/* * This file is part of the MicroPython project, http://micropython.org/ * * The MIT License (MIT) * * Copyright (c) 2016-2018 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 #include #include "py/runtime.h" #include "py/mphal.h" #include "py/mperrno.h" #include "extmod/machine_i2c.h" #include "i2c.h" #if MICROPY_HW_ENABLE_HW_I2C STATIC const mp_obj_type_t machine_hard_i2c_type; #if defined(STM32F0) || defined(STM32F4) || defined(STM32F7) typedef struct _machine_hard_i2c_obj_t { mp_obj_base_t base; i2c_t *i2c; mp_hal_pin_obj_t scl; mp_hal_pin_obj_t sda; } machine_hard_i2c_obj_t; STATIC const machine_hard_i2c_obj_t machine_hard_i2c_obj[] = { #if defined(MICROPY_HW_I2C1_SCL) {{&machine_hard_i2c_type}, I2C1, MICROPY_HW_I2C1_SCL, MICROPY_HW_I2C1_SDA}, #else {{NULL}, NULL, NULL, NULL}, #endif #if defined(MICROPY_HW_I2C2_SCL) {{&machine_hard_i2c_type}, I2C2, MICROPY_HW_I2C2_SCL, MICROPY_HW_I2C2_SDA}, #else {{NULL}, NULL, NULL, NULL}, #endif #if defined(MICROPY_HW_I2C3_SCL) {{&machine_hard_i2c_type}, I2C3, MICROPY_HW_I2C3_SCL, MICROPY_HW_I2C3_SDA}, #else {{NULL}, NULL, NULL, NULL}, #endif #if defined(MICROPY_HW_I2C4_SCL) {{&machine_hard_i2c_type}, I2C4, MICROPY_HW_I2C4_SCL, MICROPY_HW_I2C4_SDA}, #else {{NULL}, NULL, NULL, NULL}, #endif }; STATIC void machine_hard_i2c_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) { machine_hard_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in); #if defined(STM32F4) uint32_t freq = self->i2c->CR2 & 0x3f; uint32_t ccr = self->i2c->CCR; if (ccr & 0x8000) { // Fast mode, assume duty cycle of 16/9 freq = freq * 40000 / (ccr & 0xfff); } else { // Standard mode freq = freq * 500000 / (ccr & 0xfff); } mp_printf(print, "I2C(%u, scl=%q, sda=%q, freq=%u)", self - &machine_hard_i2c_obj[0] + 1, mp_hal_pin_name(self->scl), mp_hal_pin_name(self->sda), freq); #else uint32_t timingr = self->i2c->TIMINGR; uint32_t presc = timingr >> 28; uint32_t sclh = timingr >> 8 & 0xff; uint32_t scll = timingr & 0xff; uint32_t freq = HAL_RCC_GetPCLK1Freq() / (presc + 1) / (sclh + scll + 2); mp_printf(print, "I2C(%u, scl=%q, sda=%q, freq=%u, timingr=0x%08x)", self - &machine_hard_i2c_obj[0] + 1, mp_hal_pin_name(self->scl), mp_hal_pin_name(self->sda), freq, timingr); #endif } void machine_hard_i2c_init(machine_hard_i2c_obj_t *self, uint32_t freq, uint32_t timeout) { (void)timeout; i2c_init(self->i2c, self->scl, self->sda, freq); } int machine_hard_i2c_readfrom(mp_obj_base_t *self_in, uint16_t addr, uint8_t *dest, size_t len, bool stop) { machine_hard_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in); return i2c_readfrom(self->i2c, addr, dest, len, stop); } int machine_hard_i2c_writeto(mp_obj_base_t *self_in, uint16_t addr, const uint8_t *src, size_t len, bool stop) { machine_hard_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in); return i2c_writeto(self->i2c, addr, src, len, stop); } #else // No hardware I2C driver for this MCU so use the software implementation typedef mp_machine_soft_i2c_obj_t machine_hard_i2c_obj_t; STATIC machine_hard_i2c_obj_t machine_hard_i2c_obj[] = { #if defined(MICROPY_HW_I2C1_SCL) {{&machine_hard_i2c_type}, 1, 500, MICROPY_HW_I2C1_SCL, MICROPY_HW_I2C1_SDA}, #else {{NULL}, 0, 0, NULL, NULL}, #endif #if defined(MICROPY_HW_I2C2_SCL) {{&machine_hard_i2c_type}, 1, 500, MICROPY_HW_I2C2_SCL, MICROPY_HW_I2C2_SDA}, #else {{NULL}, 0, 0, NULL, NULL}, #endif #if defined(MICROPY_HW_I2C3_SCL) {{&machine_hard_i2c_type}, 1, 500, MICROPY_HW_I2C3_SCL, MICROPY_HW_I2C3_SDA}, #else {{NULL}, 0, 0, NULL, NULL}, #endif #if defined(MICROPY_HW_I2C4_SCL) {{&machine_hard_i2c_type}, 1, 500, MICROPY_HW_I2C4_SCL, MICROPY_HW_I2C4_SDA}, #else {{NULL}, 0, 0, NULL, NULL}, #endif }; STATIC void machine_hard_i2c_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) { machine_hard_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in); mp_printf(print, "I2C(%u, scl=%q, sda=%q, freq=%u, timeout=%u)", self - &machine_hard_i2c_obj[0] + 1, self->scl->name, self->sda->name, 500000 / self->us_delay, self->us_timeout); } STATIC void machine_hard_i2c_init(machine_hard_i2c_obj_t *self, uint32_t freq, uint32_t timeout) { // set parameters if (freq >= 1000000) { // allow fastest possible bit-bang rate self->us_delay = 0; } else { self->us_delay = 500000 / freq; if (self->us_delay == 0) { self->us_delay = 1; } } self->us_timeout = timeout; // init pins mp_hal_pin_open_drain(self->scl); mp_hal_pin_open_drain(self->sda); } #define machine_hard_i2c_readfrom mp_machine_soft_i2c_readfrom #define machine_hard_i2c_writeto mp_machine_soft_i2c_writeto #endif /******************************************************************************/ /* MicroPython bindings for machine API */ 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) { // 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 = 1000} }, }; 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); // work out i2c bus int i2c_id = 0; if (mp_obj_is_str(args[ARG_id].u_obj)) { const char *port = mp_obj_str_get_str(args[ARG_id].u_obj); if (0) { #ifdef MICROPY_HW_I2C1_NAME } else if (strcmp(port, MICROPY_HW_I2C1_NAME) == 0) { i2c_id = 1; #endif #ifdef MICROPY_HW_I2C2_NAME } else if (strcmp(port, MICROPY_HW_I2C2_NAME) == 0) { i2c_id = 2; #endif #ifdef MICROPY_HW_I2C3_NAME } else if (strcmp(port, MICROPY_HW_I2C3_NAME) == 0) { i2c_id = 3; #endif } else { nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "I2C(%s) doesn't exist", port)); } } else { i2c_id = mp_obj_get_int(args[ARG_id].u_obj); if (i2c_id < 1 || i2c_id > MP_ARRAY_SIZE(machine_hard_i2c_obj) || machine_hard_i2c_obj[i2c_id - 1].base.type == NULL) { nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "I2C(%d) doesn't exist", i2c_id)); } } // get static peripheral object machine_hard_i2c_obj_t *self = (machine_hard_i2c_obj_t*)&machine_hard_i2c_obj[i2c_id - 1]; // 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("explicit choice of scl/sda is not implemented"); } // initialise the I2C peripheral machine_hard_i2c_init(self, args[ARG_freq].u_int, args[ARG_timeout].u_int); return MP_OBJ_FROM_PTR(self); } STATIC const mp_machine_i2c_p_t machine_hard_i2c_p = { .readfrom = machine_hard_i2c_readfrom, .writeto = machine_hard_i2c_writeto, }; STATIC const mp_obj_type_t machine_hard_i2c_type = { { &mp_type_type }, .name = MP_QSTR_I2C, .print = machine_hard_i2c_print, .make_new = machine_hard_i2c_make_new, .protocol = &machine_hard_i2c_p, .locals_dict = (mp_obj_dict_t*)&mp_machine_soft_i2c_locals_dict, }; #endif // MICROPY_HW_ENABLE_HW_I2C