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dcd_pic: handle remote wakeup more correctly

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This commit is contained in:
Reimu NotMoe
2024-12-27 00:57:22 +08:00
parent 8907a817a2
commit f409472998
1 changed files with 18 additions and 1 deletions
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19
src/portable/microchip/pic/dcd_pic.c
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@@ -532,8 +532,25 @@ void dcd_remote_wakeup(uint8_t rhport)
#else
U1CONbits.RESUME = 1;
#endif
unsigned cnt = 25000000 / 1000;
// FIXME: Assert RESUME signal correctly, requires device-specific handling
// For now we use a hardcoded cycle-based delay which attempts to delay 10ms
// at the most common CPU frequencies. On PIC32s we assume the loop body
// takes 3 cycles. On 16-bit PICs we assume the XC16 compiler is in use and
// use its `__delay_ms' function.
#if CFG_TUSB_MCU == OPT_MCU_PIC32MM
uint32_t cnt = 24000000 / 1000 / 3;
while (cnt--) asm volatile("nop");
#elif CFG_TUSB_MCU == OPT_MCU_PIC32MX
uint32_t cnt = 40000000 / 1000 / 3;
while (cnt--) asm volatile("nop");
#elif CFG_TUSB_MCU == OPT_MCU_PIC32MK
uint32_t cnt = 120000000 / 1000 / 3;
while (cnt--) asm volatile("nop");
#else
__delay_ms(10);
#endif
#if TU_PIC_INT_SIZE == 4
U1CONCLR = _U1CON_RESUME_MASK;