ports: Allow MICROPY_PY_MACHINE_I2C_TARGET to be disabled by board cfg.

dpgeorge · dpgeorge · commit d5ecda05eb74 · 2025-08-07T10:33:26.000+10:00
Signed-off-by: Damien George &lt;damien@micropython.org&gt;
diff --git a/ports/alif/mpconfigport.h b/ports/alif/mpconfigport.h
@@ -132,10 +132,12 @@
 #define MICROPY_PY_MACHINE_PULSE                (1)
 #define MICROPY_PY_MACHINE_I2C                  (MICROPY_HW_ENABLE_HW_I2C)
 #define MICROPY_PY_MACHINE_I2C_TRANSFER_WRITE1  (1)
+#ifndef MICROPY_PY_MACHINE_I2C_TARGET
 #define MICROPY_PY_MACHINE_I2C_TARGET           (MICROPY_HW_ENABLE_HW_I2C)
 #define MICROPY_PY_MACHINE_I2C_TARGET_INCLUDEFILE "ports/alif/machine_i2c_target.c"
 #define MICROPY_PY_MACHINE_I2C_TARGET_MAX       (4)
 #define MICROPY_PY_MACHINE_I2C_TARGET_HARD_IRQ  (1)
+#endif
 #define MICROPY_PY_MACHINE_SOFTI2C              (1)
 #define MICROPY_PY_MACHINE_SPI                  (1)
 #define MICROPY_PY_MACHINE_SOFTSPI              (1)
diff --git a/ports/esp32/mpconfigport.h b/ports/esp32/mpconfigport.h
@@ -139,11 +139,13 @@
 #define MICROPY_PY_MACHINE_PWM_INCLUDEFILE  "ports/esp32/machine_pwm.c"
 #define MICROPY_PY_MACHINE_I2C              (1)
 #define MICROPY_PY_MACHINE_I2C_TRANSFER_WRITE1 (1)
+#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)
+#endif
 #define MICROPY_PY_MACHINE_SOFTI2C          (1)
 #define MICROPY_PY_MACHINE_SPI              (1)
 #define MICROPY_PY_MACHINE_SOFTSPI          (1)
diff --git a/ports/mimxrt/mpconfigport.h b/ports/mimxrt/mpconfigport.h
@@ -92,11 +92,13 @@ uint32_t trng_random_u32(void);
 #define MICROPY_PY_MACHINE_PWM              (1)
 #define MICROPY_PY_MACHINE_PWM_INCLUDEFILE  "ports/mimxrt/machine_pwm.c"
 #define MICROPY_PY_MACHINE_I2C              (1)
+#ifndef MICROPY_PY_MACHINE_I2C_TARGET
 #define MICROPY_PY_MACHINE_I2C_TARGET       (1)
 #define MICROPY_PY_MACHINE_I2C_TARGET_INCLUDEFILE "ports/mimxrt/machine_i2c_target.c"
 #define MICROPY_PY_MACHINE_I2C_TARGET_MAX   (FSL_FEATURE_SOC_LPI2C_COUNT)
 #define MICROPY_PY_MACHINE_I2C_TARGET_HARD_IRQ (1)
 #define MICROPY_PY_MACHINE_I2C_TARGET_FINALISER (1)
+#endif
 #ifndef MICROPY_PY_MACHINE_I2S
 #define MICROPY_PY_MACHINE_I2S              (0)
 #endif
diff --git a/ports/rp2/mpconfigport.h b/ports/rp2/mpconfigport.h
@@ -171,10 +171,12 @@
 #define MICROPY_PY_MACHINE_PWM                  (1)
 #define MICROPY_PY_MACHINE_PWM_INCLUDEFILE      "ports/rp2/machine_pwm.c"
 #define MICROPY_PY_MACHINE_I2C                  (1)
+#ifndef MICROPY_PY_MACHINE_I2C_TARGET
 #define MICROPY_PY_MACHINE_I2C_TARGET           (1)
 #define MICROPY_PY_MACHINE_I2C_TARGET_INCLUDEFILE "ports/rp2/machine_i2c_target.c"
 #define MICROPY_PY_MACHINE_I2C_TARGET_MAX       (2)
 #define MICROPY_PY_MACHINE_I2C_TARGET_HARD_IRQ  (1)
+#endif
 #define MICROPY_PY_MACHINE_SOFTI2C              (1)
 #define MICROPY_PY_MACHINE_I2S                  (1)
 #define MICROPY_PY_MACHINE_I2S_INCLUDEFILE      "ports/rp2/machine_i2s.c"
diff --git a/ports/stm32/mpconfigboard_common.h b/ports/stm32/mpconfigboard_common.h
@@ -639,11 +639,13 @@
 #if defined(MICROPY_HW_I2C1_SCL) || defined(MICROPY_HW_I2C2_SCL) \
     || defined(MICROPY_HW_I2C3_SCL) || defined(MICROPY_HW_I2C4_SCL)
 #define MICROPY_HW_ENABLE_HW_I2C (1)
+#ifndef MICROPY_HW_ENABLE_HW_I2C_TARGET
 #if defined(STM32F4) || defined(STM32F7) || defined(STM32H7) || defined(STM32WB)
 #define MICROPY_HW_ENABLE_HW_I2C_TARGET (1)
 #else
 #define MICROPY_HW_ENABLE_HW_I2C_TARGET (0)
 #endif
+#endif
 #else
 #define MICROPY_HW_ENABLE_HW_I2C (0)
 #define MICROPY_HW_ENABLE_HW_I2C_TARGET (0)
