uint8_t DS18x20_Get_Conversion_Result_by_ROM_CRC(uint8_t (*serial)[DS18x20_SERIAL_NUM_SIZE], int32_t* temperature)
{
uint8_t cnt;
uint8_t pad[DS18x20_STRATCHPAD_SIZE];
/* Reset bus */
cnt = One_Wire_Reset();
if (cnt != ONE_WIRE_SUCCESS) {
return cnt;
}
One_Wire_Write_Byte(ONE_WIRE_MATCH_ROM);
for(cnt = 0; cnt != 8; cnt++) {
One_Wire_Write_Byte((*serial)[cnt]);
}
One_Wire_Write_Byte(DS18x20_READ_STRATCHPAD_CMD);
for(cnt = 0; cnt != DS18x20_STRATCHPAD_SIZE; cnt++) {
pad[cnt] = One_Wire_Read_Byte();
}
/* Verify CRC checksum */
if (Crc8Dallas(DS18x20_STRATCHPAD_SIZE, pad)) {
return ONE_WIRE_CRC_ERROR;
}
*temperature = DS18x20_Convert_Temperature(pad, serial);
return ONE_WIRE_SUCCESS;
}
unsigned char DS1821_Start_Conversion (GPIO_TypeDef * GPIOx, unsigned long PINx)
{
unsigned char cnt;
cnt=One_Wire_Reset(GPIOx, PINx);
if (cnt!=One_Wire_Success) return cnt;
One_Wire_Write_Byte(DS1821_START_CONVERT_T,GPIOx, PINx);
return One_Wire_Success;
}
unsigned char DS1821_Write_Status (GPIO_TypeDef * GPIOx, unsigned long PINx)
{
unsigned char cnt;
cnt=One_Wire_Reset(GPIOx, PINx);
if (cnt!=One_Wire_Success) return cnt;
One_Wire_Write_Byte(DS1821_WRITE_STATUS,GPIOx, PINx);
return One_Wire_Success;
}
unsigned char DS1821_Load_Counter (GPIO_TypeDef * GPIOx, unsigned long PINx)
{
unsigned char cnt;
cnt=One_Wire_Reset(GPIOx, PINx);
if (cnt!=One_Wire_Success) return cnt;
One_Wire_Write_Byte(DS1821_LOAD_COUNTER,GPIOx, PINx);
return One_Wire_Success;
}
unsigned char DS1821_Read_Status(unsigned int * status, GPIO_TypeDef * GPIOx, unsigned long PINx)
{
unsigned char tmp;
tmp=One_Wire_Reset(GPIOx, PINx);
if (tmp!=One_Wire_Success) return tmp;
One_Wire_Write_Byte(DS1821_READ_STATUS,GPIOx, PINx);
* status = One_Wire_Read_Byte(GPIOx, PINx);
return One_Wire_Success;
}
unsigned char DS1821_Read_Counter(unsigned int * counter, GPIO_TypeDef * GPIOx, unsigned long PINx)
{
unsigned char tmp;
tmp=One_Wire_Reset(GPIOx, PINx);
if (tmp!=One_Wire_Success) return tmp;
One_Wire_Write_Byte(DS1821_READ_COUNTER,GPIOx, PINx);
* counter = One_Wire_Read_Byte(GPIOx, PINx);
return One_Wire_Success;
}
unsigned char DS1821_Read_Temp(unsigned int * temperature, GPIO_TypeDef * GPIOx, unsigned long PINx)
{
unsigned char tmp;
tmp=One_Wire_Reset(GPIOx, PINx);
if (tmp!=One_Wire_Success) return tmp;
One_Wire_Write_Byte(DS1821_READ_TEMPERATURE, GPIOx, PINx);
* temperature = One_Wire_Read_Byte(GPIOx, PINx);
return One_Wire_Success;
}
uint8_t DS18x20_Search_Rom(uint8_t *devices_found, uint8_t (*serial)[ONE_WIRE_DEVICE_NUMBER_MAX][DS18x20_SERIAL_NUM_SIZE])
{
unsigned long path, next, pos;
uint8_t bit, chk;
uint8_t cnt_bit, cnt_byte, cnt_num,tmp;
path = 0;
cnt_num = 0;
do {
/* Reset bus */
tmp = One_Wire_Reset();
if (tmp != ONE_WIRE_SUCCESS) {
return tmp;
}
One_Wire_Write_Byte(ONE_WIRE_SEARCH_ROM);
next = 0;
pos = 1;
for (cnt_byte = 0; cnt_byte != 8; cnt_byte++) {
(*serial)[cnt_num][cnt_byte] = 0;
for (cnt_bit = 0; cnt_bit != 8; cnt_bit++) {
bit = One_Wire_Read_Bit();
chk = One_Wire_Read_Bit();
if (!bit && !chk) {
if (pos & path) {
bit = 1;
} else {
next = (path & (pos - 1)) | pos;
}
pos <<= 1;
}
One_Wire_Write_Bit(bit);
if (bit != 0) {
(*serial)[cnt_num][cnt_byte] |= (1 << cnt_bit);
}
}
}
path = next;
cnt_num++;
} while(path);
/* Write number of devices */
*devices_found = cnt_num;
return ONE_WIRE_SUCCESS;
}
uint8_t DS18x20_Start_Conversion_Skip_Rom(void)
{
uint8_t tmp;
/* Reset bus */
tmp = One_Wire_Reset();
if (tmp != ONE_WIRE_SUCCESS) {
return tmp;
}
One_Wire_Write_Byte(ONE_WIRE_SKIP_ROM);
One_Wire_Write_Byte(DS18x20_CONVERT_T_CMD);
if (One_Wire_Read_Byte()) {
return ONE_WIRE_DEVICE_BUSY;
}
return ONE_WIRE_SUCCESS;
}
uint8_t DS18x20_Start_Conversion_by_ROM(uint8_t (*serial)[DS18x20_SERIAL_NUM_SIZE])
{
uint8_t cnt;
/* Reset bus */
cnt = One_Wire_Reset();
if (cnt != ONE_WIRE_SUCCESS) {
return cnt;
}
One_Wire_Write_Byte(ONE_WIRE_MATCH_ROM);
for(cnt = 0; cnt != 8; cnt++) {
One_Wire_Write_Byte((*serial)[cnt]);
}
One_Wire_Write_Byte(DS18x20_CONVERT_T_CMD);
return ONE_WIRE_SUCCESS;
}
uint8_t DS18x20_Read_Temp_NoCRC_Skip_Rom(uint8_t (*serial)[DS18x20_SERIAL_NUM_SIZE], int32_t* temperature)
{
uint8_t tmp, cnt;
uint8_t pad[DS18x20_STRATCHPAD_SIZE];
/* Reset bus */
tmp = One_Wire_Reset();
if (tmp != ONE_WIRE_SUCCESS) {
return tmp;
}
One_Wire_Write_Byte(ONE_WIRE_SKIP_ROM);
One_Wire_Write_Byte(DS18x20_READ_STRATCHPAD_CMD);
for (cnt = 0; cnt != DS18x20_STRATCHPAD_SIZE; cnt++) {
pad[cnt] = One_Wire_Read_Byte();
}
*temperature = DS18x20_Convert_Temperature(pad, serial);
return ONE_WIRE_SUCCESS;
}
uint8_t DS18x20_Search_Rom_One_Device(uint8_t* serial[DS18x20_SERIAL_NUM_SIZE])
{
uint8_t cnt_bits;
uint8_t cnt_bytes;
uint8_t tmp;
uint8_t tmp2 = 0;
uint8_t dev_cnt = 0;
/* Reset bus */
tmp = One_Wire_Reset();
if (tmp != ONE_WIRE_SUCCESS) {
return tmp;
}
One_Wire_Write_Byte(ONE_WIRE_SEARCH_ROM);
for (cnt_bytes = 0; cnt_bytes != 8; cnt_bytes++) {
for (cnt_bits = 0; cnt_bits != 8; cnt_bits++) {
tmp = One_Wire_Read_Bit();
if (One_Wire_Read_Bit() == tmp) {
dev_cnt++;
}
One_Wire_Write_Bit(tmp);
if (tmp) {
tmp2 |= (1 << cnt_bits);
}
}
*serial[cnt_bytes]=tmp2;
tmp2=0;
}
/* Verify CRC checksum */
if (Crc8Dallas(DS18x20_SERIAL_NUM_SIZE, *serial)) {
return ONE_WIRE_CRC_ERROR;
}
return ONE_WIRE_SUCCESS;
}
