Заменить SAMPLES на j

#include "LiquidCrystal.h"
LiquidCrystal lcd(PA0, PA1, PA2, PA3, PA4, PA5);

///////////////////////////
int j;
#define SAMPLES 88
///////////////////////////

#include <libmaple/dma.h>

dma_tube_config dma_cfg;

int flag1 = 0;
int out1 = PB7;
int val1[SAMPLES];

int amp = 50;
int cnt = 0;
int time_track = 0;
float stp = 6.2831 / SAMPLES;
//float stp = 7.8539/SAMPLES;
int ret = 17;

timer_dev *dev1 = PIN_MAP[out1].timer_device;

uint8 cc_channel1 = PIN_MAP[out1].timer_channel;


void fun()
{
  flag1++;
}

void timer_conf()
{

  timer_dma_set_base_addr(dev1, TIMER_DMA_BASE_CCR2);
  timer_dma_set_burst_len(dev1, 1);
  timer_dma_enable_req(dev1, cc_channel1);
  timer_set_reload(dev1, 102);
  timer_set_prescaler(dev1, 0);

}

void dma_conf()
{
  dma_init(DMA1);
  /* T4C2 DMA C4 */
  dma_cfg.tube_dst = &(dev1->regs.gen->DMAR);
  dma_cfg.tube_dst_size = DMA_SIZE_32BITS;
  dma_cfg.tube_src = val1;
  dma_cfg.tube_src_size = DMA_SIZE_32BITS;

  dma_cfg.tube_nr_xfers = SAMPLES;
  dma_cfg.tube_flags = DMA_CFG_SRC_INC | DMA_CFG_CIRC | DMA_CFG_CMPLT_IE;

  dma_cfg.tube_req_src = DMA_REQ_SRC_TIM4_CH2;
  dma_cfg.target_data = 0;

  ret = dma_tube_cfg(DMA1, DMA_CH4, &dma_cfg);

}

void dma_start()
{
  dma_attach_interrupt(DMA1, DMA_CH4, fun);

  dma_enable(DMA1, DMA_CH4);
  timer_resume(dev1);


  dma_enable(DMA1, DMA_CH2);//
  //  timer_resume(dev2);
}

void init_wave()
{
  int i;
  for (i = 0; i < SAMPLES; i++)
  {
    val1[i] = 50 + amp * sin(stp * i);

  }
}


void setup() {


  lcd.begin(16, 2);

  int i;
  int j;

  pinMode(out1, PWM);
  pinMode(PB13, INPUT_PULLDOWN);
  pinMode(PB12, INPUT_PULLDOWN);


  timer_conf();
  dma_conf();
  dma_start();

  init_wave();
}

void loop()
{
  if (digitalRead(PB12) == HIGH)
    // if (digitalRead(PB6) == HIGH) // UP
  {
    if (j < 200)
      // if (i < 25)
    {
      j++;

    }
  }

  if (digitalRead(PB13) == HIGH)

  {
    if (j > 0)
    {
      j--;

    }
  }
  lcd.setCursor(0, 1);
  lcd.print("j = ");
  lcd.setCursor(4, 1);
  lcd.print(j);

  delay(100);
}