diff options
Diffstat (limited to 'extmod/machine_i2c.c')
| -rw-r--r-- | extmod/machine_i2c.c | 641 |
1 files changed, 0 insertions, 641 deletions
diff --git a/extmod/machine_i2c.c b/extmod/machine_i2c.c deleted file mode 100644 index 4129ace0a..000000000 --- a/extmod/machine_i2c.c +++ /dev/null @@ -1,641 +0,0 @@ -/* - * This file is part of the MicroPython project, http://micropython.org/ - * - * The MIT License (MIT) - * - * Copyright (c) 2016 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 <stdio.h> -#include <stdint.h> -#include <string.h> - -#include "py/mperrno.h" -#include "py/mphal.h" -#include "py/runtime.h" -#include "extmod/machine_i2c.h" - -#include "supervisor/shared/translate.h" - -#if MICROPY_PY_MACHINE_I2C - -typedef mp_machine_soft_i2c_obj_t machine_i2c_obj_t; - -STATIC void mp_hal_i2c_delay(machine_i2c_obj_t *self) { - // We need to use an accurate delay to get acceptable I2C - // speeds (eg 1us should be not much more than 1us). - mp_hal_delay_us_fast(self->us_delay); -} - -STATIC void mp_hal_i2c_scl_low(machine_i2c_obj_t *self) { - mp_hal_pin_od_low(self->scl); -} - -STATIC int mp_hal_i2c_scl_release(machine_i2c_obj_t *self) { - uint32_t count = self->us_timeout; - - mp_hal_pin_od_high(self->scl); - mp_hal_i2c_delay(self); - // For clock stretching, wait for the SCL pin to be released, with timeout. - for (; mp_hal_pin_read(self->scl) == 0 && count; --count) { - mp_hal_delay_us_fast(1); - } - if (count == 0) { - return -MP_ETIMEDOUT; - } - return 0; // success -} - -STATIC void mp_hal_i2c_sda_low(machine_i2c_obj_t *self) { - mp_hal_pin_od_low(self->sda); -} - -STATIC void mp_hal_i2c_sda_release(machine_i2c_obj_t *self) { - mp_hal_pin_od_high(self->sda); -} - -STATIC int mp_hal_i2c_sda_read(machine_i2c_obj_t *self) { - return mp_hal_pin_read(self->sda); -} - -STATIC int mp_hal_i2c_start(machine_i2c_obj_t *self) { - mp_hal_i2c_sda_release(self); - mp_hal_i2c_delay(self); - int ret = mp_hal_i2c_scl_release(self); - if (ret != 0) { - return ret; - } - mp_hal_i2c_sda_low(self); - mp_hal_i2c_delay(self); - return 0; // success -} - -STATIC int mp_hal_i2c_stop(machine_i2c_obj_t *self) { - mp_hal_i2c_delay(self); - mp_hal_i2c_sda_low(self); - mp_hal_i2c_delay(self); - int ret = mp_hal_i2c_scl_release(self); - mp_hal_i2c_sda_release(self); - mp_hal_i2c_delay(self); - return ret; -} - -STATIC void mp_hal_i2c_init(machine_i2c_obj_t *self, uint32_t freq) { - self->us_delay = 500000 / freq; - if (self->us_delay == 0) { - self->us_delay = 1; - } - mp_hal_pin_open_drain(self->scl); - mp_hal_pin_open_drain(self->sda); - mp_hal_i2c_stop(self); // ignore error -} - -// return value: -// 0 - byte written and ack received -// 1 - byte written and nack received -// <0 - error, with errno being the negative of the return value -STATIC int mp_hal_i2c_write_byte(machine_i2c_obj_t *self, uint8_t val) { - mp_hal_i2c_delay(self); - mp_hal_i2c_scl_low(self); - - for (int i = 7; i >= 0; i--) { - if ((val >> i) & 1) { - mp_hal_i2c_sda_release(self); - } else { - mp_hal_i2c_sda_low(self); - } - mp_hal_i2c_delay(self); - int ret = mp_hal_i2c_scl_release(self); - if (ret != 0) { - mp_hal_i2c_sda_release(self); - return ret; - } - mp_hal_i2c_scl_low(self); - } - - mp_hal_i2c_sda_release(self); - mp_hal_i2c_delay(self); - int ret = mp_hal_i2c_scl_release(self); - if (ret != 0) { - return ret; - } - - int ack = mp_hal_i2c_sda_read(self); - mp_hal_i2c_delay(self); - mp_hal_i2c_scl_low(self); - - return ack; -} - -// return value: -// 0 - success -// <0 - error, with errno being the negative of the return value -STATIC int mp_hal_i2c_read_byte(machine_i2c_obj_t *self, uint8_t *val, int nack) { - mp_hal_i2c_delay(self); - mp_hal_i2c_scl_low(self); - mp_hal_i2c_delay(self); - - uint8_t data = 0; - for (int i = 7; i >= 0; i--) { - int ret = mp_hal_i2c_scl_release(self); - if (ret != 0) { - return ret; - } - data = (data << 1) | mp_hal_i2c_sda_read(self); - mp_hal_i2c_scl_low(self); - mp_hal_i2c_delay(self); - } - *val = data; - - // send ack/nack bit - if (!nack) { - mp_hal_i2c_sda_low(self); - } - mp_hal_i2c_delay(self); - int ret = mp_hal_i2c_scl_release(self); - if (ret != 0) { - mp_hal_i2c_sda_release(self); - return ret; - } - mp_hal_i2c_scl_low(self); - mp_hal_i2c_sda_release(self); - - return 0; // success -} - -// return value: -// >=0 - number of acks received -// <0 - error, with errno being the negative of the return value -int mp_machine_soft_i2c_writeto(mp_obj_base_t *self_in, uint16_t addr, const uint8_t *src, size_t len, bool stop) { - machine_i2c_obj_t *self = (machine_i2c_obj_t*)self_in; - - // start the I2C transaction - int ret = mp_hal_i2c_start(self); - if (ret != 0) { - return ret; - } - - // write the slave address - ret = mp_hal_i2c_write_byte(self, addr << 1); - if (ret < 0) { - return ret; - } else if (ret != 0) { - // nack received, release the bus cleanly - mp_hal_i2c_stop(self); - return -MP_ENODEV; - } - - // write the buffer to the I2C memory - int num_acks = 0; - while (len--) { - ret = mp_hal_i2c_write_byte(self, *src++); - if (ret < 0) { - return ret; - } else if (ret != 0) { - // nack received, stop sending - break; - } - ++num_acks; - } - - // finish the I2C transaction - if (stop) { - ret = mp_hal_i2c_stop(self); - if (ret != 0) { - return ret; - } - } - - return num_acks; -} - -// return value: -// 0 - success -// <0 - error, with errno being the negative of the return value -int mp_machine_soft_i2c_readfrom(mp_obj_base_t *self_in, uint16_t addr, uint8_t *dest, size_t len, bool stop) { - machine_i2c_obj_t *self = (machine_i2c_obj_t*)self_in; - - // start the I2C transaction - int ret = mp_hal_i2c_start(self); - if (ret != 0) { - return ret; - } - - // write the slave address - ret = mp_hal_i2c_write_byte(self, (addr << 1) | 1); - if (ret < 0) { - return ret; - } else if (ret != 0) { - // nack received, release the bus cleanly - mp_hal_i2c_stop(self); - return -MP_ENODEV; - } - - // read the bytes from the slave - while (len--) { - ret = mp_hal_i2c_read_byte(self, dest++, len == 0); - if (ret != 0) { - return ret; - } - } - - // finish the I2C transaction - if (stop) { - ret = mp_hal_i2c_stop(self); - if (ret != 0) { - return ret; - } - } - - return 0; // success -} - -/******************************************************************************/ -// MicroPython bindings for I2C - -STATIC void machine_i2c_obj_init_helper(machine_i2c_obj_t *self, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) { - enum { ARG_scl, ARG_sda, ARG_freq, ARG_timeout }; - static const mp_arg_t allowed_args[] = { - { MP_QSTR_scl, MP_ARG_REQUIRED | MP_ARG_OBJ }, - { MP_QSTR_sda, MP_ARG_REQUIRED | MP_ARG_OBJ }, - { 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 = 255} }, - }; - mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)]; - mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args); - self->scl = mp_hal_get_pin_obj(args[ARG_scl].u_obj); - self->sda = mp_hal_get_pin_obj(args[ARG_sda].u_obj); - self->us_timeout = args[ARG_timeout].u_int; - mp_hal_i2c_init(self, args[ARG_freq].u_int); -} - -STATIC mp_obj_t machine_i2c_make_new(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *args, mp_map_t *kw_args) { - // check the id argument, if given - if (n_args > 0) { - if (args[0] != MP_OBJ_NEW_SMALL_INT(-1)) { - #if defined(MICROPY_PY_MACHINE_I2C_MAKE_NEW) - // dispatch to port-specific constructor - extern mp_obj_t MICROPY_PY_MACHINE_I2C_MAKE_NEW(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *all_args, mp_map_t *kw_args); - return MICROPY_PY_MACHINE_I2C_MAKE_NEW(type, n_args, args, kw_args); - #else - mp_raise_ValueError(translate("invalid I2C peripheral")); - #endif - } - --n_args; - ++args; - } - - // create new soft I2C object - machine_i2c_obj_t *self = m_new_obj(machine_i2c_obj_t); - self->base.type = &machine_i2c_type; - machine_i2c_obj_init_helper(self, n_args, args, kw_args); - return (mp_obj_t)self; -} - -STATIC mp_obj_t machine_i2c_obj_init(size_t n_args, const mp_obj_t *args, mp_map_t *kw_args) { - machine_i2c_obj_init_helper(args[0], n_args - 1, args + 1, kw_args); - return mp_const_none; -} -MP_DEFINE_CONST_FUN_OBJ_KW(machine_i2c_init_obj, 1, machine_i2c_obj_init); - -STATIC mp_obj_t machine_i2c_scan(mp_obj_t self_in) { - mp_obj_base_t *self = MP_OBJ_TO_PTR(self_in); - mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t*)mp_proto_get(self, QSTR_protocol_i2c); - mp_obj_t list = mp_obj_new_list(0, NULL); - // 7-bit addresses 0b0000xxx and 0b1111xxx are reserved - for (int addr = 0x08; addr < 0x78; ++addr) { - int ret = i2c_p->writeto(self, addr, NULL, 0, true); - if (ret == 0) { - mp_obj_list_append(list, MP_OBJ_NEW_SMALL_INT(addr)); - } - } - return list; -} -MP_DEFINE_CONST_FUN_OBJ_1(machine_i2c_scan_obj, machine_i2c_scan); - -STATIC mp_obj_t machine_i2c_start(mp_obj_t self_in) { - mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(self_in); - mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t*)mp_proto_get(self, QSTR_protocol_i2c); - if (i2c_p->start == NULL) { - mp_raise_msg(&mp_type_OSError, translate("I2C operation not supported")); - } - int ret = i2c_p->start(self); - if (ret != 0) { - mp_raise_OSError(-ret); - } - return mp_const_none; -} -MP_DEFINE_CONST_FUN_OBJ_1(machine_i2c_start_obj, machine_i2c_start); - -STATIC mp_obj_t machine_i2c_stop(mp_obj_t self_in) { - mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(self_in); - mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t*)mp_proto_get(self, QSTR_protocol_i2c); - if (i2c_p->stop == NULL) { - mp_raise_msg(&mp_type_OSError, translate("I2C operation not supported")); - } - int ret = i2c_p->stop(self); - if (ret != 0) { - mp_raise_OSError(-ret); - } - return mp_const_none; -} -MP_DEFINE_CONST_FUN_OBJ_1(machine_i2c_stop_obj, machine_i2c_stop); - -STATIC mp_obj_t machine_i2c_readinto(size_t n_args, const mp_obj_t *args) { - mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(args[0]); - mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t*)mp_proto_get(self, QSTR_protocol_i2c); - if (i2c_p->read == NULL) { - mp_raise_msg(&mp_type_OSError, translate("I2C operation not supported")); - } - - // get the buffer to read into - mp_buffer_info_t bufinfo; - mp_get_buffer_raise(args[1], &bufinfo, MP_BUFFER_WRITE); - - // work out if we want to send a nack at the end - bool nack = (n_args == 2) ? true : mp_obj_is_true(args[2]); - - // do the read - int ret = i2c_p->read(self, bufinfo.buf, bufinfo.len, nack); - if (ret != 0) { - mp_raise_OSError(-ret); - } - - return mp_const_none; -} -MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_i2c_readinto_obj, 2, 3, machine_i2c_readinto); - -STATIC mp_obj_t machine_i2c_write(mp_obj_t self_in, mp_obj_t buf_in) { - mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(self_in); - mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t*)mp_proto_get(self, QSTR_protocol_i2c); - if (i2c_p->write == NULL) { - mp_raise_msg(&mp_type_OSError, translate("I2C operation not supported")); - } - - // get the buffer to write from - mp_buffer_info_t bufinfo; - mp_get_buffer_raise(buf_in, &bufinfo, MP_BUFFER_READ); - - // do the write - int ret = i2c_p->write(self, bufinfo.buf, bufinfo.len); - if (ret < 0) { - mp_raise_OSError(-ret); - } - - // return number of acks received - return MP_OBJ_NEW_SMALL_INT(ret); -} -MP_DEFINE_CONST_FUN_OBJ_2(machine_i2c_write_obj, machine_i2c_write); - -STATIC mp_obj_t machine_i2c_readfrom(size_t n_args, const mp_obj_t *args) { - mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(args[0]); - mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t*)mp_proto_get(self, QSTR_protocol_i2c); - mp_int_t addr = mp_obj_get_int(args[1]); - vstr_t vstr; - vstr_init_len(&vstr, mp_obj_get_int(args[2])); - bool stop = (n_args == 3) ? true : mp_obj_is_true(args[3]); - int ret = i2c_p->readfrom(self, addr, (uint8_t*)vstr.buf, vstr.len, stop); - if (ret < 0) { - mp_raise_OSError(-ret); - } - return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr); -} -MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_i2c_readfrom_obj, 3, 4, machine_i2c_readfrom); - -STATIC mp_obj_t machine_i2c_readfrom_into(size_t n_args, const mp_obj_t *args) { - mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(args[0]); - mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t*)mp_proto_get(self, QSTR_protocol_i2c); - mp_int_t addr = mp_obj_get_int(args[1]); - mp_buffer_info_t bufinfo; - mp_get_buffer_raise(args[2], &bufinfo, MP_BUFFER_WRITE); - bool stop = (n_args == 3) ? true : mp_obj_is_true(args[3]); - int ret = i2c_p->readfrom(self, addr, bufinfo.buf, bufinfo.len, stop); - if (ret < 0) { - mp_raise_OSError(-ret); - } - return mp_const_none; -} -MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_i2c_readfrom_into_obj, 3, 4, machine_i2c_readfrom_into); - -STATIC mp_obj_t machine_i2c_writeto(size_t n_args, const mp_obj_t *args) { - mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(args[0]); - mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t*)mp_proto_get(self, QSTR_protocol_i2c); - mp_int_t addr = mp_obj_get_int(args[1]); - mp_buffer_info_t bufinfo; - mp_get_buffer_raise(args[2], &bufinfo, MP_BUFFER_READ); - bool stop = (n_args == 3) ? true : mp_obj_is_true(args[3]); - int ret = i2c_p->writeto(self, addr, bufinfo.buf, bufinfo.len, stop); - if (ret < 0) { - mp_raise_OSError(-ret); - } - // return number of acks received - return MP_OBJ_NEW_SMALL_INT(ret); -} -STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_i2c_writeto_obj, 3, 4, machine_i2c_writeto); - -STATIC int read_mem(mp_obj_t self_in, uint16_t addr, uint32_t memaddr, uint8_t addrsize, uint8_t *buf, size_t len) { - mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(self_in); - mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t*)mp_proto_get(self, QSTR_protocol_i2c); - uint8_t memaddr_buf[4]; - size_t memaddr_len = 0; - for (int16_t i = addrsize - 8; i >= 0; i -= 8) { - memaddr_buf[memaddr_len++] = memaddr >> i; - } - int ret = i2c_p->writeto(self, addr, memaddr_buf, memaddr_len, false); - if (ret != memaddr_len) { - // must generate STOP - i2c_p->writeto(self, addr, NULL, 0, true); - return ret; - } - return i2c_p->readfrom(self, addr, buf, len, true); -} - -#define MAX_MEMADDR_SIZE (4) -#define BUF_STACK_SIZE (12) - -STATIC int write_mem(mp_obj_t self_in, uint16_t addr, uint32_t memaddr, uint8_t addrsize, const uint8_t *buf, size_t len) { - mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(self_in); - mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t*)mp_proto_get(self, QSTR_protocol_i2c); - - // need some memory to create the buffer to send; try to use stack if possible - uint8_t buf2_stack[MAX_MEMADDR_SIZE + BUF_STACK_SIZE]; - uint8_t *buf2; - size_t buf2_alloc = 0; - if (len <= BUF_STACK_SIZE) { - buf2 = buf2_stack; - } else { - buf2_alloc = MAX_MEMADDR_SIZE + len; - buf2 = m_new(uint8_t, buf2_alloc); - } - - // create the buffer to send - size_t memaddr_len = 0; - for (int16_t i = addrsize - 8; i >= 0; i -= 8) { - buf2[memaddr_len++] = memaddr >> i; - } - memcpy(buf2 + memaddr_len, buf, len); - - int ret = i2c_p->writeto(self, addr, buf2, memaddr_len + len, true); - if (buf2_alloc != 0) { - m_del(uint8_t, buf2, buf2_alloc); - } - return ret; -} - -STATIC const mp_arg_t machine_i2c_mem_allowed_args[] = { - { MP_QSTR_addr, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 0} }, - { MP_QSTR_memaddr, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 0} }, - { MP_QSTR_arg, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} }, - { MP_QSTR_addrsize, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 8} }, -}; - -STATIC mp_obj_t machine_i2c_readfrom_mem(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) { - enum { ARG_addr, ARG_memaddr, ARG_n, ARG_addrsize }; - mp_arg_val_t args[MP_ARRAY_SIZE(machine_i2c_mem_allowed_args)]; - mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, - MP_ARRAY_SIZE(machine_i2c_mem_allowed_args), machine_i2c_mem_allowed_args, args); - - // create the buffer to store data into - vstr_t vstr; - vstr_init_len(&vstr, mp_obj_get_int(args[ARG_n].u_obj)); - - // do the transfer - int ret = read_mem(pos_args[0], args[ARG_addr].u_int, args[ARG_memaddr].u_int, - args[ARG_addrsize].u_int, (uint8_t*)vstr.buf, vstr.len); - if (ret < 0) { - mp_raise_OSError(-ret); - } - - return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr); -} -MP_DEFINE_CONST_FUN_OBJ_KW(machine_i2c_readfrom_mem_obj, 1, machine_i2c_readfrom_mem); - - -STATIC mp_obj_t machine_i2c_readfrom_mem_into(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) { - enum { ARG_addr, ARG_memaddr, ARG_buf, ARG_addrsize }; - mp_arg_val_t args[MP_ARRAY_SIZE(machine_i2c_mem_allowed_args)]; - mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, - MP_ARRAY_SIZE(machine_i2c_mem_allowed_args), machine_i2c_mem_allowed_args, args); - - // get the buffer to store data into - mp_buffer_info_t bufinfo; - mp_get_buffer_raise(args[ARG_buf].u_obj, &bufinfo, MP_BUFFER_WRITE); - - // do the transfer - int ret = read_mem(pos_args[0], args[ARG_addr].u_int, args[ARG_memaddr].u_int, - args[ARG_addrsize].u_int, bufinfo.buf, bufinfo.len); - if (ret < 0) { - mp_raise_OSError(-ret); - } - return mp_const_none; -} -MP_DEFINE_CONST_FUN_OBJ_KW(machine_i2c_readfrom_mem_into_obj, 1, machine_i2c_readfrom_mem_into); - -STATIC mp_obj_t machine_i2c_writeto_mem(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) { - enum { ARG_addr, ARG_memaddr, ARG_buf, ARG_addrsize }; - mp_arg_val_t args[MP_ARRAY_SIZE(machine_i2c_mem_allowed_args)]; - mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, - MP_ARRAY_SIZE(machine_i2c_mem_allowed_args), machine_i2c_mem_allowed_args, args); - - // get the buffer to write the data from - mp_buffer_info_t bufinfo; - mp_get_buffer_raise(args[ARG_buf].u_obj, &bufinfo, MP_BUFFER_READ); - - // do the transfer - int ret = write_mem(pos_args[0], args[ARG_addr].u_int, args[ARG_memaddr].u_int, - args[ARG_addrsize].u_int, bufinfo.buf, bufinfo.len); - if (ret < 0) { - mp_raise_OSError(-ret); - } - - return mp_const_none; -} -STATIC MP_DEFINE_CONST_FUN_OBJ_KW(machine_i2c_writeto_mem_obj, 1, machine_i2c_writeto_mem); - -STATIC const mp_rom_map_elem_t machine_i2c_locals_dict_table[] = { - { MP_ROM_QSTR(MP_QSTR_init), MP_ROM_PTR(&machine_i2c_init_obj) }, - { MP_ROM_QSTR(MP_QSTR_scan), MP_ROM_PTR(&machine_i2c_scan_obj) }, - - // primitive I2C operations - { MP_ROM_QSTR(MP_QSTR_start), MP_ROM_PTR(&machine_i2c_start_obj) }, - { MP_ROM_QSTR(MP_QSTR_stop), MP_ROM_PTR(&machine_i2c_stop_obj) }, - { MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&machine_i2c_readinto_obj) }, - { MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&machine_i2c_write_obj) }, - - // standard bus operations - { MP_ROM_QSTR(MP_QSTR_readfrom), MP_ROM_PTR(&machine_i2c_readfrom_obj) }, - { MP_ROM_QSTR(MP_QSTR_readfrom_into), MP_ROM_PTR(&machine_i2c_readfrom_into_obj) }, - { MP_ROM_QSTR(MP_QSTR_writeto), MP_ROM_PTR(&machine_i2c_writeto_obj) }, - - // memory operations - { MP_ROM_QSTR(MP_QSTR_readfrom_mem), MP_ROM_PTR(&machine_i2c_readfrom_mem_obj) }, - { MP_ROM_QSTR(MP_QSTR_readfrom_mem_into), MP_ROM_PTR(&machine_i2c_readfrom_mem_into_obj) }, - { MP_ROM_QSTR(MP_QSTR_writeto_mem), MP_ROM_PTR(&machine_i2c_writeto_mem_obj) }, -}; - -MP_DEFINE_CONST_DICT(mp_machine_soft_i2c_locals_dict, machine_i2c_locals_dict_table); - -int mp_machine_soft_i2c_read(mp_obj_base_t *self_in, uint8_t *dest, size_t len, bool nack) { - machine_i2c_obj_t *self = (machine_i2c_obj_t*)self_in; - while (len--) { - int ret = mp_hal_i2c_read_byte(self, dest++, nack && (len == 0)); - if (ret != 0) { - return ret; - } - } - return 0; // success -} - -int mp_machine_soft_i2c_write(mp_obj_base_t *self_in, const uint8_t *src, size_t len) { - machine_i2c_obj_t *self = (machine_i2c_obj_t*)self_in; - int num_acks = 0; - while (len--) { - int ret = mp_hal_i2c_write_byte(self, *src++); - if (ret < 0) { - return ret; - } else if (ret != 0) { - // nack received, stop sending - break; - } - ++num_acks; - } - return num_acks; -} - -STATIC const mp_machine_i2c_p_t mp_machine_soft_i2c_p = { - MP_PROTO_IMPLEMENT(MP_QSTR_protocol_i2c) - .start = (int(*)(mp_obj_base_t*))mp_hal_i2c_start, - .stop = (int(*)(mp_obj_base_t*))mp_hal_i2c_stop, - .read = mp_machine_soft_i2c_read, - .write = mp_machine_soft_i2c_write, - .readfrom = mp_machine_soft_i2c_readfrom, - .writeto = mp_machine_soft_i2c_writeto, -}; - -const mp_obj_type_t machine_i2c_type = { - { &mp_type_type }, - .name = MP_QSTR_I2C, - .make_new = machine_i2c_make_new, - .protocol = &mp_machine_soft_i2c_p, - .locals_dict = (mp_obj_dict_t*)&mp_machine_soft_i2c_locals_dict, -}; - -#endif // MICROPY_PY_MACHINE_I2C |