Use W801 I met him at the beginning 3 A question, It worked out, but we don't know why, Hope to update later SDK
[1] : Use SDK build-in cJSON The library appears the integer down function floor Undefined problem, floor It should be math. h A function of, There should be no undefined.
[solution] : will SDK build-in cJSON Library replace with, cJSON1. 5. 0 Version can be resolved. But the latest version cJSON Still unavailable. follow-up SDK Update can be updated under the own cJSON library.
[2] : About use SPI Bus driven external 25qxx series Flash. Use SDK Medium written wm_fls_gd25qxx. c Drive only drive GD25Q128, While driving commonly used Huabang (Winbond) w25q128 Failure to read will occur Flash ID, What I read is 0x0 perhaps 0xfffffff Cause drive failure. 
[solution] : As shown below, change-driven tls_spifls_read_id (u32 * id) function, Will which pass spi send cmd Change the length of 1. 
[3] : Use W801 Drive clock module DS1302 Find at, in CDK Mid-compile time, If you do not explicitly define the integer variable initialization, When doing a shift operation, The default variable will appear and the default initial value will be 1 Instead of 0. 
[solution] : right mid Perform initialization operations, The initial value is 0, Normally, if you don't assign an initialization value, it should default to 0 So it's weird. 
I really don't study well enough, Thanks for the Pointers!