119 lines
4 KiB
C
119 lines
4 KiB
C
#include <stdio.h>
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#include <stdint.h>
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#include "stm32f4xx_hal.h"
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#include "nlr.h"
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#include "misc.h"
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#include "mpconfig.h"
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#include "qstr.h"
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#include "obj.h"
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#include "modstm.h"
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// To use compile-time constants we are restricted to 31-bit numbers (a small int,
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// so it fits in a Micro Python object pointer). Thus, when extracting a constant
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// from an object, we must clear the MSB.
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STATIC uint32_t get_read_addr(mp_obj_t addr_o, uint align) {
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uint32_t addr = mp_obj_get_int(addr_o) & 0x7fffffff;
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/*
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if (addr < 0x10000000) {
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "cannot read from address %08x", addr));
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}
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*/
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if ((addr & (align - 1)) != 0) {
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "address %08x is not aligned to %d bytes", addr, align));
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}
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return addr;
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}
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STATIC uint32_t get_write_addr(mp_obj_t addr_o, uint align) {
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uint32_t addr = mp_obj_get_int(addr_o) & 0x7fffffff;
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if (addr < 0x10000000) {
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// Everything below 0x10000000 is either ROM or aliased to something higher, so we don't
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// lose anything by restricting writes to this area, and we gain some safety.
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "cannot write to address %08x", addr));
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}
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if ((addr & (align - 1)) != 0) {
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "address %08x is not aligned to %d bytes", addr, align));
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}
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return addr;
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}
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typedef struct _stm_mem_obj_t {
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mp_obj_base_t base;
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uint32_t elem_size; // in bytes
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} stm_mem_obj_t;
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STATIC void stm_mem_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
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stm_mem_obj_t *self = self_in;
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print(env, "<%u-bit memory>", 8 * self->elem_size);
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}
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STATIC mp_obj_t stm_mem_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
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// TODO support slice index to read/write multiple values at once
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stm_mem_obj_t *self = self_in;
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if (value == MP_OBJ_NULL) {
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// delete
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return MP_OBJ_NOT_SUPPORTED;
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} else if (value == MP_OBJ_SENTINEL) {
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// load
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uint32_t addr = get_read_addr(index, self->elem_size);
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uint32_t val;
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switch (self->elem_size) {
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case 1: val = (*(uint8_t*)addr); break;
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case 2: val = (*(uint16_t*)addr); break;
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default: val = (*(uint32_t*)addr); break;
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}
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return mp_obj_new_int(val);
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} else {
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// store
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uint32_t addr = get_write_addr(index, self->elem_size);
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uint32_t val = mp_obj_get_int(value);
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switch (self->elem_size) {
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case 1: (*(uint8_t*)addr) = val; break;
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case 2: (*(uint16_t*)addr) = val; break;
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default: (*(uint32_t*)addr) = val; break;
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}
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return mp_const_none;
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}
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}
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STATIC const mp_obj_type_t stm_mem_type = {
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{ &mp_type_type },
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.name = MP_QSTR_mem,
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.print = stm_mem_print,
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.subscr = stm_mem_subscr,
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};
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STATIC const stm_mem_obj_t stm_mem8_obj = {{&stm_mem_type}, 1};
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STATIC const stm_mem_obj_t stm_mem16_obj = {{&stm_mem_type}, 2};
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STATIC const stm_mem_obj_t stm_mem32_obj = {{&stm_mem_type}, 4};
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STATIC const mp_map_elem_t stm_module_globals_table[] = {
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{ MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR_stm) },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_mem8), (mp_obj_t)&stm_mem8_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_mem16), (mp_obj_t)&stm_mem16_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_mem32), (mp_obj_t)&stm_mem32_obj },
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#include "modstmconst.gen.c"
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};
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STATIC const mp_obj_dict_t stm_module_globals = {
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.base = {&mp_type_dict},
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.map = {
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.all_keys_are_qstrs = 1,
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.table_is_fixed_array = 1,
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.used = sizeof(stm_module_globals_table) / sizeof(mp_map_elem_t),
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.alloc = sizeof(stm_module_globals_table) / sizeof(mp_map_elem_t),
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.table = (mp_map_elem_t*)stm_module_globals_table,
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},
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};
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const mp_obj_module_t stm_module = {
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.base = { &mp_type_module },
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.name = MP_QSTR_stm,
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.globals = (mp_obj_dict_t*)&stm_module_globals,
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};
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