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ruanhaishen
Nodemcu Firmware
Commits
5f1d3240
Commit
5f1d3240
authored
Mar 01, 2015
by
devsaurus
Browse files
remove caching
parent
32774d42
Changes
1
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Inline
Side-by-side
app/modules/u8g.c
View file @
5f1d3240
...
...
@@ -35,28 +35,15 @@ typedef struct _lu8g_userdata_t lu8g_userdata_t;
//};
static
uint32_t
*
u8g_pgm_cached_iadr
=
NULL
;
static
uint32_t
u8g_pgm_cached_data
;
// function to read 4-byte aligned from program memory AKA irom0
u8g_pgm_uint8_t
ICACHE_FLASH_ATTR
u8g_pgm_read
(
const
u8g_pgm_uint8_t
*
adr
)
{
uint32_t
iadr
=
(
uint32_t
)
adr
;
// set up pointer to 4-byte aligned memory location
uint32_t
*
ptr
=
(
uint32_t
*
)(
iadr
&
~
0x3
);
uint32_t
pgm_data
;
if
(
ptr
==
u8g_pgm_cached_iadr
)
{
pgm_data
=
u8g_pgm_cached_data
;
}
else
{
// read 4-byte aligned
pgm_data
=
*
ptr
;
u8g_pgm_cached_iadr
=
ptr
;
u8g_pgm_cached_data
=
pgm_data
;
}
// read 4-byte aligned
uint32_t
pgm_data
=
*
ptr
;
// return the correct byte within the retrieved 32bit word
return
pgm_data
>>
((
iadr
%
4
)
*
8
);
...
...
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