From bbed36d99709f2bd248f2f9cce30a0c4cc312dd0 Mon Sep 17 00:00:00 2001
From: muzkr <muzkr@tuta.io>
Date: Sat, 8 Nov 2025 07:24:27 +0800
Subject: [PATCH] VCP RX

---
 App/driver/vcp.c      | 11 ++++++++++-
 App/driver/vcp.h      |  3 +++
 App/usb/usb_config.h  |  9 ++++++++-
 App/usb/usbd_cdc_if.c | 35 ++++++++++++++++++++++++++++++++---
 4 files changed, 53 insertions(+), 5 deletions(-)

diff --git a/App/driver/vcp.c b/App/driver/vcp.c
index 519f465e..f6d7fec8 100644
--- a/App/driver/vcp.c
+++ b/App/driver/vcp.c
@@ -18,12 +18,21 @@
 #include "usb_config.h"
 #include "py32f071_ll_bus.h"
 
+uint8_t VCP_RxBuf[256];
+uint32_t VCP_RxBufPointer = 0;
+
 void VCP_Init()
 {
     // LL_APB1_GRP2_EnableClock(LL_APB1_GRP2_PERIPH_SYSCFG);
     LL_IOP_GRP1_EnableClock(LL_IOP_GRP1_PERIPH_GPIOA); // PA12:11
     LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_USBD);
 
-    cdc_acm_init();
+    cdc_acm_rx_buf_t rx_buf = {
+        .buf = VCP_RxBuf,
+        .size = sizeof(VCP_RxBuf),
+        .write_pointer = &VCP_RxBufPointer,
+    };
+    cdc_acm_init(rx_buf);
+
     NVIC_EnableIRQ(USBD_IRQn);
 }
diff --git a/App/driver/vcp.h b/App/driver/vcp.h
index 722359bc..80bc0b45 100644
--- a/App/driver/vcp.h
+++ b/App/driver/vcp.h
@@ -21,6 +21,9 @@
 #include <string.h>
 #include "usb_config.h"
 
+extern uint8_t VCP_RxBuf[256];
+extern uint32_t VCP_RxBufPointer;
+
 void VCP_Init();
 
 static inline void VCP_Send(const uint8_t *Buf, uint32_t Size)
diff --git a/App/usb/usb_config.h b/App/usb/usb_config.h
index 21b90275..bb316eae 100644
--- a/App/usb/usb_config.h
+++ b/App/usb/usb_config.h
@@ -86,7 +86,14 @@
 
 #define USBD_IRQHandler USB_IRQHandler
 
-void cdc_acm_init(void);
+typedef struct
+{
+    uint8_t *buf;
+    uint32_t size;
+    uint32_t *write_pointer;
+} cdc_acm_rx_buf_t;
+
+void cdc_acm_init(cdc_acm_rx_buf_t rx_buf);
 void cdc_acm_data_send_with_dtr(const uint8_t *buf, uint32_t size);
 
 
diff --git a/App/usb/usbd_cdc_if.c b/App/usb/usbd_cdc_if.c
index 97566079..aedf716a 100644
--- a/App/usb/usbd_cdc_if.c
+++ b/App/usb/usbd_cdc_if.c
@@ -89,6 +89,8 @@ static const uint8_t cdc_descriptor[] = {
 USB_MEM_ALIGNX uint8_t read_buffer[128];
 USB_MEM_ALIGNX uint8_t write_buffer[4];
 
+static cdc_acm_rx_buf_t client_rx_buf = {0};
+
 volatile bool ep_tx_busy_flag = false;
 
 #ifdef CONFIG_USB_HS
@@ -100,13 +102,37 @@ volatile bool ep_tx_busy_flag = false;
 void usbd_configure_done_callback(void)
 {
     /* setup first out ep read transfer */
-    usbd_ep_start_read(CDC_OUT_EP, read_buffer, 128);
+    usbd_ep_start_read(CDC_OUT_EP, read_buffer, sizeof(read_buffer));
 }
 
 void usbd_cdc_acm_bulk_out(uint8_t ep, uint32_t nbytes)
 {
+    cdc_acm_rx_buf_t *rx_buf = &client_rx_buf;
+    if (nbytes && rx_buf->buf)
+    {
+        const uint8_t *buf = read_buffer;
+        uint32_t pointer = *rx_buf->write_pointer;
+        while (nbytes)
+        {
+            const uint32_t rem = rx_buf->size - pointer;
+            if (0 == rem)
+            {
+                pointer = 0;
+                continue;
+            }
+
+            uint32_t size = rem < nbytes ? rem : nbytes;
+            memcpy(rx_buf->buf + pointer, buf, size);
+            buf += size;
+            nbytes -= size;
+            pointer += size;
+        }
+
+        *rx_buf->write_pointer = pointer;
+    }
+
     /* setup next out ep read transfer */
-    usbd_ep_start_read(CDC_OUT_EP, read_buffer, 128);
+    usbd_ep_start_read(CDC_OUT_EP, read_buffer, sizeof(read_buffer));
 }
 
 void usbd_cdc_acm_bulk_in(uint8_t ep, uint32_t nbytes)
@@ -133,8 +159,11 @@ struct usbd_endpoint cdc_in_ep = {
 struct usbd_interface intf0;
 struct usbd_interface intf1;
 
-void cdc_acm_init(void)
+void cdc_acm_init(cdc_acm_rx_buf_t rx_buf)
 {
+    client_rx_buf = rx_buf;
+    *client_rx_buf.write_pointer = 0;
+
     usbd_desc_register(cdc_descriptor);
     usbd_add_interface(usbd_cdc_acm_init_intf(&intf0));
     usbd_add_interface(usbd_cdc_acm_init_intf(&intf1));