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器件型号：MSP430F5529 确定快速代码片段。 我预计 ADC12在进入计时器 B0中断时会很忙-但事实并非如此；所以我猜是我漏掉了启用的东西。 那有什么明显的东西吗？ 本周末我将仔细阅读相关文档。
int main(void)
{
// Stop WDT
HWREGW( WDT_A_BASE | WDTCTL ) = WDTPW|WDTHOLD;
// stop interupts whilst we configure
__disable_interrupt();
// first disable ADC12
HWREGW( ADC12_A_BASE | ADC12CTL0 )&= ~ADC12ENC;
HWREGW( ADC12_A_BASE | ADC12CTL0 )&= ~ADC12ON;
// 4 ticks sample and hold.
// 0x80 = 1 - sample on SHi signal
// 0x40 - 2.5V ADC12_A ref gen volt
// 0x20 - Ref on
// 0x10 =0 - ADC12_A is off
// 0x08 =0 - overflow int disable
// 0x04 =0 - conversion time int disable
// 0x02 - enable conversion ????
// 0x01 - Start conversiom
HWREGW( ADC12_A_BASE | ADC12CTL0 ) =
ADC12SHT0_0 | ADC12MSC | ADC12REF2_5V | ADC12REFON ;
// ADC12CSTARTADDx = 0 (write starting at ADC12MEM0)
// ADC12SHP =0
// ADC12SHSx = 2 - Timer B0
// ADC12ISSH = 0 Not inverted
// ADC12DIVx = 0 (divide by 1)
// ADC12SSELx = 3 (SMCLK)
HWREGW( ADC12_A_BASE | ADC12CTL1 ) =
ADC12SHS_2 | ADC12SSEL_3 ;
// ADC12PDIV =0 (predivide 1)
// ADC12TCOFF =0 (oddly means temp sensor on)
// ADC12RES=2 (12bit)
// ADC12DF=0 (unsigned)
// ADC12SR=0 (200ksps sample rate)
// ADC12REFOUT=1 = Ref Output on
// ADC12REFBURST=1 only on during sample and convert
HWREGW( ADC12_A_BASE | ADC12CTL2 ) =
ADC12RES_2 | ADC12REFOUT | ADC12REFBURST;
// ADC12SREF2 = 1 Vref- user the external reference
// ADC12SFREG01 = 11 or 10 - user Vref+
HWREGB( ADC12_A_BASE | ADC12MCTL0 ) = ADC12SREF_7 | ADC12INCH_0;
HWREGB( ADC12_A_BASE | ADC12MCTL1 ) = ADC12SREF_7 | ADC12INCH_10;
HWREGB( ADC12_A_BASE | ADC12MCTL2 ) = ADC12EOS;
// enable ADC12
HWREGW( ADC12_A_BASE | ADC12CTL0 )|= ADC12ON;
HWREGW( ADC12_A_BASE | ADC12CTL0 )|= ADC12ENC;
__enable_interrupt();
// now all set for now just loop, with LED flashing
while(1) {
}
}
// TIMER B CC
__attribute__ ((interrupt(TIMER0_B0_VECTOR)))
void TIMER0_B0_ISR (void)
{
sprintf(print,"%i\0", HWREGW( ADC12_A_BASE | ADC12CTL1 )&ADC12BUSY);
}
打印缓冲器由 USCI_A1中断进行处理并发送到 UART。
在 UART 上我只得到"0"输出、这是因为它是 Timer B 断流器例程中的第一条指令、也就是用来触发 ADC12的指令似乎是错误的。
有人有什么想法吗？ 我会继续挖掘。
