243 lines
6.7 KiB
C
243 lines
6.7 KiB
C
#include "FreeRTOS.h"
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#include "task.h"
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#include "math.h"
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#include "ds18b20.h"
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#define DS18B20_WRITE_SCRATCHPAD 0x4E
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#define DS18B20_READ_SCRATCHPAD 0xBE
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#define DS18B20_COPY_SCRATCHPAD 0x48
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#define DS18B20_READ_EEPROM 0xB8
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#define DS18B20_READ_PWRSUPPLY 0xB4
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#define DS18B20_SEARCHROM 0xF0
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#define DS18B20_SKIP_ROM 0xCC
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#define DS18B20_READROM 0x33
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#define DS18B20_MATCHROM 0x55
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#define DS18B20_ALARMSEARCH 0xEC
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#define DS18B20_CONVERT_T 0x44
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#define os_sleep_ms(x) vTaskDelay(((x) + portTICK_RATE_MS - 1) / portTICK_RATE_MS)
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#define DS18B20_FAMILY_ID 0x28
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#define DS18S20_FAMILY_ID 0x10
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#ifdef DS18B20_DEBUG
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#define debug(fmt, ...) printf("%s" fmt "\n", "DS18B20: ", ## __VA_ARGS__);
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#else
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#define debug(fmt, ...)
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#endif
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uint8_t ds18b20_read_all(uint8_t pin, ds_sensor_t *result) {
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onewire_addr_t addr;
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onewire_search_t search;
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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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debug("CRC check failed: %02X %02X\n", (unsigned)(addr >> 56), crc);
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return 0;
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}
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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_RATE_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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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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crc = onewire_crc8(get, 8);
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if (crc != get[8]){
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debug("CRC check failed: %02X %02X\n", get[8], crc);
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return 0;
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}
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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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//debug("Got a DS18B20 Reading: %d.%02d\n", (int)temperature, (int)(temperature - (int)temperature) * 100);
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result[sensor_id].id = sensor_id;
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result[sensor_id].value = temperature;
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sensor_id++;
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}
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return sensor_id;
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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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onewire_power(pin);
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vTaskDelay(750 / portTICK_RATE_MS);
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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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if (crc != get[8]){
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debug("CRC check failed: %02X %02X", get[8], crc);
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return 0;
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}
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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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return temperature;
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//debug("Got a DS18B20 Reading: %d.%02d\n", (int)temperature, (int)(temperature - (int)temperature) * 100);
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}
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bool ds18b20_measure(int pin, ds18b20_addr_t addr, bool wait) {
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if (!onewire_reset(pin)) {
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return false;
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}
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if (addr == DS18B20_ANY) {
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onewire_skip_rom(pin);
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} else {
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onewire_select(pin, addr);
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}
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taskENTER_CRITICAL();
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onewire_write(pin, DS18B20_CONVERT_T);
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// For parasitic devices, power must be applied within 10us after issuing
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// the convert command.
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onewire_power(pin);
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taskEXIT_CRITICAL();
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if (wait) {
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os_sleep_ms(750);
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onewire_depower(pin);
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}
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return true;
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}
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bool ds18b20_read_scratchpad(int pin, ds18b20_addr_t addr, uint8_t *buffer) {
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uint8_t crc;
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uint8_t expected_crc;
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if (!onewire_reset(pin)) {
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return false;
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}
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if (addr == DS18B20_ANY) {
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onewire_skip_rom(pin);
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} else {
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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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crc = onewire_read(pin);
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expected_crc = onewire_crc8(buffer, 8);
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if (crc != expected_crc) {
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debug("CRC check failed reading scratchpad: %02x %02x %02x %02x %02x %02x %02x %02x : %02x (expected %02x)\n", buffer[0], buffer[1], buffer[2], buffer[3], buffer[4], buffer[5], buffer[6], buffer[7], crc, expected_crc);
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return false;
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}
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return true;
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}
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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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if (!ds18b20_read_scratchpad(pin, addr, scratchpad)) {
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return NAN;
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}
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temp = scratchpad[1] << 8 | scratchpad[0];
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float res;
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if ((uint8_t)addr == DS18B20_FAMILY_ID) {
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res = ((float)temp * 625.0)/10000;
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}
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else {
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temp = ((temp & 0xfffe) << 3) + (16 - scratchpad[6]) - 4;
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res = ((float)temp * 625.0)/10000 - 0.25;
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}
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return res;
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}
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float ds18b20_measure_and_read(int pin, ds18b20_addr_t addr) {
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if (!ds18b20_measure(pin, addr, true)) {
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return NAN;
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}
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return ds18b20_read_temperature(pin, addr);
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}
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bool ds18b20_measure_and_read_multi(int pin, ds18b20_addr_t *addr_list, int addr_count, float *result_list) {
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if (!ds18b20_measure(pin, DS18B20_ANY, true)) {
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for (int i=0; i < addr_count; i++) {
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result_list[i] = NAN;
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}
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return false;
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}
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return ds18b20_read_temp_multi(pin, addr_list, addr_count, result_list);
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}
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int ds18b20_scan_devices(int pin, ds18b20_addr_t *addr_list, int addr_count) {
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onewire_search_t search;
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onewire_addr_t addr;
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int found = 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 family_id = (uint8_t)addr;
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if (family_id == DS18B20_FAMILY_ID || family_id == DS18S20_FAMILY_ID) {
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if (found < addr_count) {
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addr_list[found] = addr;
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}
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found++;
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}
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}
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return found;
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}
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bool ds18b20_read_temp_multi(int pin, ds18b20_addr_t *addr_list, int addr_count, float *result_list) {
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bool result = true;
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for (int i = 0; i < addr_count; i++) {
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result_list[i] = ds18b20_read_temperature(pin, addr_list[i]);
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if (isnan(result_list[i])) {
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result = false;
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}
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}
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return result;
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}
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