ptr_demo.c

C指针与内存操作

  name="google_ads_frame" marginwidth="0" marginheight="0" src="http://pagead2.googlesyndication.com/pagead/ads?client=ca-pub-5572165936844014&dt=1194442938015&lmt=1194190197&format=336x280_as&output=html&correlator=1194442937843&url=file%3A%2F%2F%2FC%3A%2FDocuments%2520and%2520Settings%2Flhh1%2F%E6%A1%8C%E9%9D%A2%2FCLanguage.htm&color_bg=FFFFFF&color_text=000000&color_link=000000&color_url=FFFFFF&color_border=FFFFFF&ad_type=text&ga_vid=583001034.1194442938&ga_sid=1194442938&ga_hid=1942779085&flash=9&u_h=768&u_w=1024&u_ah=740&u_aw=1024&u_cd=32&u_tz=480&u_java=true" frameborder="0" width="336" scrolling="no" height="280" allowtransparency="allowtransparency"> #include <stdio.h>

void main(void)
 {
   int counter = 10;
   int *iptr;          // Declare pointer value

   iptr = &counter;    // Assign the address
   printf("Addres in iptr %x Value at *iptr %d/n", iptr, *iptr);
  
   *iptr = 25;         // Change the value in memory

   printf("Value of counter %d/n", counter);
 }

 

Rebuild started: Project: Project *** Using Compiler 'V6.19', folder: 'C:\Keil_v5\ARM\ARMCLANG\Bin' Rebuild target 'Project' compiling app_ble.c... ../Src/main.c(200): warning: null passed to a callee that requires a non-null argument [-Wnonnull] fputc('s', NULL); ~~~~^ ../Src/main.c(339): warning: null passed to a callee that requires a non-null argument [-Wnonnull] fputc('w', NULL); ~~~~^ 2 warnings generated. compiling main.c... ../Src/app_at.c(793): warning: passing 'char *' to parameter of type 'uint8_t *' (aka 'unsigned char *') converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign] tcp_rec_show_update((char *)p->payload,p->len); ^~~~~~~~~~~~~~~~~~ ../Src/app_at.c(792): note: passing argument to parameter 'data' here extern void tcp_rec_show_update(uint8_t *data,uint32_t len); ^ 1 warning generated. compiling app_at.c... ../Src/app_bt.c(662): warning: format specifies type 'char *' but the argument has type 'void *' [-Wformat] printf("hfg codec connection rsp: %s,type = %d\r\n",Info->p.ptr,codec_type); ~~ ^~~~~~~~~~~ 1 warning generated. compiling app_bt.c... compiling app_btdm.c... compiling app_task.c... compiling app_hw.c... compiling diskio.c... compiling app_lvgl.c... compiling user_bt.c... compiling autonavi_profile.c... compiling autonavi_handler.c... compiling app_rpmsg.c... compiling msbc_sample.c... compiling app_hid_sdp.c... compiling app_audio.c... compiling sbc_sample.c... compiling mp3_sample.c... compiling btdm_mem.c... compiling controller.c... assembling controller_code.s... compiling host.c... compiling SWD.c... assembling img_rom.s... compiling fal_flash_port.c... compiling fdb_app.c... assembling startup_fr30xx.s... compiling driver_cali.c... compiling trim_fr30xx.c... compiling system_fr30xx.c... compiling driver_efuse.c... compiling driver_frspim.c... compiling driver_flash.c... compiling driver_gpio.c... compiling driver_pmu.c... compiling driver_pmu_iwdt.c... compiling driver_qspi.c... compiling driver_trng.c... compiling driver_uart.c... compiling driver_timer.c... compiling driver_dma.c... compiling driver_display.c... compiling driver_spi_master.c... compiling driver_sd_card.c... compiling driver_sd.c... compiling driver_ipc.c... compiling driver_can.c... compiling driver_pdm.c... compiling driver_i2s.c... compiling driver_psd_dac.c... compiling driver_display_dev.c... compiling driver_saradc.c... compiling ext_flash.c... compiling driver_st7282_rgb_hw.c... compiling co_log.c... ../../../../components/drivers/bsp/spi_flash/IC_W25Qxx.c(240): warning: incompatible pointer types passing 'uint16_t *' (aka 'unsigned short *') to parameter of type 'uint8_t *' (aka 'unsigned char *') [-Wincompatible-pointer-types] __SPI_Read_flash_X1(lu8_DataBuffer, 4, pu8_Buffer, fu32_Length); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ../../../../components/drivers/bsp/spi_flash/IC_W25Qxx.h(37): note: expanded from macro '__SPI_Read_flash_X1' #define __SPI_Read_flash_X1(__CMD__, __CSIZE__, __BUFFER__, __SIZE__) spi_master_readflash_X1(&spi_flash_handle, (uint16_t *)__CMD__, __CSIZE__, (void *)__BUFFER__, __SIZE__) ^~~~~~~~~~~~~~~~~~~ ../../../../components/drivers/peripheral/Inc/driver_spi.h(522): note: passing argument to parameter 'fp_CMD_ADDR' here void spi_master_readflash_X1(SPI_HandleTypeDef *hspi, uint8_t *fp_CMD_ADDR, uint32_t fu32_CMDLegnth, uint8_t *fp_Data, uint16_t fu16_Size); ^ 1 warning generated. compiling IC_W25Qxx.c... compiling co_list.c... compiling fal.c... compiling co_util.c... compiling fal_flash.c... compiling fdb.c... compiling fal_partition.c... compiling croutine.c... compiling fdb_utils.c... compiling event_groups.c... compiling list.c... compiling fdb_kvdb.c... compiling stream_buffer.c... compiling queue.c... compiling port.c... compiling timers.c... compiling portasm.c... compiling heap_6.c... assembling cpu_context.s... compiling freertos_sleep.c... compiling tasks.c... compiling heap.c... compiling lv_indev.c... compiling lv_refr.c... compiling lv_obj_pos.c... compiling lv_flex.c... compiling lv_bmp.c... compiling lv_ffmpeg.c... compiling lv_grid.c... compiling lv_freetype.c... compiling lv_fs_posix.c... compiling lv_fs_fatfs.c... compiling lv_fs_stdio.c... compiling lv_fs_win32.c... compiling lv_gif.c... compiling gifdec.c... compiling lodepng.c... compiling lv_png.c... compiling lv_qrcode.c... compiling lv_rlottie.c... compiling lv_sjpg.c... compiling tjpgd.c... compiling lv_fragment.c... compiling lv_fragment_manager.c... compiling lv_gridnav.c... compiling qrcodegen.c... compiling lv_ime_pinyin.c... compiling lv_imgfont.c... compiling lv_msg.c... compiling lv_monkey.c... compiling lv_snapshot.c... compiling lv_theme_basic.c... compiling lv_theme_mono.c... compiling lv_animimg.c... compiling lv_theme_default.c... compiling lv_calendar.c... compiling lv_calendar_header_dropdown.c... compiling lv_calendar_header_arrow.c... compiling lv_imgbtn.c... compiling lv_colorwheel.c... compiling lv_keyboard.c... compiling lv_chart.c... compiling lv_led.c... compiling lv_list.c... compiling lv_menu.c... compiling lv_msgbox.c... compiling lv_meter.c... compiling lv_spinner.c... compiling lv_spinbox.c... compiling lv_span.c... compiling lv_tileview.c... compiling lv_tabview.c... compiling lv_win.c... compiling lv_font.c... compiling lv_extra.c... compiling lv_font_dejavu_16_persian_hebrew.c... compiling lv_font_fmt_txt.c... compiling lv_font_montserrat_8.c... compiling lv_font_loader.c... compiling lv_font_montserrat_10.c... compiling lv_font_montserrat_12.c... compiling lv_font_montserrat_12_subpx.c... compiling lv_font_montserrat_14.c... compiling lv_font_montserrat_18.c... compiling lv_font_montserrat_16.c... compiling lv_font_montserrat_20.c... compiling lv_font_montserrat_22.c... compiling lv_font_montserrat_24.c... compiling lv_font_montserrat_26.c... compiling lv_font_montserrat_28_compressed.c... compiling lv_font_montserrat_28.c... compiling lv_font_montserrat_30.c... compiling lv_font_montserrat_32.c... compiling lv_font_montserrat_34.c... compiling lv_font_montserrat_36.c... compiling lv_font_montserrat_38.c... compiling lv_font_montserrat_40.c... compiling lv_font_montserrat_42.c... compiling lv_font_montserrat_44.c... compiling lv_font_montserrat_46.c... compiling lv_font_montserrat_48.c... compiling lv_font_simsun_16_cjk.c... compiling lv_font_unscii_8.c... compiling lv_font_unscii_16.c... compiling lv_hal_tick.c... compiling lv_hal_indev.c... compiling lv_hal_disp.c... compiling lv_anim.c... compiling lv_anim_timeline.c... compiling lv_area.c... compiling lv_async.c... compiling lv_color.c... compiling lv_fs.c... compiling lv_bidi.c... compiling lv_gc.c... compiling lv_log.c... compiling lv_ll.c... compiling lv_math.c... compiling lv_lru.c... compiling lv_printf.c... compiling lv_mem.c... compiling lv_templ.c... compiling lv_style.c... compiling lv_style_gen.c... compiling lv_tlsf.c... compiling lv_timer.c... compiling lv_utils.c... compiling lv_txt.c... compiling lv_txt_ap.c... compiling lv_btn.c... compiling lv_arc.c... compiling lv_bar.c... compiling lv_checkbox.c... compiling lv_canvas.c... compiling lv_btnmatrix.c... compiling lv_img.c... compiling lv_dropdown.c... compiling lv_objx_templ.c... compiling lv_label.c... compiling lv_line.c... compiling lv_roller.c... compiling lv_slider.c... compiling lv_switch.c... compiling lv_textarea.c... compiling lv_table.c... compiling lv_demo_benchmark.c... compiling img_benchmark_cogwheel_alpha16.c... compiling img_benchmark_cogwheel_argb.c... compiling img_benchmark_cogwheel_chroma_keyed.c... compiling img_benchmark_cogwheel_indexed16.c... compiling img_benchmark_cogwheel_rgb.c... compiling img_benchmark_cogwheel_rgb565a8.c... compiling lv_font_bechmark_montserrat_12_compr_az.c.c... compiling lv_font_bechmark_montserrat_16_compr_az.c.c... compiling lv_font_bechmark_montserrat_28_compr_az.c.c... compiling lv_demo_stress.c... compiling img_clothes.c... compiling lv_demo_widgets.c... compiling img_demo_widgets_avatar.c... compiling img_lvgl_logo.c... compiling lv_demo_music.c... compiling lv_demo_music_list.c... compiling img_lv_demo_music_btn_corner_large.c... compiling lv_demo_music_main.c... compiling img_lv_demo_music_btn_list_pause.c... compiling img_lv_demo_music_btn_list_pause_large.c... compiling img_lv_demo_music_btn_list_play.c... compiling img_lv_demo_music_btn_list_play_large.c... compiling img_lv_demo_music_btn_loop.c... compiling img_lv_demo_music_btn_loop_large.c... compiling img_lv_demo_music_btn_next.c... compiling img_lv_demo_music_btn_next_large.c... compiling img_lv_demo_music_btn_pause.c... compiling img_lv_demo_music_btn_pause_large.c... compiling img_lv_demo_music_btn_play.c... compiling img_lv_demo_music_btn_play_large.c... compiling img_lv_demo_music_btn_prev.c... compiling img_lv_demo_music_btn_prev_large.c... compiling img_lv_demo_music_btn_rnd.c... compiling img_lv_demo_music_btn_rnd_large.c... compiling img_lv_demo_music_corner_left.c... compiling img_lv_demo_music_corner_left_large.c... compiling img_lv_demo_music_corner_right.c... compiling img_lv_demo_music_corner_right_large.c... compiling img_lv_demo_music_cover_1_large.c... compiling img_lv_demo_music_cover_1.c... compiling img_lv_demo_music_cover_2.c... compiling img_lv_demo_music_cover_2_large.c... compiling img_lv_demo_music_cover_3.c... compiling img_lv_demo_music_cover_3_large.c... compiling img_lv_demo_music_icon_1.c... compiling img_lv_demo_music_icon_1_large.c... compiling img_lv_demo_music_icon_2.c... compiling img_lv_demo_music_icon_2_large.c... compiling img_lv_demo_music_icon_3.c... compiling img_lv_demo_music_icon_3_large.c... compiling img_lv_demo_music_icon_4.c... compiling img_lv_demo_music_icon_4_large.c... compiling img_lv_demo_music_list_border.c... compiling img_lv_demo_music_list_border_large.c... compiling img_lv_demo_music_logo.c... compiling img_lv_demo_music_slider_knob.c... compiling img_lv_demo_music_slider_knob_large.c... compiling img_lv_demo_music_wave_bottom.c... compiling img_lv_demo_music_wave_bottom_large.c... compiling img_lv_demo_music_wave_top.c... compiling crc32.c... compiling ffsystem.c... compiling img_lv_demo_music_wave_top_large.c... compiling ffunicode.c... compiling lfs_util.c... compiling ext_flash_program.c... compiling ff.c... compiling ext_flash_uart.c... compiling lfs_port.c... compiling lv_common_function.c... compiling batt_full_yellow.c... compiling lfs.c... compiling batt_full_gren.c... compiling arialuni_bbp1_32px__.c... compiling Number_HarmonyOS_bpp4_16px.c... compiling Number_HarmonyOS_bpp4_12px.c... compiling Number_HarmonyOS_bpp4_44px.c... compiling Number_HarmonyOS_bpp4_36px.c... compiling Number_HarmonyOS_bpp4_92px.c... compiling fr_lv_test_page.c... compiling Number_HarmonyOS_bpp4_20px.c... compiling fr_lv_86box_page.c... compiling fr_lv_customer_page.c... compiling fr_lv_app_music_control.c... compiling fr_lv_instrument_panel.c... compiling fr_lv_instrument_panel_km.c... compiling fr_lv_list_page.c... compiling fr_lv_can_page.c... compiling fr_lv_bt_pan_page.c... compiling fr_guimain.c... compiling fr_watch.c... compiling lv_user_sqlist.c... compiling fr_device_rtc.c... compiling fr_device_button.c... compiling fr_device_encode.c... compiling fr_device_pmu_io.c... compiling autoip.c... compiling fr_device_canfd.c... compiling icmp.c... compiling etharp.c... compiling igmp.c... compiling dhcp.c... compiling ip4.c... compiling ip4_addr.c... compiling dhcp6.c... compiling ethip6.c... compiling ip4_frag.c... compiling icmp6.c... compiling inet6.c... compiling ip6.c... compiling ip6_addr.c... compiling ip6_frag.c... compiling mld6.c... compiling nd6.c... compiling altcp.c... compiling altcp_alloc.c... compiling altcp_tcp.c... compiling def.c... compiling inet_chksum.c... compiling init.c... compiling dns.c... compiling ip.c... compiling mem.c... compiling memp.c... compiling raw.c... compiling netif.c... compiling stats.c... compiling sys.c... compiling pbuf.c... compiling tcp_in.c... compiling tcp.c... compiling tcp_out.c... compiling timeouts.c... compiling udp.c... compiling api_lib.c... compiling err.c... compiling if_api.c... compiling api_msg.c... compiling netbuf.c... compiling netdb.c... compiling netifapi.c... compiling ethernet.c... compiling tcpip.c... compiling ethernetif.c... compiling sys_arch.c... compiling sockets.c... compiling rpmsg.c... compiling rpmsg_ns.c... compiling rpmsg_lite.c... compiling rpmsg_queue.c... compiling llist.c... compiling virtqueue.c... compiling rpmsg_env_freertos.c... compiling rpmsg_platform.c... assembling dsp_code_rom.s... compiling dsp.c... compiling dsp_mem.c... compiling audio_a2dp_sink.c... compiling audio_a2dp_source.c... compiling audio_encoder.c... compiling audio_rpmsg.c... ../../../../components/modules/audio/audio_decoder.c(72): warning: null passed to a callee that requires a non-null argument [-Wnonnull] fputc(hex2char[(value >> 12)&0xf], NULL); ~~~~^ ../../../../components/modules/audio/audio_decoder.c(73): warning: null passed to a callee that requires a non-null argument [-Wnonnull] fputc(hex2char[(value >> 8)&0xf], NULL); ~~~~^ ../../../../components/modules/audio/audio_decoder.c(74): warning: null passed to a callee that requires a non-null argument [-Wnonnull] fputc(hex2char[(value >> 4)&0xf], NULL); ~~~~^ ../../../../components/modules/audio/audio_decoder.c(75): warning: null passed to a callee that requires a non-null argument [-Wnonnull] fputc(hex2char[(value >> 0)&0xf], NULL); ~~~~^ 4 warnings generated. compiling audio_decoder.c... compiling audio_hw.c... compiling audio_scene.c... compiling local_playback.c... compiling audio_sco.c... compiling loopback.c... compiling recorder.c... compiling voice_recognize.c... compiling algorithm.c... compiling resample.c... compiling codec.c... compiling AMS_client.c... compiling simple_gatt_service.c... compiling ANCS_AMS_client.c... compiling hid_service.c... compiling retarget_io.c... linking... .\Objects\Project.axf: Error: L6985E: Unable to automatically place AT section rpmsg.o(.ARM.__at_0x20000000) with required base address 0x20000000. Please manually place in the scatter file using the --no_autoat option. Not enough information to list image symbols. Finished: 1 information, 0 warning and 1 error messages. ".\Objects\Project.axf" - 1 Error(s), 9 Warning(s). Target not created. Build Time Elapsed: 00:01:10
最新发布
09-13
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