msp149 8通道AD采集辣手问题

发表于 2010-7-13 16:01

片子是149型号，之前调单路P6.0通道ad采集，一切正常，
现在要采集8路ad，用P6脚序列多通道多次转换，初始化如下。调试发现，AD1通道依旧正常，AD2...AD8采集数不正确。望哪位朋友赐教。谢谢
  P6DIR =0x00;                         //p6=input
   P6SEL = 0xff;                      // Enable A/D channel A0 A1 A2 A3 ....A7
   ADC12MCTL0 |=0x020;                   //  sel channel A0 Sref=1       OUT  VR+=VEREF
   ADC12MCTL1 |=0x020;                   //  sel channel A1 Sref=1       OUT  VR+=VEREF
   ADC12MCTL2 |=0x022;                   //  sel channel A2 Sref=1       OUT  VR+=VEREF
   ADC12MCTL3 |=0x023;                   //  sel channel A3 Sref=1       OUT  VR+=VEREF
   ADC12MCTL4 |=0x024;                   //  sel channel A4 Sref=1       OUT  VR+=VEREF
   ADC12MCTL5 |=0x025;                   //  sel channel A5 Sref=1       OUT  VR+=VEREF
   ADC12MCTL6 |=0x026;                   //  sel channel A6 Sref=1       OUT  VR+=VEREF
   ADC12MCTL7 |=0x027;                   //  sel channel A7 Sref=1       OUT  VR+=VEREF
   //ADC12MCTL7 |=0x080;                   // set channel A7 last time

ADC12CTL0 = ADC12ON;//+SHT0_0;//+SHT1_0;
ADC12CTL0 |= 0x0080;                //MSC=1
   ADC12CTL1 = SHP;                   // Use sampling timer /ADC12OSC
ADC12CTL1 |= 0x0008;                   // ADC12SSEL=1 Use sampling timer /ACLK
ADC12CTL1 |= 0x0006;                   //mult channel conseq continue ad
ADC12CTL0 |= ENC;                   // Enable conversions
ADC12CTL0 |= ADC12SC;                   // Start conversion

发表于 2010-7-14 08:44

怎么没人回复啊。求版主发话了。

发表于 2010-7-16 21:01

好象不是这样初始化的吧。

#define P6OUT_INIT    0xff
#define P6SEL_INIT    0xff       // P6-Modules:A0,A1,A2,A3,A4,A5,A6,A7 ADC option select
#define P6DIR_INIT    0 // Init of Port6 Data-Direction Reg (Out=1 / Inp=0)

ADC12CTL0 = ADC12ON | MSC | REF2_5V | REFON | SHT0_DIV8; // Turn on ADC12, RefV = 2.5V,set sampling time 8us
ADC12CTL1 = SHP | ADC12DIV_7 | ADC12SSEL_MCLK | CONSEQ_1; // Use sampling timer, single sequence

ADC12MCTL0 = SREF_VREF_AVSS | INCH_0; // VR+ = VREF+ and VR-= AVSS, channel = A0
ADC12MCTL1 = SREF_VREF_AVSS | INCH_1;             // VR+ = VREF+ and VR-= AVSS, channel = A1
ADC12MCTL2 = SREF_VREF_AVSS | INCH_7; // VR+ = VREF+ and VR-= AVSS, channel = A7(BATT)
ADC12MCTL3 = SREF_VREF_AVSS | INCH_TEMP; // VR+ = VREF+ and VR-= AVSS, channel =  Temperature diode
ADC12MCTL4 = SREF_VREF_AVSS | INCH_VCC2 | EOS; //  VR+ = VREF+ and VR-= AVSS, channel = (AVCC - AVSS) / 2, end seq.

ADC12IE = BIT4;          // Enable ADC12IFG.4
ADC12CTL0 |= ENC;          // Enable conversions

发表于 2010-7-17 18:27

谢谢3楼回复，按你那样初始化按寄存器名定义，看起来方便，
问题也解决，初始化没修改，在采集时加了ADC12MCTL7 &=~0x080; //继续采集语句，
8通道一切就正常了。

msp149 8通道AD采集辣手问题

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