/* Set STM32 to 48 MHz. */
void clock_setup(void) {
rcc_clock_setup_in_hsi48_out_48mhz();
// Trim from USB sync frame
crs_autotrim_usb_enable();
rcc_set_usbclk_source(RCC_HSI48);
}
static void clk_tree_setup(void)
{
/* cf. rcc_clock_setup_in_hsi_out_48mhz */
rcc_osc_on(RCC_HSI);
rcc_wait_for_osc_ready(RCC_HSI);
rcc_set_sysclk_source(RCC_HSI);
rcc_osc_on(RCC_HSE);
rcc_wait_for_osc_ready(RCC_HSE);
rcc_osc_off(RCC_PLL);
rcc_wait_for_osc_not_ready(RCC_PLL);
flash_set_ws(FLASH_ACR_LATENCY_024_048MHZ);
#ifdef NUCLEO
rcc_set_pll_multiplication_factor(RCC_CFGR_PLLMUL_MUL6);
#else
/* 16MHz * 3 = 48MHz */
rcc_set_pll_multiplication_factor(RCC_CFGR_PLLMUL_MUL3);
#endif
rcc_set_pll_source(RCC_HSE);
rcc_osc_on(RCC_PLL);
rcc_wait_for_osc_ready(RCC_PLL);
rcc_set_sysclk_source(RCC_PLL);
rcc_set_hpre(RCC_CFGR_HPRE_NODIV);
rcc_set_ppre(RCC_CFGR_PPRE_NODIV);
rcc_apb1_frequency = 48000000UL;
rcc_ahb_frequency = 48000000UL;
rcc_set_usbclk_source(RCC_PLL);
}
void cdcacm_target_init(void)
{
/* start HSI48 */
rcc_clock_setup_in_hsi48_out_48mhz();
/* use usb SOF as correction source for HSI48 */
crs_autotrim_usb_enable();
/* use HSI48 for USB */
rcc_set_usbclk_source(RCC_HSI48);
/* usb HSI48 for system clock */
rcc_set_sysclk_source(RCC_HSI48);
}
int main(void)
{
rcc_clock_setup_in_hsi48_out_48mhz();
crs_autotrim_usb_enable();
rcc_set_usbclk_source(HSI48);
/* LED on for boot progress */
rcc_periph_clock_enable(RCC_GPIOC);
gpio_mode_setup(GPIOC, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO7);
gpio_set(GPIOC, GPIO7);
usbd_device *usbd_dev = gadget0_init(&st_usbfs_v2_usb_driver, "stm32f072disco");
ER_DPRINTF("bootup complete\n");
gpio_clear(GPIOC, GPIO7);
while (1) {
usbd_poll(usbd_dev);
}
}
int main(void) {
uint32_t i;
rcc_periph_clock_enable(BOARD_RCC_LED);
LED_ENABLE();
LED_BUSY();
/* Setup clock accordingly */
#ifdef GD32F103
rcc_clock_setup_in_hse_12mhz_out_120mhz();
#else
#ifdef STM32F0
rcc_clock_setup_in_hsi48_out_48mhz();
rcc_periph_clock_enable(RCC_SYSCFG_COMP);
SYSCFG_CFGR1 |= SYSCFG_CFGR1_PA11_PA12_RMP;
rcc_periph_clock_enable(RCC_CRS);
crs_autotrim_usb_enable();
rcc_set_usbclk_source(RCC_HSI48);
#else
rcc_clock_setup_in_hse_8mhz_out_72mhz();
#endif /* STM32F0 */
#endif /* GD32F103 */
rcc_periph_clock_enable(RCC_GPIOA); /* For USB */
/* STM32F0x2 has internal pullup and does not need AFIO */
#ifndef STM32F0
rcc_periph_clock_enable(BOARD_RCC_USB_PULLUP);
rcc_periph_clock_enable(RCC_AFIO); /* For SPI */
#endif /* STM32F0 */
#if BOARD_USE_DEBUG_PINS_AS_GPIO
gpio_primary_remap(AFIO_MAPR_SWJ_CFG_JTAG_OFF_SW_OFF, AFIO_MAPR_TIM2_REMAP_FULL_REMAP);
#endif
/* Setup GPIO to pull up the D+ high. (STM32F0x2 has internal pullup.) */
#ifndef STM32F0
gpio_set_mode(BOARD_PORT_USB_PULLUP, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, BOARD_PIN_USB_PULLUP);
#if BOARD_USB_HIGH_IS_PULLUP
gpio_set(BOARD_PORT_USB_PULLUP, BOARD_PIN_USB_PULLUP);
#else
gpio_clear(BOARD_PORT_USB_PULLUP, BOARD_PIN_USB_PULLUP);
#endif /* BOARD_USB_HIGH_IS_PULLUP */
#endif /* STM32F0 */
usbcdc_init();
spi_setup(SPI_DEFAULT_CLOCK);
/* The loop. */
while (true) {
/* Wait and blink if USB is not ready. */
LED_IDLE();
while (!usb_ready) {
LED_DISABLE();
for (i = 0; i < rcc_ahb_frequency / 150; i ++) {
asm("nop");
}
LED_ENABLE();
for (i = 0; i < rcc_ahb_frequency / 150; i ++) {
asm("nop");
}
}
/* Actual thing */
/* TODO: we are blocked here, hence no knowledge about USB bet reset. */
handle_command(usbcdc_getc());
}
return 0;
}
