249 lines
8.8 KiB
C
249 lines
8.8 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) 2016-2018 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 <stdio.h>
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#include <string.h>
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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 "i2c.h"
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#include "modmachine.h"
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#if MICROPY_HW_ENABLE_HW_I2C
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#define I2C_POLL_DEFAULT_TIMEOUT_US (50000) // 50ms
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#if defined(STM32F0) || defined(STM32F4) || defined(STM32F7) || defined(STM32H7)
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typedef struct _machine_hard_i2c_obj_t {
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mp_obj_base_t base;
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i2c_t *i2c;
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mp_hal_pin_obj_t scl;
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mp_hal_pin_obj_t sda;
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} machine_hard_i2c_obj_t;
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STATIC const machine_hard_i2c_obj_t machine_hard_i2c_obj[MICROPY_HW_MAX_I2C] = {
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#if defined(MICROPY_HW_I2C1_SCL)
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[0] = {{&machine_hard_i2c_type}, I2C1, MICROPY_HW_I2C1_SCL, MICROPY_HW_I2C1_SDA},
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#endif
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#if defined(MICROPY_HW_I2C2_SCL)
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[1] = {{&machine_hard_i2c_type}, I2C2, MICROPY_HW_I2C2_SCL, MICROPY_HW_I2C2_SDA},
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#endif
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#if defined(MICROPY_HW_I2C3_SCL)
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[2] = {{&machine_hard_i2c_type}, I2C3, MICROPY_HW_I2C3_SCL, MICROPY_HW_I2C3_SDA},
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#endif
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#if defined(MICROPY_HW_I2C4_SCL)
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[3] = {{&machine_hard_i2c_type}, I2C4, MICROPY_HW_I2C4_SCL, MICROPY_HW_I2C4_SDA},
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#endif
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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 = MP_OBJ_TO_PTR(self_in);
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#if defined(STM32F4)
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uint32_t freq = self->i2c->CR2 & 0x3f;
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uint32_t ccr = self->i2c->CCR;
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if (ccr & 0x8000) {
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// Fast mode, assume duty cycle of 16/9
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freq = freq * 40000 / (ccr & 0xfff);
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} else {
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// Standard mode
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freq = freq * 500000 / (ccr & 0xfff);
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}
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mp_printf(print, "I2C(%u, scl=%q, sda=%q, freq=%u)",
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self - &machine_hard_i2c_obj[0] + 1,
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mp_hal_pin_name(self->scl), mp_hal_pin_name(self->sda),
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freq);
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#else
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uint32_t timingr = self->i2c->TIMINGR;
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uint32_t presc = timingr >> 28;
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uint32_t sclh = timingr >> 8 & 0xff;
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uint32_t scll = timingr & 0xff;
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uint32_t freq = HAL_RCC_GetPCLK1Freq() / (presc + 1) / (sclh + scll + 2);
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mp_printf(print, "I2C(%u, scl=%q, sda=%q, freq=%u, timingr=0x%08x)",
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self - &machine_hard_i2c_obj[0] + 1,
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mp_hal_pin_name(self->scl), mp_hal_pin_name(self->sda),
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freq, timingr);
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#endif
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}
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void machine_hard_i2c_init(machine_hard_i2c_obj_t *self, uint32_t freq, uint32_t timeout_us) {
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uint32_t timeout_ms = (timeout_us + 999) / 1000;
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i2c_init(self->i2c, self->scl, self->sda, freq, timeout_ms);
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}
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int machine_hard_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_hard_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
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size_t remain_len = 0;
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for (size_t i = 0; i < n; ++i) {
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remain_len += bufs[i].len;
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}
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int ret = i2c_start_addr(self->i2c, flags & MP_MACHINE_I2C_FLAG_READ, addr, remain_len, flags & MP_MACHINE_I2C_FLAG_STOP);
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if (ret < 0) {
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return ret;
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}
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int num_acks = 0; // only valid for write; for read it'll be 0
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for (; n--; ++bufs) {
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remain_len -= bufs->len;
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if (flags & MP_MACHINE_I2C_FLAG_READ) {
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ret = i2c_read(self->i2c, bufs->buf, bufs->len, remain_len);
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} else {
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ret = i2c_write(self->i2c, bufs->buf, bufs->len, remain_len);
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}
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if (ret < 0) {
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return ret;
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}
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num_acks += ret;
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}
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return num_acks;
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}
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#else
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// No hardware I2C driver for this MCU so use the software implementation
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typedef mp_machine_soft_i2c_obj_t machine_hard_i2c_obj_t;
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STATIC machine_hard_i2c_obj_t machine_hard_i2c_obj[MICROPY_HW_MAX_I2C] = {
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#if defined(MICROPY_HW_I2C1_SCL)
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[0] = {{&machine_hard_i2c_type}, 1, I2C_POLL_DEFAULT_TIMEOUT_US, MICROPY_HW_I2C1_SCL, MICROPY_HW_I2C1_SDA},
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#endif
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#if defined(MICROPY_HW_I2C2_SCL)
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[1] = {{&machine_hard_i2c_type}, 1, I2C_POLL_DEFAULT_TIMEOUT_US, MICROPY_HW_I2C2_SCL, MICROPY_HW_I2C2_SDA},
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#endif
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#if defined(MICROPY_HW_I2C3_SCL)
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[2] = {{&machine_hard_i2c_type}, 1, I2C_POLL_DEFAULT_TIMEOUT_US, MICROPY_HW_I2C3_SCL, MICROPY_HW_I2C3_SDA},
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#endif
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#if defined(MICROPY_HW_I2C4_SCL)
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[3] = {{&machine_hard_i2c_type}, 1, I2C_POLL_DEFAULT_TIMEOUT_US, MICROPY_HW_I2C4_SCL, MICROPY_HW_I2C4_SDA},
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#endif
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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 = MP_OBJ_TO_PTR(self_in);
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mp_printf(print, "I2C(%u, scl=%q, sda=%q, freq=%u, timeout=%u)",
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self - &machine_hard_i2c_obj[0] + 1,
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self->scl->name, self->sda->name, 500000 / self->us_delay, self->us_timeout);
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}
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STATIC void machine_hard_i2c_init(machine_hard_i2c_obj_t *self, uint32_t freq, uint32_t timeout) {
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// set parameters
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if (freq >= 1000000) {
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// allow fastest possible bit-bang rate
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self->us_delay = 0;
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} else {
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self->us_delay = 500000 / freq;
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if (self->us_delay == 0) {
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self->us_delay = 1;
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}
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}
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self->us_timeout = timeout;
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// init pins
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mp_hal_pin_open_drain(self->scl);
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mp_hal_pin_open_drain(self->sda);
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}
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#define machine_hard_i2c_transfer mp_machine_soft_i2c_transfer
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#endif
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/******************************************************************************/
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/* MicroPython bindings for machine API */
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#if defined(STM32F0) || defined(STM32F7) || defined(STM32H7)
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#define MACHINE_I2C_TIMINGR (1)
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#else
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#define MACHINE_I2C_TIMINGR (0)
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#endif
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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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// parse args
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enum { ARG_id, ARG_scl, ARG_sda, ARG_freq, ARG_timeout, ARG_timingr };
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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_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_POLL_DEFAULT_TIMEOUT_US} },
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#if MACHINE_I2C_TIMINGR
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{ MP_QSTR_timingr, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
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#endif
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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 static peripheral object
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int i2c_id = i2c_find_peripheral(args[ARG_id].u_obj);
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machine_hard_i2c_obj_t *self = (machine_hard_i2c_obj_t *)&machine_hard_i2c_obj[i2c_id - 1];
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// here we would check the scl/sda pins and configure them, but it's not implemented
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if (args[ARG_scl].u_obj != MP_OBJ_NULL || args[ARG_sda].u_obj != MP_OBJ_NULL) {
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mp_raise_ValueError(MP_ERROR_TEXT("explicit choice of scl/sda is not implemented"));
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}
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// initialise the I2C peripheral
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machine_hard_i2c_init(self, args[ARG_freq].u_int, args[ARG_timeout].u_int);
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#if MACHINE_I2C_TIMINGR
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// If given, explicitly set the TIMINGR value
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if (args[ARG_timingr].u_obj != mp_const_none) {
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self->i2c->TIMINGR = mp_obj_get_int_truncated(args[ARG_timingr].u_obj);
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}
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#endif
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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_hard_i2c_p = {
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.transfer = machine_hard_i2c_transfer,
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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_HW_ENABLE_HW_I2C
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