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display_identify: improve identification of ILI9341

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mcudev 2018-08-04 10:53:54 -04:00 committed by Pavol Rusnak
parent cc3882abf1
commit c0b5d33743
1 changed files with 16 additions and 2 deletions
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18
embed/extmod/modtrezorui/display-stm32.h
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@ -44,8 +44,7 @@
// ST7789V => 00 85 85 52
// GC9307 => 00 00 93 07
// ILI9341V => 00 00 80 00
// some of the modules return "00 00 00 00", which means the vendor did not set the value
// ILI9341V => 00 00 93 41
static uint32_t __attribute__((unused)) display_identify(void)
{
volatile uint8_t c;
@ -57,6 +56,21 @@ static uint32_t __attribute__((unused)) display_identify(void)
c = ADDR; id |= (c << 8); // ID2 - module/driver version ID
c = ADDR; id |= c; // ID3 - module/drive ID
// the default RDDID for ILI9341 should be 0x8000.
// some display modules return 0x0.
// the ILI9341 has an extra id, let's check it here.
if ((id != 0x858552U) && (id != 0x9307U)) { // if not ST7789V and not GC9307
uint32_t id4 = 0;
CMD(0xD3); // Read ID4
c = ADDR; // dummy data - discard
c = ADDR; id4 |= (c << 16); // IC version
c = ADDR; id4 |= (c << 8); // IC model name byte 1
c = ADDR; id4 |= c; // IC model name byte 2
if (id4 == 0x9341U) { // definitely found a ILI9341
id = id4;
}
}
return id;
}