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embed: add comment about why first value of display_id is discarded

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Pavol Rusnak 2018-08-04 17:15:29 +02:00
parent bc5dba751a
commit 68ef9b9322
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1 changed files with 1 additions and 1 deletions
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embed/extmod/modtrezorui/display-stm32.h
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@ -50,7 +50,7 @@ static uint32_t read_display_id(uint8_t command) {
volatile uint8_t c; volatile uint8_t c;
uint32_t id = 0; uint32_t id = 0;
CMD(command); CMD(command);
c = ADDR; c = ADDR; // first returned value is a dummy value and should be discarded
c = ADDR; id |= (c << 16); c = ADDR; id |= (c << 16);
c = ADDR; id |= (c << 8); c = ADDR; id |= (c << 8);
c = ADDR; id |= c; c = ADDR; id |= c;