有没有这个函数：CC2640R2_LAUNCHXL_shutDownExtFlash的介绍？

就是挂起外部FLASH的IO:
* ======== CC2640R2_LAUNCHXL_shutDownExtFlash ========
*/
void CC2640R2_LAUNCHXL_shutDownExtFlash(void)
{
/*
* To be sure we are putting the flash into sleep and not waking it,
* we first have to make a wake up call
*/
CC2640R2_LAUNCHXL_wakeUpExtFlash();

PIN_Config extFlashPinTable[] = {
/* SPI Flash CS*/
IOID_20 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_HIGH | PIN_PUSHPULL |
PIN_INPUT_DIS | PIN_DRVSTR_MED,
/* SPI Flash CLK */
IOID_10 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL |
PIN_INPUT_DIS | PIN_DRVSTR_MED,
/* SPI Flash MOSI */
IOID_9 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL |
PIN_INPUT_DIS | PIN_DRVSTR_MED,
/* SPI Flash MISO */
IOID_8 | PIN_INPUT_EN | PIN_PULLDOWN,
PIN_TERMINATE
};
PIN_State extFlashPinState;
PIN_Handle extFlashPinHandle = PIN_open(&extFlashPinState, extFlashPinTable);

uint8_t extFlashShutdown = 0xB9;

CC2640R2_LAUNCHXL_sendExtFlashByte(extFlashPinHandle, extFlashShutdown);

PIN_close(extFlashPinHandle);
}