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f28335-代码解析

ZENGZHEN XING
Expert 1476 points


#define DELAY_US(A)  DSP28x_usDelay(((((long double) A * 1000.0L) / (long double)CPU_CLOCK_SPEED) - 9.0L) / 5.0L)

这段代码中的"数字+L",例如1000.0L，是这么意思