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stmhal: Make stm.mem* support large integers. 

With these you can now do things like:

stm.mem32[0x20000000] = 0x80000000

and read 32-bit values. You can also read all the way to the end
of memory using either stm.mem32[0xfffffffc] or stm.mem32[-4].

IRQs shouldn't use mem32 at all since they'd fail if the top 2 bits
weren't equal, so IRQs should be using 16-bit I/O.
This commit is contained in:
Dave Hylands 2015-11-25 18:54:14 -08:00 committed by Damien George
parent 61e85a8ce0
commit 3048433809
1 changed files with 10 additions and 4 deletions
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14
stmhal/modstm.c
View File

@ -38,7 +38,10 @@
// 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;
uint32_t addr = mp_obj_get_int_truncated(addr_o);
if (MP_OBJ_IS_SMALL_INT(addr_o)) {
addr &= 0x7fffffff;
}
/*
if (addr < 0x10000000) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "cannot read from address %08x", addr));
@ -51,7 +54,10 @@ STATIC uint32_t get_read_addr(mp_obj_t addr_o, uint align) {
}
STATIC uint32_t get_write_addr(mp_obj_t addr_o, uint align) {
uint32_t addr = mp_obj_get_int(addr_o) & 0x7fffffff;
uint32_t addr = mp_obj_get_int_truncated(addr_o);
if (MP_OBJ_IS_SMALL_INT(addr_o)) {
addr &= 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.
@ -88,11 +94,11 @@ STATIC mp_obj_t stm_mem_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value)
case 2: val = (*(uint16_t*)addr); break;
default: val = (*(uint32_t*)addr); break;
}
return mp_obj_new_int(val);
return mp_obj_new_int_from_uint(val);
} else {
// store
uint32_t addr = get_write_addr(index, self->elem_size);
uint32_t val = mp_obj_get_int(value);
uint32_t val = mp_obj_get_int_truncated(value);
switch (self->elem_size) {
case 1: (*(uint8_t*)addr) = val; break;
case 2: (*(uint16_t*)addr) = val; break;