[参考译文] MSP430FR5969：ADC->DMA-> fram的最佳资源

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Other Parts Discussed in Thread: ENERGIA

请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

https://e2e.ti.com/support/microcontrollers/msp-low-power-microcontrollers-group/msp430/f/msp-low-power-microcontroller-forum/1089630/msp430fr5969-best-resource-for-adc--dma--fram

部件号：MSP430FR5969
主题中讨论的其他部件：Energia

我想知道是否有从ADC12获取的样本数量可控的示例代码，然后通过DMA将数据存储到FRAM内存中。我从多个其他示例中将其拼合在一起，但一半语法不适用于我的Energia项目，导入所需的标题由于某种原因而无法正常工作。

我更喜欢一个可以直接从资源浏览器中提取的项目(如果存在用于不同MSP430的项目)。此ADC->DMA->FRAM示例是否存在于任何地方？

谢谢你。

3 年多前

0 admin 3 年多前

TI__Guru**** 2538930 points

请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

此程序以TI示例MSP430F55xx_DMA_04.c的形式开始使用，所需的更改相对较少。它写入SRAM，而不是FRAM。写入FRAM是一个小程序更改，但需要了解内存保护单元(MPU)。我建议您先尝试一下。

///
//  FR5969 ADC12->DMA demo
//  Started life as TI example MSP430F55xx_dma_04.c
//
#include <msp430.h>
#include <stdint.h>
#define DEMO_5969   1                       // Specifics for FR5969 and/or Launchpad
unsigned int DMA_DST;                       // ADC conversion result is stored in this variable

int main(void)
{
  WDTCTL = WDTPW+WDTHOLD;                   // Hold WDT

  P1OUT &= ~BIT0;                           // P1.0 clear
  P1DIR |= BIT0;                            // P1.0 output
#if DEMO_5969   // FR5969 Launchpad
  P1SEL0 |= BIT2;                           // P1.2 as A2 per
  P1SEL1 |= BIT2;                           //  SLAS704F Table 6-49
  PM5CTL0 &= ~LOCKLPM5;                     // Needed for FR5969, not for F5529
#else           // Original for F5529
  P5SEL |= BIT7;                            // P5.7/TB1 option select
  P5DIR |= BIT7;                            // Output direction
  P6SEL |= BIT0;                            // Enable A/D channel A0
#endif

  //Setup Timer B0
  TBCCR0 = 0xFFFE;
  TBCCR1 = 0x8000;
  TBCCTL1 = OUTMOD_3;                       // CCR1 set/reset mode
  TBCTL = TBSSEL_2+MC_1+TBCLR;              // SMCLK, Up-Mode

  // Setup ADC12
  ADC12CTL0 = ADC12SHT0_15+ADC12MSC+ADC12ON;// Sampling time, MSC, ADC12 on
  ADC12CTL1 = ADC12SHS_3+ADC12CONSEQ_2;     // Use sampling timer; ADC12MEM0
                                            // Sample-and-hold source = CCI0B =
                                            // TBCCR1 output
                                            // Repeated-single-channel
#if DEMO_5969  // Use A2 since A0/A1 are taken on the Launchpad
  ADC12MCTL0 = ADC12VRSEL_0+ADC12INCH_2;     // V+=AVcc V-=AVss, A0 channel
#else
  ADC12MCTL0 = ADC12SREF_0+ADC12INCH_0;     // V+=AVcc V-=AVss, A0 channel
#endif
  ADC12CTL0 |= ADC12ENC;

  // Setup DMA0
#if DEMO_5969     // Different DMA trigger number
  DMACTL0 = DMA0TSEL_26;                    // ADC12IFGx trigger per DS Table 6-12
#else
  DMACTL0 = DMA0TSEL_24;                    // ADC12IFGx triggered
#endif
  DMACTL4 = DMARMWDIS;                      // Read-modify-write disable
  DMA0CTL &= ~DMAIFG;
  DMA0CTL = DMADT_4+DMAEN+DMADSTINCR_0+DMAIE; // Rpt single tranfer, unchanged dst, Int
  DMA0SZ = 1;                               // DMA0 size = 1

  __data20_write_long((uintptr_t) &DMA0SA,(uintptr_t) &ADC12MEM0);
                                            // Source block address
  __data20_write_long((uintptr_t) &DMA0DA,(uintptr_t) &DMA_DST);
                                            // Destination single address
  __bis_SR_register(LPM0_bits + GIE);       // LPM0 w/ interrupts
  __no_operation();                         // used for debugging
}

//------------------------------------------------------------------------------
// DMA Interrupt Service Routine
//------------------------------------------------------------------------------
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=DMA_VECTOR
__interrupt void DMA_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(DMA_VECTOR))) DMA_ISR (void)
#else
#error Compiler not supported!
#endif
{
  switch(__even_in_range(DMAIV,16))
  {
    case 0: break;
    case 2:                                 // DMA0IFG = DMA Channel 0
      P1OUT ^= BIT0;                        // Toggle P1.0 - PLACE BREAKPOINT HERE AND CHECK DMA_DST VARIABLE
      break;
    case 4: break;                          // DMA1IFG = DMA Channel 1
    case 6: break;                          // DMA2IFG = DMA Channel 2
    case 8: break;                          // DMA3IFG = DMA Channel 3
    case 10: break;                         // DMA4IFG = DMA Channel 4
    case 12: break;                         // DMA5IFG = DMA Channel 5
    case 14: break;                         // DMA6IFG = DMA Channel 6
    case 16: break;                         // DMA7IFG = DMA Channel 7
    default: break;
  }
}

[编辑：为了参考，原始文件位于此处：

https://dev.ti.com/tirex/explore/node?node=ALkqBIa6R80LFOC7XAng.Q__IOGqZri__LATEST

]