Rev 2039 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1612 | dongfang | 1 | #include <avr/io.h> |
| 2 | #include <avr/interrupt.h> |
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| 3 | #include "uart1.h" |
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| 2039 | - | 4 | #include "ubx.h" |
| 1612 | dongfang | 5 | |
| 6 | #define USART1_BAUD 57600 |
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| 7 | |||
| 8 | /****************************************************************/ |
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| 9 | /* Initialization of the USART1 */ |
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| 10 | /****************************************************************/ |
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| 2039 | - | 11 | void usart1_init(void) { |
| 1612 | dongfang | 12 | // USART1 Control and Status Register A, B, C and baud rate register |
| 13 | uint8_t sreg = SREG; |
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| 2189 | - | 14 | uint16_t ubrr = (uint16_t) (F_CPU / (8 * USART1_BAUD) - 1); |
| 1612 | dongfang | 15 | |
| 16 | // disable all interrupts before reconfiguration |
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| 17 | cli(); |
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| 18 | |||
| 2039 | - | 19 | // disable RX-Interrupt, disable TX-Interrupt, disable DRE-Interrupt |
| 20 | UCSR1B &= ~ ((1 << RXCIE1) | (1 << TXCIE1) | (1 << UDRIE1)); |
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| 1612 | dongfang | 21 | |
| 22 | // set direction of RXD1 and TXD1 pins |
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| 2039 | - | 23 | // set RXD1 (PD2) as an input pin, set TXD1 (PD3) as an output pin |
| 24 | PORTD |= (1 << PORTD2) | (1 << PORTD3); |
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| 1612 | dongfang | 25 | DDRD &= ~(1 << DDD2); |
| 1821 | - | 26 | DDRD |= (1 << DDD3); |
| 1612 | dongfang | 27 | |
| 28 | // USART0 Baud Rate Register |
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| 29 | // set clock divider |
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| 1821 | - | 30 | UBRR1H = (uint8_t) (ubrr >> 8); |
| 31 | UBRR1L = (uint8_t) ubrr; |
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| 1612 | dongfang | 32 | |
| 33 | // enable double speed operation |
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| 34 | UCSR1A |= (1 << U2X1); |
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| 35 | // enable receiver and transmitter |
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| 36 | UCSR1B = (1 << TXEN1) | (1 << RXEN1); |
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| 2039 | - | 37 | // set asynchronous mode, no parity, 1 stop bit |
| 38 | UCSR1C &= ~((1 << UMSEL11) | (1 << UMSEL10) | (1 << UPM11) | (1 << UPM10) | (1 << USBS1)); |
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| 39 | |||
| 1612 | dongfang | 40 | // 8-bit |
| 41 | UCSR1B &= ~(1 << UCSZ12); |
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| 2039 | - | 42 | UCSR1C |= (1 << UCSZ11) | (1 << UCSZ10); |
| 1612 | dongfang | 43 | |
| 44 | // flush receive buffer explicit |
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| 1821 | - | 45 | while (UCSR1A & (1 << RXC1)) |
| 46 | UDR1; |
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| 1612 | dongfang | 47 | |
| 48 | // enable interrupts at the end |
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| 49 | // enable RX-Interrupt |
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| 50 | UCSR1B |= (1 << RXCIE1); |
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| 51 | // enable TX-Interrupt |
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| 52 | //UCSR1B |= (1 << TXCIE1); |
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| 53 | // enable DRE interrupt |
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| 54 | //UCSR1B |= (1 << UDRIE1); |
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| 55 | |||
| 56 | // restore global interrupt flags |
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| 1821 | - | 57 | SREG = sreg; |
| 1612 | dongfang | 58 | } |
| 59 | |||
| 60 | /****************************************************************/ |
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| 61 | /* USART1 data register empty ISR */ |
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| 62 | /****************************************************************/ |
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| 1645 | - | 63 | /*ISR(USART1_UDRE_vect) { |
| 1821 | - | 64 | } |
| 65 | */ |
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| 1612 | dongfang | 66 | |
| 67 | /****************************************************************/ |
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| 68 | /* USART1 transmitter ISR */ |
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| 69 | /****************************************************************/ |
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| 1645 | - | 70 | /*ISR(USART1_TX_vect) { |
| 1821 | - | 71 | } |
| 72 | */ |
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| 1612 | dongfang | 73 | /****************************************************************/ |
| 74 | /* USART1 receiver ISR */ |
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| 75 | /****************************************************************/ |
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| 2039 | - | 76 | ISR(USART1_RX_vect) { |
| 77 | ubx_parser(UDR1); // get data byte and put it into the ubx protocol parser |
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| 1612 | dongfang | 78 | } |