[参考译文] TM4C123GH6PM：设置一个计时器、以在没有中断的情况下触发序列发生器采样

您好！

 我想您在使用 ADC 获取模拟样本、对吗？  

 是的、您可以将 ADC 配置为根据计时器触发器采样。 计时器不需要 t 生成中断。 可以将计时器配置为生成 ADC 的触发信号、而不是生成中断。  C：\ti\TivaWare_C_Series-2.2.0.295\examples\boards\ek-tm4c123gxl\adc_udma_pingpong 中提供了该函数的示例。 下面是代码片段。 请参阅下面以红色突出显示的代码、以使用 timer0作为 ADCSS0的触发器。  

//
// Enable sample sequence 0 with a processor signal trigger. Sequence 0
// will do a single sample when the processor sends a signal to start the
// conversion.
//
ADCSequenceConfigure(ADC0_BASE, 0, ADC_TRIGGER_TIMER, 0);

//
// Configure step 0 on sequence 0. Sample channel 3 (ADC_CTL_CH3) in
// single-ended mode (default) and configure the interrupt flag
// (ADC_CTL_IE) to be set when the sample is done. Tell the ADC logic
// that this is the last conversion on sequence 0 (ADC_CTL_END). Sequence
// 0 has 8 programmable steps. Since we are only doing a single conversion
// using sequence 0 we will only configure step 0. For more information
// on the ADC sequences and steps, reference the datasheet.
//
ADCSequenceStepConfigure(ADC0_BASE, 0, 0, ADC_CTL_CH3 | ADC_CTL_END |
ADC_CTL_IE);

//
// Since sample sequence 0 is now configured, it must be enabled.
//
ADCSequenceEnable(ADC0_BASE, 0);

//
// Clear the interrupt status flag. This is done to make sure the
// interrupt flag is cleared before we sample.
//
ADCIntClear(ADC0_BASE, 0);

//
// Enables the DMA channel for the ADC0 sample sequence 0.
//
ADCSequenceDMAEnable(ADC0_BASE, 0);

//
// Enable the ADC 0 sample sequence 0 interrupt.
//
ADCIntEnable(ADC0_BASE, 0);

//
// Enable the interrupt for ADC0 sequence 0 on the processor (NVIC).
//
IntEnable(INT_ADC0SS0);

//
// Configure a 16-bit periodic timer.
//
TimerConfigure(TIMER0_BASE, TIMER_CFG_SPLIT_PAIR | TIMER_CFG_A_PERIODIC);

//
// Set ADC sampling frequency to be 16KHz i.e. every 62.5uS.
//
TimerLoadSet(TIMER0_BASE, TIMER_A, (SysCtlClockGet()/16000) - 1);

//
// Enable the ADC trigger output for Timer A.
//
TimerControlTrigger(TIMER0_BASE, TIMER_A, true);

//
// Enable processor interrupts.
//
IntMasterEnable();

//
// Enable Timer 0 which will start the whole application process.
//
TimerEnable(TIMER0_BASE, TIMER_A);