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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 112 | mikeljo | 1 | |
| 2 | #include <avr/io.h> |
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| 3 | #include <inttypes.h> |
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| 4 | #include <stdlib.h> |
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| 5 | #include <avr/interrupt.h> |
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| 6 | #include "main.h" |
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| 7 | #include "rs232.h" |
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| 8 | |||
| 9 | volatile uint8_t read_index, write_index; |
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| 10 | volatile uint8_t rs232_buffer[16]; |
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| 11 | |||
| 12 | ISR(USART_RXC_vect) |
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| 13 | { |
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| 14 | rs232_buffer[write_index++] = UDR; |
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| 15 | write_index &= 15; |
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| 16 | } |
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| 17 | |||
| 18 | void RS232_init (void) |
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| 19 | { |
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| 20 | UCSRB = (1<<RXEN)|(1<<TXEN)|(1<<RXCIE); |
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| 21 | // UBRRL = 7; // 57600 Baud @ 7,372800 MHz |
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| 114 | mikeljo | 22 | // UBRR = 7; // 57600 Baud @ 7,372800 MHz |
| 23 | |||
| 24 | UBRR=(F_CPU / (BAUD_RATE * 16L) - 1); |
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| 112 | mikeljo | 25 | } |
| 26 | |||
| 27 | uint8_t RS232_get (void) |
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| 28 | { |
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| 29 | uint8_t c; |
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| 30 | |||
| 31 | rs232_timer = 10; |
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| 32 | |||
| 33 | while ((read_index == write_index) && (rs232_timer > 0)); |
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| 34 | if (rs232_timer != 0) |
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| 35 | { |
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| 36 | c = rs232_buffer[read_index++]; |
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| 37 | read_index &= 15; |
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| 38 | } |
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| 39 | else |
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| 40 | { |
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| 41 | c=0; |
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| 42 | } |
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| 43 | return c; |
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| 44 | } |
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| 45 | void RS232_send (uint8_t data) |
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| 46 | { |
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| 47 | // while ((UCSRA & (1<<UDRE)) == 0); |
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| 48 | while ((USR & (1<<UDRE)) == 0); |
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| 49 | UDR = data; |
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| 50 | } |
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| 51 | void RS232_text (uint8_t *text) |
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| 52 | { |
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| 53 | while (*text) |
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| 54 | { |
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| 55 | RS232_send(*text); |
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| 56 | text++; |
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| 57 | } |
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| 58 | } |
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| 59 | |||
| 60 |