diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/STM32F0xx_init.c | 82 | ||||
| -rw-r--r-- | src/main.c | 8 |
2 files changed, 83 insertions, 7 deletions
diff --git a/src/STM32F0xx_init.c b/src/STM32F0xx_init.c new file mode 100644 index 0000000..904d9c0 --- /dev/null +++ b/src/STM32F0xx_init.c @@ -0,0 +1,82 @@ +#include "STM32F0xx.h"
+#include "common.h"
+
+/**
+ * Initialize the HSI clock source and reset the PLL configuration. This
+ * function is called by the startup_common.s file, just before calling the
+ * main() function.
+ */
+void SystemInit (void) {
+ // Set HSION bit
+ RCC->CR |= (uint32_t)0x00000001U;
+
+#if defined (STM32F051x8) || \
+ defined (STM32F058x8)
+ // Reset SW[1:0], HPRE[3:0], PPRE[2:0], ADCPRE and MCOSEL[2:0] bits
+ RCC->CFGR &= (uint32_t)0xF8FFB80CU;
+#else
+ // Reset SW[1:0], HPRE[3:0], PPRE[2:0], ADCPRE, MCOSEL[2:0], MCOPRE[2:0] and PLLNODIV bits
+ RCC->CFGR &= (uint32_t)0x08FFB80CU;
+#endif
+
+ // Reset HSEON, CSSON and PLLON bits
+ RCC->CR &= (uint32_t)0xFEF6FFFFU;
+
+ // Reset HSEBYP bit
+ RCC->CR &= (uint32_t)0xFFFBFFFFU;
+
+ // Reset PLLSRC, PLLXTPRE and PLLMUL[3:0] bits
+ RCC->CFGR &= (uint32_t)0xFFC0FFFFU;
+
+ // Reset PREDIV[3:0] bits
+ RCC->CFGR2 &= (uint32_t)0xFFFFFFF0U;
+
+#if defined (STM32F072xB) || \
+ defined (STM32F078xx)
+ // Reset USART2SW[1:0], USART1SW[1:0], I2C1SW, CECSW, USBSW and ADCSW bits
+ RCC->CFGR3 &= (uint32_t)0xFFFCFE2CU;
+
+#elif defined (STM32F071xB)
+ // Reset USART2SW[1:0], USART1SW[1:0], I2C1SW, CECSW and ADCSW bits
+ RCC->CFGR3 &= (uint32_t)0xFFFFCEACU;
+
+#elif defined (STM32F091xC) || \
+ defined (STM32F098xx)
+ // Reset USART3SW[1:0], USART2SW[1:0], USART1SW[1:0], I2C1SW, CECSW and ADCSW bits
+ RCC->CFGR3 &= (uint32_t)0xFFF0FEACU;
+
+#elif defined (STM32F030x6) || \
+ defined (STM32F030x8) || \
+ defined (STM32F031x6) || \
+ defined (STM32F038xx) || \
+ defined (STM32F030xC)
+ // Reset USART1SW[1:0], I2C1SW and ADCSW bits
+ RCC->CFGR3 &= (uint32_t)0xFFFFFEECU;
+
+#elif defined (STM32F051x8) || \
+ defined (STM32F058xx)
+ // Reset USART1SW[1:0], I2C1SW, CECSW and ADCSW bits
+ RCC->CFGR3 &= (uint32_t)0xFFFFFEACU;
+
+#elif defined (STM32F042x6) || \
+ defined (STM32F048xx)
+ // Reset USART1SW[1:0], I2C1SW, CECSW, USBSW and ADCSW bits
+ RCC->CFGR3 &= (uint32_t)0xFFFFFE2CU;
+
+#elif defined (STM32F070x6) || \
+ defined (STM32F070xB)
+ // Reset USART1SW[1:0], I2C1SW, USBSW and ADCSW bits
+ RCC->CFGR3 &= (uint32_t)0xFFFFFE6CU;
+ // Set default USB clock to PLLCLK, since there is no HSI48
+ RCC->CFGR3 |= (uint32_t)0x00000080U;
+
+#else
+ #warning "No target selected"
+#endif
+
+ // Reset HSI14 bit
+ RCC->CR2 &= (uint32_t)0xFFFFFFFEU;
+
+ // Disable all interrupts
+ RCC->CIR = 0x00000000U;
+}
@@ -1,4 +1,4 @@ -#include <stm32f0xx.h> +#include "STM32F0xx.h" // Quick and dirty delay static void delay (unsigned int time) { @@ -12,12 +12,6 @@ int main (void) { // Put pin in general purpose output mode (B01) GPIOA->MODER |= GPIO_MODER_MODER4_0; - // Set the output type to push pull (B0 = default) - // GPIOA->OTYPER = ~GPIO_OTYPER_OT_4; - // Set the output speed to low (B00 = default) - // GPIOA->OSPEEDR &= ~GPIO_OSPEEDER_OSPEEDR4; - // Set the pull up/down resistors (B00 = default) - // GPIOA->PUPDR &= ~GPIO_PUPDR_PUPDR4; while (1) { // Reset the bit for port A4 |