80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
#include <stdint.h>
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#include <mcu/gd32vf103.h>
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static void __attribute__((used,section(".text.startup.1")))
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clock_init (void)
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{
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/* HXTAL setup */
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RCU->CTL |= RCU_CTL_HXTALEN;
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while (!(RCU->CTL & RCU_CTL_HXTALSTB))
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;
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RCU->CFG0 &= ~RCU_CFG0_AHB_APB1_APB2_MASK;
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/* CK_AHB = CK_SYS */
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RCU->CFG0 |= RCU_CFG0_AHB_CKSYS_DIV1;
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/* CK_APB2 = CK_AHB */
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RCU->CFG0 |= RCU_CFG0_APB2_CKAHB_DIV1;
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/* CK_APB1 = CK_AHB/2 */
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RCU->CFG0 |= RCU_CFG0_APB1_CKAHB_DIV2;
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/* CK_USBFS = 48MHz */
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RCU->CFG0 |= RCU_CFG0_USBFSPSC_DIV2;
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/* CK_ADC, CK_TIMER1xxx, CK_TIMER0, CK_I2S */
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/* PLL setup */
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RCU->CFG0 &= ~RCU_CFG0_PLLSRC_PLLMF_MASK;
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RCU->CFG0 |= RCU_CFG0_PLL_MUL_VALUE | RCU_CFG0_PLLSRC_HXTAL;
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RCU->CFG1 &= ~RCU_CFG1_PREDV0SEL_MASK;
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RCU->CFG1 |= RCU_CFG1_PREDV0SEL_HXTAL;
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RCU->CTL |= RCU_CTL_PLLEN;
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while (!(RCU->CTL & RCU_CTL_PLLSTB))
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;
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/* Select PLL as system clock */
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RCU->CFG0 &= ~RCU_CFG0_SCS_MASK;
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RCU->CFG0 |= RCU_CFG0_CKSYSSRC_PLL;
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/* Wait until PLL is selected as system clock */
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while (!(RCU->CFG0 & RCU_CFG0_SCSS_PLL))
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;
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/* Stop IRC8M */
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RCU->CTL &= ~RCU_CTL_IRC8MEN;
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/* Flash setup: TBD */
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}
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static void __attribute__((used,section(".text.startup.1")))
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gpio_init (void)
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{
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RCU->APB2EN |= RCU_APB2_GPIO;
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RCU->APB2RST = RCU_APB2_GPIO;
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RCU->APB2RST = 0;
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#ifdef AFIO_MAPR_SOMETHING
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AFIO->MAPR |= AFIO_MAPR_SOMETHING;
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#endif
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/* LED is mandatory. We configure it always. */
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GPIO_LED->ODR = VAL_GPIO_LED_ODR;
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GPIO_LED->CRH = VAL_GPIO_LED_CRH;
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GPIO_LED->CRL = VAL_GPIO_LED_CRL;
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/* If there is USB enabler pin and it's independent, we configure it. */
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#if defined(GPIO_USB) && defined(VAL_GPIO_USB_ODR)
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GPIO_USB->ODR = VAL_GPIO_USB_ODR;
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GPIO_USB->CRH = VAL_GPIO_USB_CRH;
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GPIO_USB->CRL = VAL_GPIO_USB_CRL;
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#endif
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#ifdef GPIO_OTHER
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GPIO_OTHER->ODR = VAL_GPIO_OTHER_ODR;
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GPIO_OTHER->CRH = VAL_GPIO_OTHER_CRH;
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GPIO_OTHER->CRL = VAL_GPIO_OTHER_CRL;
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#endif
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}
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