QSPI does not work in quad mode on NRF52840

RE: QSPI does not work in quad mode on NRF52840

rgujju — Tue, 08 Jun 2021 16:07:53 GMT

The connection was a problem. Fixed it by resoldering!

RE: QSPI does not work in quad mode on NRF52840

rgujju — Mon, 07 Jun 2021 17:48:19 GMT

Did some more experiments. The example does not work when i use rand() as follows.

for (i = 0; i < QSPI_TEST_DATA_SIZE; ++i) {
    m_buffer_tx[i] = (uint8_t)rand();
}

Logs:

[22:48:43:938] <info<0xfe><info> app: QSPI write and read example using 24bit addressing mode␍␍␊
[22:48:43:996] <info> app: QSPI example started.␍␍␊
[22:48:43:999] <info> app: temp: 0x00␍␍␊
[22:48:44:003] <info> app: Process of erasing first block start␍␍␊
[22:48:44:254] <info> app: Process of writing data start␍␍␊
[22:48:44:264] <info> app: Data read␍␍␊
[22:48:44:264] <info> app: Compare...␍␍␊
[22:48:44:264] <info> app: TX:␍␍␊
[22:48:44:264] <info> app:  00 2D CF 46 29 04 B4 78|.-.F)..x␍␍␊
[22:48:44:268] <info> app:  D8 68 A7 FF 3F 2B F1 FC|.h..?+..␍␍␊
[22:48:44:278] <info> app:  D9 7A 96 09            |.z..    ␍␍␊
[22:48:44:278] <info> app: ␍␍␊
[22:48:44:278] <info> app: ␍␍␊
[22:48:44:278] <info> app: ␍␍␊
[22:48:44:278] <info> app: RX:␍␍␊
[22:48:44:282] <info> app:  00 2C 46 20 44 88 86 8A|.,F D...␍␍␊
[22:48:44:287] <info> app:  7F C3 F2 F1 0D 97 A9 6F|.......o␍␍␊
[22:48:44:294] <info> app:  FF FF FF FF            |....    ␍␍␊
[22:48:44:294] <info> app: Data inconsistent␍␍␊

But if i make it a static data as follows (0xA5 is an example), then the data written and data read are consistent in Quad I/O (READ4O and PP4O).

for (i = 0; i < QSPI_TEST_DATA_SIZE; ++i) {
    m_buffer_tx[i] = 0xA5;
}

Logs

[22:50:43:719] <info<0xfe><info> app: QSPI write and read example using 24bit addressing mode␍␍␊
[22:50:43:772] <info> app: QSPI example started.␍␍␊
[22:50:43:779] <info> app: temp: 0x00␍␍␊
[22:50:43:783] <info> app: Process of erasing first block start␍␍␊
[22:50:44:033] <info> app: Process of writing data start␍␍␊
[22:50:44:044] <info> app: Data read␍␍␊
[22:50:44:044] <info> app: Compare...␍␍␊
[22:50:44:044] <info> app: TX:␍␍␊
[22:50:44:044] <info> app:  A5 A5 A5 A5 A5 A5 A5 A5|........␍␍␊
[22:50:44:053] <info> app:  A5 A5 A5 A5            |....    ␍␍␊
[22:50:44:053] <info> app: ␍␍␊
[22:50:44:053] <info> app: ␍␍␊
[22:50:44:053] <info> app: ␍␍␊
[22:50:44:053] <info> app: RX:␍␍␊
[22:50:44:061] <info> app:  A5 A5 A5 A5 A5 A5 A5 A5|........␍␍␊
[22:50:44:067] <info> app:  A5 A5 A5 A5            |....    ␍␍␊
[22:50:44:067] <info> app: Data consistent␍␍␊

RE: QSPI does not work in quad mode on NRF52840

rgujju — Mon, 07 Jun 2021 10:51:19 GMT

I am using the examples/peripheral/qspi example from the SDK.

It works in normal SPI mode (Fast read and Page Program) But when i try in QSPI mode ( READ4O and PP4O) it does not work.

RE: QSPI does not work in quad mode on NRF52840

Simonr — Mon, 07 Jun 2021 07:29:12 GMT

What data, and how are you trying to write over QSPI? Please note that all memory access by the QSPI peripheral should be word-aligned to the external memory address space, so you can only write/read in full 32-bit words. This is described in detail in section 4.3.1 in the nRF52840 product specification.

Best regards,

Simon

RE: QSPI does not work in quad mode on NRF52840

rgujju — Fri, 04 Jun 2021 07:21:06 GMT

Hi Simon,
Yes it is a NOR flash.
Here's the datasheet https://datasheet.octopart.com/W25Q32JVSSIQ-Winbond-datasheet-113071625.pdf

This is my pin mapping:

/CS -> 0.20

DO (IO1)I/O -> 0.22

/WP (IO2) -> 0.24

DI (IO0) -> 0.17

CLK -> 0.15

/RESET(IO3) ->0.13

RE: QSPI does not work in quad mode on NRF52840

Simonr — Fri, 04 Jun 2021 07:09:16 GMT

Yes, sorry. I meant nrf_serial_flash_params.c/.h of course. The W25Q32 is a NOR flash, right? Do you have the datasheet of the W25Q32 available, and can link to it/upload it here?

What pins on the nRF52840 are you using for QSPI communication?

Best regards,

Simon

RE: QSPI does not work in quad mode on NRF52840

rgujju — Thu, 03 Jun 2021 10:57:34 GMT

Hello Simon,

I changed the params in nrf_serial_flash_params.c to

.read_id = { 0xEF, 0x40, 0x16 },
.capabilities = 0x00,
.size = 32 * 1024 * 1024,
.erase_size = 4 * 1024,
.program_size = 256,

but still it does not work.

I am using the examples/peripheral/qspi

RE: QSPI does not work in quad mode on NRF52840

rgujju — Thu, 03 Jun 2021 06:31:02 GMT

Hi Simon,

There is no such file in the SDK. I am using nRF5_SDK_17.0.2_d674dde.
Do you mean nrf_serial_flash_params.c?

RE: QSPI does not work in quad mode on NRF52840

Simonr — Thu, 03 Jun 2021 06:02:16 GMT

Have you modified the parameters in nrf_serial_params.c in the SDK? When using an external flash different to the one on the MX25R6435F which is on the nRF52840 DK by default, you will likely also have to edit the parameters of your nrf_serial_params.c file to make it fit the parameters of the one W25Q32. Please make sure that the read ID, capabilites, size, and erase/program sizes are correct according to the external flash chip's datasheet.

Best regards,

Simon