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| /*####################################################################################### |
| MK3Mag 3D-Magnet sensor |
| !!! THIS IS NOT FREE SOFTWARE !!! |
| #######################################################################################*/ |
| // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| // + Copyright (c) 05.2008 Holger Buss |
| // + Thanks to Ilja Fähnrich (P_Latzhalter) |
| // + Nur für den privaten Gebrauch |
| // + www.MikroKopter.com |
| // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| // + Die Portierung der Software (oder Teile davon) auf andere Systeme (ausser der Hardware von www.mikrokopter.de) ist nur |
| // + mit unserer Zustimmung zulässig |
| // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| // + Es gilt für das gesamte Projekt (Hardware, Software, Binärfiles, Sourcecode und Dokumentation), |
| // + dass eine Nutzung (auch auszugsweise) nur für den privaten (nicht-kommerziellen) Gebrauch zulässig ist. |
| // + AUSNAHME: Ein bei www.mikrokopter.de erworbener vorbestückter MK3Mag darf als Baugruppe auch in kommerziellen Systemen verbaut werden |
| // + Im Zweifelsfall bitte anfragen bei: info@mikrokopter.de |
| // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| // + Werden Teile des Quellcodes (mit oder ohne Modifikation) weiterverwendet oder veröffentlicht, |
| // + unterliegen sie auch diesen Nutzungsbedingungen und diese Nutzungsbedingungen incl. Copyright müssen dann beiliegen |
| // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| // + Sollte die Software (auch auszugesweise) oder sonstige Informationen des MikroKopter-Projekts |
| // + auf anderen Webseiten oder sonstigen Medien veröffentlicht werden, muss unsere Webseite "http://www.mikrokopter.de" |
| // + eindeutig als Ursprung verlinkt werden |
| // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| // + Keine Gewähr auf Fehlerfreiheit, Vollständigkeit oder Funktion |
| // + Benutzung auf eigene Gefahr |
| // + Wir übernehmen keinerlei Haftung für direkte oder indirekte Personen- oder Sachschäden |
| // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| // + Die Funktion printf_P() unterliegt ihrer eigenen Lizenz und ist hiervon nicht betroffen |
| // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| // + Redistributions of source code (with or without modifications) must retain the above copyright notice, |
| // + this list of conditions and the following disclaimer. |
| // + * PORTING this software (or parts of it) to systems (other than hardware from www.mikrokopter.de) is NOT allowed |
| // + * Neither the name of the copyright holders nor the names of contributors may be used to endorse or promote products derived |
| // + from this software without specific prior written permission. |
| // + * The use of this project (hardware, software, binary files, sources and documentation) is only permittet |
| // + for non-commercial use (directly or indirectly) |
| // + Commercial use (for excample: selling of MikroKopters, selling of PCBs, assembly, ...) is only permitted |
| // + with our written permission |
| // + Exception: A preassembled MK3Mag, purchased from www.mikrokopter.de may be used as a part of commercial systems |
| // + In case of doubt please contact: info@MikroKopter.de |
| // + * If sources or documentations are redistributet on other webpages, our webpage (http://www.MikroKopter.de) must be |
| // + clearly linked as origin |
| // + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| // + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| // + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| // + ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| // + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| // + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| // + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| // + INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| // + CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| // + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| // + POSSIBILITY OF SUCH DAMAGE. |
| // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| #include <inttypes.h> |
| #include <avr/io.h> |
| #include <avr/interrupt.h> |
| #include "main.h" |
| |
| volatile uint16_t CountMilliseconds = 0; |
| volatile uint16_t I2C_Timeout = 0; |
| |
| |
| /*****************************************************/ |
| /* Initialize Timer 0 */ |
| /*****************************************************/ |
| void TIMER0_Init(void) |
| { |
| // set PB2 as output for the PWM used to signal compass heading |
| DDRB |= (1<<DDB2); |
| PORTB &= ~(1<<PORTB2); |
| |
| |
| // Timer/Counter 0 Control Register A |
| |
| // Normal Timer Counter Mode (Bits WGM02 = 0, WGM01 = 0, WGM00 = 0) |
| // OC0A disconnected (Bits COM0A1 = 0, COM0A0 = 0) |
| // OC0B disconnected (Bits COM0B1 = 0, COM0B0 = 0) |
| TCCR0A &= ~((1<<COM0A1)|(1<<COM0A0)|(1<<COM0B1)|(1<<COM0B0)|(1<<WGM01)|(1<<WGM00)); |
| |
| // Timer/Counter 0 Control Register B |
| |
| // set clock devider for timer 0 to SYSKLOCK/8 = 8MHz / 8 = 1MHz |
| // i.e. the timer increments from 0x00 to 0xFF with an update rate of 2.5 MHz |
| // hence the timer overflow interrupt frequency is 2.5 MHz / 256 = 9.765 kHz |
| |
| // divider 8 (Bits CS02 = 0, CS01 = 1, CS00 = 0) |
| TCCR0B &= ~((1<<FOC0A)|(1<<FOC0B)|(1<<WGM02)|(1<<CS02)); |
| TCCR0B = (1<<CS01)|(0<<CS00); |
| |
| // init Timer/Counter 0 Register |
| TCNT0 = 0; |
| |
| // Timer/Counter 0 Interrupt Mask Register |
| // enable timer overflow interrupt only |
| TIMSK0 &= ~((1<<OCIE0B)|(1<<OCIE0A)); |
| TIMSK0 |= (1<<TOIE0); |
| |
| } |
| |
| |
| // ----------------------------------------------------------------------- |
| ISR(TIMER0_OVF_vect) |
| { |
| static uint8_t cnt; |
| static uint16_t cmps_cnt; |
| |
| // reload timer register so that overflow occurs after 100 increments at 1 MHz |
| // resulting in a calling rate of this ISR of 10kHz or 0.1 ms. |
| TCNT0 -= 101; |
| |
| // disable PWM when bad compass heading value |
| if(Heading < 0) |
| { |
| PORTB &= ~(1<<PORTB2); |
| cmps_cnt = 0; |
| } |
| else |
| { |
| // if a periode of 38.0 ms is over |
| if(++cmps_cnt >= 380) |
| { |
| // set PWM out to high |
| PORTB |= (1<<PORTB2); |
| // reset periode counter |
| cmps_cnt = 0; |
| } |
| // if the delay in 0.1 ms is equal to Heading + 10 |
| else if(cmps_cnt >= (Heading + 10)) |
| { |
| // set PWM out to low |
| PORTB &= ~(1<<PORTB2); |
| } |
| } |
| |
| if(!--cnt) |
| { |
| // every 10th run (1kHz or 1ms) |
| cnt = 10; |
| CountMilliseconds++; |
| if(I2C_Timeout) I2C_Timeout--; |
| } |
| } |
| |
| |
| // ----------------------------------------------------------------------- |
| uint16_t SetDelay (uint16_t t) |
| { |
| return(CountMilliseconds + t - 1); |
| } |
| |
| // ----------------------------------------------------------------------- |
| int8_t CheckDelay(uint16_t t) |
| { |
| return(((t - CountMilliseconds) & 0x8000) >> 8); // check sign bit |
| } |
| |
| // ----------------------------------------------------------------------- |
| void Delay_ms(uint16_t wait) |
| { |
| uint16_t t_stop; |
| t_stop = SetDelay(wait); |
| while (!CheckDelay(t_stop)); |
| } |
| |