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usb driver: Only board specific function of cable config is in SYS.

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This commit is contained in:
NIIBE Yutaka
2019-05-08 12:07:28 +09:00
parent e7e6f5b184
commit be43aa3051
7 changed files with 137 additions and 79 deletions
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23
mcu/sys-stm32f103.c
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@@ -64,39 +64,16 @@ set_led (int on)
#endif
}
static void wait (int count)
{
int i;
for (i = 0; i < count; i++)
asm volatile ("" : : "r" (i) : "memory");
}
static void
usb_lld_sys_shutdown (void)
{
RCC->APB1ENR &= ~RCC_APB1ENR_USBEN;
RCC->APB1RSTR = RCC_APB1RSTR_USBRST;
usb_cable_config (0);
}
static void
usb_lld_sys_init (void)
{
if ((RCC->APB1ENR & RCC_APB1ENR_USBEN)
&& (RCC->APB1RSTR & RCC_APB1RSTR_USBRST) == 0)
/* Make sure the device is disconnected, even after core reset. */
{
usb_lld_sys_shutdown ();
/* Disconnect requires SE0 (>= 2.5uS). */
wait (5*MHZ);
}
usb_cable_config (1);
RCC->APB1ENR |= RCC_APB1ENR_USBEN;
RCC->APB1RSTR = RCC_APB1RSTR_USBRST;
RCC->APB1RSTR = 0;
}
#define FLASH_KEY1 0x45670123UL