/* * This file is part of the MicroPython project, http://micropython.org/ * * The MIT License (MIT) * * Copyright (c) 2016-2018 Damien P. George * Copyright (c) 2021,2022 Renesas Electronics Corporation * * 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 #include #include "py/runtime.h" #include "py/mphal.h" #include "py/mperrno.h" #include "extmod/modmachine.h" #include "ra_i2c.h" #if MICROPY_PY_MACHINE_I2C #define DEFAULT_I2C_FREQ (400000) #define DEFAULT_I2C_TIMEOUT (1000) typedef struct _machine_i2c_obj_t { mp_obj_base_t base; R_IIC0_Type *i2c_inst; uint8_t i2c_id; mp_hal_pin_obj_t scl; mp_hal_pin_obj_t sda; uint32_t freq; } machine_i2c_obj_t; static machine_i2c_obj_t machine_i2c_obj[] = { #if defined(MICROPY_HW_I2C0_SCL) {{&machine_i2c_type}, R_IIC0, 0, MICROPY_HW_I2C0_SCL, MICROPY_HW_I2C0_SDA, 0}, #endif #if defined(MICROPY_HW_I2C1_SCL) {{&machine_i2c_type}, R_IIC1, 1, MICROPY_HW_I2C1_SCL, MICROPY_HW_I2C1_SDA, 0}, #endif #if defined(MICROPY_HW_I2C2_SCL) {{&machine_i2c_type}, R_IIC2, 2, MICROPY_HW_I2C2_SCL, MICROPY_HW_I2C2_SDA, 0}, #endif }; static int i2c_read(machine_i2c_obj_t *self, uint16_t addr, uint8_t *dest, size_t len, bool stop); static int i2c_write(machine_i2c_obj_t *self, uint16_t addr, const uint8_t *src, size_t len, bool stop); static int i2c_read(machine_i2c_obj_t *self, uint16_t addr, uint8_t *dest, size_t len, bool stop) { bool flag; xaction_t action; xaction_unit_t unit; ra_i2c_xunit_init(&unit, (uint8_t *)dest, (uint32_t)len, true, (void *)NULL); ra_i2c_xaction_init(&action, (xaction_unit_t *)&unit, 1, (uint32_t)addr, stop); flag = ra_i2c_action_execute(self->i2c_inst, &action, false, DEFAULT_I2C_TIMEOUT); return flag? len:-1; } static int i2c_write(machine_i2c_obj_t *self, uint16_t addr, const uint8_t *src, size_t len, bool stop) { bool flag; xaction_t action; xaction_unit_t unit; ra_i2c_xunit_init(&unit, (uint8_t *)src, (uint32_t)len, false, (void *)NULL); ra_i2c_xaction_init(&action, (xaction_unit_t *)&unit, 1, (uint32_t)addr, stop); flag = ra_i2c_action_execute(self->i2c_inst, &action, false, DEFAULT_I2C_TIMEOUT); return flag? len:-1; } // MicroPython bindings for machine API static void machine_i2c_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) { machine_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in); mp_printf(print, "I2C(%u, freq=%u, scl=%q, sda=%q)", self->i2c_id, self->freq, self->scl->name, self->sda->name); } static void machine_i2c_init(mp_obj_base_t *obj, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) { mp_raise_NotImplementedError(MP_ERROR_TEXT("init is not supported.")); return; } static mp_obj_t machine_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_freq, ARG_scl, ARG_sda }; static const mp_arg_t allowed_args[] = { { MP_QSTR_id, MP_ARG_REQUIRED | MP_ARG_OBJ }, { MP_QSTR_freq, MP_ARG_INT, {.u_int = DEFAULT_I2C_FREQ} }, { 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_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 static peripheral object bool found = false; int i2c_id = mp_obj_get_int(args[ARG_id].u_obj); machine_i2c_obj_t *self = (machine_i2c_obj_t *)&machine_i2c_obj[0]; for (int i = 0; i < MP_ARRAY_SIZE(machine_i2c_obj); i++) { if (i2c_id == self->i2c_id) { found = true; break; } ++self; } if (found != true) { mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("I2C(%d) doesn't exist"), i2c_id); } // here we would check the scl/sda pins and configure them, but it's not implemented if (args[ARG_scl].u_obj != MP_OBJ_NULL || args[ARG_sda].u_obj != MP_OBJ_NULL) { mp_raise_ValueError(MP_ERROR_TEXT("explicit choice of scl/sda is not implemented")); } if (n_args > 1 || n_kw > 0 || self->freq == 0) { self->freq = args[ARG_freq].u_int; ra_i2c_init(self->i2c_inst, self->scl->pin, self->sda->pin, self->freq); } return MP_OBJ_FROM_PTR(self); } static int machine_i2c_transfer_single(mp_obj_base_t *self_in, uint16_t addr, size_t len, uint8_t *buf, unsigned int flags) { machine_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in); int ret; bool stop; stop = (flags & MP_MACHINE_I2C_FLAG_STOP)? true : false; if (flags & MP_MACHINE_I2C_FLAG_READ) { ret = i2c_read(self, addr, buf, len, stop); } else { ret = i2c_write(self, addr, buf, len, stop); } return ret; } static const mp_machine_i2c_p_t machine_i2c_p = { .init = machine_i2c_init, .transfer = mp_machine_i2c_transfer_adaptor, .transfer_single = machine_i2c_transfer_single, }; MP_DEFINE_CONST_OBJ_TYPE( machine_i2c_type, MP_QSTR_I2C, MP_TYPE_FLAG_NONE, make_new, machine_i2c_make_new, locals_dict, &mp_machine_i2c_locals_dict, print, machine_i2c_print, protocol, &machine_i2c_p ); #endif // MICROPY_PY_MACHINE_I2C