static void usb_setup(void)
{
/* Enable clocks for GPIO port A (for GPIO_USART2_TX) and USART2. */
rcc_usb_prescale_1();
rcc_periph_clock_enable(RCC_USB);
rcc_periph_clock_enable(RCC_GPIOA);
/* Setup GPIO pin GPIO_USART2_TX/GPIO9 on GPIO port A for transmit. */
gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO11 | GPIO12);
gpio_set_af(GPIOA, GPIO_AF14, GPIO11| GPIO12);
}
int main() {
rcc_clock_setup_hsi(&hsi_8mhz[CLOCK_48MHZ]);
rcc_usb_prescale_1();
rcc_peripheral_reset(&RCC_APB1RSTR, RCC_APB1RSTR_USBRST);
rcc_peripheral_reset(&RCC_AHBRSTR, RCC_AHBRSTR_IOPARST);
rcc_peripheral_clear_reset(&RCC_APB1RSTR, RCC_APB1RSTR_USBRST);
rcc_peripheral_clear_reset(&RCC_AHBRSTR, RCC_AHBRSTR_IOPARST);
rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_USBEN);
rcc_peripheral_enable_clock(&RCC_AHBENR, RCC_AHBENR_IOPAEN);
gpio_mode_setup(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO11 | GPIO12);
gpio_clear(GPIOA, GPIO11 | GPIO12);
for (int i = 0; i < 0x800000; i++)
__asm__ volatile("nop");
gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO11 | GPIO12);
gpio_set_af(GPIOA, GPIO_AF14, GPIO11| GPIO12);
arm_bootloader::Dest dest = arm_bootloader::get_unique_dest();
char serial[10] = {0};
{
uint32_t x = dest;
char hex[] = "0123456789abcdef";
for(int i = 0; i < 8; i++) {
serial[7-i] = hex[x & 0xF];
x = x >> 4;
}
}
/* Buffer to be used for control requests. */
uint8_t usbd_control_buffer[128];
char const *usb_strings[] = {
"uf-mil",
"subbus",
serial,
};
usbd_device * usbd_dev = usbd_init(&stm32f103_usb_driver, &uf_subbus_protocol::usb::dev, &uf_subbus_protocol::usb::config, usb_strings, 3, usbd_control_buffer, sizeof(usbd_control_buffer));
usbd_register_set_config_callback(usbd_dev, cdcacm_set_config);
uf_subbus_protocol::usb::Sink sink(usbd_dev);
arm_bootloader::Handler handler(
sink,
dest,
2048);
handlerp = &handler;
while (1)
usbd_poll(usbd_dev);
}
/**
* Setup clocks to run from PLL.
* The arguments provide the pll source, multipliers, dividers, all that's
* needed to establish a system clock.
* @param clock clock information structure
*/
void rcc_clock_setup_pll(const struct rcc_clock_scale *clock)
{
if (clock->pllsrc == RCC_CFGR_PLLSRC_HSE_PREDIV) {
rcc_osc_on(RCC_HSE);
rcc_wait_for_osc_ready(RCC_HSE);
} else {
rcc_osc_on(RCC_HSI);
rcc_wait_for_osc_ready(RCC_HSI);
}
rcc_osc_off(RCC_PLL);
rcc_usb_prescale_1_5();
if (clock->usbdiv1) {
rcc_usb_prescale_1();
}
rcc_wait_for_osc_not_ready(RCC_PLL);
rcc_set_pll_source(clock->pllsrc);
rcc_set_pll_multiplier(clock->pllmul);
rcc_set_prediv(clock->plldiv);
/* Enable PLL oscillator and wait for it to stabilize. */
rcc_osc_on(RCC_PLL);
rcc_wait_for_osc_ready(RCC_PLL);
/* Configure flash settings. */
flash_prefetch_enable();
flash_set_ws(clock->flash_waitstates);
rcc_set_hpre(clock->hpre);
rcc_set_ppre2(clock->ppre2);
rcc_set_ppre1(clock->ppre1);
/* Select PLL as SYSCLK source. */
rcc_set_sysclk_source(RCC_CFGR_SW_PLL);
/* Wait for PLL clock to be selected. */
rcc_wait_for_sysclk_status(RCC_PLL);
/* Set the peripheral clock frequencies used. */
rcc_ahb_frequency = clock->ahb_frequency;
rcc_apb1_frequency = clock->apb1_frequency;
rcc_apb2_frequency = clock->apb2_frequency;
}
