Hello, I am working on a dev board(OM13098). My project is to use the on board serial flash (W25Q128JV-DTR) as a mass storage device through USB port. I combined two example projects together. (lpcxpresso54628_dev_msc_ramdisk_bm + lpcxpresso54628_spifi_polling_transfer) modified lpcxpresso54628_dev_msc_ramdisk_bm a bit in order to access SPI flash data
The test code worked OK on dev board for fast_read_qaud_out, fast_read_dual_out, fast_read, and standard_read. I can see the SCLK/CS/MOSI/MISO SPI signals through a logical analyzer. The pin configuration as following:
P0_23: SPIFI_CSN,
P0_24: SPIFI_IO(0) - MOSI,
P0_25: SPIFI_IO(1) - MISO,
P0_26: SPIFI_CLK,
P0_27: SPIFI_IO(3),
P0_28: SPIFI_IO(2)
Now I need to port above code to our production board. On the board the main clock is 180MHz(the dev board is 220MHz), there are 4 SPI devices share the same SPI bus. SCLK/MOSI/MISO will be shared, each SPI device has it own CS. Also due to hardware limitation, SPIFI_IO(2:3) are not available to the firmware, I cannot use fast_read_quad_output.
The SPI flash pin configuration changed as following:
P2_14:GPIO output connect to SPI flash /CS pin,
P2_15: GPIO output connect to SPI flash /RESET pin
P3_15 FC8_SCK to flash chip CLK pin,
P3_16 FC8_RXD_SDA_MOSI to flash chip DI(IO0).
P3_17 FC8_TXD_SCL_MISO to flash chip Do(IO1)
In my code, I manually set P2_14 to 0 or 1, before and after write/read flash data, or sendCommands to the flash chip. I can see the /CS signals from logical analyzer. but I cannot see CLK and MOSI signals. MISO seems like repeats /CS signals.
What the possible mistakes I made can cause above issue? can you provide a detail steps from
1. how to set Power: In the AHBCLKCTRL0 register
2. how to set SPIFI clock: set up the SPIFI clock using the SPIFICLKSEL and SPIFICLKDIV
registers
3. how to set Pins: Select SPIFI pins and pin modes through the relevant IOCON registers
I noticed that /CS(P2_14) does not on the same FlexComm as SCLK/MOSI/MISO(these 3 are on FC8),
Does this pin config will work? or I need to change /CS to PIO3_18 FC8_CTS_SDA_SSEL0?
Thank you!
