![Damien George](/assets/img/avatar_default.png)
If MICROPY_PY_MACHINE_I2C_MAKE_NEW is defined then it is called when an I2C object is constructed with an id which is not -1.
641 lines
22 KiB
C
641 lines
22 KiB
C
/*
|
|
* 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"
|
|
|
|
#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, mp_uint_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, size_t n_kw, const mp_obj_t *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, size_t n_kw, const mp_obj_t *all_args);
|
|
return MICROPY_PY_MACHINE_I2C_MAKE_NEW(type, n_args, n_kw, args);
|
|
#else
|
|
mp_raise_ValueError("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;
|
|
mp_map_t kw_args;
|
|
mp_map_init_fixed_table(&kw_args, n_kw, args + n_args);
|
|
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*)self->type->protocol;
|
|
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*)self->type->protocol;
|
|
if (i2c_p->start == NULL) {
|
|
mp_raise_msg(&mp_type_OSError, "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*)self->type->protocol;
|
|
if (i2c_p->stop == NULL) {
|
|
mp_raise_msg(&mp_type_OSError, "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*)self->type->protocol;
|
|
if (i2c_p->read == NULL) {
|
|
mp_raise_msg(&mp_type_OSError, "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*)self->type->protocol;
|
|
if (i2c_p->write == NULL) {
|
|
mp_raise_msg(&mp_type_OSError, "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*)self->type->protocol;
|
|
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*)self->type->protocol;
|
|
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*)self->type->protocol;
|
|
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*)self->type->protocol;
|
|
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*)self->type->protocol;
|
|
|
|
// 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 = {
|
|
.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
|