1 files changed, 66 insertions, 0 deletions
diff --git a/code/fe310/eos/msgq.c b/code/fe310/eos/msgq.c
new file mode 100644
index 0000000..d242c69
--- /dev/null
+++ b/code/fe310/eos/msgq.c
@@ -0,0 +1,66 @@
+#include <stddef.h>
+
+#include "eos.h"
+#include "msgq.h"
+
+#define EOS_MSGQ_IDX_MASK(IDX, SIZE)  ((IDX) & ((SIZE) - 1))
+
+void eos_msgq_init(EOSMsgQ *msgq, EOSMsgItem *array, uint8_t size) {
+    msgq->idx_r = 0;
+    msgq->idx_w = 0;
+    msgq->array = array;
+    msgq->size = size;
+}
+
+int eos_msgq_push(EOSMsgQ *msgq, unsigned char cmd, unsigned char *buffer, uint16_t len) {
+    if (msgq->idx_w - msgq->idx_r == msgq->size) return EOS_ERR_Q_FULL;
+
+    uint8_t idx = EOS_MSGQ_IDX_MASK(msgq->idx_w, msgq->size);
+    msgq->array[idx].cmd = cmd;
+    msgq->array[idx].buffer = buffer;
+    msgq->array[idx].len = len;
+    msgq->idx_w++;
+    return EOS_OK;
+}
+
+void eos_msgq_pop(EOSMsgQ *msgq, unsigned char *cmd, unsigned char **buffer, uint16_t *len) {
+    if (msgq->idx_r == msgq->idx_w) {
+        *cmd = 0;
+        *buffer = NULL;
+    } else {
+        uint8_t idx = EOS_MSGQ_IDX_MASK(msgq->idx_r, msgq->size);
+        *cmd = msgq->array[idx].cmd;
+        *buffer = msgq->array[idx].buffer;
+        *len = msgq->array[idx].len;
+        msgq->idx_r++;
+    }
+}
+
+void eos_msgq_get(EOSMsgQ *msgq, unsigned char cmd, unsigned char **buffer, uint16_t *len) {
+    uint8_t idx = EOS_MSGQ_IDX_MASK(msgq->idx_r, msgq->size);
+    unsigned char _cmd = msgq->array[idx].cmd;
+    EOSMsgItem *tmp_item = &msgq->array[idx];
+    
+    *buffer = msgq->array[idx].buffer;
+    *len = msgq->array[idx].len;
+    if (_cmd == cmd) {
+        msgq->idx_r++;
+        return;
+    }
+    for (idx = msgq->idx_r + 1; idx < msgq->idx_w; idx++) {
+        *tmp_item = msgq->array[EOS_MSGQ_IDX_MASK(idx, msgq->size)];
+        msgq->array[EOS_MSGQ_IDX_MASK(idx, msgq->size)].cmd = _cmd;
+        msgq->array[EOS_MSGQ_IDX_MASK(idx, msgq->size)].buffer = *buffer;
+        msgq->array[EOS_MSGQ_IDX_MASK(idx, msgq->size)].len = *len;
+        _cmd = tmp_item->cmd;
+        *buffer = tmp_item->buffer;
+        *len = tmp_item->len;
+        if (_cmd == cmd) {
+            msgq->idx_r++;
+            return;
+        }
+    }
+    *buffer = NULL;
+    *len = 0;
+}
+