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parser.py

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  • Forked from card10 / firmware
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    machine_i2c.c 6.37 KiB
    /*
     * This file is part of the MicroPython project, http://micropython.org/
     *
     * The MIT License (MIT)
     *
     * Copyright (c) 2019 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.
     */
    
    #include "py/runtime.h"
    #include "py/mphal.h"
    #include "py/mperrno.h"
    #include "extmod/machine_i2c.h"
    
    #include "driver/i2c.h"
    
    #define I2C_0_DEFAULT_SCL (GPIO_NUM_18)
    #define I2C_0_DEFAULT_SDA (GPIO_NUM_19)
    #define I2C_1_DEFAULT_SCL (GPIO_NUM_25)
    #define I2C_1_DEFAULT_SDA (GPIO_NUM_26)
    
    #define I2C_DEFAULT_TIMEOUT_US (10000) // 10ms
    
    typedef struct _machine_hw_i2c_obj_t {
        mp_obj_base_t base;
        i2c_port_t port : 8;
        gpio_num_t scl : 8;
        gpio_num_t sda : 8;
    } machine_hw_i2c_obj_t;
    
    STATIC const mp_obj_type_t machine_hw_i2c_type;
    STATIC machine_hw_i2c_obj_t machine_hw_i2c_obj[I2C_NUM_MAX];
    
    STATIC void machine_hw_i2c_init(machine_hw_i2c_obj_t *self, uint32_t freq, uint32_t timeout_us, bool first_init) {
        if (!first_init) {
            i2c_driver_delete(self->port);
        }
        i2c_config_t conf = {
            .mode = I2C_MODE_MASTER,
            .sda_io_num = self->sda,
            .sda_pullup_en = GPIO_PULLUP_ENABLE,
            .scl_io_num = self->scl,
            .scl_pullup_en = GPIO_PULLUP_ENABLE,
            .master.clk_speed = freq,
        };
        i2c_param_config(self->port, &conf);
        i2c_set_timeout(self->port, I2C_APB_CLK_FREQ / 1000000 * timeout_us);
        i2c_driver_install(self->port, I2C_MODE_MASTER, 0, 0, 0);
    }
    
    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) {
        machine_hw_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
    
        i2c_cmd_handle_t cmd = i2c_cmd_link_create();
        i2c_master_start(cmd);
        i2c_master_write_byte(cmd, addr << 1 | (flags & MP_MACHINE_I2C_FLAG_READ), true);
    
        int data_len = 0;
        for (; n--; ++bufs) {
            if (flags & MP_MACHINE_I2C_FLAG_READ) {
                i2c_master_read(cmd, bufs->buf, bufs->len, n == 0 ? I2C_MASTER_LAST_NACK : I2C_MASTER_ACK);
            } else {
                if (bufs->len != 0) {
                    i2c_master_write(cmd, bufs->buf, bufs->len, true);
                }
            }
            data_len += bufs->len;
        }
    
        if (flags & MP_MACHINE_I2C_FLAG_STOP) {
            i2c_master_stop(cmd);
        }
    
        // TODO proper timeout
        esp_err_t err = i2c_master_cmd_begin(self->port, cmd, 100 * (1 + data_len) / portTICK_RATE_MS);
        i2c_cmd_link_delete(cmd);
    
        if (err == ESP_FAIL) {
            return -MP_ENODEV;
        } else if (err == ESP_ERR_TIMEOUT) {
            return -MP_ETIMEDOUT;
        } else if (err != ESP_OK) {
            return -abs(err);
        }
    
        return data_len;
    }
    
    /******************************************************************************/
    // MicroPython bindings for machine API
    
    STATIC void machine_hw_i2c_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
        machine_hw_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
        int h, l;
        i2c_get_period(self->port, &h, &l);
        mp_printf(print, "I2C(%u, scl=%u, sda=%u, freq=%u)",
            self->port, self->scl, self->sda, I2C_APB_CLK_FREQ / (h + l));
    }
    
    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) {
        // Parse args
        enum { ARG_id, ARG_scl, ARG_sda, ARG_freq, ARG_timeout };
        static const mp_arg_t allowed_args[] = {
            { MP_QSTR_id, MP_ARG_REQUIRED | MP_ARG_OBJ },
            { MP_QSTR_scl, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
            { MP_QSTR_sda, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
            { MP_QSTR_freq, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 400000} },
            { MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = I2C_DEFAULT_TIMEOUT_US} },
        };
        mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
        mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
    
        // Get I2C bus
        mp_int_t i2c_id = mp_obj_get_int(args[ARG_id].u_obj);
        if (!(I2C_NUM_0 <= i2c_id && i2c_id < I2C_NUM_MAX)) {
            nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "I2C(%d) doesn't exist", i2c_id));
        }
    
        // Get static peripheral object
        machine_hw_i2c_obj_t *self = (machine_hw_i2c_obj_t*)&machine_hw_i2c_obj[i2c_id];
    
        bool first_init = false;
        if (self->base.type == NULL) {
            // Created for the first time, set default pins
            self->base.type = &machine_hw_i2c_type;
            self->port = i2c_id;
            if (self->port == I2C_NUM_0) {
                self->scl = I2C_0_DEFAULT_SCL;
                self->sda = I2C_0_DEFAULT_SDA;
            } else {
                self->scl = I2C_1_DEFAULT_SCL;
                self->sda = I2C_1_DEFAULT_SDA;
            }
            first_init = true;
        }
    
        // Set SCL/SDA pins if given
        if (args[ARG_scl].u_obj != MP_OBJ_NULL) {
            self->scl = mp_hal_get_pin_obj(args[ARG_scl].u_obj);
        }
        if (args[ARG_sda].u_obj != MP_OBJ_NULL) {
            self->sda = mp_hal_get_pin_obj(args[ARG_sda].u_obj);
        }
    
        // Initialise the I2C peripheral
        machine_hw_i2c_init(self, args[ARG_freq].u_int, args[ARG_timeout].u_int, first_init);
    
        return MP_OBJ_FROM_PTR(self);
    }
    
    STATIC const mp_machine_i2c_p_t machine_hw_i2c_p = {
        .transfer = machine_hw_i2c_transfer,
    };
    
    STATIC const mp_obj_type_t machine_hw_i2c_type = {
        { &mp_type_type },
        .name = MP_QSTR_I2C,
        .print = machine_hw_i2c_print,
        .make_new = machine_hw_i2c_make_new,
        .protocol = &machine_hw_i2c_p,
        .locals_dict = (mp_obj_dict_t*)&mp_machine_soft_i2c_locals_dict,
    };