Merge pull request #295 from sheinz/fix/ds18b20_negative_temp
ds18b20 fix for temperature below zero
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commit
4d00566421
1 changed files with 12 additions and 12 deletions
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@ -33,7 +33,7 @@ uint8_t ds18b20_read_all(uint8_t pin, ds_sensor_t *result) {
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uint8_t sensor_id = 0;
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onewire_search_start(&search);
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while ((addr = onewire_search_next(&search, pin)) != ONEWIRE_NONE) {
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uint8_t crc = onewire_crc8((uint8_t *)&addr, 7);
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if (crc != (addr >> 56)){
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@ -44,10 +44,10 @@ uint8_t ds18b20_read_all(uint8_t pin, ds_sensor_t *result) {
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onewire_reset(pin);
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onewire_select(pin, addr);
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onewire_write(pin, DS18B20_CONVERT_T);
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onewire_power(pin);
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vTaskDelay(750 / portTICK_PERIOD_MS);
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onewire_reset(pin);
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onewire_select(pin, addr);
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onewire_write(pin, DS18B20_READ_SCRATCHPAD);
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@ -57,7 +57,7 @@ uint8_t ds18b20_read_all(uint8_t pin, ds_sensor_t *result) {
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for (int k=0;k<9;k++){
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get[k]=onewire_read(pin);
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}
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//debug("\n ScratchPAD DATA = %X %X %X %X %X %X %X %X %X\n",get[8],get[7],get[6],get[5],get[4],get[3],get[2],get[1],get[0]);
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crc = onewire_crc8(get, 8);
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@ -69,7 +69,7 @@ uint8_t ds18b20_read_all(uint8_t pin, ds_sensor_t *result) {
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uint8_t temp_msb = get[1]; // Sign byte + lsbit
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uint8_t temp_lsb = get[0]; // Temp data plus lsb
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uint16_t temp = temp_msb << 8 | temp_lsb;
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float temperature;
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temperature = (temp * 625.0)/10000;
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@ -82,7 +82,7 @@ uint8_t ds18b20_read_all(uint8_t pin, ds_sensor_t *result) {
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}
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float ds18b20_read_single(uint8_t pin) {
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onewire_reset(pin);
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onewire_skip_rom(pin);
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onewire_write(pin, DS18B20_CONVERT_T);
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@ -93,13 +93,13 @@ float ds18b20_read_single(uint8_t pin) {
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onewire_reset(pin);
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onewire_skip_rom(pin);
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onewire_write(pin, DS18B20_READ_SCRATCHPAD);
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uint8_t get[10];
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for (int k=0;k<9;k++){
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get[k]=onewire_read(pin);
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}
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//debug("\n ScratchPAD DATA = %X %X %X %X %X %X %X %X %X\n",get[8],get[7],get[6],get[5],get[4],get[3],get[2],get[1],get[0]);
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uint8_t crc = onewire_crc8(get, 8);
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@ -110,9 +110,9 @@ float ds18b20_read_single(uint8_t pin) {
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uint8_t temp_msb = get[1]; // Sign byte + lsbit
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uint8_t temp_lsb = get[0]; // Temp data plus lsb
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uint16_t temp = temp_msb << 8 | temp_lsb;
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float temperature;
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temperature = (temp * 625.0)/10000;
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@ -157,7 +157,7 @@ bool ds18b20_read_scratchpad(int pin, ds18b20_addr_t addr, uint8_t *buffer) {
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onewire_select(pin, addr);
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}
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onewire_write(pin, DS18B20_READ_SCRATCHPAD);
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for (int i = 0; i < 8; i++) {
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buffer[i] = onewire_read(pin);
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}
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@ -174,7 +174,7 @@ bool ds18b20_read_scratchpad(int pin, ds18b20_addr_t addr, uint8_t *buffer) {
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float ds18b20_read_temperature(int pin, ds18b20_addr_t addr) {
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uint8_t scratchpad[8];
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int temp;
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int16_t temp;
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if (!ds18b20_read_scratchpad(pin, addr, scratchpad)) {
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return NAN;
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