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/*
* SPDX-FileCopyrightText: Copyright (c) 2024 Ha Thach (tinyusb.org)
* SPDX-FileCopyrightText: Copyright (c) 2025, HiFiPhile (Zixun LI)
* SPDX-License-Identifier: MIT
*
* 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 = U_CNTR_FRES | U_CNTR_PDWN;
for (volatile uint32_t i = 0; i < 200; i++) { // should be a few us
asm("NOP");
}
FSDEV_REG->CNTR &= ~U_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;
#if (CFG_TUSB_MCU == OPT_MCU_AT32F403A_407) || (CFG_TUSB_MCU == OPT_MCU_AT32F413)
// Enable larger PMA area
CRM->misc1_bit.usbbufs = 1;
#endif
}
// De-initialize the USB Core
void fsdev_deinit(void) {
// Disable all interrupts and force USB reset
FSDEV_REG->CNTR = U_CNTR_FRES;
// Clear pending interrupts
FSDEV_REG->ISTR = 0;
// Put USB peripheral in power down mode
FSDEV_REG->CNTR = U_CNTR_FRES | U_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 = (uint8_t)tu_div_ceil(size, 32);
} else {
block_in_bytes = 2;
*blsize = 0;
*num_block = (uint8_t)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 CFG_TUSB_FSDEV_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
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