EMTime/libopencm3-examples
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

stm32f3: usb: use proper clocks

Browse Source 
Don't use the HSI clock, that's not specced for USB use.
Also, drop the unnecessary delays that were working around old bugs.
This commit is contained in:
Karl Palsson
2018-08-29 10:26:59 +00:00
parent 8faca31dc5
commit 3527ce407e
1 changed files with 3 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
examples/stm32/f3/stm32f3-discovery/usb_cdcacm/cdcacm.c
View File

@@ -236,7 +236,6 @@ static void cdcacm_set_config(usbd_device *usbd_dev, uint16_t wValue)
static void usb_setup(void) static void usb_setup(void)
{ {
/* Enable clocks for GPIO port A and USB peripheral. */ /* Enable clocks for GPIO port A and USB peripheral. */
rcc_usb_prescale_1();
rcc_periph_clock_enable(RCC_USB); rcc_periph_clock_enable(RCC_USB);
rcc_periph_clock_enable(RCC_GPIOA); rcc_periph_clock_enable(RCC_GPIOA);
@@ -247,20 +246,16 @@ static void usb_setup(void)
int main(void) int main(void)
{ {
int i;
usbd_device *usbd_dev; usbd_device *usbd_dev;
rcc_clock_setup_hsi(&rcc_hsi_8mhz[RCC_CLOCK_48MHZ]); rcc_clock_setup_pll(&rcc_hse8mhz_configs[RCC_CLOCK_HSE8_72MHZ]);
usb_setup(); usb_setup();
usbd_dev = usbd_init(&st_usbfs_v1_usb_driver, &dev, &config, usb_strings, usbd_dev = usbd_init(&st_usbfs_v1_usb_driver, &dev, &config, usb_strings,
3, usbd_control_buffer, sizeof(usbd_control_buffer)); 3, usbd_control_buffer, sizeof(usbd_control_buffer));
usbd_register_set_config_callback(usbd_dev, cdcacm_set_config); usbd_register_set_config_callback(usbd_dev, cdcacm_set_config);
for (i = 0; i < 0x800000; i++) while (1) {
__asm__("nop");
while (1)
usbd_poll(usbd_dev); usbd_poll(usbd_dev);
}
} }