/**
* @brief Callback for data receiving
*
* The callback function provided to device driver for being notified when
* driver received a data stream.
*
* This function Must be called from interrupt context.
*
* It put the current operation to received queue and gets another operation to
* continue receiving. Then notifies rx thread to process.
*
* @param buffer Data buffer.
* @param length Received data length.
* @param error Error code when driver receiving.
* @return None.
*/
static void uart_rx_callback(uint8_t *buffer, int length, int error)
{
struct op_node *node;
int ret;
*info->rx_node->data_size = cpu_to_le16(length);
put_node_back(&info->data_queue, info->rx_node);
/* notify rx thread to process this data*/
sem_post(&info->rx_sem);
node = get_node_from(&info->free_queue);
if (!node) {
/*
* there is no free buffer, inform the rx thread to engage another uart
* receiver.
*/
info->require_node = 1;
return;
}
info->rx_node = node;
ret = device_uart_start_receiver(info->dev, node->buffer, info->rx_buf_size,
NULL, NULL, uart_rx_callback);
if (ret) {
uart_report_error(GB_UART_EVENT_PROTOCOL_ERROR, __func__);
}
}
/**
* @brief Allocate operations for receiver buffers
*
* This function is allocating operation and use them as receiving buffers.
*
* @param max_nodes Maximum nodes.
* @param buf_size Buffer size in operation.
* @param queue Target queue.
* @return 0 for success, -errno for failures.
*/
static int uart_alloc_op(int max_nodes, int buf_size, sq_queue_t *queue)
{
struct gb_operation *operation = NULL;
struct gb_uart_receive_data_request *request = NULL;
struct op_node *node = NULL;
int i = 0;
for (i = 0; i < max_nodes; i++) {
operation = gb_operation_create(info->cport,
GB_UART_PROTOCOL_RECEIVE_DATA,
sizeof(*request) + buf_size);
if (!operation) {
goto err_free_op;
}
node = malloc(sizeof(struct op_node));
if (!node) {
gb_operation_destroy(operation);
goto err_free_op;
}
node->operation = operation;
request = gb_operation_get_request_payload(operation);
node->data_size = &request->size;
node->buffer = request->data;
put_node_back(queue, node);
}
return 0;
err_free_op:
uart_free_op(queue);
return -ENOMEM;
}
/**
* @brief Data receiving process thread
*
* This function is the thread for processing data receiving tasks. When
* it wake up, it checks the receiving queue for processing the come in data.
* If protocol is running out of buffer, as soon as it gets a free buffer,
* it passes to driver for continuing the receiving.
*
* @param data The regular thread data.
* @return None.
*/
static void *uart_rx_thread(void *data)
{
struct gb_operation *operation = NULL;
struct gb_uart_receive_data_request *request = NULL;
struct buf_node *node = NULL;
struct gb_bundle *bundle = data;
struct gb_uart_info *info = bundle->priv;
struct device *dev = bundle->dev;
int ret;
while (1) {
sem_wait(&info->rx_sem);
if (info->thread_stop) {
break;
}
node = get_node_from(&info->data_queue);
if (node) {
operation = gb_operation_create(info->cport,
GB_UART_PROTOCOL_RECEIVE_DATA,
sizeof(*request) + node->data_size);
if (!operation) {
uart_report_error(GB_UART_EVENT_PROTOCOL_ERROR, __func__);
} else {
request = gb_operation_get_request_payload(operation);
request->size = cpu_to_le16(node->data_size);
request->flags = node->data_flags;
memcpy(request->data, node->buffer, node->data_size);
ret = gb_operation_send_request(operation, NULL, false);
if (ret) {
uart_report_error(GB_UART_EVENT_PROTOCOL_ERROR, __func__);
}
gb_operation_destroy(operation);
}
put_node_back(&info->free_queue, node);
}
/*
* In case there is no free node in callback.
*/
if (info->require_node) {
node = get_node_from(&info->free_queue);
info->rx_node = node;
ret = device_uart_start_receiver(dev, node->buffer,
info->rx_buf_size, NULL,
NULL, uart_rx_callback);
if (ret) {
uart_report_error(GB_UART_EVENT_DEVICE_ERROR, __func__);
}
info->require_node = 0;
}
}
return NULL;
}
/**
* @brief Callback for data receiving
*
* The callback function provided to device driver for being notified when
* driver received a data stream.
*
* This function Must be called from interrupt context.
*
* It put the current buffer to received queue and gets another buffer to
* continue receiving. Then notifies rx thread to process.
*
* @param dev Pointer to the UART device controller
* @param data Pointer to struct gb_uart_info.
* @param buffer Data buffer.
* @param length Received data length.
* @param error Error code when driver receiving.
* @return None.
*/
static void uart_rx_callback(struct device *dev, void *data, uint8_t *buffer,
int length, int error)
{
struct gb_uart_info *info;
struct buf_node *node;
int ret;
uint8_t flags = 0;
DEBUGASSERT(data);
info = data;
info->rx_node->data_size = length;
if (error & LSR_OE) {
flags |= GB_UART_RECV_FLAG_OVERRUN;
}
if (error & LSR_PE) {
flags |= GB_UART_RECV_FLAG_PARITY;
}
if (error & LSR_FE) {
flags |= GB_UART_RECV_FLAG_FRAMING;
}
if (error & LSR_BI) {
flags |= GB_UART_RECV_FLAG_BREAK;
}
info->rx_node->data_flags = flags;
put_node_back(&info->data_queue, info->rx_node);
/* notify rx thread to process this data*/
sem_post(&info->rx_sem);
node = get_node_from(&info->free_queue);
if (!node) {
/*
* there is no free buffer, inform the rx thread to engage another uart
* receiver.
*/
info->require_node = 1;
return;
}
info->rx_node = node;
ret = device_uart_start_receiver(dev, node->buffer,
info->rx_buf_size,
NULL, NULL, uart_rx_callback);
if (ret) {
uart_report_error(GB_UART_EVENT_PROTOCOL_ERROR, __func__);
}
}
/**
* @brief Allocate receiver buffers
*
* This function is allocating receiving buffers.
*
* @param max_nodes Maximum nodes.
* @param buf_size Buffer size in operation.
* @param queue Target queue.
* @return 0 for success, errno for failures.
*/
static int uart_alloc_buf(int max_nodes, int buf_size, sq_queue_t *queue)
{
struct buf_node *node = NULL;
int i = 0;
for (i = 0; i < max_nodes; i++) {
node = malloc(sizeof(*node) + buf_size);
if (!node) {
/*
* It may have some buffers already be allocated, caller should
* free them.
*/
return ENOMEM;
/* Keeping consistency with Nuttx APIs, so returns positive num */
}
put_node_back(queue, node);
}
return 0;
}
/**
* @brief Data receiving process thread
*
* This function is the thread for processing data receiving tasks. When
* it wake up, it checks the receiving queue for processing the come in data.
* If protocol is running out of operation, once it gets a free operation,
* it passes to driver for continuing the receiving.
*
* @param data The regular thread data.
* @return None.
*/
static void *uart_rx_thread(void *data)
{
struct op_node *node = NULL;
int ret;
while (1) {
sem_wait(&info->rx_sem);
if (info->thread_stop) {
break;
}
node = get_node_from(&info->data_queue);
if (node) {
ret = gb_operation_send_request(node->operation, NULL, false);
if (ret) {
uart_report_error(GB_UART_EVENT_PROTOCOL_ERROR, __func__);
}
put_node_back(&info->free_queue, node);
}
/*
* In case there is no free node in callback.
*/
if (info->require_node) {
node = get_node_from(&info->free_queue);
info->rx_node = node;
ret = device_uart_start_receiver(info->dev, node->buffer,
info->rx_buf_size, NULL, NULL,
uart_rx_callback);
if (ret) {
uart_report_error(GB_UART_EVENT_DEVICE_ERROR, __func__);
}
info->require_node = 0;
}
}
return NULL;
}
