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AP_OSD: ensure spi_buffer space

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This commit is contained in:
Alexander Malishev 2018-07-10 00:51:15 +04:00 committed by Andrew Tridgell
parent ac71a181d6
commit d2e05eb927
2 changed files with 4 additions and 6 deletions
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7
libraries/AP_OSD/AP_OSD_MAX7456.cpp
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@ -361,7 +361,6 @@ void AP_OSD_MAX7456::flush()
void AP_OSD_MAX7456::transfer_frame()
{
uint16_t updated_chars = 0;
uint8_t last_attribute = 0xFF;
uint16_t previous_pos = UINT16_MAX - 1;
if (!initialized) {
@ -375,7 +374,8 @@ void AP_OSD_MAX7456::transfer_frame()
if (frame[y][x] == shadow_frame[y][x] && attr[y][x] == shadow_attr[y][x]) {
continue;
}
if (updated_chars > max_updated_chars) {
//ensure space for 1 char and escape sequence
if (buffer_offset >= spi_buffer_size - 32) {
break;
}
shadow_frame[y][x] = frame[y][x];
@ -389,7 +389,7 @@ void AP_OSD_MAX7456::transfer_frame()
if (position_changed) {
//it is impossible to write to MAX7456ADD_DMAH/MAX7456ADD_DMAL in autoincrement mode
//so, exit autoincrement mode
if (updated_chars != 0) {
if (buffer_offset != 0) {
buffer_add_cmd(MAX7456ADD_DMDI, 0xFF);
buffer_add_cmd(MAX7456ADD_DMM, 0);
}
@ -404,7 +404,6 @@ void AP_OSD_MAX7456::transfer_frame()
}
buffer_add_cmd(MAX7456ADD_DMDI, chr);
updated_chars++;
previous_pos = pos;
}
}

3
libraries/AP_OSD/AP_OSD_MAX7456.h
View File

@ -64,8 +64,7 @@ private:
static const uint8_t video_lines_ntsc = 13;
static const uint8_t video_lines_pal = 16;
static const uint8_t video_columns = 30;
static const uint16_t max_updated_chars = 64; //up to 480
static const uint16_t spi_buffer_size = ((max_updated_chars + 1) * 8);
static const uint16_t spi_buffer_size = 512;
uint8_t frame[video_lines_pal][video_columns];