174 lines
5.6 KiB
C
174 lines
5.6 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) 2017 Glenn Ruben Bakke
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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 <stdio.h>
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#include <string.h>
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#include "py/nlr.h"
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#include "py/runtime.h"
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#include "py/mperrno.h"
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#include "py/mphal.h"
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#if MICROPY_PY_MACHINE_I2C
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#include "extmod/machine_i2c.h"
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#include "i2c.h"
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#if NRFX_TWI_ENABLED
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#include "nrfx_twi.h"
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#else
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#include "nrfx_twim.h"
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#endif
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#if NRFX_TWIM_ENABLED
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#define nrfx_twi_t nrfx_twim_t
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#define nrfx_twi_config_t nrfx_twim_config_t
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#define nrfx_twi_init nrfx_twim_init
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#define nrfx_twi_enable nrfx_twim_enable
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#define nrfx_twi_xfer nrfx_twim_xfer
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#define nrfx_twi_disable nrfx_twim_disable
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#define nrfx_twi_xfer_desc_t nrfx_twim_xfer_desc_t
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#define NRFX_TWI_XFER_DESC_RX NRFX_TWIM_XFER_DESC_RX
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#define NRFX_TWI_XFER_DESC_TX NRFX_TWIM_XFER_DESC_TX
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#define NRFX_TWI_INSTANCE NRFX_TWIM_INSTANCE
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#define NRF_TWI_FREQ_400K NRF_TWIM_FREQ_400K
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#endif
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typedef struct _machine_hard_i2c_obj_t {
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mp_obj_base_t base;
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nrfx_twi_t p_twi; // Driver instance
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} machine_hard_i2c_obj_t;
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STATIC const machine_hard_i2c_obj_t machine_hard_i2c_obj[] = {
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{{&machine_hard_i2c_type}, .p_twi = NRFX_TWI_INSTANCE(0)},
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{{&machine_hard_i2c_type}, .p_twi = NRFX_TWI_INSTANCE(1)},
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};
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void i2c_init0(void) {
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}
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STATIC int i2c_find(mp_obj_t id) {
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// given an integer id
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int i2c_id = mp_obj_get_int(id);
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if (i2c_id >= 0 && i2c_id < MP_ARRAY_SIZE(machine_hard_i2c_obj)) {
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return i2c_id;
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}
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mp_raise_ValueError(MP_ERROR_TEXT("I2C doesn't exist"));
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}
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STATIC void machine_hard_i2c_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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machine_hard_i2c_obj_t *self = self_in;
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mp_printf(print, "I2C(%u)", self->p_twi.drv_inst_idx);
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}
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/******************************************************************************/
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/* MicroPython bindings for machine API */
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mp_obj_t machine_hard_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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enum { ARG_id, ARG_scl, ARG_sda };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_id, MP_ARG_REQUIRED | MP_ARG_OBJ },
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{ MP_QSTR_scl, MP_ARG_REQUIRED | MP_ARG_OBJ },
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{ MP_QSTR_sda, MP_ARG_REQUIRED | MP_ARG_OBJ },
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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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// get static peripheral object
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int i2c_id = i2c_find(args[ARG_id].u_obj);
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const machine_hard_i2c_obj_t *self = &machine_hard_i2c_obj[i2c_id];
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nrfx_twi_config_t config;
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config.scl = mp_hal_get_pin_obj(args[ARG_scl].u_obj)->pin;
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config.sda = mp_hal_get_pin_obj(args[ARG_sda].u_obj)->pin;
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config.frequency = NRF_TWI_FREQ_400K;
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config.hold_bus_uninit = false;
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// Set context to this object.
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nrfx_twi_init(&self->p_twi, &config, NULL, (void *)self);
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return MP_OBJ_FROM_PTR(self);
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}
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int machine_hard_i2c_transfer_single(mp_obj_base_t *self_in, uint16_t addr, size_t len, uint8_t *buf, unsigned int flags) {
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machine_hard_i2c_obj_t *self = (machine_hard_i2c_obj_t *)self_in;
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nrfx_twi_enable(&self->p_twi);
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nrfx_err_t err_code;
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int transfer_ret = 0;
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if (flags & MP_MACHINE_I2C_FLAG_READ) {
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nrfx_twi_xfer_desc_t desc = NRFX_TWI_XFER_DESC_RX(addr, buf, len);
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err_code = nrfx_twi_xfer(&self->p_twi, &desc, 0);
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} else {
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nrfx_twi_xfer_desc_t desc = NRFX_TWI_XFER_DESC_TX(addr, buf, len);
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err_code = nrfx_twi_xfer(&self->p_twi, &desc, (flags & MP_MACHINE_I2C_FLAG_STOP) == 0);
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transfer_ret = len;
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}
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if (err_code != NRFX_SUCCESS) {
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if (err_code == NRFX_ERROR_DRV_TWI_ERR_ANACK) {
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return -MP_ENODEV;
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}
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else if (err_code == NRFX_ERROR_DRV_TWI_ERR_DNACK) {
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return -MP_EIO;
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}
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return -MP_ETIMEDOUT;
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}
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nrfx_twi_disable(&self->p_twi);
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return transfer_ret;
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}
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STATIC const mp_machine_i2c_p_t machine_hard_i2c_p = {
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.transfer = mp_machine_i2c_transfer_adaptor,
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.transfer_single = machine_hard_i2c_transfer_single,
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};
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const mp_obj_type_t machine_hard_i2c_type = {
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{ &mp_type_type },
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.name = MP_QSTR_I2C,
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.print = machine_hard_i2c_print,
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.make_new = machine_hard_i2c_make_new,
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.protocol = &machine_hard_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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#endif // MICROPY_PY_MACHINE_I2C
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