Rp2040 i2ctarget support

ports/raspberrypi/common-hal/i2ctarget/I2CTarget.c

@@ -0,0 +1,156 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2022 Mark Komus, Ken Stillson, im-redactd
+ *
+ * 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/i2ctarget/I2CTarget.h"
+
+#include "common-hal/busio/I2C.h"
+
+#include "py/mperrno.h"
+#include "py/mphal.h"
+#include "shared-bindings/busio/I2C.h"
+#include "shared-bindings/microcontroller/Pin.h"
+#include "py/runtime.h"
+
+#include "src/rp2_common/hardware_gpio/include/hardware/gpio.h"
+
+STATIC i2c_inst_t *i2c[2] = {i2c0, i2c1};
+
+#define NO_PIN 0xff
+
+void common_hal_i2ctarget_i2c_target_construct(i2ctarget_i2c_target_obj_t *self, const mcu_pin_obj_t *scl, const mcu_pin_obj_t *sda,
+    uint8_t *addresses, unsigned int num_addresses, bool smbus) {
+    self->peripheral = NULL;
+
+    // I2C pins have a regular pattern. SCL is always odd and SDA is even. They match up in pairs
+    // so we can divide by two to get the instance. This pattern repeats.
+    size_t scl_instance = (scl->number / 2) % 2;
+    size_t sda_instance = (sda->number / 2) % 2;
+    if (scl->number % 2 == 1 && sda->number % 2 == 0 && scl_instance == sda_instance) {
+        self->peripheral = i2c[sda_instance];
+    }
+
+    if (self->peripheral == NULL) {
+        raise_ValueError_invalid_pins();
+    }
+
+    if ((i2c_get_hw(self->peripheral)->enable & I2C_IC_ENABLE_ENABLE_BITS) != 0) {
+        mp_raise_ValueError(translate("I2C peripheral in use"));
+    }
+
+    if (num_addresses > 1) {
+        mp_raise_ValueError(translate("Only one address is allowed"));
+    }
+
+    self->addresses = addresses;
+    self->num_addresses = num_addresses;
+    self->scl_pin = scl->number;
+    self->sda_pin = sda->number;
+
+    // Have to specify a baudrate even if the i2c target does not use it
+    const uint32_t frequency = 400000;
+    i2c_init(self->peripheral, frequency);
+
+    gpio_set_function(sda->number, GPIO_FUNC_I2C);
+    gpio_set_function(scl->number, GPIO_FUNC_I2C);
+
+    gpio_set_pulls(sda->number, true, false);
+    gpio_set_pulls(scl->number, true, false);
+
+    self->peripheral->hw->intr_mask |= I2C_IC_INTR_MASK_M_RESTART_DET_BITS;
+    i2c_set_slave_mode(self->peripheral, true, self->addresses[0]);
+
+    return;
+}
+
+bool common_hal_i2ctarget_i2c_target_deinited(i2ctarget_i2c_target_obj_t *self) {
+    return self->sda_pin == NO_PIN;
+}
+
+void common_hal_i2ctarget_i2c_target_deinit(i2ctarget_i2c_target_obj_t *self) {
+    if (common_hal_i2ctarget_i2c_target_deinited(self)) {
+        return;
+    }
+
+    i2c_deinit(self->peripheral);
+
+    reset_pin_number(self->sda_pin);
+    reset_pin_number(self->scl_pin);
+    self->sda_pin = NO_PIN;
+    self->scl_pin = NO_PIN;
+
+    return;
+}
+
+static int i2c_peripheral_check_error(i2ctarget_i2c_target_obj_t *self, bool raise) {
+    return 0;
+}
+
+int common_hal_i2ctarget_i2c_target_is_addressed(i2ctarget_i2c_target_obj_t *self, uint8_t *address, bool *is_read, bool *is_restart) {
+    if (!((self->peripheral->hw->raw_intr_stat & I2C_IC_INTR_STAT_R_RX_FULL_BITS) || (self->peripheral->hw->raw_intr_stat & I2C_IC_INTR_STAT_R_RD_REQ_BITS))) {
+        return 0;
+    }
+
+    *address = self->peripheral->hw->sar;
+    *is_read = !(self->peripheral->hw->raw_intr_stat & I2C_IC_INTR_STAT_R_RX_FULL_BITS);
+    *is_restart = ((self->peripheral->hw->raw_intr_stat & I2C_IC_RAW_INTR_STAT_RD_REQ_RESET) != 0);
+
+    common_hal_i2ctarget_i2c_target_ack(self, true);
+    return 1;
+}
+
+int common_hal_i2ctarget_i2c_target_read_byte(i2ctarget_i2c_target_obj_t *self, uint8_t *data) {
+    if (self->peripheral->hw->status & I2C_IC_STATUS_RFNE_BITS) {
+        *data = (uint8_t)self->peripheral->hw->data_cmd;
+        return 1;
+    } else {
+        return 0;
+    }
+}
+
+int common_hal_i2ctarget_i2c_target_write_byte(i2ctarget_i2c_target_obj_t *self, uint8_t data) {
+    if (self->peripheral->hw->raw_intr_stat & I2C_IC_INTR_STAT_R_TX_ABRT_BITS) {
+        self->peripheral->hw->clr_tx_abrt;
+    }
+
+    const size_t IC_TX_BUFFER_DEPTH = 16;
+    size_t space = IC_TX_BUFFER_DEPTH - self->peripheral->hw->txflr;
+
+    if (space > 0) {
+        self->peripheral->hw->data_cmd = data;
+        self->peripheral->hw->clr_rd_req;
+        return 1;
+    } else {
+        return 0;
+    }
+}
+
+void common_hal_i2ctarget_i2c_target_ack(i2ctarget_i2c_target_obj_t *self, bool ack) {
+    return;
+}
+
+void common_hal_i2ctarget_i2c_target_close(i2ctarget_i2c_target_obj_t *self) {
+    return;
+}

ports/raspberrypi/common-hal/i2ctarget/I2CTarget.h

@@ -0,0 +1,46 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2022 Mark Komus, Ken Stillson, im-redactd
+ *
+ * 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_RPI_COMMON_HAL_I2C_TARGET_H
+#define MICROPY_INCLUDED_RPI_COMMON_HAL_I2C_TARGET_H
+
+#include "py/obj.h"
+#include "common-hal/microcontroller/Pin.h"
+#include "src/rp2_common/hardware_i2c/include/hardware/i2c.h"
+
+typedef struct {
+    mp_obj_base_t base;
+
+    uint8_t *addresses;
+    unsigned int num_addresses;
+
+    i2c_inst_t *peripheral;
+
+    uint8_t scl_pin;
+    uint8_t sda_pin;
+} i2ctarget_i2c_target_obj_t;
+
+#endif MICROPY_INCLUDED_RPI_COMMON_HAL_BUSIO_I2C_TARGET_H

ports/raspberrypi/common-hal/i2ctarget/__init__.c

@@ -0,0 +1 @@
+// No i2ctarget module functions.

ports/raspberrypi/mpconfigport.mk

@@ -20,7 +20,7 @@ CIRCUITPY_ROTARYIO_SOFTENCODER = 1
 # Things that need to be implemented.
 # Use PWM interally
 CIRCUITPY_FREQUENCYIO = 0
-CIRCUITPY_I2CTARGET = 0
+CIRCUITPY_I2CTARGET = 1
 CIRCUITPY_NVM = 1
 # Use PIO interally
 CIRCUITPY_PULSEIO ?= 1