246 lines
8.7 KiB
C
246 lines
8.7 KiB
C
/*
|
|
* 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 "py/runtime.h"
|
|
#include "py/mphal.h"
|
|
#include "py/mperrno.h"
|
|
#include "extmod/modmachine.h"
|
|
#include "i2c.h"
|
|
|
|
#if MICROPY_HW_ENABLE_HW_I2C
|
|
|
|
#define I2C_POLL_DEFAULT_TIMEOUT_US (50000) // 50ms
|
|
|
|
#if defined(STM32F0) || defined(STM32F4) || defined(STM32F7) || defined(STM32H7) || defined(STM32L1) || defined(STM32L4)
|
|
|
|
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[MICROPY_HW_MAX_I2C] = {
|
|
#if defined(MICROPY_HW_I2C1_SCL)
|
|
[0] = {{&machine_i2c_type}, I2C1, MICROPY_HW_I2C1_SCL, MICROPY_HW_I2C1_SDA},
|
|
#endif
|
|
#if defined(MICROPY_HW_I2C2_SCL)
|
|
[1] = {{&machine_i2c_type}, I2C2, MICROPY_HW_I2C2_SCL, MICROPY_HW_I2C2_SDA},
|
|
#endif
|
|
#if defined(MICROPY_HW_I2C3_SCL)
|
|
[2] = {{&machine_i2c_type}, I2C3, MICROPY_HW_I2C3_SCL, MICROPY_HW_I2C3_SDA},
|
|
#endif
|
|
#if defined(MICROPY_HW_I2C4_SCL)
|
|
[3] = {{&machine_i2c_type}, I2C4, MICROPY_HW_I2C4_SCL, MICROPY_HW_I2C4_SDA},
|
|
#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) || defined(STM32L1)
|
|
|
|
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_us) {
|
|
uint32_t timeout_ms = (timeout_us + 999) / 1000;
|
|
i2c_init(self->i2c, self->scl, self->sda, freq, timeout_ms);
|
|
}
|
|
|
|
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) {
|
|
machine_hard_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
|
|
|
|
size_t remain_len = 0;
|
|
for (size_t i = 0; i < n; ++i) {
|
|
remain_len += bufs[i].len;
|
|
}
|
|
|
|
int ret = i2c_start_addr(self->i2c, flags & MP_MACHINE_I2C_FLAG_READ, addr, remain_len, flags & MP_MACHINE_I2C_FLAG_STOP);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
int num_acks = 0; // only valid for write; for read it'll be 0
|
|
for (; n--; ++bufs) {
|
|
remain_len -= bufs->len;
|
|
if (flags & MP_MACHINE_I2C_FLAG_READ) {
|
|
ret = i2c_read(self->i2c, bufs->buf, bufs->len, remain_len);
|
|
} else {
|
|
ret = i2c_write(self->i2c, bufs->buf, bufs->len, remain_len);
|
|
}
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
num_acks += ret;
|
|
}
|
|
|
|
return num_acks;
|
|
}
|
|
|
|
#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[MICROPY_HW_MAX_I2C] = {
|
|
#if defined(MICROPY_HW_I2C1_SCL)
|
|
[0] = {{&machine_i2c_type}, 1, I2C_POLL_DEFAULT_TIMEOUT_US, MICROPY_HW_I2C1_SCL, MICROPY_HW_I2C1_SDA},
|
|
#endif
|
|
#if defined(MICROPY_HW_I2C2_SCL)
|
|
[1] = {{&machine_i2c_type}, 1, I2C_POLL_DEFAULT_TIMEOUT_US, MICROPY_HW_I2C2_SCL, MICROPY_HW_I2C2_SDA},
|
|
#endif
|
|
#if defined(MICROPY_HW_I2C3_SCL)
|
|
[2] = {{&machine_i2c_type}, 1, I2C_POLL_DEFAULT_TIMEOUT_US, MICROPY_HW_I2C3_SCL, MICROPY_HW_I2C3_SDA},
|
|
#endif
|
|
#if defined(MICROPY_HW_I2C4_SCL)
|
|
[3] = {{&machine_i2c_type}, 1, I2C_POLL_DEFAULT_TIMEOUT_US, MICROPY_HW_I2C4_SCL, MICROPY_HW_I2C4_SDA},
|
|
#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_transfer mp_machine_soft_i2c_transfer
|
|
|
|
#endif
|
|
|
|
/******************************************************************************/
|
|
/* MicroPython bindings for machine API */
|
|
|
|
#if defined(STM32F0) || defined(STM32F7) || defined(STM32H7) || defined(STM32L4)
|
|
#define MACHINE_I2C_TIMINGR (1)
|
|
#else
|
|
#define MACHINE_I2C_TIMINGR (0)
|
|
#endif
|
|
|
|
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) {
|
|
MP_MACHINE_I2C_CHECK_FOR_LEGACY_SOFTI2C_CONSTRUCTION(n_args, n_kw, all_args);
|
|
|
|
// parse args
|
|
enum { ARG_id, ARG_scl, ARG_sda, ARG_freq, ARG_timeout, ARG_timingr };
|
|
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 = I2C_POLL_DEFAULT_TIMEOUT_US} },
|
|
#if MACHINE_I2C_TIMINGR
|
|
{ MP_QSTR_timingr, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
|
|
#endif
|
|
};
|
|
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);
|
|
|
|
// get static peripheral object
|
|
int i2c_id = i2c_find_peripheral(args[ARG_id].u_obj);
|
|
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(MP_ERROR_TEXT("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);
|
|
|
|
#if MACHINE_I2C_TIMINGR
|
|
// If given, explicitly set the TIMINGR value
|
|
if (args[ARG_timingr].u_obj != mp_const_none) {
|
|
self->i2c->TIMINGR = mp_obj_get_int_truncated(args[ARG_timingr].u_obj);
|
|
}
|
|
#endif
|
|
|
|
return MP_OBJ_FROM_PTR(self);
|
|
}
|
|
|
|
STATIC const mp_machine_i2c_p_t machine_hard_i2c_p = {
|
|
.transfer = machine_hard_i2c_transfer,
|
|
};
|
|
|
|
MP_DEFINE_CONST_OBJ_TYPE(
|
|
machine_i2c_type,
|
|
MP_QSTR_I2C,
|
|
MP_TYPE_FLAG_NONE,
|
|
make_new, machine_hard_i2c_make_new,
|
|
print, machine_hard_i2c_print,
|
|
protocol, &machine_hard_i2c_p,
|
|
locals_dict, &mp_machine_i2c_locals_dict
|
|
);
|
|
|
|
#endif // MICROPY_HW_ENABLE_HW_I2C
|