extern int32_t ciaaSerialDevices_read(ciaaDevices_deviceType const * const device, uint8_t * const buf, uint32_t nbyte)
{
/* get serial device */
ciaaSerialDevices_deviceType * serialDevice =
(ciaaSerialDevices_deviceType*) device->layer;
int32_t ret = 0;
/* if the rx buffer is not empty */
if (!ciaaLibs_circBufEmpty(&serialDevice->rxBuf))
{
/* try to read nbyte from rxBuf and store it to the user buffer */
ret = ciaaLibs_circBufGet(&serialDevice->rxBuf,
buf,
nbyte);
}
else
{
/* There aren't data */
if(serialDevice->flags & ciaaSerialDevices_NONBLOCK_MODE)
{
/* We are in non blocking mode */
/* We should do a blocking call...*/
ciaaPOSIX_errno = EAGAIN; /* shall return -1 and set errno to [EAGAIN]. */
ret = -1;
}
else
{
/* We are in blocking mode */
/* TODO improve this: https://github.com/ciaa/Firmware/issues/88 */
serialDevice->device->ioctl(device->loLayer, ciaaPOSIX_IOCTL_SET_ENABLE_RX_INTERRUPT, (void*)false);
/* get task id and function for waking up the task later */
GetTaskID(&serialDevice->blocked.taskID);
serialDevice->blocked.fct = (void*) ciaaSerialDevices_read;
/* TODO improve this: https://github.com/ciaa/Firmware/issues/88 */
serialDevice->device->ioctl(device->loLayer, ciaaPOSIX_IOCTL_SET_ENABLE_RX_INTERRUPT, (void*)true);
/* if no data wait for it */
#ifdef POSIXE
WaitEvent(POSIXE);
ClearEvent(POSIXE);
#endif
/* after the wait is not needed to check if data is avaibale on the
* buffer. The event will be set first after adding some data into it */
/* try to read nbyte from rxBuf and store it to the user buffer */
ret = ciaaLibs_circBufGet(&serialDevice->rxBuf,
buf,
nbyte);
}
}
return ret;
}
/** \brief test ciaaLibs_circBufEmpty and ciaaLibs_circBufFull
**/
void test_ciaaLibs_circBufEmptyFull(void) {
ciaaLibs_CircBufType * cbuf;
size_t ret;
char * from = "0hallo123-10HALLO12-20hallo12-30HALLO12-40HALLO12-50hallo12-60-4";
/*0123456789012345678901234567890123456789012345678901234567890123*/
char to[100];
/* use linux malloc, free and memcpy */
ciaaPOSIX_malloc_StubWithCallback(malloc);
ciaaPOSIX_memcpy_StubWithCallback(memcpy);
ciaaPOSIX_free_StubWithCallback(free);
/* creates a cicular buffer with 64 bytes */
cbuf = ciaaLibs_circBufNew(64);
TEST_ASSERT_TRUE(NULL != cbuf);
/* buffer is empty */
TEST_ASSERT_TRUE(ciaaLibs_circBufEmpty(cbuf));
TEST_ASSERT_FALSE(ciaaLibs_circBufFull(cbuf));
ciaaLibs_circBufPut(cbuf, (void*)from, 10);
/* buffer is not empty neither full */
TEST_ASSERT_FALSE(ciaaLibs_circBufEmpty(cbuf));
TEST_ASSERT_FALSE(ciaaLibs_circBufFull(cbuf));
ciaaLibs_circBufPut(cbuf, (void*)from, 53);
/* buffer is full */
TEST_ASSERT_FALSE(ciaaLibs_circBufEmpty(cbuf));
TEST_ASSERT_TRUE(ciaaLibs_circBufFull(cbuf));
ciaaLibs_circBufGet(cbuf, to, 30);
/* buffer is not empty neither full */
TEST_ASSERT_FALSE(ciaaLibs_circBufEmpty(cbuf));
TEST_ASSERT_FALSE(ciaaLibs_circBufFull(cbuf));
ciaaLibs_circBufPut(cbuf, from, 30);
/* buffer is full */
TEST_ASSERT_FALSE(ciaaLibs_circBufEmpty(cbuf));
TEST_ASSERT_TRUE(ciaaLibs_circBufFull(cbuf));
ciaaLibs_circBufGet(cbuf, to, 63);
/* buffer is empty */
TEST_ASSERT_TRUE(ciaaLibs_circBufEmpty(cbuf));
TEST_ASSERT_FALSE(ciaaLibs_circBufFull(cbuf));
/* release buffer */
ciaaLibs_circBufRel(cbuf);
}
