rpi4-osdev/part8-breakout-ble/mb.h

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extern volatile unsigned int mbox[36];
enum {
MBOX_REQUEST = 0
};
enum {
MBOX_CH_POWER = 0,
MBOX_CH_FB = 1,
MBOX_CH_VUART = 2,
MBOX_CH_VCHIQ = 3,
MBOX_CH_LEDS = 4,
MBOX_CH_BTNS = 5,
MBOX_CH_TOUCH = 6,
MBOX_CH_COUNT = 7,
MBOX_CH_PROP = 8 // Request from ARM for response by VideoCore
};
enum {
MBOX_TAG_SETPOWER = 0x28001,
MBOX_TAG_SETCLKRATE = 0x38002,
MBOX_TAG_SETPHYWH = 0x48003,
MBOX_TAG_SETVIRTWH = 0x48004,
MBOX_TAG_SETVIRTOFF = 0x48009,
MBOX_TAG_SETDEPTH = 0x48005,
MBOX_TAG_SETPXLORDR = 0x48006,
MBOX_TAG_GETFB = 0x40001,
MBOX_TAG_GETPITCH = 0x40008,
MBOX_TAG_LAST = 0
};
unsigned int mbox_call(unsigned char ch);