diff options
| author | Jonathan Rascher <jon@bcat.name> | 2021-06-16 00:30:27 -0500 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2021-06-15 22:30:27 -0700 |
| commit | d59f8d1c022234140a94c643f4b78bf5487d39f7 (patch) | |
| tree | 6ce2749491f3d13752cf299c112a2130de07192f /drivers/lcd/st7565.c | |
| parent | f8d0ea92060d33a23030635c6cd5f24a5926372e (diff) | |
Fix overrun in st7565_write_raw when not at (0, 0) (#13209)
Diffstat (limited to 'drivers/lcd/st7565.c')
| -rw-r--r-- | drivers/lcd/st7565.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/lcd/st7565.c b/drivers/lcd/st7565.c index 4b4891ce71..ee2661a5eb 100644 --- a/drivers/lcd/st7565.c +++ b/drivers/lcd/st7565.c @@ -336,8 +336,9 @@ void st7565_write_raw(const char *data, uint16_t size) { uint16_t cursor_start_index = st7565_cursor - &st7565_buffer[0]; if ((size + cursor_start_index) > ST7565_MATRIX_SIZE) size = ST7565_MATRIX_SIZE - cursor_start_index; for (uint16_t i = cursor_start_index; i < cursor_start_index + size; i++) { - if (st7565_buffer[i] == data[i]) continue; - st7565_buffer[i] = data[i]; + uint8_t c = *data++; + if (st7565_buffer[i] == c) continue; + st7565_buffer[i] = c; st7565_dirty |= ((ST7565_BLOCK_TYPE)1 << (i / ST7565_BLOCK_SIZE)); } } |