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Async io work

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This commit is contained in:
Mark Qvist 2019-01-08 20:56:58 +01:00
parent 42dcd121cc
commit 06d138d66c
11 changed files with 246 additions and 94 deletions
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6
device.h
View File

@ -20,11 +20,17 @@
#define BAUD 115200
#define SERIAL_DEBUG false
#define TX_MAXWAIT 2UL
#define CONFIG_QUEUE_SIZE 7500
#define CONFIG_QUEUE_MAX_LENGTH 15
#define CONFIG_SERIAL_BUFFER_SIZE 1532 // TODO: Tune this, what is actually required?
// CSMA Settings
#define CONFIG_FULL_DUPLEX false // TODO: Actually implement fdx
#define CONFIG_CSMA_P 255
#define AX25_MIN_FRAME_LEN 1
#define AX25_MAX_FRAME_LEN 1532
// Packet settings
#define CONFIG_PASSALL false

24
hardware/AFSK.c
View File

@ -1,6 +1,7 @@
#include <string.h>
#include "AFSK.h"
#include "util/time.h"
#include "protocol/KISS.h"
// TODO: Remove testing vars ////
#define SAMPLES_TO_CAPTURE 128
@ -624,27 +625,4 @@ ISR(ADC_vect) {
}
++_clock;
/*
// TODO: Remove these debug sample collection functions
//DAC_PORT ^= 0xFF;
//DAC_PORT = ADCH;
if (capturedsamples == SAMPLES_TO_CAPTURE) {
printf("--- Dumping samples ---");
for (ticks_t i = 0; i < SAMPLES_TO_CAPTURE; i++) {
uint8_t c = samplebuf[i];
printf("%d\r\n", c);
}
printf("-------- Done ---------");
}
DAC_PORT ^= 0xFF;
if (capturedsamples < SAMPLES_TO_CAPTURE) {
samplebuf[capturedsamples++] = ADCH;
// Clear Input Capture Flag from Timer1 Interrupt Flag Register
// to allow for next capture interrupt to occur
TIFR1 = _BV(ICF1);
}
*/
}

6
hardware/AFSK.h
View File

@ -39,7 +39,7 @@ inline static uint8_t sinSample(uint16_t i) {
#define CPU_FREQ F_CPU
#define BITRATE 1200
#define BITRATE 2400
#if BITRATE == 300
#define CONFIG_ADC_SAMPLERATE 9600UL
@ -53,8 +53,8 @@ inline static uint8_t sinSample(uint16_t i) {
#endif
#define CONFIG_AFSK_RX_BUFLEN CONFIG_ADC_SAMPLERATE/75
#define CONFIG_AFSK_TX_BUFLEN CONFIG_ADC_SAMPLERATE/75
#define CONFIG_AFSK_RX_BUFLEN AX25_MAX_FRAME_LEN
#define CONFIG_AFSK_TX_BUFLEN AX25_MAX_FRAME_LEN
#define CONFIG_AFSK_RXTIMEOUT 0
#define CONFIG_AFSK_PREAMBLE_LEN 150UL

15
hardware/Serial.c
View File

@ -5,6 +5,8 @@
void serial_init(Serial *serial) {
memset(serial, 0, sizeof(*serial));
memset(serialBuf, 0, sizeof(serialBuf));
UBRR0H = UBRRH_VALUE;
UBRR0L = UBRRL_VALUE;
@ -14,13 +16,15 @@ void serial_init(Serial *serial) {
UCSR0A &= ~(_BV(U2X0));
#endif
// Set to 8-bit data, enable RX and TX
// Set to 8-bit data, enable RX and TX, enable receive interrupt
UCSR0C = _BV(UCSZ01) | _BV(UCSZ00);
UCSR0B = _BV(RXEN0) | _BV(TXEN0);
UCSR0B = _BV(RXEN0) | _BV(TXEN0) | _BV(RXCIE0);
FILE uart0_fd = FDEV_SETUP_STREAM(uart0_putchar, uart0_getchar, _FDEV_SETUP_RW);
serial->uart0 = uart0_fd;
fifo_init(&serialFIFO, serialBuf, sizeof(serialBuf));
}
bool serial_available(uint8_t index) {
@ -46,3 +50,10 @@ char uart0_getchar_nowait(void) {
if (!(UCSR0A & _BV(RXC0))) return EOF;
return UDR0;
}
ISR(USART0_RX_vect) {
if (serial_available(0)) {
char c = uart0_getchar_nowait();
fifo_push(&serialFIFO, c);
}
}

4
hardware/Serial.h
View File

@ -6,11 +6,15 @@
#include <stdio.h>
#include <stdbool.h>
#include <avr/io.h>
#include "util/FIFO.h"
typedef struct Serial {
FILE uart0;
} Serial;
FIFOBuffer serialFIFO;
uint8_t serialBuf[CONFIG_SERIAL_BUFFER_SIZE];
void serial_init(Serial *serial);
bool serial_available(uint8_t index);
int uart0_putchar(char c, FILE *stream);

7
main.c
View File

@ -38,11 +38,8 @@ int main (void) {
while (true) {
ax25_poll(&AX25);
if (serial_available(0)) {
char sbyte = uart0_getchar_nowait();
kiss_serialCallback(sbyte);
}
kiss_poll();
kiss_csma();
}
return(0);

8
protocol/AX25.c
View File

@ -5,7 +5,8 @@
#include "AX25.h"
#include "protocol/HDLC.h"
#include "util/CRC-CCIT.h"
#include "../hardware/AFSK.h"
#include "hardware/AFSK.h"
#include "protocol/KISS.h"
#define countof(a) sizeof(a)/sizeof(a[0])
#define MIN(a,b) ({ typeof(a) _a = (a); typeof(b) _b = (b); ((typeof(_a))((_a < _b) ? _a : _b)); })
@ -76,7 +77,10 @@ void ax25_sendRaw(AX25Ctx *ctx, void *_buf, size_t len) {
ctx->crc_out = CRC_CCIT_INIT_VAL;
fputc(HDLC_FLAG, ctx->ch);
const uint8_t *buf = (const uint8_t *)_buf;
while (len--) ax25_putchar(ctx, *buf++);
while (len--) {
ax25_putchar(ctx, *buf++);
kiss_poll();
}
uint8_t crcl = (ctx->crc_out & 0xff) ^ 0xff;
uint8_t crch = (ctx->crc_out >> 8) ^ 0xff;

4
protocol/AX25.h
View File

@ -6,10 +6,6 @@
#include "device.h"
#include "hardware/AFSK.h"
#define AX25_MIN_FRAME_LEN 1
#define AX25_MAX_FRAME_LEN 1532
#define AX25_CRC_CORRECT 0xF0B8
#define AX25_CTRL_UI 0x03

169
protocol/KISS.c
View File

@ -2,16 +2,29 @@
#include <string.h>
#include "device.h"
#include "hardware/Serial.h"
#include "util/FIFO16.h"
#include "KISS.h"
static uint8_t serialBuffer[AX25_MAX_FRAME_LEN]; // Buffer for holding incoming serial data
uint8_t packet_queue[CONFIG_QUEUE_SIZE];
uint8_t tx_buffer[AX25_MAX_FRAME_LEN];
volatile uint8_t queue_height = 0;
volatile size_t queued_bytes = 0;
volatile size_t queue_cursor = 0;
volatile size_t current_packet_start = 0;
FIFOBuffer16 packet_starts;
size_t packet_starts_buf[CONFIG_QUEUE_MAX_LENGTH+1];
FIFOBuffer16 packet_lengths;
size_t packet_lengths_buf[CONFIG_QUEUE_MAX_LENGTH+1];
AX25Ctx *ax25ctx;
Afsk *channel;
Serial *serial;
size_t frame_len;
bool IN_FRAME;
bool ESCAPE;
bool FLOWCONTROL;
uint8_t command = CMD_UNKNOWN;
unsigned long custom_preamble = CONFIG_AFSK_PREAMBLE_LEN;
@ -24,7 +37,20 @@ void kiss_init(AX25Ctx *ax25, Afsk *afsk, Serial *ser) {
ax25ctx = ax25;
serial = ser;
channel = afsk;
FLOWCONTROL = false;
memset(packet_queue, 0, sizeof(packet_queue));
memset(packet_starts_buf, 0, sizeof(packet_starts));
memset(packet_lengths_buf, 0, sizeof(packet_lengths));
fifo16_init(&packet_starts, packet_starts_buf, sizeof(packet_starts_buf));
fifo16_init(&packet_lengths, packet_lengths_buf, sizeof(packet_lengths_buf));
}
void kiss_poll(void) {
while (!fifo_isempty_locked(&serialFIFO)) {
char sbyte = fifo_pop_locked(&serialFIFO);
kiss_serialCallback(sbyte);
}
}
// TODO: Remove debug functions
@ -51,60 +77,95 @@ void kiss_messageCallback(AX25Ctx *ctx) {
}
void kiss_csma(AX25Ctx *ctx, uint8_t *buf, size_t len) {
bool sent = false;
// TODO: Determine if this is to be removed
// if (CONFIG_AFSK_TXWAIT > 0) {
// ticks_t wait_start = timer_clock();
// long wait_ticks = ms_to_ticks(CONFIG_AFSK_TXWAIT);
// while (timer_clock() - wait_start < wait_ticks) {
// cpu_relax();
// }
// }
while (!sent) {
if(CONFIG_FULL_DUPLEX || !channel->hdlc.dcd) {
uint8_t tp = rand() & 0xFF;
if (tp < p) {
ax25_sendRaw(ctx, buf, len);
sent = true;
void kiss_csma(void) {
if (queue_height > 0) {
if (!channel->hdlc.dcd) {
if (p == 255) {
kiss_flushQueue();
} else {
ticks_t start = timer_clock();
long slot_ticks = ms_to_ticks(slotTime);
while (timer_clock() - start < slot_ticks) {
cpu_relax();
}
}
} else {
while (!sent && channel->hdlc.receiving) {
// Continously poll the modem for data
// while waiting, so we don't overrun
// receive buffers
ax25_poll(ax25ctx);
if (channel->status != 0) {
// If an overflow or other error
// occurs, we'll back off and drop
// this packet silently.
channel->status = 0;
sent = true;
// TODO: Implement real CSMA
}
}
}
}
if (FLOWCONTROL) {
while (!ctx->ready_for_data) { /* Wait */ }
fputc(FEND, &serial->uart0);
fputc(CMD_READY, &serial->uart0);
fputc(0x01, &serial->uart0);
fputc(FEND, &serial->uart0);
// TODO: Remove this
void kiss_flushQueueDebug(void) {
printf("Queue height %d\r\n", queue_height);
for (size_t n = 0; n < queue_height; n++) {
size_t start = fifo16_pop(&packet_starts);
size_t length = fifo16_pop(&packet_lengths);
printf("--- Packet %d, %d bytes ---\r\n", n+1, length);
for (size_t i = 0; i < length; i++) {
size_t pos = (start+i)%CONFIG_QUEUE_SIZE;
printf("%02x", packet_queue[pos]);
}
printf("\r\n\r\n");
}
queue_height = 0;
queued_bytes = 0;
}
volatile bool queue_flushing = false;
void kiss_flushQueue(void) {
if (!queue_flushing) {
queue_flushing = true;
size_t processed = 0;
for (size_t n = 0; n < queue_height; n++) {
size_t start = fifo16_pop_locked(&packet_starts);
size_t length = fifo16_pop_locked(&packet_lengths);
kiss_poll();
for (size_t i = 0; i < length; i++) {
size_t pos = (start+i)%CONFIG_QUEUE_SIZE;
tx_buffer[i] = packet_queue[pos];
}
ax25_sendRaw(ax25ctx, tx_buffer, length);
processed++;
}
if (processed < queue_height) {
while (true) {
LED_TX_ON();
LED_RX_ON();
}
}
printf("Processed %d\r\n", processed);
queue_height = 0;
queued_bytes = 0;
queue_flushing = false;
}
}
uint8_t kiss_queuedPackets(void) {
return 0;
}
bool kiss_queueIsFull(void) {
return false;
}
void kiss_serialCallback(uint8_t sbyte) {
if (IN_FRAME && sbyte == FEND && command == CMD_DATA) {
IN_FRAME = false;
kiss_csma(ax25ctx, serialBuffer, frame_len);
if (queue_height < CONFIG_QUEUE_MAX_LENGTH && queued_bytes < CONFIG_QUEUE_SIZE) {
queue_height++;
size_t s = current_packet_start;
size_t e = queue_cursor-1; if (e == -1) e = CONFIG_QUEUE_SIZE-1;
size_t l = (s < e) ? e - s + 1 : CONFIG_QUEUE_SIZE - s + e + 1;
fifo16_push_locked(&packet_starts, s);
fifo16_push_locked(&packet_lengths, l);
current_packet_start = queue_cursor;
printf("Queue height %d\r\n", queue_height);
}
} else if (sbyte == FEND) {
IN_FRAME = true;
command = CMD_UNKNOWN;
@ -116,6 +177,7 @@ void kiss_serialCallback(uint8_t sbyte) {
// strip off the port nibble of the command byte
sbyte = sbyte & 0x0F;
command = sbyte;
if (command == CMD_DATA) current_packet_start = queue_cursor;
} else if (command == CMD_DATA) {
if (sbyte == FESC) {
ESCAPE = true;
@ -125,7 +187,11 @@ void kiss_serialCallback(uint8_t sbyte) {
if (sbyte == TFESC) sbyte = FESC;
ESCAPE = false;
}
serialBuffer[frame_len++] = sbyte;
if (queue_height < CONFIG_QUEUE_MAX_LENGTH && queued_bytes < CONFIG_QUEUE_SIZE) {
queued_bytes++;
packet_queue[queue_cursor++] = sbyte;
if (queue_cursor == CONFIG_QUEUE_SIZE) queue_cursor = 0;
}
}
} else if (command == CMD_TXDELAY) {
custom_preamble = sbyte * 10UL;
@ -135,12 +201,11 @@ void kiss_serialCallback(uint8_t sbyte) {
slotTime = sbyte * 10;
} else if (command == CMD_P) {
p = sbyte;
} else if (command == CMD_READY) {
if (sbyte == 0x00) {
FLOWCONTROL = false;
} else {
FLOWCONTROL = true;
}
} else if (command == CMD_FLUSHQUEUE) {
kiss_flushQueue();
// TODO: Remove this
} else if (command == CMD_FLUSHQUEUE_DEBUG) {
kiss_flushQueueDebug();
}
}

6
protocol/KISS.h
View File

@ -19,12 +19,16 @@
#define CMD_TXTAIL 0x04
#define CMD_FULLDUPLEX 0x05
#define CMD_SETHARDWARE 0x06
#define CMD_FLUSHQUEUE 0x07
#define CMD_FLUSHQUEUE_DEBUG 0x08
#define CMD_READY 0x0F
#define CMD_RETURN 0xFF
void kiss_init(AX25Ctx *ax25, Afsk *afsk, Serial *ser);
void kiss_csma(AX25Ctx *ctx, uint8_t *buf, size_t len);
void kiss_messageCallback(AX25Ctx *ctx);
void kiss_serialCallback(uint8_t sbyte);
void kiss_flushQueue(void);
void kiss_csma(void);
void kiss_poll(void);
#endif

87
util/FIFO16.h Normal file
View File

@ -0,0 +1,87 @@
#ifndef UTIL_FIFO16_H
#define UTIL_FIFO16_H
#include <stdio.h>
#include <stddef.h>
#include <stdbool.h>
#include <util/atomic.h>
typedef struct FIFOBuffer16
{
size_t *begin;
size_t *end;
size_t * volatile head;
size_t * volatile tail;
} FIFOBuffer16;
inline bool fifo16_isempty(const FIFOBuffer16 *f) {
return f->head == f->tail;
}
inline bool fifo16_isfull(const FIFOBuffer16 *f) {
return ((f->head == f->begin) && (f->tail == f->end)) || (f->tail == f->head - 1);
}
inline void fifo16_push(FIFOBuffer16 *f, size_t c) {
*(f->tail) = c;
if (f->tail == f->end) {
f->tail = f->begin;
} else {
f->tail++;
}
}
inline size_t fifo16_pop(FIFOBuffer16 *f) {
if(f->head == f->end) {
f->head = f->begin;
return *(f->end);
} else {
return *(f->head++);
}
}
inline void fifo16_flush(FIFOBuffer16 *f) {
f->head = f->tail;
}
static inline bool fifo16_isempty_locked(const FIFOBuffer16 *f) {
bool result;
ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
result = fifo16_isempty(f);
}
return result;
}
static inline bool fifo16_isfull_locked(const FIFOBuffer16 *f) {
bool result;
ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
result = fifo16_isfull(f);
}
return result;
}
static inline void fifo16_push_locked(FIFOBuffer16 *f, size_t c) {
ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
fifo16_push(f, c);
}
}
static inline size_t fifo16_pop_locked(FIFOBuffer16 *f) {
size_t c;
ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
c = fifo16_pop(f);
}
return c;
}
inline void fifo16_init(FIFOBuffer16 *f, size_t *buffer, size_t size) {
f->head = f->tail = f->begin = buffer;
f->end = buffer + (size/sizeof(size_t)) - 2;
}
inline size_t fifo16_len(FIFOBuffer16 *f) {
return ((f->end - f->begin))/sizeof(size_t);
}
#endif