rp2/machine_i2c: Factor default pin macros to header file.

So they can be reused by the I2CTarget implementation.

Signed-off-by: Damien George <damien@micropython.org>

2 files changed, 69 insertions, 39 deletions

diff --git a/ports/rp2/machine_i2c.c b/ports/rp2/machine_i2c.c
index 94212fb48..99a94ec2f 100644
--- a/ports/rp2/machine_i2c.c
+++ b/ports/rp2/machine_i2c.c
@@ -28,51 +28,13 @@
 #include "py/mphal.h"
 #include "py/mperrno.h"
 #include "extmod/modmachine.h"
+#include "machine_i2c.h"
 
 #include "hardware/i2c.h"
 
 #define DEFAULT_I2C_FREQ (400000)
 #define DEFAULT_I2C_TIMEOUT (50000)
 
-#ifdef MICROPY_HW_I2C_NO_DEFAULT_PINS
-
-// With no default I2C, need to require the pin args.
-#define MICROPY_HW_I2C0_SCL (0)
-#define MICROPY_HW_I2C0_SDA (0)
-#define MICROPY_HW_I2C1_SCL (0)
-#define MICROPY_HW_I2C1_SDA (0)
-#define MICROPY_I2C_PINS_ARG_OPTS MP_ARG_REQUIRED
-
-#else
-
-// Most boards do not require pin args.
-#define MICROPY_I2C_PINS_ARG_OPTS 0
-
-#ifndef MICROPY_HW_I2C0_SCL
-#if PICO_DEFAULT_I2C == 0
-#define MICROPY_HW_I2C0_SCL (PICO_DEFAULT_I2C_SCL_PIN)
-#define MICROPY_HW_I2C0_SDA (PICO_DEFAULT_I2C_SDA_PIN)
-#else
-#define MICROPY_HW_I2C0_SCL (9)
-#define MICROPY_HW_I2C0_SDA (8)
-#endif
-#endif
-
-#ifndef MICROPY_HW_I2C1_SCL
-#if PICO_DEFAULT_I2C == 1
-#define MICROPY_HW_I2C1_SCL (PICO_DEFAULT_I2C_SCL_PIN)
-#define MICROPY_HW_I2C1_SDA (PICO_DEFAULT_I2C_SDA_PIN)
-#else
-#define MICROPY_HW_I2C1_SCL (7)
-#define MICROPY_HW_I2C1_SDA (6)
-#endif
-#endif
-#endif
-
-// SDA/SCL on even/odd pins, I2C0/I2C1 on even/odd pairs of pins.
-#define IS_VALID_SCL(i2c, pin) (((pin) & 1) == 1 && (((pin) & 2) >> 1) == (i2c))
-#define IS_VALID_SDA(i2c, pin) (((pin) & 1) == 0 && (((pin) & 2) >> 1) == (i2c))
-
 typedef struct _machine_i2c_obj_t {
     mp_obj_base_t base;
     i2c_inst_t *const i2c_inst;
diff --git a/ports/rp2/machine_i2c.h b/ports/rp2/machine_i2c.h
new file mode 100644
index 000000000..da8cb5f85
--- /dev/null
+++ b/ports/rp2/machine_i2c.h
@@ -0,0 +1,68 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020-2025 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef MICROPY_INCLUDED_RP2_MACHINE_I2C_H
+#define MICROPY_INCLUDED_RP2_MACHINE_I2C_H
+
+#ifdef MICROPY_HW_I2C_NO_DEFAULT_PINS
+
+// With no default I2C, need to require the pin args.
+#define MICROPY_HW_I2C0_SCL (0)
+#define MICROPY_HW_I2C0_SDA (0)
+#define MICROPY_HW_I2C1_SCL (0)
+#define MICROPY_HW_I2C1_SDA (0)
+#define MICROPY_I2C_PINS_ARG_OPTS MP_ARG_REQUIRED
+
+#else
+
+// Most boards do not require pin args.
+#define MICROPY_I2C_PINS_ARG_OPTS 0
+
+#ifndef MICROPY_HW_I2C0_SCL
+#if PICO_DEFAULT_I2C == 0
+#define MICROPY_HW_I2C0_SCL (PICO_DEFAULT_I2C_SCL_PIN)
+#define MICROPY_HW_I2C0_SDA (PICO_DEFAULT_I2C_SDA_PIN)
+#else
+#define MICROPY_HW_I2C0_SCL (9)
+#define MICROPY_HW_I2C0_SDA (8)
+#endif
+#endif
+
+#ifndef MICROPY_HW_I2C1_SCL
+#if PICO_DEFAULT_I2C == 1
+#define MICROPY_HW_I2C1_SCL (PICO_DEFAULT_I2C_SCL_PIN)
+#define MICROPY_HW_I2C1_SDA (PICO_DEFAULT_I2C_SDA_PIN)
+#else
+#define MICROPY_HW_I2C1_SCL (7)
+#define MICROPY_HW_I2C1_SDA (6)
+#endif
+#endif
+#endif
+
+// SDA/SCL on even/odd pins, I2C0/I2C1 on even/odd pairs of pins.
+#define IS_VALID_SCL(i2c, pin) (((pin) & 1) == 1 && (((pin) & 2) >> 1) == (i2c))
+#define IS_VALID_SDA(i2c, pin) (((pin) & 1) == 0 && (((pin) & 2) >> 1) == (i2c))
+
+#endif // MICROPY_INCLUDED_RP2_MACHINE_I2C_H