Created
July 5, 2021 19:09
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// Read current external display brightness | |
data[0] = 0x82; | |
data[1] = 0x01; | |
data[2] = BRIGHTNESS; | |
err = IOAVServiceWriteI2C(avService, 0x37, 0x00, data, 3); | |
if (err) { | |
NSLog(@"Something went wrong: %s", mach_error_string(err)); | |
return 1; | |
} | |
usleep(35000); | |
err = IOAVServiceReadI2C(avService, 0x37, 0x00, data, 12); | |
if (err) { | |
NSLog(@"Something went wrong: %s", mach_error_string(err)); | |
return 1; | |
} | |
usleep(35000); | |
NSLog(@"External display brightness read: %d", data[9]); | |
if (data[9] != out_brightness) { | |
NSLog(@"Setting brightness to %d for %@", out_brightness, | |
avService); | |
data[0] = 0x84; | |
data[1] = 0x03; | |
data[2] = BRIGHTNESS; | |
data[3] = 0x00; | |
data[4] = out_brightness; | |
err = IOAVServiceWriteI2C(avService, 0x37, 0x00, data, 5); | |
if (err) { | |
NSLog(@"Something went wrong: %s", mach_error_string(err)); | |
return 1; | |
} |
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