MicroPython
Which model of ESP32 support I2C Target? #17981
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#ifndef MICROPY_PY_MACHINE_I2C_TARGET
// I2C target hardware is limited on ESP32 (eg read event comes after the read) so we only support newer SoCs.
// ESP32C6 does not have enough flash space so also disable it on that SoC.
#define MICROPY_PY_MACHINE_I2C_TARGET (SOC_I2C_SUPPORT_SLAVE && !CONFIG_IDF_TARGET_ESP32 && !CONFIG_IDF_TARGET_ESP32C6)
#define MICROPY_PY_MACHINE_I2C_TARGET_INCLUDEFILE "ports/esp32/machine_i2c_target.c"
#define MICROPY_PY_MACHINE_I2C_TARGET_MAX (2)How to know which model of ESP32 support I2C Target? |
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The way I understand |
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Just to expand on @Lobo-T's correct response; the OG ESP32's I2C hardware support is poor for Target devices so it's been disabled. However, the ESP32-C6 can certainly support I2CTarget but that device is currently very low on flash; adding it (or I2S, disabled for the same reason) overflows the available flash. It's likely there will be a change at some point to the C6 builds to add more space to the firmware partition and less to the filesystem. |
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...an update: The ESP32-C6 now has I2CTarget support. 🎉 Compiler options were changed on some boards to optimise for size; for the C6 this meant a saving of 211KB (!) and so it meant there was room to enable I2CTarget (and I2S). See links below: |
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Just to expand on @Lobo-T's correct response; the OG ESP32's I2C hardware support is poor for Target devices so it's been disabled.
However, the ESP32-C6 can certainly support I2CTarget but that device is currently very low on flash; adding it (or I2S, disabled for the same reason) overflows the available flash. It's likely there will be a change at some point to the C6 builds to add more space to the firmware partition and less to the filesystem.