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Fix overrun in st7565_write_raw when not at (0, 0) (#13209)

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Jonathan Rascher 2021-06-16 00:30:27 -05:00 committed by GitHub
parent f8d0ea9206
commit d59f8d1c02
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1 changed files with 3 additions and 2 deletions
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drivers/lcd/st7565.c
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@ -336,8 +336,9 @@ void st7565_write_raw(const char *data, uint16_t size) {
uint16_t cursor_start_index = st7565_cursor - &st7565_buffer[0]; 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; 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++) { for (uint16_t i = cursor_start_index; i < cursor_start_index + size; i++) {
if (st7565_buffer[i] == data[i]) continue; uint8_t c = *data++;
st7565_buffer[i] = data[i]; if (st7565_buffer[i] == c) continue;
st7565_buffer[i] = c;
st7565_dirty |= ((ST7565_BLOCK_TYPE)1 << (i / ST7565_BLOCK_SIZE)); st7565_dirty |= ((ST7565_BLOCK_TYPE)1 << (i / ST7565_BLOCK_SIZE));
} }
} }