Hi,
I am working on a custom board based on the nRF5340 using Zephyr RTOS with external QSPI NOR flash.
I am facing an intermittent issue with the external flash.
Observed issues:
- Read data does not always match written data
- Sometimes flash initialization behaves inconsistently
- Occasionally the flash appears unresponsive after power-on reset
- Manual reset sometimes fixes the issue temporarily
- Issue is intermittent and difficult to reproduce consistently
Environment:
- SoC: nRF5340
- SDK Version: 3.1.0
- External Flash: MX25L51245G
- Interface: QSPI
- Hardware: Custom board
Code:
const struct device *const cdc_dev = DEVICE_DT_GET_ONE(zephyr_cdc_acm_uart);
uint8_t u8_tempbuf[4096];
int main(void)
{
config_uart();
bq25120_init();
qspi_flash_init();
printf("Hello, nRF5340!\n");
uint32_t addr = 0x00;
uint32_t bytes = 4096;
GD_data_flash_erase(addr, 1);
k_msleep(10);
memset(u8_tempbuf, 0xAA, bytes);
GD_data_flash_write(addr, u8_tempbuf, bytes);
k_msleep(10);
memset(u8_tempbuf, 0x55, bytes);
GD_data_flash_read(addr, u8_tempbuf, bytes);
printf("flash_read:\n");
for (int i = 0; i < 20; i++)
{
printf("%02X ", u8_tempbuf[i]);
}
printf("\n");
while(1);
}
overlay:
overlay:
=======
/ {
chosen {
zephyr,console = &cdc_acm_uart0;
};
};
&pinctrl {
i2c2_default: i2c2_default {
group1 {
psels = <NRF_PSEL(TWIM_SCL, 1, 5)>,
<NRF_PSEL(TWIM_SDA , 1, 6)>;
};
};
i2c2_sleep: i2c2_sleep {
group1 {
psels = <NRF_PSEL(TWIM_SCL, 1, 5)>,
<NRF_PSEL(TWIM_SDA , 1, 6)>;
};
};
qspi_default: qspi_default {
group1 {
psels = <NRF_PSEL(QSPI_SCK, 0, 17)>,
<NRF_PSEL(QSPI_IO0, 0, 13)>,
<NRF_PSEL(QSPI_IO1, 0, 14)>,
<NRF_PSEL(QSPI_IO2, 0, 15)>,
<NRF_PSEL(QSPI_IO3, 0, 16)>,
<NRF_PSEL(QSPI_CSN, 0, 18)>;
};
};
qspi_sleep: qspi_sleep {
group1 {
psels = <NRF_PSEL(QSPI_SCK, 0, 17)>,
<NRF_PSEL(QSPI_IO0, 0, 13)>,
<NRF_PSEL(QSPI_IO1, 0, 14)>,
<NRF_PSEL(QSPI_IO2, 0, 15)>,
<NRF_PSEL(QSPI_IO3, 0, 16)>;
low-power-enable;
};
group2 {
psels = <NRF_PSEL(QSPI_CSN, 0, 18)>;
low-power-enable;
bias-pull-up;
};
};
};
&i2c1 {
status = "okay";
compatible = "nordic,nrf-twim";
clock-frequency = <I2C_BITRATE_STANDARD>;
pinctrl-0 = <&i2c2_default>;
pinctrl-1 = <&i2c2_sleep>;
pinctrl-names = "default", "sleep";
pmic: pmic@6a {
compatible = "i2c-device"; // Specify the compatible string for the codec device
reg = <0x6a>; // Set the I2C address of the codec device
label = "PMIC"; // Assign a label to the codec device
};
};
/{
custom_gpios
{
compatible = "gpio-leds";
PMIC_LSW: pmic_lsw_p025 // node label, node name
{
gpios = <&gpio0 25 GPIO_ACTIVE_HIGH>;
};
PMIC_PG_SW: pmic_pg_p020
{
gpios = <&gpio0 20 GPIO_ACTIVE_HIGH>;
};
PMIC_INT: pmic_int_p104
{
gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>;
};
PMIC_CD: pmic_cd_p109
{
gpios = <&gpio1 9 GPIO_ACTIVE_LOW>;
};
};
aliases
{
pmiclsw = &PMIC_LSW;
pmicpowergood = &PMIC_PG_SW;
pmicint = &PMIC_INT;
pmiccd = &PMIC_CD;
};
};
&qspi {
status = "okay";
pinctrl-0 = <&qspi_default>;
pinctrl-1 = <&qspi_sleep>;
pinctrl-names = "default", "sleep";
mx25l51245g: mx25l51245g@0 {
compatible = "nordic,qspi-nor";
reg = <0>;
sck-frequency = <8000000>;
jedec-id = [ c2 20 1a ];
size = <536870912>; /* 512 Mbit = 64 MByte */
readoc = "read4io";
writeoc = "pp4io";
};
};
&usbd {
status = "okay";
cdc_acm_uart0: cdc_acm_uart0 {
compatible = "zephyr,cdc-acm-uart";
label = "CDC_ACM_0";
};
};
&gpio0 {
status = "okay";
};
&gpio1 {
status = "okay";
};
&gpiote {
status = "okay";
};
&gpiote1 {
status = "okay";
};
prj.conf:
===========
prj.conf:
===========
# USB
CONFIG_USB_DEVICE_STACK=y
CONFIG_USB_DEVICE_PRODUCT="nRF5340 Composite Device"
CONFIG_USB_DEVICE_MANUFACTURER="Nordic"
CONFIG_USB_DEVICE_PID=0x0004
CONFIG_USB_DEVICE_VID=0x1915
CONFIG_SERIAL=y
CONFIG_CONSOLE=y
CONFIG_UART_CONSOLE=y
CONFIG_UART_LINE_CTRL=y
# CDC ACM
CONFIG_USB_CDC_ACM=y
CONFIG_GPIO=y
CONFIG_I2C=y
CONFIG_FLASH=y
CONFIG_LOG=y
CONFIG_FLASH_LOG_LEVEL_DBG=y
Observed debug log:
============================
Connected to COM4 @ 115200 ---
[00:00:00.410,644] [0m<dbg> qspi_nor: configure_chip: RDSR 7e QE 1 need 1: no-change[0m
*** Booting nRF Connect SDK v3.1.0-6c6e5b32496e ***
*** Using Zephyr OS v4.1.99-1612683d4010 ***
Voltage = 14, reg = 0xfc
QSPI Flash initialized successfully
Hello, nRF5340!
Erased sector 1 at address 0x00000000
Successfully erased 1 sectors (4096 bytes) starting from 0x00000000
Flash write success. 4096 bytes written.
flash_read:
FF FF FF FF FF .............
Questions:
- Can this happen due to flash protection/lock state?
- Is there any known QSPI initialization timing issue on nRF5340?
