circuitpython/nrf5/i2c.c

161 lines
5.3 KiB
C

/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2017 Glenn Ruben Bakke
*
* 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 <string.h>
#include "py/nlr.h"
#include "py/runtime.h"
#include "py/mphal.h"
#include "extmod/machine_i2c.h"
#include "i2c.h"
#include "hal_twi.h"
#if MICROPY_PY_MACHINE_I2C
STATIC const mp_obj_type_t machine_hard_i2c_type;
typedef struct _machine_hard_i2c_obj_t {
mp_obj_base_t base;
TWI_HandleTypeDef *i2c;
} machine_hard_i2c_obj_t;
TWI_HandleTypeDef I2CHandle0 = {.instance = NULL, .init.id = 0};
TWI_HandleTypeDef I2CHandle1 = {.instance = NULL, .init.id = 1};
STATIC const machine_hard_i2c_obj_t machine_hard_i2c_obj[] = {
{{&machine_hard_i2c_type}, &I2CHandle0},
{{&machine_hard_i2c_type}, &I2CHandle1},
};
void i2c_init0(void) {
// reset the I2C handles
memset(&I2CHandle0, 0, sizeof(TWI_HandleTypeDef));
I2CHandle0.instance = TWI_BASE(0);
memset(&I2CHandle1, 0, sizeof(TWI_HandleTypeDef));
I2CHandle0.instance = TWI_BASE(1);
}
STATIC int i2c_find(mp_obj_t id) {
// given an integer id
int i2c_id = mp_obj_get_int(id);
if (i2c_id >= 0 && i2c_id <= MP_ARRAY_SIZE(machine_hard_i2c_obj)
&& machine_hard_i2c_obj[i2c_id].i2c != NULL) {
return i2c_id;
}
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
"I2C(%d) does not exist", i2c_id));
}
STATIC void machine_hard_i2c_print(const mp_print_t *print, mp_obj_t o, mp_print_kind_t kind) {
machine_hard_i2c_obj_t *self = o;
mp_printf(print, "I2C(%u, scl=(port=%u, pin=%u), sda=(port=%u, pin=%u))",
self->i2c->init.id,
self->i2c->init.scl_pin->port,
self->i2c->init.scl_pin->pin,
self->i2c->init.sda_pin->port,
self->i2c->init.sda_pin->pin);
}
/******************************************************************************/
/* MicroPython bindings for machine API */
// for make_new
enum {
ARG_NEW_id,
ARG_NEW_scl,
ARG_NEW_sda,
ARG_NEW_freq,
ARG_NEW_timeout,
};
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) {
static const mp_arg_t allowed_args[] = {
{ ARG_NEW_id, MP_ARG_REQUIRED | MP_ARG_OBJ },
{ ARG_NEW_scl, MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
{ ARG_NEW_sda, MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
};
// parse args
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(args[ARG_NEW_id].u_obj);
const machine_hard_i2c_obj_t *self = &machine_hard_i2c_obj[i2c_id];
if (args[ARG_NEW_scl].u_obj != MP_OBJ_NULL) {
self->i2c->init.scl_pin = args[ARG_NEW_scl].u_obj;
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
"I2C SCL Pin not set"));
}
if (args[ARG_NEW_sda].u_obj != MP_OBJ_NULL) {
self->i2c->init.sda_pin = args[ARG_NEW_sda].u_obj;
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
"I2C SDA Pin not set"));
}
self->i2c->init.freq = HAL_TWI_FREQ_100_Kbps;
hal_twi_master_init(self->i2c->instance, &self->i2c->init);
return MP_OBJ_FROM_PTR(self);
}
#include <stdio.h>
int machine_hard_i2c_readfrom(mp_obj_base_t *self_in, uint16_t addr, uint8_t *dest, size_t len, bool stop) {
printf("machine_hard_i2c_readfrom called\n");
return 0;
}
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 = (machine_hard_i2c_obj_t *)self_in;
hal_twi_master_tx(self->i2c->instance, addr, len, src, stop);
return 0;
}
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_PY_MACHINE_I2C