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uart proper timeval struct restore for linux select() implementation

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This commit is contained in:
Roel Verdult 2009-11-14 00:47:11 +00:00
parent 365d60ce4a
commit 48621a7883
1 changed files with 7 additions and 2 deletions
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9
src/lib/buses/uart.c
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@ -43,7 +43,7 @@ typedef struct {
} serial_port_unix;
// Set time-out on 30 miliseconds
struct timeval tv = {
const struct timeval timeout = {
.tv_sec = 0, // 0 second
.tv_usec = 30000 // 30000 micro seconds
};
@ -182,6 +182,7 @@ bool uart_receive(const serial_port sp, byte_t* pbtRx, size_t* pszRxLen)
int res;
int byteCount;
fd_set rfds;
struct timeval tv;
// Reset the output count
*pszRxLen = 0;
@ -190,6 +191,7 @@ bool uart_receive(const serial_port sp, byte_t* pbtRx, size_t* pszRxLen)
// Reset file descriptor
FD_ZERO(&rfds);
FD_SET(((serial_port_unix*)sp)->fd,&rfds);
tv = timeout;
res = select(((serial_port_unix*)sp)->fd+1, &rfds, NULL, NULL, &tv);
// Read error
@ -210,8 +212,9 @@ bool uart_receive(const serial_port sp, byte_t* pbtRx, size_t* pszRxLen)
}
}
// Test if more bytes are coming
// Retrieve the count of the incoming bytes
res = ioctl(((serial_port_unix*)sp)->fd, FIONREAD, &byteCount);
if (res < 0) return false;
// There is something available, read the data
res = read(((serial_port_unix*)sp)->fd,pbtRx+(*pszRxLen),byteCount);
@ -231,12 +234,14 @@ bool uart_send(const serial_port sp, const byte_t* pbtTx, const size_t szTxLen)
int32_t res;
size_t szPos = 0;
fd_set rfds;
struct timeval tv;
while (szPos < szTxLen)
{
// Reset file descriptor
FD_ZERO(&rfds);
FD_SET(((serial_port_unix*)sp)->fd,&rfds);
tv = timeout;
res = select(((serial_port_unix*)sp)->fd+1, NULL, &rfds, NULL, &tv);
// Write error