Skip to content
GitLab
Menu
Projects
Groups
Snippets
Loading...
Help
Help
Support
Community forum
Keyboard shortcuts
?
Submit feedback
Contribute to GitLab
Sign in / Register
Toggle navigation
Menu
Open sidebar
ruanhaishen
Nodemcu Firmware
Commits
5f1d3240
Commit
5f1d3240
authored
Mar 01, 2015
by
devsaurus
Browse files
remove caching
parent
32774d42
Changes
1
Hide whitespace changes
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);
...
...
Write
Preview
Markdown
is supported
0%
Try again
or
attach a new file
.
Attach a file
Cancel
You are about to add
0
people
to the discussion. Proceed with caution.
Finish editing this message first!
Cancel
Please
register
or
sign in
to comment