1 files changed, 116 insertions, 0 deletions
diff --git a/src/portable/st/stm32_fsdev/fsdev_common.c b/src/portable/st/stm32_fsdev/fsdev_common.c
new file mode 100644
index 000000000..4f127ae86
--- /dev/null
+++ b/src/portable/st/stm32_fsdev/fsdev_common.c
@@ -0,0 +1,116 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2024 Ha Thach (tinyusb.org)
+ * Copyright (c) 2025, HiFiPhile (Zixun LI)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#include "tusb_option.h"
+
+#if defined(TUP_USBIP_FSDEV) && (CFG_TUH_ENABLED || CFG_TUD_ENABLED)
+
+#include "fsdev_common.h"
+
+//--------------------------------------------------------------------+
+// Global
+//--------------------------------------------------------------------+
+
+// Reset the USB Core
+void fsdev_core_reset(void) {
+  // Perform USB peripheral reset
+  FSDEV_REG->CNTR = USB_CNTR_FRES | USB_CNTR_PDWN;
+  for (volatile uint32_t i = 0; i < 200; i++) { // should be a few us
+    asm("NOP");
+  }
+
+  FSDEV_REG->CNTR &= ~USB_CNTR_PDWN;
+
+  // Wait startup time, for F042 and F070, this is <= 1 us.
+  for (volatile uint32_t i = 0; i < 200; i++) { // should be a few us
+    asm("NOP");
+  }
+
+  // Clear pending interrupts
+  FSDEV_REG->ISTR = 0;
+}
+
+// De-initialize the USB Core
+void fsdev_deinit(void) {
+  // Disable all interrupts and force USB reset
+  FSDEV_REG->CNTR = USB_CNTR_FRES;
+
+  // Clear pending interrupts
+  FSDEV_REG->ISTR = 0;
+
+  // Put USB peripheral in power down mode
+  FSDEV_REG->CNTR = USB_CNTR_FRES | USB_CNTR_PDWN;
+  for (volatile uint32_t i = 0; i < 200; i++) { // should be a few us
+    asm("NOP");
+  }
+}
+
+//--------------------------------------------------------------------+
+// BTable Helper
+//--------------------------------------------------------------------+
+
+// Aligned buffer size according to hardware
+uint16_t pma_align_buffer_size(uint16_t size, uint8_t* blsize, uint8_t* num_block) {
+  /* The STM32 full speed USB peripheral supports only a limited set of
+   * buffer sizes given by the RX buffer entry format in the USB_BTABLE. */
+  uint16_t block_in_bytes;
+  if (size > 62) {
+    block_in_bytes = 32;
+    *blsize = 1;
+    *num_block = tu_div_ceil(size, 32);
+  } else {
+    block_in_bytes = 2;
+    *blsize = 0;
+    *num_block = tu_div_ceil(size, 2);
+  }
+
+  return (*num_block) * block_in_bytes;
+}
+
+// Set RX buffer size
+void btable_set_rx_bufsize(uint32_t ep_id, uint8_t buf_id, uint16_t wCount) {
+  uint8_t blsize, num_block;
+  (void) pma_align_buffer_size(wCount, &blsize, &num_block);
+
+  /* Encode into register. When BLSIZE==1, we need to subtract 1 block count */
+  uint16_t bl_nb = (blsize << 15) | ((num_block - blsize) << 10);
+  if (bl_nb == 0) {
+    // zlp but 0 is invalid value, set blsize to 1 (32 bytes)
+    // Note: lower value can cause PMAOVR on setup with ch32v203
+    bl_nb = 1 << 15;
+  }
+
+#ifdef FSDEV_BUS_32BIT
+  uint32_t count_addr = FSDEV_BTABLE->ep32[ep_id][buf_id].count_addr;
+  count_addr = (bl_nb << 16) | (count_addr & 0x0000FFFFu);
+  FSDEV_BTABLE->ep32[ep_id][buf_id].count_addr = count_addr;
+#else
+  FSDEV_BTABLE->ep16[ep_id][buf_id].count = bl_nb;
+#endif
+}
+
+#endif