Add a method to read the OLED display buffer from user space (#8777)

* Adding extern and declaration

* Change to mediated buffer read

* Adding raw byte read

* Restore write raw... D'Oh

* Working struct return

* Pack that struct

* Remove conditional packing and add example to docs

* Cleanup tab/spaces

* Update docs/feature_oled_driver.md

Prettify formatting

* Update drivers/oled/oled_driver.h

Prettify formatting

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/oled/oled_driver.c b/drivers/oled/oled_driver.c
index f1990567f7..bbf010a090 100644
--- a/drivers/oled/oled_driver.c
+++ b/drivers/oled/oled_driver.c
@@ -444,6 +444,14 @@ void oled_pan(bool left) {
     oled_dirty = ~((OLED_BLOCK_TYPE)0);
 }
 
+oled_buffer_reader_t oled_read_raw(uint16_t start_index) {
+    if (start_index > OLED_MATRIX_SIZE) start_index = OLED_MATRIX_SIZE;
+    oled_buffer_reader_t ret_reader;
+    ret_reader.current_element = &oled_buffer[start_index];
+    ret_reader.remaining_element_count = OLED_MATRIX_SIZE - start_index;
+    return ret_reader;
+}
+
 void oled_write_raw_byte(const char data, uint16_t index) {
     if (index > OLED_MATRIX_SIZE) index = OLED_MATRIX_SIZE;
     if (oled_buffer[index] == data) return;