192 lines
6.6 KiB
C
192 lines
6.6 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) 2019 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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#include "py/runtime.h"
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#include "py/mphal.h"
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#include "py/mperrno.h"
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#include "extmod/machine_i2c.h"
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#include "modmachine.h"
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#include "driver/i2c.h"
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#ifndef MICROPY_HW_I2C0_SCL
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#define MICROPY_HW_I2C0_SCL (GPIO_NUM_18)
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#define MICROPY_HW_I2C0_SDA (GPIO_NUM_19)
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#endif
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#ifndef MICROPY_HW_I2C1_SCL
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#if CONFIG_IDF_TARGET_ESP32
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#define MICROPY_HW_I2C1_SCL (GPIO_NUM_25)
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#define MICROPY_HW_I2C1_SDA (GPIO_NUM_26)
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#else
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#define MICROPY_HW_I2C1_SCL (GPIO_NUM_9)
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#define MICROPY_HW_I2C1_SDA (GPIO_NUM_8)
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#endif
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#endif
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#define I2C_DEFAULT_TIMEOUT_US (10000) // 10ms
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typedef struct _machine_hw_i2c_obj_t {
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mp_obj_base_t base;
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i2c_port_t port : 8;
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gpio_num_t scl : 8;
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gpio_num_t sda : 8;
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} machine_hw_i2c_obj_t;
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STATIC machine_hw_i2c_obj_t machine_hw_i2c_obj[I2C_NUM_MAX];
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STATIC void machine_hw_i2c_init(machine_hw_i2c_obj_t *self, uint32_t freq, uint32_t timeout_us, bool first_init) {
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if (!first_init) {
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i2c_driver_delete(self->port);
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}
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i2c_config_t conf = {
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.mode = I2C_MODE_MASTER,
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.sda_io_num = self->sda,
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.sda_pullup_en = GPIO_PULLUP_ENABLE,
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.scl_io_num = self->scl,
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.scl_pullup_en = GPIO_PULLUP_ENABLE,
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.master.clk_speed = freq,
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};
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i2c_param_config(self->port, &conf);
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i2c_set_timeout(self->port, I2C_APB_CLK_FREQ / 1000000 * timeout_us);
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i2c_driver_install(self->port, I2C_MODE_MASTER, 0, 0, 0);
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}
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int machine_hw_i2c_transfer(mp_obj_base_t *self_in, uint16_t addr, size_t n, mp_machine_i2c_buf_t *bufs, unsigned int flags) {
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machine_hw_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
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i2c_cmd_handle_t cmd = i2c_cmd_link_create();
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i2c_master_start(cmd);
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i2c_master_write_byte(cmd, addr << 1 | (flags & MP_MACHINE_I2C_FLAG_READ), true);
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int data_len = 0;
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for (; n--; ++bufs) {
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if (flags & MP_MACHINE_I2C_FLAG_READ) {
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i2c_master_read(cmd, bufs->buf, bufs->len, n == 0 ? I2C_MASTER_LAST_NACK : I2C_MASTER_ACK);
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} else {
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if (bufs->len != 0) {
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i2c_master_write(cmd, bufs->buf, bufs->len, true);
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}
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}
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data_len += bufs->len;
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}
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if (flags & MP_MACHINE_I2C_FLAG_STOP) {
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i2c_master_stop(cmd);
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}
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// TODO proper timeout
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esp_err_t err = i2c_master_cmd_begin(self->port, cmd, 100 * (1 + data_len) / portTICK_RATE_MS);
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i2c_cmd_link_delete(cmd);
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if (err == ESP_FAIL) {
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return -MP_ENODEV;
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} else if (err == ESP_ERR_TIMEOUT) {
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return -MP_ETIMEDOUT;
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} else if (err != ESP_OK) {
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return -abs(err);
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}
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return data_len;
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}
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/******************************************************************************/
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// MicroPython bindings for machine API
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STATIC void machine_hw_i2c_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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machine_hw_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
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int h, l;
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i2c_get_period(self->port, &h, &l);
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mp_printf(print, "I2C(%u, scl=%u, sda=%u, freq=%u)",
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self->port, self->scl, self->sda, I2C_APB_CLK_FREQ / (h + l));
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}
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mp_obj_t machine_hw_i2c_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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MP_MACHINE_I2C_CHECK_FOR_LEGACY_SOFTI2C_CONSTRUCTION(n_args, n_kw, all_args);
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// Parse args
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enum { ARG_id, ARG_scl, ARG_sda, ARG_freq, ARG_timeout };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_id, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_scl, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_sda, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_freq, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 400000} },
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{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = I2C_DEFAULT_TIMEOUT_US} },
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};
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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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// Get I2C bus
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mp_int_t i2c_id = mp_obj_get_int(args[ARG_id].u_obj);
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if (!(I2C_NUM_0 <= i2c_id && i2c_id < I2C_NUM_MAX)) {
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mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("I2C(%d) doesn't exist"), i2c_id);
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}
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// Get static peripheral object
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machine_hw_i2c_obj_t *self = (machine_hw_i2c_obj_t *)&machine_hw_i2c_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_hw_i2c_type;
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self->port = i2c_id;
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if (self->port == I2C_NUM_0) {
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self->scl = MICROPY_HW_I2C0_SCL;
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self->sda = MICROPY_HW_I2C0_SDA;
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} else {
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self->scl = MICROPY_HW_I2C1_SCL;
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self->sda = MICROPY_HW_I2C1_SDA;
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}
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first_init = true;
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}
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// Set SCL/SDA pins if given
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if (args[ARG_scl].u_obj != MP_OBJ_NULL) {
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self->scl = 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_OBJ_NULL) {
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self->sda = mp_hal_get_pin_obj(args[ARG_sda].u_obj);
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}
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// Initialise the I2C peripheral
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machine_hw_i2c_init(self, args[ARG_freq].u_int, args[ARG_timeout].u_int, first_init);
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return MP_OBJ_FROM_PTR(self);
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}
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STATIC const mp_machine_i2c_p_t machine_hw_i2c_p = {
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.transfer = machine_hw_i2c_transfer,
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};
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const mp_obj_type_t machine_hw_i2c_type = {
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{ &mp_type_type },
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.name = MP_QSTR_I2C,
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.print = machine_hw_i2c_print,
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.make_new = machine_hw_i2c_make_new,
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.protocol = &machine_hw_i2c_p,
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.locals_dict = (mp_obj_dict_t *)&mp_machine_i2c_locals_dict,
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};
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