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Testing USB on STM32L4.

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This commit is contained in:
NIIBE Yutaka
2019-04-18 17:12:14 +09:00
parent 1f159888a0
commit 359082f80a
13 changed files with 215 additions and 69 deletions
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74
mcu/sys-stm32l4.c
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@@ -47,16 +47,25 @@ static void wait (int count)
void
usb_lld_sys_shutdown (void)
{
USB_STM32L4->BCDR &= 0x7fff; /* DP disable */
RCC->APB1ENR1 &= ~(RCC_APB1_1_USB | RCC_APB1_1_CRS);
RCC->APB1RSTR1 |= (RCC_APB1_1_USB | RCC_APB1_1_CRS);
}
struct CRS
{
volatile uint32_t CR;
volatile uint32_t CFGR;
volatile uint32_t ISR;
volatile uint32_t ICR;
};
static struct CRS *const CRS = ((struct CRS *)(APB1PERIPH_BASE + 0x6000));
void
usb_lld_sys_init (void)
{
/* XXX: should configure CRS (clock recovery system) and HSI48 clock */
if ((RCC->APB1ENR1 & RCC_APB1_1_USB)
if ((RCC->APB1ENR1 & RCC_APB1_1_USB)
&& (RCC->APB1RSTR1 & RCC_APB1_1_USB) == 0)
/* Make sure the device is disconnected, even after core reset. */
{
@@ -65,10 +74,46 @@ usb_lld_sys_init (void)
wait (5*MHZ);
}
/* Enable USB clock and CRC clock */
RCC->APB1ENR1 |= (RCC_APB1_1_USB | RCC_APB1_1_CRS);
RCC->APB1RSTR1 = (RCC_APB1_1_USB | RCC_APB1_1_CRS);
RCC->APB1RSTR1 = 0;
USB_STM32L4->BCDR |= 0x8000; /* DP enable */
/* Configure CRS (clock recovery system) for HSI48 clock */
CRS->CFGR = ( (0x00 << 31) | /* Polarity rising */
(0x02 << 28) | /* USB SOF for Sync */
(0x00 << 24) | /* divider = 1 */
(0x22 << 16) | /* Frequency error limit */
0xBB7F ); /* Reload value */
CRS->CR |= ( (1 << 6) | /* Automatic trimming enable */
(1 << 5) ); /* Frequency error counter enable */
}
void
nvic_system_reset (void)
{
SCB->AIRCR = (0x05FA0000 | (SCB->AIRCR & 0x70) | SCB_AIRCR_SYSRESETREQ);
asm volatile ("dsb");
for (;;);
}
const uint8_t sys_version[8] __attribute__((section(".sys.version"))) = {
3*2+2, /* bLength */
0x03, /* bDescriptorType = USB_STRING_DESCRIPTOR_TYPE */
/* sys version: "3.0" */
'3', 0, '.', 0, '0', 0,
};
#if defined(USE_SYS3) || defined(USE_SYS_BOARD_ID)
const uint32_t __attribute__((section(".sys.board_id")))
sys_board_id = BOARD_ID;
const uint8_t __attribute__((section(".sys.board_name")))
sys_board_name[] = BOARD_NAME;
#endif
/* Not yet implemented, API should be reconsidered */
@@ -133,26 +178,3 @@ flash_erase_all_and_exec (void (*entry)(void))
{
(void)entry;
}
void
nvic_system_reset (void)
{
SCB->AIRCR = (0x05FA0000 | (SCB->AIRCR & 0x70) | SCB_AIRCR_SYSRESETREQ);
asm volatile ("dsb");
for (;;);
}
const uint8_t sys_version[8] __attribute__((section(".sys.version"))) = {
3*2+2, /* bLength */
0x03, /* bDescriptorType = USB_STRING_DESCRIPTOR_TYPE */
/* sys version: "3.0" */
'3', 0, '.', 0, '0', 0,
};
#if defined(USE_SYS3) || defined(USE_SYS_BOARD_ID)
const uint32_t __attribute__((section(".sys.board_id")))
sys_board_id = BOARD_ID;
const uint8_t __attribute__((section(".sys.board_name")))
sys_board_name[] = BOARD_NAME;
#endif