diff options
| -rw-r--r-- | src/STM32F0xx_init.c | 193 | ||||
| -rw-r--r-- | src/main.c | 3 |
2 files changed, 111 insertions, 85 deletions
diff --git a/src/STM32F0xx_init.c b/src/STM32F0xx_init.c index 9e3c382..47c81d4 100644 --- a/src/STM32F0xx_init.c +++ b/src/STM32F0xx_init.c @@ -1,85 +1,108 @@ -#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.
- *
- * You can adapt this function to fit your needs, however, do not change its
- * name! It is called in the startup code.
- */
-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;
-}
+#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. + * + * You can adapt this function to fit your needs, however, do not change its + * name! It is called in the startup code. + */ +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; +} + +// These symbols are provided by the linker +extern void (*__preinit_array_start[])(); +extern void (*__preinit_array_end[])(); +extern void (*__init_array_start[])(); +extern void (*__init_array_end[])(); + +/** + * Calls the functions in the preinit and init arrays. The start and end + * addresses of these arrays are provided by the linker. + * + * You can adapt this function to fit your needs, however, do not change its + * name! It is called in the startup code. + */ +void __main () { + for (void (**f)() = __preinit_array_start; f < __preinit_array_end; ++f) { + (*f)(); + } + + for (void (**f)() = __init_array_start; f < __init_array_end; ++f) { + (*f)(); + } +} @@ -24,4 +24,7 @@ int main (void) { delay(500); } + + // Return 0 to satisfy compiler + return 0; } |