uint8_t onewire_read_temp (struct onewire_temp_sensor *sensor)
//Temperatur eines DS18x20 auslesen und umrechnen
{
uint8_t spad[9];
uint8_t i;
uint8_t crc = 0;
float temp_f;
//einzelnen Sensor ansprechen
onewire_reset();
if (onewire_presence_pulse == 0) {
return 0;
}
onewire_send_byte(match_rom);
for (i=0; i<8; i++) {
onewire_send_byte(sensor->rom[i]);
}
//Scratchpad auslesen
onewire_send_byte(read_spad);
for (i=0; i<9; i++) {
spad[i] = onewire_read_byte();
}
//CRC Check
for (i=0; i<9; i++) {
crc = _crc_ibutton_update(crc, spad[i]);
}
//Temperatur berechnen
if (crc == 0) {
//0,5°C Bit löschen
spad[temperature_lsb] &= ~(1<<0);
//Temperatur umrechnen
if (spad[temperature_msb] == 0) {
temp_f = spad[temperature_lsb]/2.0;
}
else {
i = ~(spad[temperature_lsb]);
temp_f = i+1;
temp_f = (temp_f*(-1))/2.0;
}
//Nachkommaberechnung
temp_f = temp_f-0.25+(16.0-spad[count_remain])/16.0;
//Umrechnung, um Kommazahl als Int zu speichern und abspeichern
sensor->temperature = temp_f*100;
return 1;
}
return 0;
}
void onewire_send_command(uint8_t *rom, uint8_t command) {
//1Wire-Slave über die 64-bit Adresse ansprechen
unsigned char i;
onewire_reset();
for (i=0; i<8; i++) {
onewire_send_byte(*rom);
rom++;
}
onewire_send_byte(command);
}
void onewire_read_rom(uint8_t *rom) {
//Lesen der 64-bit Adresse
onewire_reset();
onewire_send_byte(read_rom);
/*Schleifenzähler läuft rückwärts, weil der Slave mit dem letzten Byte
(Family-Code) anfängt und so der ROM-Code richtig herum in "adresse" steht*/
for (uint8_t i=8; i>0; i--) {
*rom = onewire_read_byte();
rom++;
}
}
int main() {
U32 T_LED = 0L; // time of last digit update
U32 Tow = 0L; // 1-wire time
U32 T_btns = 0L; // buttons timer
U8 old_btns_state = 0;
U8 show_temp = 0; // =0 to show number; = 1 to show temp
// Configure clocking
CLK_CKDIVR = 0; // F_HSI = 16MHz, f_CPU = 16MHz
// Configure pins
CFG_GCR |= 1; // disable SWIM
LED_init();
CCR |= 0x28; // make shure that we are on level 3 - disabled SW priority
// Configure Timer1
// prescaler = f_{in}/f_{tim1} - 1
// set Timer1 to 1MHz: 16/1 - 1 = 15
TIM1_PSCRH = 0;
TIM1_PSCRL = 15; // LSB should be written last as it updates prescaler
// auto-reload each 1ms: TIM_ARR = 1000 = 0x03E8
TIM1_ARRH = 0x03;
TIM1_ARRL = 0xE8;
// interrupts: update
TIM1_IER = TIM_IER_UIE;
// auto-reload + interrupt on overflow + enable
TIM1_CR1 = TIM_CR1_APRE | TIM_CR1_URS | TIM_CR1_CEN;
onewire_setup();
eeprom_default_setup();
// enable all interrupts
enableInterrupts();
set_display_buf("---");
if(get_starting_val()){
matchROM = 1; // if ROMs not empty, start scanning
starting_val = 0; // reset starting value
}
start_temp_reading();
// Loop
do {
if(((U16)(Global_time - T_time) > temper_delay) || (T_time > Global_time)){
T_time = Global_time;
if(show_temp){ // show temperature
temper_delay = TEMPER_delay;
show_temp = 0;
if(!temp_ready || temp_readed == ERR_TEMP_VAL){
set_display_buf("eab");
}else{
temp_ready = 0;
if(temp_readed > -100 && temp_readed < 1000){
display_int((int)temp_readed, 0);
display_DP_at_pos(1);
}else{ // display only integer part
display_int((int)temp_readed/10, 0);
}
}
if(matchROM) ++starting_val;
}else{ // show number
show_temp = 1;
temper_delay = NUMBER_delay;
if(matchROM){
if(get_starting_val()){
display_int(starting_val+1,0);
read_next_sensor();
}else{
starting_val = 0;
if(start_temp_reading()){
if(!get_starting_val()){
matchROM = 0;
set_display_buf("eee");
}else{
display_int(starting_val+1,0);
read_next_sensor();
}
}
}
}else{
start_temp_reading();
}
}
}
if((U8)(Global_time - T_LED) > LED_delay){
T_LED = Global_time;
show_next_digit();
}
if((U8)(Global_time - T_btns) > BTNS_delay){
T_btns = Global_time;
if(!block_keys && old_btns_state != buttons_state){
U8 pressed = old_btns_state & ~buttons_state; // pressed buttons are ones
if(pressed){ // some buttons were pressed
if(pressed & STORE_BTN){
if(onewire_reset()){
delete_notexistant = 0;
block_keys = 1;
onewire_send_byte(OW_READ_ROM);
while(OW_BUSY);
ow_process_resdata = store_last_ROM;
onewire_receive_bytes(8);
}
}else if(pressed & DELETE_BTN){
delete_notexistant = 1;
}else if(pressed & DELALL_BTN){
U8 i;
for(i = 0; i < MAX_SENSORS; i++){
erase_saved_ROM(i);
set_display_buf("---");
matchROM = 0;
}
}
//display_int(pressed, 0);
}else{ // some buttons released
//display_int(~old_btns_state & buttons_state, 0); // released are ones
}
}
old_btns_state = buttons_state;
}
if(Global_time != Tow){ // process every byte not frequently than once per 1ms
Tow = Global_time;
process_onewire();
}
if(waitforread){
if(onewire_reset()){
ow_process_resdata = send_read_seq;
waitforread = 0;
if(!matchROM){
ow_data_array[0] = OW_READ_SCRATCHPAD;
ow_data_array[1] = OW_SKIP_ROM;
onewire_send_bytes(2);
}else{
read_next_sensor();
}
}
}
} while(1);
}
void onewire_start_temp(void) {
// Temperaturmessung an allen DS18x20 starten
onewire_reset();
onewire_send_byte(skip_rom);
onewire_send_byte(convert_t);
}
void readAddress(){
onewire_send_byte(0x33);
}
