SamyGO

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In our product, light sensor operates only "Standard" mode.

Eco Sensor
step1 : Read the Lux five times as the unit of 400ms.
step2 : Transfrom the taken Lux to 20 level.
step3 : Get the most frequent grade, them set up the current level.
step4 : If |current level| - |previous level| > 1 , change the level
step5 : Refresh the Backlight set-up as the 200ms.

            Lux       > 200    190    ...   10   0  
  Sensor Backlight       20     19   ....    1   0

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step2 : Transfrom the taken Lux to 20 level.

Code: Select all

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/mman.h>
#include "sdp_i2c_io.h"
  
#define FATAL do { fprintf(stderr, "Error at line %d, file %s (%d) [%s]\n", \
  __LINE__, __FILE__, errno, strerror(errno)); exit(1); } while(0)
  
#define SADDR_ID_PANEL_TYPE      0x6911
#define SADDR_ID_MODEL           0x6912
#define SADDR_ID_PANELTIME       0x691c

int i2c_eeprom_comb_read(int fd, unsigned short subaddr, unsigned short len, unsigned char *buf) {
   struct sdp_i2c_packet_t iicp;
   unsigned char pSA[2];

   pSA[0]=(unsigned char)((subaddr >> 8) & 0xff);
   pSA[1]=(unsigned char)(subaddr & 0xff);
   printf("### i2c_eeprom_comb_read(): SA[0]=0x%02x SA[1]=0x%02x len=%d\n", pSA[0], pSA[1], len);
   iicp.slaveAddr=0xa0;
   iicp.subAddrSize=2;
   iicp.udelay=50;
   iicp.speedKhz=400;
   iicp.dataSize=len;
   iicp.pSubAddr=pSA;
   iicp.pDataBuffer=buf;
   iicp.reserve[0]=iicp.reserve[1]=iicp.reserve[2]=iicp.reserve[3]=0;
   
   return(ioctl(fd, I2C_CMD_COMBINED_READ, &iicp));
}

int main(int argc, char **argv) {
   int fd;
   unsigned char buf[64];
   
   // AT24C256B: I2C bus 1; slave 0xA0; 32kB
   if ((fd=open("/dev/sdp_i2c1", 0x1002)) == -1) FATAL;

   memset(buf, 0, sizeof(buf));
   int res=i2c_eeprom_comb_read(fd, SADDR_ID_MODEL, 1, buf);
   printf("### ioctl result=%d; ID_MODEL setting: %d (0x%02x)\n", res, buf[0], buf[0]);
   
   unsigned utmp=0;
   res=i2c_eeprom_comb_read(fd, SADDR_ID_PANELTIME, 4, (unsigned char *)&utmp);
   printf("### ioctl result=%d; ID_PANELTIME setting: %d (0x%08x) == %d (?) hours\n", res, utmp, utmp, utmp/6);

   close(fd);
   return 0;
}