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CC2650的IAR 的preprocessor 中的 $开头的是什么意思?

Other Parts Discussed in Thread: CC2650

$SRC_BLE_CORE$/controller/cc26xx/inc
$SRC_BLE_CORE$/inc
$SRC_EX$/common/cc26xx
$SRC_EX$/icall/inc
$SRC_EX$/inc
$SRC_EX$/profiles/batt/cc26xx
$SRC_EX$/profiles/dev_info
$SRC_EX$/profiles/heart_rate
$SRC_EX$/profiles/heart_rate/cc26xx
$SRC_EX$/profiles/hid_dev/cc26xx
$SRC_EX$/profiles/roles
$SRC_EX$/profiles/roles/cc26xx
$SRC_EX$/target
$SRC_COMMON$/hal/src/inc
$SRC_COMMON$/hal/src/target/_common
$SRC_COMMON$/hal/src/target/_common/cc26xx
$SRC_COMMON$/hal/src/target/cc2650/rom
$SRC_COMMON$/heapmgr
$SRC_COMMON$/icall/src/inc
$SRC_COMMON$/osal/src/inc
$SRC_COMMON$/services/src/saddr
$SRC_COMMON$/services/src/sdata
$CC26XXWARE$
$TI_RTOS_DRIVERS_BASE$

比如$SRC_COMMON, 是什么意思, SRC_COMMON是从哪来的?