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-rw-r--r--[-rwxr-xr-x]ports/atmel-samd/Makefile2
-rw-r--r--ports/atmel-samd/boards/feather_m0_express/mpconfigboard.h2
-rw-r--r--ports/atmel-samd/boards/feather_m4_express/mpconfigboard.h2
-rw-r--r--ports/atmel-samd/boards/metro_m0_express/mpconfigboard.h2
-rw-r--r--ports/atmel-samd/boards/metro_m4_express/mpconfigboard.h2
-rw-r--r--ports/atmel-samd/common-hal/i2cslave/I2CSlave.c252
-rw-r--r--ports/atmel-samd/common-hal/i2cslave/I2CSlave.h45
-rw-r--r--ports/atmel-samd/common-hal/i2cslave/__init__.c1
-rw-r--r--ports/atmel-samd/mpconfigport.h8
-rw-r--r--shared-bindings/index.rst1
10 files changed, 317 insertions, 0 deletions
diff --git a/ports/atmel-samd/Makefile b/ports/atmel-samd/Makefile
index 20f3ea46c..e1634a1b9 100755..100644
--- a/ports/atmel-samd/Makefile
+++ b/ports/atmel-samd/Makefile
@@ -308,6 +308,8 @@ SRC_COMMON_HAL = \
busio/UART.c \
digitalio/__init__.c \
digitalio/DigitalInOut.c \
+ i2cslave/__init__.c \
+ i2cslave/I2CSlave.c \
microcontroller/__init__.c \
microcontroller/Pin.c \
microcontroller/Processor.c \
diff --git a/ports/atmel-samd/boards/feather_m0_express/mpconfigboard.h b/ports/atmel-samd/boards/feather_m0_express/mpconfigboard.h
index 108d67d9f..03d0ba9bd 100644
--- a/ports/atmel-samd/boards/feather_m0_express/mpconfigboard.h
+++ b/ports/atmel-samd/boards/feather_m0_express/mpconfigboard.h
@@ -62,3 +62,5 @@
// USB is always used internally so skip the pin objects for it.
#define IGNORE_PIN_PA24 1
#define IGNORE_PIN_PA25 1
+
+#define CIRCUITPY_I2CSLAVE
diff --git a/ports/atmel-samd/boards/feather_m4_express/mpconfigboard.h b/ports/atmel-samd/boards/feather_m4_express/mpconfigboard.h
index c82395baf..e9e921b4d 100644
--- a/ports/atmel-samd/boards/feather_m4_express/mpconfigboard.h
+++ b/ports/atmel-samd/boards/feather_m4_express/mpconfigboard.h
@@ -47,3 +47,5 @@
// USB is always used internally so skip the pin objects for it.
#define IGNORE_PIN_PA24 1
#define IGNORE_PIN_PA25 1
+
+#define CIRCUITPY_I2CSLAVE
diff --git a/ports/atmel-samd/boards/metro_m0_express/mpconfigboard.h b/ports/atmel-samd/boards/metro_m0_express/mpconfigboard.h
index 135d6ae92..40ef3ce78 100644
--- a/ports/atmel-samd/boards/metro_m0_express/mpconfigboard.h
+++ b/ports/atmel-samd/boards/metro_m0_express/mpconfigboard.h
@@ -63,3 +63,5 @@
// USB is always used internally so skip the pin objects for it.
#define IGNORE_PIN_PA24 1
#define IGNORE_PIN_PA25 1
+
+#define CIRCUITPY_I2CSLAVE
diff --git a/ports/atmel-samd/boards/metro_m4_express/mpconfigboard.h b/ports/atmel-samd/boards/metro_m4_express/mpconfigboard.h
index 050f678dd..f1201c8a0 100644
--- a/ports/atmel-samd/boards/metro_m4_express/mpconfigboard.h
+++ b/ports/atmel-samd/boards/metro_m4_express/mpconfigboard.h
@@ -48,3 +48,5 @@
// USB is always used internally so skip the pin objects for it.
#define IGNORE_PIN_PA24 1
#define IGNORE_PIN_PA25 1
+
+#define CIRCUITPY_I2CSLAVE
diff --git a/ports/atmel-samd/common-hal/i2cslave/I2CSlave.c b/ports/atmel-samd/common-hal/i2cslave/I2CSlave.c
new file mode 100644
index 000000000..0e68453df
--- /dev/null
+++ b/ports/atmel-samd/common-hal/i2cslave/I2CSlave.c
@@ -0,0 +1,252 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Noralf Trønnes
+ *
+ * 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.
+ */
+
+#include "shared-bindings/i2cslave/I2CSlave.h"
+#include "common-hal/busio/I2C.h"
+
+#include "lib/utils/interrupt_char.h"
+#include "py/mperrno.h"
+#include "py/mphal.h"
+#include "py/runtime.h"
+
+#include "hal/include/hal_gpio.h"
+#include "peripherals/samd/sercom.h"
+
+void common_hal_i2cslave_i2c_slave_construct(i2cslave_i2c_slave_obj_t *self,
+ const mcu_pin_obj_t *scl, const mcu_pin_obj_t *sda,
+ uint8_t *addresses, unsigned int num_addresses, bool smbus) {
+ uint8_t sercom_index;
+ uint32_t sda_pinmux, scl_pinmux;
+ Sercom *sercom = samd_i2c_get_sercom(scl, sda, &sercom_index, &sda_pinmux, &scl_pinmux);
+ if (sercom == NULL) {
+ mp_raise_ValueError("Invalid pins");
+ }
+ self->sercom = sercom;
+
+ gpio_set_pin_function(sda->number, GPIO_PIN_FUNCTION_OFF);
+ gpio_set_pin_function(scl->number, GPIO_PIN_FUNCTION_OFF);
+ gpio_set_pin_function(sda->number, sda_pinmux);
+ gpio_set_pin_function(scl->number, scl_pinmux);
+
+ self->sda_pin = sda->number;
+ self->scl_pin = scl->number;
+ claim_pin(sda);
+ claim_pin(scl);
+
+ samd_peripherals_sercom_clock_init(sercom, sercom_index);
+
+ sercom->I2CS.CTRLA.bit.SWRST = 1;
+ while (sercom->I2CS.CTRLA.bit.SWRST || sercom->I2CS.SYNCBUSY.bit.SWRST) {}
+
+ sercom->I2CS.CTRLB.bit.AACKEN = 0; // Automatic acknowledge is disabled.
+
+ if (num_addresses == 1) {
+ sercom->I2CS.CTRLB.bit.AMODE = 0x0; // MASK
+ sercom->I2CS.ADDR.bit.ADDR = addresses[0];
+ sercom->I2CS.ADDR.bit.ADDRMASK = 0x00; // Match exact address
+ } else if (num_addresses == 2) {
+ sercom->I2CS.CTRLB.bit.AMODE = 0x1; // 2_ADDRS
+ sercom->I2CS.ADDR.bit.ADDR = addresses[0];
+ sercom->I2CS.ADDR.bit.ADDRMASK = addresses[1];
+ } else {
+ uint32_t combined = 0; // all addresses OR'ed
+ uint32_t differ = 0; // bits that differ between addresses
+ for (unsigned int i = 0; i < num_addresses; i++) {
+ combined |= addresses[i];
+ differ |= addresses[0] ^ addresses[i];
+ }
+ sercom->I2CS.CTRLB.bit.AMODE = 0x0; // MASK
+ sercom->I2CS.ADDR.bit.ADDR = combined;
+ sercom->I2CS.ADDR.bit.ADDRMASK = differ;
+ }
+ self->addresses = addresses;
+ self->num_addresses = num_addresses;
+
+ if (smbus) {
+ sercom->I2CS.CTRLA.bit.LOWTOUTEN = 1; // Errata 12003
+ sercom->I2CS.CTRLA.bit.SEXTTOEN = 1; // Slave SCL Low Extend/Cumulative Time-Out 25ms
+ }
+ sercom->I2CS.CTRLA.bit.SCLSM = 0; // Clock stretch before ack
+ sercom->I2CS.CTRLA.bit.MODE = 0x04; // Slave mode
+ sercom->I2CS.CTRLA.bit.ENABLE = 1;
+}
+
+bool common_hal_i2cslave_i2c_slave_deinited(i2cslave_i2c_slave_obj_t *self) {
+ return self->sda_pin == NO_PIN;
+}
+
+void common_hal_i2cslave_i2c_slave_deinit(i2cslave_i2c_slave_obj_t *self) {
+ if (common_hal_i2cslave_i2c_slave_deinited(self)) {
+ return;
+ }
+
+ self->sercom->I2CS.CTRLA.bit.ENABLE = 0;
+
+ reset_pin(self->sda_pin);
+ reset_pin(self->scl_pin);
+ self->sda_pin = NO_PIN;
+ self->scl_pin = NO_PIN;
+}
+
+static int i2c_slave_check_error(i2cslave_i2c_slave_obj_t *self, bool raise) {
+ if (!self->sercom->I2CS.INTFLAG.bit.ERROR) {
+ return 0;
+ }
+
+ int err = MP_EIO;
+
+ if (self->sercom->I2CS.STATUS.bit.LOWTOUT || self->sercom->I2CS.STATUS.bit.SEXTTOUT) {
+ err = MP_ETIMEDOUT;
+ }
+
+ self->sercom->I2CS.INTFLAG.reg = SERCOM_I2CS_INTFLAG_ERROR; // Clear flag
+
+ if (raise) {
+ mp_raise_OSError(err);
+ }
+ return -err;
+}
+
+int common_hal_i2cslave_i2c_slave_is_addressed(i2cslave_i2c_slave_obj_t *self, uint8_t *address, bool *is_read, bool *is_restart)
+{
+ int err = i2c_slave_check_error(self, false);
+ if (err) {
+ return err;
+ }
+
+ if (!self->sercom->I2CS.INTFLAG.bit.AMATCH) {
+ return 0;
+ }
+
+ self->writing = false;
+
+ *address = self->sercom->I2CS.DATA.reg >> 1;
+ *is_read = self->sercom->I2CS.STATUS.bit.DIR;
+ *is_restart = self->sercom->I2CS.STATUS.bit.SR;
+
+ for (unsigned int i = 0; i < self->num_addresses; i++) {
+ if (*address == self->addresses[i]) {
+ common_hal_i2cslave_i2c_slave_ack(self, true);
+ return 1;
+ }
+ }
+
+ // This should clear AMATCH, but it doesn't...
+ common_hal_i2cslave_i2c_slave_ack(self, false);
+ return 0;
+}
+
+int common_hal_i2cslave_i2c_slave_read_byte(i2cslave_i2c_slave_obj_t *self, uint8_t *data) {
+ for (int t = 0; t < 100 && !self->sercom->I2CS.INTFLAG.reg; t++) {
+ mp_hal_delay_us(10);
+ }
+
+ i2c_slave_check_error(self, true);
+
+ if (!self->sercom->I2CS.INTFLAG.bit.DRDY ||
+ self->sercom->I2CS.INTFLAG.bit.PREC ||
+ self->sercom->I2CS.INTFLAG.bit.AMATCH) {
+ return 0;
+ }
+
+ *data = self->sercom->I2CS.DATA.reg;
+ return 1;
+}
+
+int common_hal_i2cslave_i2c_slave_write_byte(i2cslave_i2c_slave_obj_t *self, uint8_t data) {
+ for (int t = 0; !self->sercom->I2CS.INTFLAG.reg && t < 100; t++) {
+ mp_hal_delay_us(10);
+ }
+
+ i2c_slave_check_error(self, true);
+
+ if (self->sercom->I2CS.INTFLAG.bit.PREC) {
+ return 0;
+ }
+
+ // RXNACK can carry over from the previous transfer
+ if (self->writing && self->sercom->I2CS.STATUS.bit.RXNACK) {
+ return 0;
+ }
+
+ self->writing = true;
+
+ if (!self->sercom->I2CS.INTFLAG.bit.DRDY) {
+ return 0;
+ }
+
+ self->sercom->I2CS.DATA.bit.DATA = data; // Send data
+
+ return 1;
+}
+
+void common_hal_i2cslave_i2c_slave_ack(i2cslave_i2c_slave_obj_t *self, bool ack) {
+ self->sercom->I2CS.CTRLB.bit.ACKACT = !ack;
+ self->sercom->I2CS.CTRLB.bit.CMD = 0x03;
+}
+
+void common_hal_i2cslave_i2c_slave_close(i2cslave_i2c_slave_obj_t *self) {
+ for (int t = 0; !self->sercom->I2CS.INTFLAG.reg && t < 100; t++) {
+ mp_hal_delay_us(10);
+ }
+
+ if (self->sercom->I2CS.INTFLAG.bit.AMATCH || !self->sercom->I2CS.STATUS.bit.CLKHOLD) {
+ return;
+ }
+
+ if (!self->sercom->I2CS.STATUS.bit.DIR) {
+ common_hal_i2cslave_i2c_slave_ack(self, false);
+ } else {
+ int i = 0;
+ while (self->sercom->I2CS.INTFLAG.reg == SERCOM_I2CS_INTFLAG_DRDY) {
+ if (mp_hal_is_interrupted()) {
+ return;
+ }
+
+ self->sercom->I2CS.DATA.bit.DATA = 0xff; // Send dummy byte
+
+ // Wait for a result (if any).
+ // test_byte_word.py::TestWord::test_write_seq leaves us with no INTFLAGs set in some of the tests
+ for (int t = 0; !self->sercom->I2CS.INTFLAG.reg && t < 100; t++) {
+ mp_hal_delay_us(10);
+ }
+
+ if (++i > 1000) { // Avoid getting stuck "forever"
+ mp_raise_OSError(MP_EIO);
+ }
+ }
+ }
+
+ if (self->sercom->I2CS.INTFLAG.bit.AMATCH) {
+ return;
+ }
+
+ if (self->sercom->I2CS.STATUS.bit.CLKHOLD) {
+ // Unable to release the clock.
+ // The slave might have to be re-initialized to get unstuck.
+ mp_raise_OSError(MP_EIO);
+ }
+}
diff --git a/ports/atmel-samd/common-hal/i2cslave/I2CSlave.h b/ports/atmel-samd/common-hal/i2cslave/I2CSlave.h
new file mode 100644
index 000000000..bf4f877bd
--- /dev/null
+++ b/ports/atmel-samd/common-hal/i2cslave/I2CSlave.h
@@ -0,0 +1,45 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Noralf Trønnes
+ *
+ * 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_ATMEL_SAMD_COMMON_HAL_BUSIO_I2C_SLAVE_H
+#define MICROPY_INCLUDED_ATMEL_SAMD_COMMON_HAL_BUSIO_I2C_SLAVE_H
+
+#include "common-hal/microcontroller/Pin.h"
+#include "py/obj.h"
+
+typedef struct {
+ mp_obj_base_t base;
+
+ uint8_t *addresses;
+ unsigned int num_addresses;
+
+ Sercom *sercom;
+ uint8_t scl_pin;
+ uint8_t sda_pin;
+ bool writing;
+} i2cslave_i2c_slave_obj_t;
+
+#endif // MICROPY_INCLUDED_ATMEL_SAMD_COMMON_HAL_BUSIO_I2C_SLAVE_H
diff --git a/ports/atmel-samd/common-hal/i2cslave/__init__.c b/ports/atmel-samd/common-hal/i2cslave/__init__.c
new file mode 100644
index 000000000..f289bbc0e
--- /dev/null
+++ b/ports/atmel-samd/common-hal/i2cslave/__init__.c
@@ -0,0 +1 @@
+// No i2cslave module functions.
diff --git a/ports/atmel-samd/mpconfigport.h b/ports/atmel-samd/mpconfigport.h
index 8b921c2a9..576325461 100644
--- a/ports/atmel-samd/mpconfigport.h
+++ b/ports/atmel-samd/mpconfigport.h
@@ -174,6 +174,7 @@ extern const struct _mp_obj_module_t digitalio_module;
extern const struct _mp_obj_module_t pulseio_module;
extern const struct _mp_obj_module_t busio_module;
extern const struct _mp_obj_module_t board_module;
+extern const struct _mp_obj_module_t i2cslave_module;
extern const struct _mp_obj_module_t math_module;
extern const struct _mp_obj_module_t os_module;
extern const struct _mp_obj_module_t random_module;
@@ -225,11 +226,18 @@ extern const struct _mp_obj_module_t usb_hid_module;
#define AUDIOIO_MODULE { MP_OBJ_NEW_QSTR(MP_QSTR_audioio), (mp_obj_t)&audioio_module },
#endif
+ #ifdef CIRCUITPY_I2CSLAVE
+ #define I2CSLAVE_MODULE { MP_OBJ_NEW_QSTR(MP_QSTR_i2cslave), (mp_obj_t)&i2cslave_module },
+ #else
+ #define I2CSLAVE_MODULE
+ #endif
+
#ifndef EXTRA_BUILTIN_MODULES
#define EXTRA_BUILTIN_MODULES \
AUDIOIO_MODULE \
AUDIOBUSIO_MODULE \
{ MP_OBJ_NEW_QSTR(MP_QSTR_bitbangio), (mp_obj_t)&bitbangio_module }, \
+ I2CSLAVE_MODULE \
{ MP_OBJ_NEW_QSTR(MP_QSTR_rotaryio), (mp_obj_t)&rotaryio_module }, \
{ MP_OBJ_NEW_QSTR(MP_QSTR_gamepad),(mp_obj_t)&gamepad_module }
#endif
diff --git a/shared-bindings/index.rst b/shared-bindings/index.rst
index bcd6e1d1e..ec7f89f03 100644
--- a/shared-bindings/index.rst
+++ b/shared-bindings/index.rst
@@ -34,6 +34,7 @@ Module Supported Ports
`digitalio` **All Supported**
`gamepad` **SAMD Express, nRF**
`hashlib` **ESP8266**
+`i2cslave` **SAMD Express**
`math` **All Supported**
`microcontroller` **All Supported**
`multiterminal` **ESP8266**
generated by cgit v1.2.3 (git 2.39.1) at 2026-08-08 11:38:56 +0000