mirror of
https://github.com/micropython/micropython.git
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226 lines
8.9 KiB
C
226 lines
8.9 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2025 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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// This file is never compiled standalone, it's included directly from
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// extmod/machine_i2c_target.c via MICROPY_PY_MACHINE_I2C_TARGET_INCLUDEFILE.
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#include "machine_i2c.h"
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#include "driver/i2c_slave.h"
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// These headers are needed to call i2c_ll_txfifo_rst().
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#include "hal/i2c_ll.h"
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#include "../i2c_private.h"
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typedef struct _machine_i2c_target_obj_t {
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mp_obj_base_t base;
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i2c_slave_dev_handle_t handle;
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i2c_slave_config_t config;
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uint8_t state;
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bool stop_pending;
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bool irq_active;
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int index;
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const i2c_slave_rx_done_event_data_t *rx_done_event_data;
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} machine_i2c_target_obj_t;
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static machine_i2c_target_obj_t machine_i2c_target_obj[I2C_NUM_MAX];
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/******************************************************************************/
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// ESP-IDF hardware bindings
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// Called when the controller is about to read from the TX/send buffer.
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static bool i2c_slave_request_cb(i2c_slave_dev_handle_t i2c_slave, const i2c_slave_request_event_data_t *evt_data, void *arg) {
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machine_i2c_target_obj_t *self = arg;
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machine_i2c_target_data_t *data = &machine_i2c_target_data[self->config.i2c_port];
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// Flush hardware TX FIFO to get rid of any data from a previous read.
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i2c_ll_txfifo_rst(self->handle->base->hal.dev);
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// Perform an entire read transaction, including start, read and stop events.
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// We don't know how much data the controller will read, so write the entire
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// memory buffer to the TX FIFO.
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machine_i2c_target_data_addr_match(data, true);
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for (uint32_t i = 0; i < data->mem_len; ++i) {
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machine_i2c_target_data_read_request(self, data);
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}
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machine_i2c_target_data_restart_or_stop(data);
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// A higher priority task was not woken up.
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return false;
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}
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// Called when the controller has written into the RX/receive buffer.
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static bool i2c_slave_receive_cb(i2c_slave_dev_handle_t i2c_slave, const i2c_slave_rx_done_event_data_t *evt_data, void *arg) {
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machine_i2c_target_obj_t *self = arg;
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machine_i2c_target_data_t *data = &machine_i2c_target_data[self->config.i2c_port];
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// Perform an entire write transaction, including start, read and stop events.
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machine_i2c_target_data_addr_match(data, false);
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self->index = 0;
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self->rx_done_event_data = evt_data;
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while (self->index < self->rx_done_event_data->length) {
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machine_i2c_target_data_write_request(self, data);
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}
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machine_i2c_target_data_restart_or_stop(data);
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// A higher priority task was not woken up.
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return false;
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}
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static void i2c_target_init(machine_i2c_target_obj_t *self, machine_i2c_target_data_t *data, uint32_t addr, uint32_t addrsize, bool first_init) {
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if (!first_init && self->handle != NULL) {
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i2c_del_slave_device(self->handle);
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self->handle = NULL;
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}
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self->config.clk_source = I2C_CLK_SRC_DEFAULT;
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self->config.slave_addr = addr;
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self->config.send_buf_depth = data->mem_len;
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self->config.receive_buf_depth = data->mem_len;
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if (addrsize == 7) {
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self->config.addr_bit_len = I2C_ADDR_BIT_LEN_7;
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} else {
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#if SOC_I2C_SUPPORT_10BIT_ADDR
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self->config.addr_bit_len = I2C_ADDR_BIT_LEN_10;
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#else
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mp_raise_ValueError(MP_ERROR_TEXT("10-bit address unsupported"));
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#endif
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}
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self->config.intr_priority = 0; // 0 selects the default
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self->config.flags.allow_pd = 0;
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self->config.flags.enable_internal_pullup = 1;
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ESP_ERROR_CHECK(i2c_new_slave_device(&self->config, &self->handle));
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i2c_slave_event_callbacks_t cbs = {
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.on_receive = i2c_slave_receive_cb,
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.on_request = i2c_slave_request_cb,
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};
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ESP_ERROR_CHECK(i2c_slave_register_event_callbacks(self->handle, &cbs, self));
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}
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/******************************************************************************/
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// I2CTarget port implementation
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static inline size_t mp_machine_i2c_target_get_index(machine_i2c_target_obj_t *self) {
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return self->config.i2c_port;
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}
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static void mp_machine_i2c_target_event_callback(machine_i2c_target_irq_obj_t *irq) {
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mp_irq_handler(&irq->base);
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}
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static size_t mp_machine_i2c_target_read_bytes(machine_i2c_target_obj_t *self, size_t len, uint8_t *buf) {
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size_t i = 0;
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while (i < len && self->index < self->rx_done_event_data->length) {
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buf[i++] = self->rx_done_event_data->buffer[self->index++];
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}
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return i;
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}
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static size_t mp_machine_i2c_target_write_bytes(machine_i2c_target_obj_t *self, size_t len, const uint8_t *buf) {
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uint32_t write_len;
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i2c_slave_write(self->handle, buf, len, &write_len, 1000);
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return write_len;
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}
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static void mp_machine_i2c_target_irq_config(machine_i2c_target_obj_t *self, unsigned int trigger) {
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}
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static mp_obj_t mp_machine_i2c_target_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
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enum { ARG_id, ARG_addr, ARG_addrsize, ARG_mem, ARG_mem_addrsize, ARG_scl, ARG_sda };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_id, MP_ARG_INT, {.u_int = 0} },
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{ MP_QSTR_addr, MP_ARG_REQUIRED | MP_ARG_INT },
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{ MP_QSTR_addrsize, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 7} },
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{ MP_QSTR_mem, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
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{ MP_QSTR_mem_addrsize, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 8} },
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{ MP_QSTR_scl, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
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{ MP_QSTR_sda, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
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};
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// Parse args.
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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int i2c_id = args[ARG_id].u_int;
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// Check if the I2C bus is valid
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if (i2c_id < 0 || i2c_id >= MP_ARRAY_SIZE(machine_i2c_target_obj)) {
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mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("I2CTarget(%d) doesn't exist"), i2c_id);
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}
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// Get static peripheral object.
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machine_i2c_target_obj_t *self = &machine_i2c_target_obj[i2c_id];
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bool first_init = false;
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if (self->base.type == NULL) {
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// Created for the first time, set default pins
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self->base.type = &machine_i2c_target_type;
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self->config.i2c_port = i2c_id;
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if (self->config.i2c_port == 0) {
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self->config.scl_io_num = MICROPY_HW_I2C0_SCL;
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self->config.sda_io_num = MICROPY_HW_I2C0_SDA;
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} else {
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self->config.scl_io_num = MICROPY_HW_I2C1_SCL;
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self->config.sda_io_num = MICROPY_HW_I2C1_SDA;
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}
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first_init = true;
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}
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// Initialise data.
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self->state = STATE_IDLE;
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self->stop_pending = false;
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self->irq_active = false;
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MP_STATE_PORT(machine_i2c_target_mem_obj)[i2c_id] = args[ARG_mem].u_obj;
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machine_i2c_target_data_t *data = &machine_i2c_target_data[i2c_id];
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machine_i2c_target_data_init(data, args[ARG_mem].u_obj, args[ARG_mem_addrsize].u_int);
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// Set SCL/SDA pins if configured.
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if (args[ARG_scl].u_obj != mp_const_none) {
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self->config.scl_io_num = mp_hal_get_pin_obj(args[ARG_scl].u_obj);
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}
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if (args[ARG_sda].u_obj != mp_const_none) {
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self->config.sda_io_num = mp_hal_get_pin_obj(args[ARG_sda].u_obj);
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}
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// Initialise the I2C target.
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i2c_target_init(self, data, args[ARG_addr].u_int, args[ARG_addrsize].u_int, first_init);
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return MP_OBJ_FROM_PTR(self);
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}
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static void mp_machine_i2c_target_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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machine_i2c_target_obj_t *self = MP_OBJ_TO_PTR(self_in);
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mp_printf(print, "I2CTarget(%u, addr=%u, scl=%u, sda=%u)",
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self->config.i2c_port, self->config.slave_addr, self->config.scl_io_num, self->config.sda_io_num);
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}
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static void mp_machine_i2c_target_deinit(machine_i2c_target_obj_t *self) {
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if (self->handle != NULL) {
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i2c_del_slave_device(self->handle);
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self->handle = NULL;
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}
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}
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