QuadSPI1_SPTRCLR = 00000101
QuadSPI1_TBDR <- 32 Times write
128Byte Write
00010203
04050607
08090a0b
0c0d0e0f
00000011
00220033
00440055
00660077
00880099
00aa00bb
00cc00dd
00ee00ff
00000000
00001111
00002222
00003333
00004444
00005555
00006666
00007777
00008888
00009999
0000aaaa
0000bbbb
0000cccc
0000dddd
0000eeee
0000ffff
00111111
00555555
00aaaaaa
00ffffff
QuadSPI1_IPCR <- 04000028 (40Byte write)
Serial flash address 60000000 - 6000000F ALL 00 DATA
Serial flash address 60000010 - 6000001F
DATA
00000011
00220033
00440055
00660077
Why is 0 written to 16 bytes first?
Please give me some advice.
