How to reduce IRAM usage

[gunar.kroeger]

I tried to move to stable version of idf v3.2, but my code would not fit in IRAM anymore,

so I returned to the master branch, commit [a8754cc], I was working on and checked usage with command make size-components:

Code: Select all

Python requirements from C:/msys32/home/gunar.kroeger/esp/esp-idf/requirements.txt are satisfied.

Total sizes:

 DRAM .data size:   15828 bytes

 DRAM .bss  size:   82184 bytes

Used static DRAM:   98012 bytes (  26568 available, 78.7% used)

Used static IRAM:  127880 bytes (   3192 available, 97.6% used)

      Flash code: 1140241 bytes

    Flash rodata:  272148 bytes

Total image size:~1556097 bytes (.bin may be padded larger)

Per-archive contributions to ELF file:

            Archive File DRAM .data & .bss   IRAM Flash code & rodata   Total

                 libbt.a        195  43448   1512     304343    82618  432116

           libnet80211.a        321   9213   3577     112174    14045  139330

            libmbedtls.a         92    264      0     109091    21354  130801

               liblwip.a         19   4172      0     100100    16939  121230

 libc-psram-workaround.a       1804     62  15946      85626     6349  109787

              libesp32.a       3153   2642  19873      27292    30237   83197

             libdriver.a        119    183   4031      43679    31417   79429

                 libpp.a       1229   5286  13407      45710     4208   69840

               libmain.a        142   9637      0      40341    16971   67091

           libbtdm_app.a        255   2203  19607      40838     3617   66520

                libphy.a       1284    915   5710      29799        0   37708

             libspiffs.a          0     12      0      24450     1407   25869

                libwpa.a          0    682      0      21016     2312   24010

              libminiz.a          0      0      0      18407     5113   23520

           libfreertos.a       4156    776  15958          0     2166   23056

              libfatfs.a          4     47      0      19995     2184   22230

             libnghttp.a          0      0      0      15226     4141   19367

          libnvs_flash.a          0     32      0      13382     3261   16675

     libwpa_supplicant.a          0      0      0      13524     2318   15842

                libsoc.a        245      4   8139        727     4145   13260

              libsdmmc.a          0      0      0       9190     3687   12877

          libspi_flash.a         36    323   7036       1561     1791   10747

    libesp_http_client.a          0      0      0       7113     2047    9160

                libvfs.a        240    103      0       8245      559    9147

 libm-psram-workaround.a          4      0      0       6994      541    7539

               libheap.a        884      8   3867       1546      920    7225

            libcoexist.a       1365    106   3704       1523        0    6698

                libgcc.a          4     20    104       5564      888    6580

        libesp_ringbuf.a          0      0      0       4643      594    5237

             libstdc++.a          8     20      0       2689     1253    3970

 libbootloader_support.a          0      4      0       2585     1268    3857

      libtcpip_adapter.a          0    124      0       3094      353    3571

      libtcp_transport.a          0      0      0       2513      610    3123

         libapp_update.a          0     80      0       2136      725    2941

             libnewlib.a        152    272    830       1155      167    2576

            libesp-tls.a          0      0      0       1735      770    2505

                librtc.a          0      4   2304          0        0    2308

        libesp_adc_cal.a          0      0      0       1014      674    1688

            libpthread.a         16     12    178        874      607    1687

                liblog.a          8    268    478        810       98    1662

         libsd_logging.a          0   1028      0        279       73    1380

               libcore.a          0      5      0        821      415    1241

    libsmartconfig_ack.a          0      1      0        766      257    1024

                libhal.a          0      0    515          0       32     547

                libcxx.a          0      0      0         11        0      11

libxtensa-debug-module.a          0      0      8          0        0       8

               libwpa2.a          0      1      0          0        0       1

                libwps.a          0      1      0          0        0       1

           libethernet.a          0      0      0          0        0       0

               libmesh.a          0      0      0          0        0       0

And it shows that IRAM region is almost full already!
Can you see anything out of the ordinary from this info? Is there a way to reduce IRAM usage? I'm using the WROVER module

[fly135]

Are you using Bluetooth? If not then you can free up some internal memory that may help.

Code: Select all

esp_bt_controller_mem_release(ESP_BT_MODE_BTDM);

John A

[gunar.kroeger]

Yes, I am using SPP to transfer files and did the release memory for BLE, but eventually I will also need the BLE feature.
I'm also using WiFi with Https client.

I already changed from debug to release mode to gain a bit of memory and to allow me to use the v3.2 release with 93% of memory used, but that is not a final solution, I fear.