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DAC自校准问题

weifeng liu1
Prodigy 130 points
Other Parts Discussed in Thread: MSP430F2616

使用的型号是 MSP430F2616

DAC初始化时，校准一直不能通过。代码如下：

 DAC12_0CTL_bit.DAC12ENC = 0u;       // DAC12 is disabled
   DAC12_1CTL_bit.DAC12ENC = 0u;       // DAC12 is disabled

   // Reset the control registers to thier default power-up states.
   DAC12_0CTL = 0x0000u;
   DAC12_1CTL = 0x0000u;

   DAC12_1CTL_bit.DAC12OPS = 0u;       // outputs: DAC0 = P6.6, DAC1 = P6.7
   DAC12_1CTL_bit.DAC12SREFx = 2u;     // DAC reference = eVref+
   DAC12_1CTL_bit.DAC12RES = 0u;       // 12-bit resolution
   DAC12_1CTL_bit.DAC12LSELx = 0u;     // DAC12 values loaded immediately
   DAC12_1CTL_bit.DAC12IR = 1u;        // DAC output at 1X reference input
   DAC12_1CTL_bit.DAC12AMPx = 7u;      // In/out buffers = high speed/current
   DAC12_1CTL_bit.DAC12DF = 0u;        // staright binary data (0 to 0xFFFF)
   DAC12_1CTL_bit.DAC12IE = 0u;        // DAC12 interrupts disabled
   DAC12_1CTL_bit.DAC12IFG = 0u;       // clear any existing flags
   DAC12_1CTL_bit.DAC12GRP = 0u;       // DAC outputs are not grouped
   DAC12_1DAT = 0u;                    // Set initial output = 0V
   DAC12_1CTL_bit.DAC12ENC = 1u;       // DAC12 is enabled

   DAC12_1CTL_bit.DAC12CALON = 1u;     // Initiate DAC12 Calibration
   // Wait for calibration complete. bit will automatically reset
   do {TEST_HARNESS_TICK;} while(1u == DAC12_1CTL_bit.DAC12CALON);
请问这应该是什么问题，是DA的输出引脚电压一致有波动导致有问题吗？或者有什么定位的。