net protocol added req/rep messages

9 files changed, 187 insertions, 114 deletions

diff --git a/fw/fe310/eos/Makefile b/fw/fe310/eos/Makefile
index 66ac136..abdcbac 100644
--- a/fw/fe310/eos/Makefile
+++ b/fw/fe310/eos/Makefile
@@ -1,8 +1,10 @@
 include ../common.mk
 
-CFLAGS += -I. -I../bsp/include -I../bsp/drivers
+CRYPTO_DIR = ../../../crypto
 
-obj = trap_entry.o eos.o msgq.o event.o interrupt.o timer.o power.o i2s.o i2c.o uart.o spi.o spi_dev.o sdcard.o net.o wifi.o cell.o sock.o unicode.o
+CFLAGS += -I. -I../bsp/include -I../bsp/drivers -I$(CRYPTO_DIR)
+
+obj = trap_entry.o eos.o msgq.o event.o interrupt.o timer.o power.o i2s.o i2c.o uart.o spi.o spi_dev.o sdcard.o sdc_crypto.o cam.o net.o wifi.o cell.o sock.o unicode.o
 
 
 %.o: %.c %.h
diff --git a/fw/fe310/eos/eos.c b/fw/fe310/eos/eos.c
index a96f391..e2ad3d1 100644
--- a/fw/fe310/eos/eos.c
+++ b/fw/fe310/eos/eos.c
@@ -42,7 +42,7 @@ void eos_init(void) {
     eos_sock_init();
     eos_bq25895_init();
 
-    eos_net_wake(wakeup_cause);
+    eos_net_start(wakeup_cause);
 
     eve_init(wakeup_cause == EOS_PWR_WAKE_RST, touch_calibrate, touch_matrix, EVE_GPIO_DIR);
     if (touch_calibrate) {
diff --git a/fw/fe310/eos/event.c b/fw/fe310/eos/event.c
index 6953dca..e0a185f 100644
--- a/fw/fe310/eos/event.c
+++ b/fw/fe310/eos/event.c
@@ -55,12 +55,28 @@ void eos_evtq_pop_isr(unsigned char *type, unsigned char **buffer, uint16_t *len
     eos_msgq_pop(&_eos_event_q, type, buffer, len);
 }
 
+int eos_evtq_get(unsigned char type, unsigned char **buffer, uint16_t *len) {
+    int rv = 0;
+
+    clear_csr(mstatus, MSTATUS_MIE);
+    rv = eos_msgq_find(&_eos_event_q, type, NULL, 0, buffer, len);
+    set_csr(mstatus, MSTATUS_MIE);
+}
+
+int eos_evtq_find(unsigned char type, unsigned char *selector, uint16_t sel_len, unsigned char **buffer, uint16_t *len) {
+    int rv = 0;
+
+    clear_csr(mstatus, MSTATUS_MIE);
+    rv = eos_msgq_find(&_eos_event_q, type, selector, sel_len, buffer, len);
+    set_csr(mstatus, MSTATUS_MIE);
+}
+
 void eos_evtq_wait(unsigned char type, unsigned char *selector, uint16_t sel_len, unsigned char **buffer, uint16_t *len) {
     int rv = 0;
 
     while(!rv) {
         clear_csr(mstatus, MSTATUS_MIE);
-        rv = eos_msgq_get(&_eos_event_q, type, selector, sel_len, buffer, len);
+        rv = eos_msgq_find(&_eos_event_q, type, selector, sel_len, buffer, len);
         if (!rv) {
             unsigned char _type;
             unsigned char *_buffer;
@@ -127,6 +143,7 @@ void eos_evtq_bad_handler(unsigned char type, unsigned char *buffer, uint16_t le
 void eos_evtq_set_handler(unsigned char type, eos_evt_handler_t handler) {
     unsigned char idx = (type & EOS_EVT_MASK) >> 4;
 
+    if (handler == NULL) handler = eos_evtq_bad_handler;
     if (idx <= EOS_EVT_MAX_EVT) evt_handler[idx] = handler;
 }
 
diff --git a/fw/fe310/eos/event.h b/fw/fe310/eos/event.h
index ba906bb..c9edd03 100644
--- a/fw/fe310/eos/event.h
+++ b/fw/fe310/eos/event.h
@@ -9,6 +9,8 @@ int eos_evtq_push(unsigned char type, unsigned char *buffer, uint16_t len);
 int eos_evtq_push_isr(unsigned char type, unsigned char *buffer, uint16_t len);
 void eos_evtq_pop(unsigned char *type, unsigned char **buffer, uint16_t *len);
 void eos_evtq_pop_isr(unsigned char *type, unsigned char **buffer, uint16_t *len);
+int eos_evtq_get(unsigned char type, unsigned char **buffer, uint16_t *len);
+int eos_evtq_find(unsigned char type, unsigned char *selector, uint16_t sel_len, unsigned char **buffer, uint16_t *len);
 void eos_evtq_wait(unsigned char type, unsigned char *selector, uint16_t sel_len, unsigned char **buffer, uint16_t *len);
 void eos_evtq_flush(void);
 void eos_evtq_flush_isr(void);
@@ -17,4 +19,3 @@ void eos_evtq_loop(void);
 void eos_evtq_bad_handler(unsigned char type, unsigned char *buffer, uint16_t len);
 void eos_evtq_set_handler(unsigned char type, eos_evt_handler_t handler);
 eos_evt_handler_t eos_evtq_get_handler(unsigned char type);
-
diff --git a/fw/fe310/eos/msgq.c b/fw/fe310/eos/msgq.c
index e76090c..a483a58 100644
--- a/fw/fe310/eos/msgq.c
+++ b/fw/fe310/eos/msgq.c
@@ -42,40 +42,54 @@ void eos_msgq_pop(EOSMsgQ *msgq, unsigned char *type, unsigned char **buffer, ui
     }
 }
 
-int eos_msgq_get(EOSMsgQ *msgq, unsigned char type, unsigned char *selector, uint16_t sel_len, unsigned char **buffer, uint16_t *len) {
+int eos_msgq_find(EOSMsgQ *msgq, unsigned char type, unsigned char *selector, uint16_t sel_len, unsigned char **buffer, uint16_t *len) {
     uint8_t i, j, idx;
+    unsigned char *_buffer;
+    uint16_t _len;
 
     if (msgq->idx_r == msgq->idx_w) {
-        *buffer = NULL;
-        *len = 0;
+        if (buffer && len) {
+            *buffer = NULL;
+            *len = 0;
+        }
         return 0;
     }
 
     idx = IDX_MASK(msgq->idx_r, msgq->size);
     if (type == msgq->array[idx].type) {
-        *buffer = msgq->array[idx].buffer;
-        *len = msgq->array[idx].len;
-        if ((selector == NULL) || (sel_len == 0) || ((sel_len <= *len) && (memcmp(selector, *buffer, sel_len) == 0))) {
+        _buffer = msgq->array[idx].buffer;
+        _len = msgq->array[idx].len;
+        if ((selector == NULL) || (sel_len == 0) || ((sel_len <= _len) && (memcmp(selector, _buffer, sel_len) == 0))) {
             msgq->idx_r++;
+            if (buffer && len) {
+                *buffer = _buffer;
+                *len = _len;
+            }
             return 1;
         }
     }
     for (i = msgq->idx_r + 1; IDX_LT(i, msgq->idx_w); i++) {
         idx = IDX_MASK(i, msgq->size);
         if (type== msgq->array[idx].type) {
-            *buffer = msgq->array[idx].buffer;
-            *len = msgq->array[idx].len;
-            if ((selector == NULL) || (sel_len == 0) || ((sel_len <= *len) && (memcmp(selector, *buffer, sel_len) == 0))) {
+            _buffer = msgq->array[idx].buffer;
+            _len = msgq->array[idx].len;
+            if ((selector == NULL) || (sel_len == 0) || ((sel_len <= _len) && (memcmp(selector, _buffer, sel_len) == 0))) {
                 for (j = i + 1; IDX_LT(j, msgq->idx_w); j++) {
                     msgq->array[IDX_MASK(j - 1, msgq->size)] = msgq->array[IDX_MASK(j, msgq->size)];
                 }
                 msgq->idx_w--;
+                if (buffer && len) {
+                    *buffer = _buffer;
+                    *len = _len;
+                }
                 return 1;
             }
         }
     }
-    *buffer = NULL;
-    *len = 0;
+    if (buffer && len) {
+        *buffer = NULL;
+        *len = 0;
+    }
     return 0;
 }
 
diff --git a/fw/fe310/eos/msgq.h b/fw/fe310/eos/msgq.h
index 9f2ca81..7e3b5e5 100644
--- a/fw/fe310/eos/msgq.h
+++ b/fw/fe310/eos/msgq.h
@@ -16,7 +16,7 @@ typedef struct EOSMsgQ {
 void eos_msgq_init(EOSMsgQ *msgq, EOSMsgItem *array, uint8_t size);
 int eos_msgq_push(EOSMsgQ *msgq, unsigned char type, unsigned char *buffer, uint16_t len);
 void eos_msgq_pop(EOSMsgQ *msgq, unsigned char *type, unsigned char **buffer, uint16_t *len);
-int eos_msgq_get(EOSMsgQ *msgq, unsigned char type, unsigned char *selector, uint16_t sel_len, unsigned char **buffer, uint16_t *len);
+int eos_msgq_find(EOSMsgQ *msgq, unsigned char type, unsigned char *selector, uint16_t sel_len, unsigned char **buffer, uint16_t *len);
 uint8_t eos_msgq_len(EOSMsgQ *msgq);
 
 typedef struct EOSBufQ {
diff --git a/fw/fe310/eos/net.c b/fw/fe310/eos/net.c
index 5edb013..197c2b1 100644
--- a/fw/fe310/eos/net.c
+++ b/fw/fe310/eos/net.c
@@ -20,12 +20,12 @@
 #include "net.h"
 
 #define NET_STATE_FLAG_RUN      0x01
-#define NET_STATE_FLAG_RST      0x02
-#define NET_STATE_FLAG_RTS      0x04
-#define NET_STATE_FLAG_CTS      0x08
-#define NET_STATE_FLAG_INIT     0x10
-#define NET_STATE_FLAG_ONEW     0x20
-#define NET_STATE_FLAG_XCHG     0x40
+#define NET_STATE_FLAG_INIT     0x02
+#define NET_STATE_FLAG_XCHG     0x04
+#define NET_STATE_FLAG_ONEW     0x10
+#define NET_STATE_FLAG_REPW     0x20
+#define NET_STATE_FLAG_RTS      0x40
+#define NET_STATE_FLAG_CTS      0x80
 
 #define MIN(X, Y)               (((X) < (Y)) ? (X) : (Y))
 #define MAX(X, Y)               (((X) > (Y)) ? (X) : (Y))
@@ -54,12 +54,11 @@ static int net_xchg_sleep(void) {
     int i;
     int rv = EOS_OK;
     volatile uint32_t x = 0;
-
     net_state_flags &= ~NET_STATE_FLAG_CTS;
 
     SPI1_REG(SPI_REG_CSMODE) = SPI_CSMODE_HOLD;
 
-    SPI1_REG(SPI_REG_TXFIFO) = 0xff;
+    SPI1_REG(SPI_REG_TXFIFO) = 0xFF;
     while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
     if (x & 0xFF) rv = EOS_ERR_BUSY;
 
@@ -77,6 +76,7 @@ static int net_xchg_sleep(void) {
 static void net_xchg_wake(void) {
     int i;
     volatile uint32_t x = 0;
+    net_state_flags &= ~NET_STATE_FLAG_CTS;
 
     SPI1_REG(SPI_REG_CSMODE) = SPI_CSMODE_HOLD;
 
@@ -90,13 +90,15 @@ static void net_xchg_wake(void) {
 }
 
 static void net_xchg_reset(void) {
+    volatile uint32_t x = 0;
     net_state_flags &= ~NET_STATE_FLAG_CTS;
-    net_state_flags |= (NET_STATE_FLAG_RST | NET_STATE_FLAG_XCHG);
 
     SPI1_REG(SPI_REG_CSMODE) = SPI_CSMODE_HOLD;
+
     SPI1_REG(SPI_REG_TXFIFO) = 0;
-    SPI1_REG(SPI_REG_RXCTRL) = SPI_RXWM(0);
-    SPI1_REG(SPI_REG_IE) = SPI_IP_RXWM;
+    while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
+
+    SPI1_REG(SPI_REG_CSMODE) = SPI_CSMODE_AUTO;
 }
 
 static void net_xchg_start(unsigned char type, unsigned char *buffer, uint16_t len) {
@@ -105,6 +107,7 @@ static void net_xchg_start(unsigned char type, unsigned char *buffer, uint16_t l
 
     if (net_state_next_cnt && (net_state_next_buf == NULL)) type |= EOS_NET_MTYPE_FLAG_ONEW;
     if (type & EOS_NET_MTYPE_FLAG_ONEW) net_state_flags |= NET_STATE_FLAG_ONEW;
+    if (type & EOS_NET_MTYPE_FLAG_REPW) net_state_flags |= NET_STATE_FLAG_REPW;
 
     net_state_type = type;
     net_state_len_tx = len;
@@ -123,40 +126,36 @@ static int net_xchg_next(unsigned char *_buffer) {
     unsigned char type;
     unsigned char *buffer = NULL;
     uint16_t len;
+    int ret = _buffer ? 1 : 0;
 
     eos_msgq_pop(&net_send_q, &type, &buffer, &len);
     if (type) {
         net_xchg_start(type, buffer, len);
     } else if (net_state_flags & NET_STATE_FLAG_RTS) {
-        if (_buffer == NULL) _buffer = eos_bufq_pop(&net_buf_q);
         if (_buffer) {
-            net_xchg_start(0, _buffer, 0);
-            return 0;
+            buffer = _buffer;
+            ret = 0;
+        } else {
+            buffer = eos_bufq_pop(&net_buf_q);
         }
+        if (buffer) net_xchg_start(0, buffer, 0);
     }
-    return 1;
+
+    return ret;
 }
 
 static void net_handle_xchg(void) {
     volatile uint32_t r1, r2, r3;
     uint32_t len;
 
-    if (net_state_flags & NET_STATE_FLAG_RST) {
-        net_state_flags &= ~(NET_STATE_FLAG_RST | NET_STATE_FLAG_XCHG);
-
-        r1 = SPI1_REG(SPI_REG_RXFIFO);
-        SPI1_REG(SPI_REG_CSMODE) = SPI_CSMODE_AUTO;
-        SPI1_REG(SPI_REG_IE) = 0x0;
-
-        return;
-    } else if (net_state_flags & NET_STATE_FLAG_INIT) {
+    if (net_state_flags & NET_STATE_FLAG_INIT) {
         net_state_flags &= ~NET_STATE_FLAG_INIT;
 
         r1 = SPI1_REG(SPI_REG_RXFIFO);
         r2 = SPI1_REG(SPI_REG_RXFIFO);
         r3 = SPI1_REG(SPI_REG_RXFIFO);
 
-        if (net_state_flags & NET_STATE_FLAG_ONEW) {
+        if (net_state_flags & (NET_STATE_FLAG_ONEW | NET_STATE_FLAG_REPW)) {
             r1 = 0;
             r2 = 0;
             r3 = 0;
@@ -189,14 +188,18 @@ static void net_handle_xchg(void) {
 
     eos_spi_handle_xchg();
     if (SPI1_REG(SPI_REG_CSMODE) == SPI_CSMODE_AUTO) {  // exchange done
-        if (net_state_type) {
-            int r = eos_evtq_push_isr(EOS_EVT_NET | net_state_type, net_state_buf, net_state_len_rx);
-            if (r) eos_bufq_push(&net_buf_q, net_state_buf);
-        } else if (((net_state_flags & NET_STATE_FLAG_ONEW) || net_state_next_cnt) && (net_state_next_buf == NULL)) {
-            net_state_next_buf = net_state_buf;
-            net_state_flags &= ~NET_STATE_FLAG_ONEW;
+        if (net_state_flags & NET_STATE_FLAG_REPW) {
+            net_state_flags &= ~NET_STATE_FLAG_REPW;
         } else {
-            eos_bufq_push(&net_buf_q, net_state_buf);
+            if (net_state_type) {
+                int r = eos_evtq_push_isr(EOS_EVT_NET | net_state_type, net_state_buf, net_state_len_rx);
+                if (r) eos_bufq_push(&net_buf_q, net_state_buf);
+            } else if (((net_state_flags & NET_STATE_FLAG_ONEW) || net_state_next_cnt) && (net_state_next_buf == NULL)) {
+                net_state_next_buf = net_state_buf;
+                net_state_flags &= ~NET_STATE_FLAG_ONEW;
+            } else {
+                eos_bufq_push(&net_buf_q, net_state_buf);
+            }
         }
         net_state_flags &= ~NET_STATE_FLAG_XCHG;
     }
@@ -216,7 +219,9 @@ static void net_handle_rts(void) {
     if (GPIO_REG(GPIO_RISE_IP) & rts_offset) {
         GPIO_REG(GPIO_RISE_IP) = rts_offset;
         net_state_flags |= NET_STATE_FLAG_RTS;
-        if ((net_state_flags & NET_STATE_FLAG_RUN) && (net_state_flags & NET_STATE_FLAG_CTS)) net_xchg_reset();
+        if ((net_state_flags & NET_STATE_FLAG_RUN) && (net_state_flags & NET_STATE_FLAG_CTS)) {
+            net_xchg_reset();
+        }
     } else if (GPIO_REG(GPIO_FALL_IP) & rts_offset) {
         GPIO_REG(GPIO_FALL_IP) = rts_offset;
         net_state_flags &= ~NET_STATE_FLAG_RTS;
@@ -272,10 +277,12 @@ static void evt_handler_wrapper(unsigned char type, unsigned char *buffer, uint1
 }
 
 static void evt_handler(unsigned char type, unsigned char *buffer, uint16_t len) {
-    unsigned char idx = ((type & EOS_EVT_MASK) >> 4) - 1;
-    uint16_t flag = (uint16_t)1 << ((type & ~EOS_EVT_MASK) - 1);
+    unsigned char idx = (type & EOS_EVT_MASK) >> 4;
 
-    if (idx < EOS_EVT_MAX_EVT) {
+    if (idx && (idx <= EOS_EVT_MAX_EVT)) {
+        uint16_t flag = (uint16_t)1 << (type & ~EOS_EVT_MASK);
+
+        idx--;
         if (flag & net_flags_acq[idx]) {
             evt_handler_wrapper(type, buffer, len, idx, flag);
         } else {
@@ -286,6 +293,17 @@ static void evt_handler(unsigned char type, unsigned char *buffer, uint16_t len)
     }
 }
 
+static void net_pause(void) {
+    net_state_flags &= ~NET_STATE_FLAG_RUN;
+}
+
+static void net_resume(void) {
+    net_state_flags |= NET_STATE_FLAG_RUN;
+    if (net_state_flags & NET_STATE_FLAG_CTS) {
+        net_xchg_next(NULL);
+    }
+}
+
 void eos_net_init(void) {
     int i;
 
@@ -317,18 +335,33 @@ void eos_net_init(void) {
     GPIO_REG(GPIO_RISE_IE)      |=  (1 << NET_PIN_RTS);
     GPIO_REG(GPIO_FALL_IE)      |=  (1 << NET_PIN_RTS);
     eos_intr_set(INT_GPIO_BASE + NET_PIN_RTS, IRQ_PRIORITY_NET_RTS, net_handle_rts);
+
+    /* set initial state */
+    clear_csr(mstatus, MSTATUS_MIE);
+    if (GPIO_REG(GPIO_INPUT_VAL) & (1 << NET_PIN_CTS)) net_state_flags |= NET_STATE_FLAG_CTS;
+    if (GPIO_REG(GPIO_INPUT_VAL) & (1 << NET_PIN_RTS)) net_state_flags |= NET_STATE_FLAG_RTS;
+    set_csr(mstatus, MSTATUS_MIE);
 }
 
-void eos_net_start(void) {
+void eos_net_start(uint8_t wakeup_cause) {
     eos_intr_set_handler(INT_SPI1_BASE, net_handle_xchg);
     SPI1_REG(SPI_REG_SCKDIV) = eos_spi_div(EOS_SPI_DEV_NET);
     SPI1_REG(SPI_REG_CSID) = eos_spi_csid(EOS_SPI_DEV_NET);
 
     clear_csr(mstatus, MSTATUS_MIE);
-    net_state_flags |= NET_STATE_FLAG_RUN;
-    if (net_state_flags & NET_STATE_FLAG_CTS) {
-        net_xchg_next(NULL);
+    if (wakeup_cause) {
+        if (wakeup_cause != EOS_PWR_WAKE_BTN) {
+            net_xchg_wake();
+        }
+        if (!(net_state_flags & NET_STATE_FLAG_CTS)) {
+            while (!(GPIO_REG(GPIO_RISE_IP) & (1 << NET_PIN_CTS))) {
+                asm volatile ("wfi");
+            }
+            GPIO_REG(GPIO_RISE_IP) = (1 << NET_PIN_CTS);
+        }
+        net_xchg_reset();
     }
+    net_resume();
     set_csr(mstatus, MSTATUS_MIE);
 }
 
@@ -395,39 +428,6 @@ int eos_net_sleep(uint32_t timeout) {
     return rv;
 }
 
-int eos_net_wake(uint8_t source) {
-    int rv = EOS_OK;
-
-    clear_csr(mstatus, MSTATUS_MIE);
-    if (net_state_flags & NET_STATE_FLAG_RUN) rv = EOS_ERR;
-    set_csr(mstatus, MSTATUS_MIE);
-
-    if (rv) return rv;
-
-    eos_intr_set_handler(INT_SPI1_BASE, net_handle_xchg);
-    SPI1_REG(SPI_REG_SCKDIV) = eos_spi_div(EOS_SPI_DEV_NET);
-    SPI1_REG(SPI_REG_CSID) = eos_spi_csid(EOS_SPI_DEV_NET);
-
-    clear_csr(mstatus, MSTATUS_MIE);
-    net_state_flags |= NET_STATE_FLAG_RUN;
-    if (source) {
-        if (source != EOS_PWR_WAKE_BTN) {
-            net_xchg_wake();
-        }
-        if (!(net_state_flags & NET_STATE_FLAG_CTS)) {
-            while (!(GPIO_REG(GPIO_RISE_IP) & (1 << NET_PIN_CTS))) {
-                asm volatile ("wfi");
-            }
-            GPIO_REG(GPIO_RISE_IP) = (1 << NET_PIN_CTS);
-        }
-        net_xchg_reset();
-        if (GPIO_REG(GPIO_INPUT_VAL) & (1 << NET_PIN_RTS)) net_state_flags |= NET_STATE_FLAG_RTS;
-    }
-    set_csr(mstatus, MSTATUS_MIE);
-
-    return rv;
-}
-
 void eos_net_bad_handler(unsigned char type, unsigned char *buffer, uint16_t len) {
     eos_evtq_bad_handler(type, buffer, len);
     if (buffer) eos_net_free(buffer, 0);
@@ -439,10 +439,11 @@ void eos_net_set_handler(unsigned char mtype, eos_evt_handler_t handler) {
 }
 
 void eos_net_acquire_for_evt(unsigned char type, char acq) {
-    unsigned char idx = ((type & EOS_EVT_MASK) >> 4) - 1;
-    uint16_t flag = type & ~EOS_EVT_MASK ? (uint16_t)1 << ((type & ~EOS_EVT_MASK) - 1) : 0xFFFF;
+    unsigned char idx = (type & EOS_EVT_MASK) >> 4;
+    uint16_t flag = type & ~EOS_EVT_MASK ? (uint16_t)1 << (type & ~EOS_EVT_MASK) : 0xFFFF;
 
-    if (idx < EOS_EVT_MAX_EVT) {
+    if (idx && (idx <= EOS_EVT_MAX_EVT)) {
+        idx--;
         net_flags_acq[idx] &= ~flag;
         if (acq) net_flags_acq[idx] |= flag;
     }
@@ -486,45 +487,81 @@ void eos_net_free(unsigned char *buffer, unsigned char more) {
     if ((more || net_state_next_cnt) && (net_state_next_buf == NULL)) {
         net_state_next_buf = buffer;
     } else {
-        if ((net_state_flags & NET_STATE_FLAG_RUN) && (net_state_flags & NET_STATE_FLAG_CTS)) do_release = net_xchg_next(buffer);
-        if (do_release) eos_bufq_push(&net_buf_q, buffer);
+        if ((net_state_flags & NET_STATE_FLAG_RUN) && (net_state_flags & NET_STATE_FLAG_CTS)) {
+            do_release = net_xchg_next(buffer);
+        }
+        if (do_release) {
+            eos_bufq_push(&net_buf_q, buffer);
+        }
     }
     set_csr(mstatus, MSTATUS_MIE);
 }
 
-int eos_net_send(unsigned char type, unsigned char *buffer, uint16_t len, unsigned char more) {
+static int net_xchg(unsigned char *type, unsigned char *buffer, uint16_t *len) {
     int rv = EOS_OK;
-
-    if (more) type |= EOS_NET_MTYPE_FLAG_ONEW;
+    int _sync = 0;
+    unsigned char _type = *type;
+    uint16_t _len = *len;
+    uint8_t spi_dev = EOS_SPI_DEV_NET;
 
     clear_csr(mstatus, MSTATUS_MIE);
-    if ((type & EOS_NET_MTYPE_FLAG_ONEW) && !(net_state_flags & NET_STATE_FLAG_RUN)) {
-        uint8_t spi_dev;
+    if ((_type & EOS_NET_MTYPE_FLAG_REPW) || ((_type & EOS_NET_MTYPE_FLAG_ONEW) && !(net_state_flags & NET_STATE_FLAG_RUN))) _sync = 1;
+
+    if (!(net_state_flags & NET_STATE_FLAG_RUN) && _sync) {
+        int _rv;
 
         set_csr(mstatus, MSTATUS_MIE);
         spi_dev = eos_spi_dev();
-        rv = eos_spi_deselect();
-        if (rv) return rv;
-
+        _rv = eos_spi_deselect();
+        if (_rv) return _rv;
         clear_csr(mstatus, MSTATUS_MIE);
+    }
+
+    if (_sync) {
+        net_pause();
         while (!(net_state_flags & NET_STATE_FLAG_CTS)) {
             asm volatile ("wfi");
             set_csr(mstatus, MSTATUS_MIE);
             clear_csr(mstatus, MSTATUS_MIE);
         }
-        net_xchg_start(type, buffer, len);
-        set_csr(mstatus, MSTATUS_MIE);
-
-        eos_spi_select(spi_dev);
+        net_xchg_start(_type, buffer, _len);
+        if (_type & EOS_NET_MTYPE_FLAG_REPW) {
+            while (!(net_state_flags & NET_STATE_FLAG_CTS)) {
+                asm volatile ("wfi");
+                set_csr(mstatus, MSTATUS_MIE);
+                clear_csr(mstatus, MSTATUS_MIE);
+            }
+            net_xchg_start(0, buffer, 0);
+            while (net_state_flags & NET_STATE_FLAG_XCHG) {
+                asm volatile ("wfi");
+                set_csr(mstatus, MSTATUS_MIE);
+                clear_csr(mstatus, MSTATUS_MIE);
+            }
+            *type = net_state_type;
+            *len = net_state_len_rx;
+        }
+        net_resume();
     } else {
         if ((net_state_flags & NET_STATE_FLAG_RUN) && (net_state_flags & NET_STATE_FLAG_CTS)) {
-            net_xchg_start(type, buffer, len);
+            net_xchg_start(_type, buffer, _len);
         } else {
-            rv = eos_msgq_push(&net_send_q, type, buffer, len);
+            rv = eos_msgq_push(&net_send_q, _type, buffer, _len);
             if (rv) eos_bufq_push(&net_buf_q, buffer);
         }
-        set_csr(mstatus, MSTATUS_MIE);
     }
 
+    set_csr(mstatus, MSTATUS_MIE);
+    if (spi_dev != EOS_SPI_DEV_NET) eos_spi_select(spi_dev);
+
     return rv;
 }
+
+int eos_net_send(unsigned char type, unsigned char *buffer, uint16_t len, unsigned char more) {
+    if (more) type |= EOS_NET_MTYPE_FLAG_ONEW;
+    return net_xchg(&type, buffer, &len);
+}
+
+int eos_net_xchg(unsigned char *type, unsigned char *buffer, uint16_t *len) {
+    *type |= EOS_NET_MTYPE_FLAG_REPW;
+    return net_xchg(type, buffer, len);
+}
diff --git a/fw/fe310/eos/net.h b/fw/fe310/eos/net.h
index 1aaea1f..ecefbec 100644
--- a/fw/fe310/eos/net.h
+++ b/fw/fe310/eos/net.h
@@ -14,16 +14,17 @@
 
 #define EOS_NET_MAX_MTYPE           8
 
-#define EOS_NET_MTYPE_FLAG_ONEW     0x80
+#define EOS_NET_MTYPE_FLAG_ONEW     0x40
+#define EOS_NET_MTYPE_FLAG_REPW     0x80
+#define EOS_NET_MTYPE_FLAG_MASK     0xc0
 
 /* fe310 specific */
 #define EOS_NET_SIZE_BUFQ           2
 
 void eos_net_init(void);
-void eos_net_start(void);
+void eos_net_start(uint8_t wakeup_cause);
 void eos_net_stop(void);
 int eos_net_sleep(uint32_t timeout);
-int eos_net_wake(uint8_t source);
 
 void eos_net_bad_handler(unsigned char type, unsigned char *buffer, uint16_t len);
 void eos_net_set_handler(unsigned char type, eos_evt_handler_t handler);
@@ -34,3 +35,4 @@ void eos_net_release(void);
 unsigned char *eos_net_alloc(void);
 void eos_net_free(unsigned char *buffer, unsigned char more);
 int eos_net_send(unsigned char type, unsigned char *buffer, uint16_t len, unsigned char more);
+int eos_net_xchg(unsigned char *type, unsigned char *buffer, uint16_t *len);
diff --git a/fw/fe310/eos/spi_dev.c b/fw/fe310/eos/spi_dev.c
index 4713826..0448f76 100644
--- a/fw/fe310/eos/spi_dev.c
+++ b/fw/fe310/eos/spi_dev.c
@@ -59,7 +59,7 @@ int eos_spi_deselect(void) {
     eos_spi_stop();
 
     spi_dev = EOS_SPI_DEV_NET;
-    eos_net_start();
+    eos_net_start(0);
 
     return EOS_OK;
 }