projects/freertos: Use a global queue for cmd channels

The current implementation of changing the first argument to
cmd_channel_freertos_receive_packet()/cmd_channel_freertos_send_packet()
from a struct *cmd_channel (passed from
cmd_channel_receive_and_process()) to a QueueHandle_t results in seg faults.

Instead let's create a global queue that can be accessed from anywhere
to allow data to be stored.

The queue being global allows it to be accessed from interrupt service
routines (ISRs) which is generally where the data will be processed, at
least for receives.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

Author: alistair23

projects/freertos/cmd_channel_freertos.c

@@ -5,7 +5,6 @@
 #include "cmd_channel_freertos.h"
 #include "task.h"
 
-
 /**
  * Receive a packet from a command channel.
  *
@@ -16,7 +15,7 @@
  *
  * @return 0 if a packet was successfully received or an error code.
  */
-int cmd_channel_freertos_receive_packet (QueueHandle_t rx_queue, struct cmd_packet *packet,
+int cmd_channel_freertos_receive_packet (struct cmd_channel *channel, struct cmd_packet *packet,
 	int ms_timeout)
 {
 	TickType_t timeout = (ms_timeout < 0) ? portMAX_DELAY : pdMS_TO_TICKS (ms_timeout);
@@ -26,7 +25,7 @@ int cmd_channel_freertos_receive_packet (QueueHandle_t rx_queue, struct cmd_pack
 		return CMD_CHANNEL_INVALID_ARGUMENT;
 	}
 
-	status = xQueueReceive (rx_queue, packet, timeout);
+	status = xQueueReceive (I2CRequestQueue, packet, timeout);
 	if (status == pdFALSE) {
 		return CMD_CHANNEL_RX_TIMEOUT;
 	}
@@ -44,7 +43,7 @@ int cmd_channel_freertos_receive_packet (QueueHandle_t rx_queue, struct cmd_pack
  *
  * @return 0 if the packet was successfully queued or an error code.
  */
-int cmd_channel_freertos_send_packet (QueueHandle_t tx_queue, struct cmd_packet *packet,
+int cmd_channel_freertos_send_packet (struct cmd_channel *channel, struct cmd_packet *packet,
 	int ms_timeout)
 {
 	TickType_t timeout = (ms_timeout < 0) ? portMAX_DELAY : pdMS_TO_TICKS (ms_timeout);
@@ -54,7 +53,7 @@ int cmd_channel_freertos_send_packet (QueueHandle_t tx_queue, struct cmd_packet
 		return CMD_CHANNEL_INVALID_ARGUMENT;
 	}
 
-	status = xQueueSendToBack (tx_queue, packet, timeout);
+	status = xQueueSendToBack (I2CResponseQueue, packet, timeout);
 	if (status == pdFALSE) {
 		return CMD_CHANNEL_TX_TIMEOUT;
 	}

projects/freertos/cmd_channel_freertos.h

@@ -8,6 +8,8 @@
 #include "queue.h"
 #include "cmd_interface/cmd_channel.h"
 
+extern QueueHandle_t I2CRequestQueue;
+extern QueueHandle_t I2CResponseQueue;
 
 int cmd_channel_freertos_receive_packet (QueueHandle_t rx_queue, struct cmd_packet *packet,
 	int ms_timeout);