tmk
11 years ago
2 changed files with 18 additions and 27 deletions
+ 1
- 0
protocol/serial.h
View File
| /* host role */ | /* host role */ | ||||
| void serial_init(void); | void serial_init(void); | ||||
| uint8_t serial_recv(void); | uint8_t serial_recv(void); | ||||
| int16_t serial_recv2(void); | |||||
| void serial_send(uint8_t data); | void serial_send(uint8_t data); | ||||
| #endif | #endif |
+ 17
- 27
protocol/serial_soft.c
View File
| #define WAIT_US (1000000/SERIAL_BAUD) | #define WAIT_US (1000000/SERIAL_BAUD) | ||||
| #if 1 | |||||
| #define WAIT_TICK (1000000/SERIAL_BAUD) | |||||
| #define WAIT4(tick) _delay_us(tick) | |||||
| #else | |||||
| #define WAIT_TICK ((16000000/SERIAL_BAUD)/4 - 5) | |||||
| static inline void WAIT4(uint8_t tick) | |||||
| { | |||||
| __asm__ __volatile__ ( | |||||
| "1: dec %0" "\n\t" | |||||
| "nop" "\n\t" | |||||
| "brne 1b" | |||||
| : | |||||
| : "r" (tick) | |||||
| ); | |||||
| } | |||||
| #endif | |||||
| void serial_init(void) | void serial_init(void) | ||||
| { | { | ||||
| SERIAL_RXD_INIT(); | SERIAL_RXD_INIT(); | ||||
| return data; | return data; | ||||
| } | } | ||||
| int16_t serial_recv2(void) | |||||
| { | |||||
| uint8_t data = 0; | |||||
| if (rbuf_head == rbuf_tail) { | |||||
| return -1; | |||||
| } | |||||
| data = rbuf[rbuf_tail]; | |||||
| rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE; | |||||
| return data; | |||||
| } | |||||
| void serial_send(uint8_t data) | void serial_send(uint8_t data) | ||||
| { | { | ||||
| /* signal state: IDLE: ON, START: OFF, STOP: ON, DATA0: OFF, DATA1: ON */ | /* signal state: IDLE: ON, START: OFF, STOP: ON, DATA0: OFF, DATA1: ON */ | ||||
| #endif | #endif | ||||
| /* to center of start bit */ | /* to center of start bit */ | ||||
| //_delay_us(WAIT_US/2); | |||||
| WAIT4(WAIT_TICK/2); | |||||
| _delay_us(WAIT_US/2); | |||||
| PORTD ^= 1<<7; | PORTD ^= 1<<7; | ||||
| do { | do { | ||||
| /* to center of next bit */ | /* to center of next bit */ | ||||
| //_delay_us(WAIT_US); | |||||
| WAIT4(WAIT_TICK); | |||||
| _delay_us(WAIT_US); | |||||
| PORTD ^= 1<<7; | PORTD ^= 1<<7; | ||||
| if (SERIAL_RXD_READ()) { | if (SERIAL_RXD_READ()) { | ||||
| } while (mask); | } while (mask); | ||||
| /* to center of parity bit */ | /* to center of parity bit */ | ||||
| //_delay_us(WAIT_US); | |||||
| WAIT4(WAIT_TICK); | |||||
| _delay_us(WAIT_US); | |||||
| if (SERIAL_RXD_READ()) { parity ^= 1; } | if (SERIAL_RXD_READ()) { parity ^= 1; } | ||||
| PORTD ^= 1<<7; | PORTD ^= 1<<7; | ||||
| /* to center of stop bit */ | /* to center of stop bit */ | ||||
| //_delay_us(WAIT_US); | |||||
| WAIT4(WAIT_TICK); | |||||
| _delay_us(WAIT_US); | |||||
| uint8_t next = (rbuf_head + 1) % RBUF_SIZE; | uint8_t next = (rbuf_head + 1) % RBUF_SIZE; | ||||
| //if (parity && next != rbuf_tail) { | |||||
| if (next != rbuf_tail) { | |||||
| if (parity && next != rbuf_tail) { | |||||
| rbuf[rbuf_head] = data; | rbuf[rbuf_head] = data; | ||||
| rbuf_head = next; | rbuf_head = next; | ||||
| } | } |
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