Serial Nor Flash

west build -p -b pinetime samples/drivers/spi_flash -DCONF=prj.conf

Overview

This sample application should unlock the serial nor flash memory. This can be very useful to store e.g. background for the watch.

compilation problematic ….

/root/zephyrproject/zephyr/samples/drivers/spi_flash/src/main.c:17:22: error: ‘DT_INST_0_JEDEC_SPI_NOR_LABEL’ undeclared (first use in this function); did you mean ‘DT_INST_0_NORDIC_NRF_RTC_LABEL’?

Turns out this is some problem with the board definition file.

I found it to be very useful to consult the generated dts file. Here you can check if everything is present.

Guess the dts-file has to be well intended.(structured)

**TIP: consult the generated dts board file **

consulting the generated board definition file

vi /root/zephyrproject/zephyr/build/zephyr/include/generated/generated_dts_board.conf

Requirements

complement the pinetime.dts file with the following (under spi) #define JEDEC_ID_MACRONIX_MX25L64 0xC22017

&spi0 {
  compatible = "nordic,nrf-spi";
  status = "okay";
  sck-pin = <2>;
  mosi-pin = <3>;
  miso-pin = <4>;
  cs-gpios = <&gpio0 27 0>,<&gpio0 5 0>;
  st7789v@0 {
          compatible = "sitronix,st7789v";
          label = "DISPLAY";
          spi-max-frequency = <8000000>;
          reg = <0>;
          cmd-data-gpios = <&gpio0 18 0>;
          reset-gpios = <&gpio0 26 0>;
          width = <240>;
          height = <240>;
          x-offset = <0>;
          y-offset = <0>;
          vcom = <0x19>;
          gctrl = <0x35>;
          vrhs = <0x12>;
          vdvs = <0x20>;
          mdac = <0x00>;
          gamma = <0x01>;
          colmod = <0x05>;
          lcm = <0x2c>;
          porch-param = [0c 0c 00 33 33];
          cmd2en-param = [5a 69 02 01];
          pwctrl1-param = [a4 a1];
          pvgam-param = [D0 04 0D 11 13 2B 3F 54 4C 18 0D 0B 1F 23];
          nvgam-param = [D0 04 0C 11 13 2C 3F 44 51 2F 1F 1F 20 23];
          ram-param = [00 F0];
          rgb-param = [CD 08 14];

  };

  mx25r64: mx25r6435f@1 {
          compatible = "jedec,spi-nor";
          reg = <1>;
          spi-max-frequency = <1000000>;
          label = "MX25R64";
          jedec-id = [0b 40 16];
          size = <67108864>;
          has-be32k;
  };

Building and Running

west build -p -b pinetime samples/drivers/spi_flash

Todo

  • detect ID memory : it is not the macronix one as suggestion on the pinetime website

I found the following : jedec-id = [0b 40 16]; (OK: can execute sample program)

  • create working board definition (OK: see above)