circuitpython/stmhal/modstm.c

133 lines
4.9 KiB
C

/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 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 STM32_HAL_H
#include "py/nlr.h"
#include "py/obj.h"
#include "portmodules.h"
// To use compile-time constants we are restricted to 31-bit numbers (a small int,
// so it fits in a Micro Python object pointer). Thus, when extracting a constant
// from an object, we must clear the MSB.
STATIC uint32_t get_read_addr(mp_obj_t addr_o, uint align) {
uint32_t addr = mp_obj_get_int(addr_o) & 0x7fffffff;
/*
if (addr < 0x10000000) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "cannot read from address %08x", addr));
}
*/
if ((addr & (align - 1)) != 0) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "address %08x is not aligned to %d bytes", addr, align));
}
return addr;
}
STATIC uint32_t get_write_addr(mp_obj_t addr_o, uint align) {
uint32_t addr = mp_obj_get_int(addr_o) & 0x7fffffff;
if (addr < 0x10000000) {
// Everything below 0x10000000 is either ROM or aliased to something higher, so we don't
// lose anything by restricting writes to this area, and we gain some safety.
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "cannot write to address %08x", addr));
}
if ((addr & (align - 1)) != 0) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "address %08x is not aligned to %d bytes", addr, align));
}
return addr;
}
typedef struct _stm_mem_obj_t {
mp_obj_base_t base;
uint32_t elem_size; // in bytes
} stm_mem_obj_t;
STATIC void stm_mem_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
stm_mem_obj_t *self = self_in;
mp_printf(print, "<%u-bit memory>", 8 * self->elem_size);
}
STATIC mp_obj_t stm_mem_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
// TODO support slice index to read/write multiple values at once
stm_mem_obj_t *self = self_in;
if (value == MP_OBJ_NULL) {
// delete
return MP_OBJ_NULL; // op not supported
} else if (value == MP_OBJ_SENTINEL) {
// load
uint32_t addr = get_read_addr(index, self->elem_size);
uint32_t val;
switch (self->elem_size) {
case 1: val = (*(uint8_t*)addr); break;
case 2: val = (*(uint16_t*)addr); break;
default: val = (*(uint32_t*)addr); break;
}
return mp_obj_new_int(val);
} else {
// store
uint32_t addr = get_write_addr(index, self->elem_size);
uint32_t val = mp_obj_get_int(value);
switch (self->elem_size) {
case 1: (*(uint8_t*)addr) = val; break;
case 2: (*(uint16_t*)addr) = val; break;
default: (*(uint32_t*)addr) = val; break;
}
return mp_const_none;
}
}
STATIC const mp_obj_type_t stm_mem_type = {
{ &mp_type_type },
.name = MP_QSTR_mem,
.print = stm_mem_print,
.subscr = stm_mem_subscr,
};
STATIC const stm_mem_obj_t stm_mem8_obj = {{&stm_mem_type}, 1};
STATIC const stm_mem_obj_t stm_mem16_obj = {{&stm_mem_type}, 2};
STATIC const stm_mem_obj_t stm_mem32_obj = {{&stm_mem_type}, 4};
STATIC const mp_map_elem_t stm_module_globals_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR_stm) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_mem8), (mp_obj_t)&stm_mem8_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_mem16), (mp_obj_t)&stm_mem16_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_mem32), (mp_obj_t)&stm_mem32_obj },
#include "genhdr/modstm_const.h"
};
STATIC MP_DEFINE_CONST_DICT(stm_module_globals, stm_module_globals_table);
const mp_obj_module_t stm_module = {
.base = { &mp_type_module },
.name = MP_QSTR_stm,
.globals = (mp_obj_dict_t*)&stm_module_globals,
};