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Insert small delay for LowSpeed device

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This commit is contained in:
Mitsumine Suzu
2025-08-24 16:28:32 +09:00
parent bd9dd75da8
commit 522a34ee28
1 changed files with 19 additions and 16 deletions
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35
src/portable/wch/hcd_ch32_usbfs.c
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@@ -55,18 +55,18 @@ TU_ATTR_ALIGNED(4) static uint8_t USBFS_TX_Buf[USBFS_TX_BUF_LEN];
#define LOG_CH32_USBFSH(...) TU_LOG3(__VA_ARGS__) #define LOG_CH32_USBFSH(...) TU_LOG3(__VA_ARGS__)
// Busywait for delay microseconds/nanoseconds // Busywait for delay microseconds/nanoseconds
// static void loopdelay(uint32_t count) static void loopdelay(uint32_t count)
// { {
// volatile uint32_t c = count / 3; volatile uint32_t c = count / 3;
// if (c == 0) { return; } if (c == 0) { return; }
// // while (c-- != 0); // while (c-- != 0);
// asm volatile( asm volatile(
// "1: \n" // loop label "1: \n" // loop label
// " addi %0, %0, -1 \n" // c-- " addi %0, %0, -1 \n" // c--
// " bne %0, zero, 1b \n" // if (c != 0) goto loop " bne %0, zero, 1b \n" // if (c != 0) goto loop
// : "+r"(c) // c is input/output operand : "+r"(c) // c is input/output operand
// ); );
// } }
// Endpoint status // Endpoint status
@@ -194,10 +194,13 @@ static bool hardware_start_xfer(uint8_t pid, uint8_t ep_addr, uint8_t data_toggl
: "(other)", : "(other)",
pid, ep_addr, data_toggle); pid, ep_addr, data_toggle);
// if (pid == USB_PID_IN) //WORKAROUND: For LowSpeed device, insert small delay
// { // FIXME: long delay needed (at release build) about 30msec bool is_lowspeed_device = tuh_speed_get(usb_current_xfer_info.dev_addr) == TUSB_SPEED_LOW;
// loopdelay(SystemCoreClock / 1000 * 30); if (is_lowspeed_device) {
// } //NOTE: worked -> SystemCoreClock / 1000000 * 50, 25
// NOT worked -> 20 and less (at 144MHz internal clock)
loopdelay(SystemCoreClock / 1000000 * 40);
}
uint8_t pid_edpt = (pid << 4) | (tu_edpt_number(ep_addr) & 0x0f); uint8_t pid_edpt = (pid << 4) | (tu_edpt_number(ep_addr) & 0x0f);
USBOTG_H_FS->HOST_TX_CTRL = (data_toggle != 0) ? USBFS_UH_T_TOG : 0; USBOTG_H_FS->HOST_TX_CTRL = (data_toggle != 0) ? USBFS_UH_T_TOG : 0;