[457] | 1 | /* Author: Magnus Ivarsson <magnus.ivarsson@volvo.com> */
|
---|
| 2 |
|
---|
| 3 | /* ---------------------------------------------- */
|
---|
| 4 | /* --- fifo 4 unix ------------------------------ */
|
---|
| 5 | /* ---------------------------------------------- */
|
---|
| 6 | #include "lwip/err.h"
|
---|
| 7 | #include "netif/fifo.h"
|
---|
| 8 | #include "lwip/debug.h"
|
---|
| 9 | #include "lwip/def.h"
|
---|
| 10 | #include "lwip/sys.h"
|
---|
| 11 | #include "lwip/arch.h"
|
---|
| 12 | #include <unistd.h>
|
---|
| 13 |
|
---|
| 14 | #ifndef TRUE
|
---|
| 15 | #define TRUE 1
|
---|
| 16 | #endif
|
---|
| 17 | #ifndef FALSE
|
---|
| 18 | #define FALSE 0
|
---|
| 19 | #endif
|
---|
| 20 |
|
---|
| 21 | #ifndef SIO_FIFO_DEBUG
|
---|
| 22 | #define SIO_FIFO_DEBUG LWIP_DBG_OFF
|
---|
| 23 | #endif
|
---|
| 24 |
|
---|
| 25 | u8_t fifoGet(fifo_t * fifo)
|
---|
| 26 | {
|
---|
| 27 | u8_t c;
|
---|
| 28 |
|
---|
| 29 | sys_sem_wait(&fifo->sem); /* enter critical section */
|
---|
| 30 |
|
---|
| 31 | if (fifo->dataslot == fifo->emptyslot)
|
---|
| 32 | {
|
---|
| 33 | fifo->getWaiting = TRUE; /* tell putFifo to signal us when data is available */
|
---|
| 34 | sys_sem_signal(&fifo->sem); /* leave critical section (allow input from serial port..) */
|
---|
| 35 | sys_sem_wait(&fifo->getSem); /* wait 4 data */
|
---|
| 36 | sys_sem_wait(&fifo->sem); /* reenter critical section */
|
---|
| 37 | }
|
---|
| 38 |
|
---|
| 39 | c = fifo->data[fifo->dataslot++];
|
---|
| 40 | fifo->len--;
|
---|
| 41 |
|
---|
| 42 | if (fifo->dataslot == FIFOSIZE)
|
---|
| 43 | {
|
---|
| 44 | fifo->dataslot = 0;
|
---|
| 45 | }
|
---|
| 46 | sys_sem_signal(&fifo->sem); /* leave critical section */
|
---|
| 47 | return c;
|
---|
| 48 | }
|
---|
| 49 |
|
---|
| 50 |
|
---|
| 51 | s16_t fifoGetNonBlock(fifo_t * fifo)
|
---|
| 52 | {
|
---|
| 53 | u16_t c;
|
---|
| 54 |
|
---|
| 55 | sys_sem_wait(&fifo->sem); /* enter critical section */
|
---|
| 56 |
|
---|
| 57 | if (fifo->dataslot == fifo->emptyslot)
|
---|
| 58 | {
|
---|
| 59 | /* empty fifo */
|
---|
| 60 | c = -1;
|
---|
| 61 | }
|
---|
| 62 | else
|
---|
| 63 | {
|
---|
| 64 | c = fifo->data[fifo->dataslot++];
|
---|
| 65 | fifo->len--;
|
---|
| 66 |
|
---|
| 67 | if (fifo->dataslot == FIFOSIZE)
|
---|
| 68 | {
|
---|
| 69 | fifo->dataslot = 0;
|
---|
| 70 | }
|
---|
| 71 | }
|
---|
| 72 | sys_sem_signal(&fifo->sem); /* leave critical section */
|
---|
| 73 | return c;
|
---|
| 74 | }
|
---|
| 75 |
|
---|
| 76 |
|
---|
| 77 | void fifoPut(fifo_t * fifo, int fd)
|
---|
| 78 | {
|
---|
| 79 | /* FIXME: mutex around struct data.. */
|
---|
| 80 | int cnt=0;
|
---|
| 81 |
|
---|
| 82 | sys_sem_wait(&fifo->sem ); /* enter critical */
|
---|
| 83 |
|
---|
| 84 | LWIP_DEBUGF( SIO_FIFO_DEBUG,("fifoput: len%d dat%d empt%d --> ", fifo->len, fifo->dataslot, fifo->emptyslot ) );
|
---|
| 85 |
|
---|
| 86 | if ( fifo->emptyslot < fifo->dataslot )
|
---|
| 87 | {
|
---|
| 88 | cnt = read( fd, &fifo->data[fifo->emptyslot], fifo->dataslot - fifo->emptyslot );
|
---|
| 89 | }
|
---|
| 90 | else
|
---|
| 91 | {
|
---|
| 92 | cnt = read( fd, &fifo->data[fifo->emptyslot], FIFOSIZE-fifo->emptyslot );
|
---|
| 93 | }
|
---|
| 94 | fifo->emptyslot += cnt;
|
---|
| 95 | fifo->len += cnt;
|
---|
| 96 |
|
---|
| 97 | LWIP_DEBUGF( SIO_FIFO_DEBUG,("len%d dat%d empt%d\n", fifo->len, fifo->dataslot, fifo->emptyslot ) );
|
---|
| 98 |
|
---|
| 99 | if ( fifo->len > FIFOSIZE )
|
---|
| 100 | {
|
---|
| 101 | printf( "ERROR: fifo overrun detected len=%d, flushing\n", fifo->len );
|
---|
| 102 | fifo->dataslot = 0;
|
---|
| 103 | fifo->emptyslot = 0;
|
---|
| 104 | fifo->len = 0;
|
---|
| 105 | }
|
---|
| 106 |
|
---|
| 107 | if ( fifo->emptyslot == FIFOSIZE )
|
---|
| 108 | {
|
---|
| 109 | fifo->emptyslot = 0;
|
---|
| 110 | LWIP_DEBUGF( SIO_FIFO_DEBUG, ("(WRAP) ") );
|
---|
| 111 |
|
---|
| 112 | sys_sem_signal(&fifo->sem ); /* leave critical */
|
---|
| 113 | fifoPut( fifo, fd );
|
---|
| 114 | return;
|
---|
| 115 | }
|
---|
| 116 | if ( fifo->getWaiting )
|
---|
| 117 | {
|
---|
| 118 | fifo->getWaiting = FALSE;
|
---|
| 119 | sys_sem_signal(&fifo->getSem );
|
---|
| 120 | }
|
---|
| 121 |
|
---|
| 122 | sys_sem_signal(&fifo->sem ); /* leave critical */
|
---|
| 123 | return;
|
---|
| 124 | }
|
---|
| 125 |
|
---|
| 126 |
|
---|
| 127 | void fifoInit(fifo_t * fifo)
|
---|
| 128 | {
|
---|
| 129 | fifo->dataslot = 0;
|
---|
| 130 | fifo->emptyslot = 0;
|
---|
| 131 | fifo->len = 0;
|
---|
| 132 | if(sys_sem_new(&fifo->sem, 1) != ERR_OK) { /* critical section 1=free to enter */
|
---|
| 133 | LWIP_ASSERT("Failed to create semaphore", 0);
|
---|
| 134 | }
|
---|
| 135 | if(sys_sem_new(&fifo->getSem, 0) != ERR_OK) { /* 0 = no one waiting */
|
---|
| 136 | LWIP_ASSERT("Failed to create semaphore", 0);
|
---|
| 137 | }
|
---|
| 138 | fifo->getWaiting = FALSE;
|
---|
| 139 | }
|
---|