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program will not fit into available memory

我在使用片外ADC进行采样并使用TI的FFT库函数作频谱分析时,当只采样一路数据时设置RFFT_STAGES =  8/9,SampleNum =256/512都可以,但是输入两路数据时设置RFFT_STAGES  = 9,SampleNum =512出现下面的错误,请指教,谢谢!

#define RFFT_STAGES   8(9)
#define RFFT_SIZE (1 << RFFT_STAGES)
#define PI 3.1415926535898
#define SampleNum        256(512)

错误提示:

"../28335_RFFT_RAM_lnk.cmd", line 129: error #10099-D: program will not fit into available memory. run placement with alignment/blocking fails for section ".ebss" size 0x14a1 page 1. Available memory ranges:
RAML2 size: 0x1000 unused: 0x1000 max hole: 0x1000
error #10010: errors encountered during linking; "ADCFFT8.out" not built

line 129:   .ebss            : > RAML2,     PAGE = 1