GENMASK and FIELD_PREP macro can't get correct bits value of register

[snowuyl]

I use GENMASK and FIELD_PREP macro to get bits value of register. But it failed to get correct bits value.

#define LP5861_DEV_INITIAL_RESERVED_MSK      GENMASK(7, 3)
#define LP5861_DEV_INITIAL_RESERVED(x)       FIELD_PREP(LP5861_DEV_INITIAL_RESERVED_MSK, x)
#define LP5861_DEV_INITIAL_DATA_REF_MODE_MSK GENMASK(2, 1)
#define LP5861_DEV_INITIAL_DATA_REF_MODE(x)  FIELD_PREP(LP5861_DEV_INITIAL_DATA_REF_MODE_MSK, x)
#define LP5861_DEV_INITIAL_PWM_FRE_MSK       BIT(0)
#define LP5861_DEV_INITIAL_PWM_FRE(x)        FIELD_PREP(LP5861_DEV_INITIAL_PWM_FRE_MSK, x)
const uint8_t u8=0x5e;
devInit.reserved    = LP5861_DEV_INITIAL_RESERVED(u8);
devInit.dataRefMode = LP5861_DEV_INITIAL_DATA_REF_MODE(u8);
devInit.pwmFre      = LP5861_DEV_INITIAL_PWM_FRE(u8);

u8=0x5e
devInit.reserved=0xF0, devInit.dataRefMode=0x4, devInit.pwmFre=0x0

[Karl Ylvisaker]

Hello,

What is the code you are referencing here?
Please elaborate thoroughly on your issue.

Best regards,
Karl

[snowuyl]

Thanks for your reply! Do you think it is helpful if I share whole project source code about this issue?

[snowuyl]

Thanks for your reply! These two macros are defined in C:\ncs\v2.4.2\zephyr\include\zephyr\sys\util.h file.

#define GENMASK(h, l) (((~0UL) - (1UL << (l)) + 1) & (~0UL >> (BITS_PER_LONG - 1 - (h))))
#define LSB_GET(value) ((value) & -(value))
#define FIELD_PREP(mask, value) (((value) * LSB_GET(mask)) & (mask))

[snowuyl]

util.h

[Karl Ylvisaker]

Hello,

Please raise this question in the Zephyr support discord instead, since this is code governed by them.

Best regards,
Karl

[snowuyl]

Thanks for your reply!

[snowuyl]

github.com/.../62917