esp-open-sdk/user_rf_cal_sector_set.c

#include <c_types.h>
#include <spi_flash.h>

uint32 user_rf_cal_sector_set(void) {
    extern char flashchip;
    SpiFlashChip *flash = (SpiFlashChip*)(&flashchip + 4);
    // We know that sector size in 4096
    //uint32_t sec_num = flash->chip_size / flash->sector_size;
    uint32_t sec_num = flash->chip_size >> 12;
    return sec_num - 5;
}