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Function to read bytes from 16-bit LCD interface.

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...begin careful not to overread from the LCD, or overwrite to the buffer.
This commit is contained in:
Jared Boone 2016-02-19 15:29:00 -08:00
parent 1f79c72bf0
commit 6d0995e165
1 changed files with 14 additions and 0 deletions
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14
firmware/common/portapack_io.hpp
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@ -152,6 +152,20 @@ public:
} }
} }
void lcd_read_bytes(uint8_t* byte, size_t byte_count) {
size_t word_count = byte_count / 2;
while(word_count) {
const auto word = lcd_read_data_frame_memory();
*(byte++) = word >> 8;
*(byte++) = word >> 0;
word_count--;
}
if( byte_count & 1 ) {
const auto word = lcd_read_data_frame_memory();
*(byte++) = word >> 8;
}
}
uint32_t io_read() { uint32_t io_read() {
io_stb_assert(); io_stb_assert();
dir_read(); dir_read();