F1C100S

溫度量測

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據說這個溫度感測是在TP模組內


A20 TP_FIFOCS


A20 TP_TPR


A20 TEMP_DATA


程式如下：

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <time.h>

uint32_t push_it(uint32_t v)
{
  int cc=0, r=0;
  static uint32_t buf[32]={0};

  for(cc=0; cc<31; cc++){
    buf[cc] = buf[cc + 1];
  }
  buf[31] = v;

  r = 0;
  for(cc=0; cc<32; cc++){
    r+= buf[cc];
  }
  return (r >> 5);
}
 
int main(int argc, char* argv[])
{
  int fd=-1;
  uint8_t *mem=NULL;
  uint32_t *TP_TPR=NULL;
  uint32_t *TP_FIFOCS=NULL;
  uint32_t *TEMP_DATA=NULL;
  uint32_t *TP_CTRL_REG1=NULL;

  fd = open("/dev/mem", O_RDWR);
  mem = mmap(0, 4096, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0x1c24000);
  printf("mmap addr: %p\n", mem); 

  TP_TPR = (uint32_t*)&mem[0x818];
  TP_FIFOCS = (uint32_t*)&mem[0x814];
  TEMP_DATA = (uint32_t*)&mem[0x820];
  TP_CTRL_REG1 = (uint32_t*)&mem[0x804];

  *TP_CTRL_REG1 = (1 << 5);
  *TP_TPR = (1 << 16);
  while(1){
    if(*TP_FIFOCS & (1 << 18)){
      *TP_FIFOCS = 0xffffffff;
      printf("temp: %d\n", push_it(*TEMP_DATA));
    }
    usleep(300000);
  }
  munmap(mem, 4096);
  close(fd);
  return 0;
}

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