/*Convert*/
int ds1820_convert(int sensor){
if(ds1820_reset(sensor)){
return 1;
}
ds1820_write_byte(DS1820_CMD_SKIPROM, sensor);
ds1820_write_byte(DS1820_CMD_CONVERTTEMP, sensor);
return 0;
}
static void ds1820_convert(void){
int code = 0;
portENTER_CRITICAL();
code = ds1820_reset();
if (code!= NO_ERROR)
ds1820_error(code);
ds1820_write_byte(SKIP_ROM);
ds1820_write_byte(CONVERT_TEMP);
ds1820_reset();
portEXIT_CRITICAL();
DQ_IN();
}
//#define CONSOLE_FLOAT_S( dp ,cp, var ) sprintf(cp, "%03d.%03d\r\n\0", (unsigned int)floor(var), (unsigned int)((var-floor(var))*pow(10, dp)));
static float ds1820_read_device(uint8_t * rom_code){
float retval;
uint16_t ds1820_temperature1 = 10000;
int ii;
uint8_t code = 0;
uint8_t sp1[9]; //temp to hold scratchpad memory
char c[25];
int tt = 0;
float rem = 0.0;
//portENTER_CRITICAL();
code = ds1820_reset();
if (code != NO_ERROR)
ds1820_error(code);
portENTER_CRITICAL();
ds1820_reset();
ds1820_write_byte(MATCH_ROM);
for (ii = 0; ii < 8; ii++)
{
ds1820_write_byte(rom_code[ii]);
}
ds1820_write_byte(READ_SCRATCHPAD);
for (ii = 0; ii < 9; ii++){
sp1[ii] = ds1820_read_byte();
}
ds1820_reset();
ds1820_temperature1 = sp1[1] & 0x0f;
ds1820_temperature1 <<= 8;
ds1820_temperature1 |= sp1[0];
// if the sensor is a 'B' type, we need a different conversion
if (rom_code[0] == '\x28')
{
ds1820_temperature1 >>= 4;
rem = 0.0;
if (sp1[0]&(0x01))
rem += POW_NEG_4;
if (sp1[0]&(0x02))
rem += POW_NEG_3;
if (sp1[0]&(0x04))
rem += POW_NEG_2;
if (sp1[0]&(0x08))
rem += POW_NEG_1;
retval = (float)ds1820_temperature1 + rem;
}
/**
* Called from ds1820_refrech_all()
*/
int ds1820_get_temp(int sensor){
uint8_t scratchpad[9];
int temp_val = 0;
int temp = 0;
do{
if(ds1820_reset(sensor)){
return DS1820_TEMP_NONE;
}
ds1820_write_byte(DS1820_CMD_SKIPROM, sensor);
ds1820_write_byte(DS1820_CMD_RSCRATCHPAD, sensor);
for(int i = 0; i < 9; i++){ //Read scratchpad
ds1820_read_byte(&scratchpad[i], sensor);
}
ds1820_reset(sensor);
}while(ds1820_crc_check(scratchpad)); //while CRC matches
//temp = MSB LSB
temp_val = scratchpad[0];
temp_val |= (scratchpad[1]<<8);
temp_val <<= 7; //keep sign bit
temp_val &= 0xFF00; //clear LSB
temp_val -= 0x40; //subtract 0.25d = 40h
temp_val += (((scratchpad[7] - scratchpad[6])<<8) / scratchpad[7]);
temp = temp_val >> 8;
temp *= 10;
temp += (((temp_val & 0x00FF) * 100)>>8) / 10;
return temp;
}
static uint8_t ds1820_search(){
uint8_t ii;
//char console_text[30];
ds1820_reset();
ds1820_write_byte(READ_ROM);
portENTER_CRITICAL();
for (ii = 0; ii < 8; ii++)
{
rom[ii] = ds1820_read_byte();
}
portEXIT_CRITICAL();
ds1820_reset();
return 0;
}
