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-rw-r--r--olsndot/firmware/Makefile44
-rw-r--r--olsndot/firmware/main.c124
-rw-r--r--olsndot/firmware/stm32_flash.ld124
-rw-r--r--olsndot/firmware/system_stm32f0xx.c336
4 files changed, 628 insertions, 0 deletions
diff --git a/olsndot/firmware/Makefile b/olsndot/firmware/Makefile
new file mode 100644
index 0000000..cf338eb
--- /dev/null
+++ b/olsndot/firmware/Makefile
@@ -0,0 +1,44 @@
+# put your *.o targets here, make should handle the rest!
+CMSIS_PATH ?= STM32Cube/Drivers/CMSIS
+CMSIS_DEV_PATH ?= $(CMSIS_PATH)/Device/ST/STM32F0xx
+HAL_PATH ?= STM32Cube/Drivers/STM32F0xx_HAL_Driver
+
+CC := arm-none-eabi-gcc
+OBJCOPY := arm-none-eabi-objcopy
+OBJDUMP := arm-none-eabi-objdump
+SIZE := arm-none-eabi-size
+
+CFLAGS = -Wall -g -std=gnu11 -Os
+CFLAGS += -mlittle-endian -mcpu=cortex-m0 -march=armv6-m -mthumb
+CFLAGS += -ffunction-sections -fdata-sections
+CFLAGS += -Wl,--gc-sections -Wl,-Map=main.map
+
+# Technically we're using an STM32F030F4, but apart from the TSSOP20 package that one is largely identical to the
+# STM32F030*6 and there is no separate device header provided for it, so we're faking a *6 device here. This is
+# even documented in stm32f0xx.h. Thanks ST!
+CFLAGS += -DSTM32F030x6
+
+CFLAGS += -Tstm32_flash.ld
+CFLAGS += -I$(CMSIS_DEV_PATH)/Include -I$(CMSIS_PATH)/Include -I$(HAL_PATH)/Inc -Iconfig
+CFLAGS += -L$(CMSIS_PATH)/Lib/GCC -larm_cortexM0l_math
+
+###################################################
+
+.PHONY: program clean
+
+all: main.elf
+
+main.elf: main.c startup_stm32f030x6.s system_stm32f0xx.c $(HAL_PATH)/Src/stm32f0xx_ll_utils.c
+ $(CC) $(CFLAGS) -o $@ $^
+ $(OBJCOPY) -O ihex $@ $(@:.elf=.hex)
+ $(OBJCOPY) -O binary $@ $(@:.elf=.bin)
+ $(OBJDUMP) -St $@ >$(@:.elf=.lst)
+ $(SIZE) $@
+
+program: main.elf openocd.cfg
+ openocd -f openocd.cfg -c "program $< verify reset exit"
+
+clean:
+ rm -f *.o
+ rm -f main.elf main.hex main.bin main.map main.lst
+
diff --git a/olsndot/firmware/main.c b/olsndot/firmware/main.c
new file mode 100644
index 0000000..a4029c1
--- /dev/null
+++ b/olsndot/firmware/main.c
@@ -0,0 +1,124 @@
+
+#include <stm32f0xx.h>
+#include <stdint.h>
+#include <system_stm32f0xx.h>
+#include <stm32f0xx_ll_utils.h>
+/*
+ * Part number: STM32F030F4C6
+ */
+
+int main(void) {
+ LL_Init1msTick(SystemCoreClock);
+
+ RCC->AHBENR |= RCC_AHBENR_GPIOAEN | RCC_AHBENR_GPIOBEN;
+ RCC->APB2ENR |= RCC_APB2ENR_SPI1EN | RCC_APB2ENR_TIM1EN | RCC_APB2ENR_USART1EN | RCC_APB2ENR_ADCEN;
+
+ GPIOA->MODER |=
+ (3<<GPIO_MODER_MODER0_Pos) /* PA0 - Current measurement analog input */
+ | (1<<GPIO_MODER_MODER1_Pos) /* PA1 - RS485 TX enable */
+ | (2<<GPIO_MODER_MODER2_Pos) /* PA2 - RS485 TX */
+ | (2<<GPIO_MODER_MODER3_Pos) /* PA3 - RS485 RX */
+ | (1<<GPIO_MODER_MODER4_Pos) /* PA4 - LED1 open-drain output */
+ | (2<<GPIO_MODER_MODER5_Pos) /* PA5 - Shift register clk/SCLK */
+ | (1<<GPIO_MODER_MODER6_Pos) /* PA6 - LED2 open-drain output */
+ | (2<<GPIO_MODER_MODER7_Pos) /* PA7 - Shift register data/MOSI */
+ | (2<<GPIO_MODER_MODER9_Pos) /* PA9 - Shift register clear (TIM1_CH2) */
+ | (2<<GPIO_MODER_MODER10_Pos);/* PA10 - Shift register strobe (TIM1_CH3) */
+ GPIOB->MODER |=
+ (1<<GPIO_MODER_MODER1_Pos); /* PB1 - Current measurement range selection */
+
+
+ GPIOA->OTYPER |= GPIO_OTYPER_OT_6 | GPIO_OTYPER_OT_4; /* LED outputs -> open drain */
+
+ /* Set shift register IO GPIO output speed */
+ GPIOA->OSPEEDR |=
+ (1<<GPIO_OSPEEDR_OSPEEDR5_Pos) /* SCLK */
+ | (1<<GPIO_OSPEEDR_OSPEEDR7_Pos) /* MOSI */
+ | (1<<GPIO_OSPEEDR_OSPEEDR9_Pos) /* Clear */
+ | (1<<GPIO_OSPEEDR_OSPEEDR10_Pos);/* Strobe */
+
+ GPIOA->AFR[0] |=
+ (1<<GPIO_AFRL_AFRL2_Pos) /* USART1_TX */
+ | (1<<GPIO_AFRL_AFRL3_Pos) /* USART1_RX */
+ | (0<<GPIO_AFRL_AFRL5_Pos) /* SPI1_SCK */
+ | (0<<GPIO_AFRL_AFRL7_Pos); /* SPI1_MOSI */
+ GPIOA->AFR[1] |=
+ (2<<GPIO_AFRH_AFRH1_Pos) /* TIM1_CH2 */
+ | (2<<GPIO_AFRH_AFRH2_Pos); /* TIM1_CH3 */
+
+ GPIOB->BSRR = GPIO_BSRR_BR_1; /* clear output is active low */
+
+ /* Configure SPI controller */
+ /* CPOL=0, CPHA=0, prescaler=8 -> 1MBd */
+// SPI1->CR1 = SPI_CR1_BIDIMODE | SPI_CR1_BIDIOE | SPI_CR1_SSM | SPI_CR1_SSI | SPI_CR1_SPE | (2<<SPI_CR1_BR_Pos) | SPI_CR1_MSTR;
+ SPI1->CR1 = SPI_CR1_BIDIMODE | SPI_CR1_BIDIOE | SPI_CR1_SSM | SPI_CR1_SSI | SPI_CR1_SPE | (7<<SPI_CR1_BR_Pos) | SPI_CR1_MSTR;
+ SPI1->CR2 = (7<<SPI_CR2_DS_Pos);
+ /* Configure TIM1 for display strobe generation */
+ /* Configure UART for RS485 comm */
+ /* 8N1, 115200Bd */
+ TIM1->CR1 = TIM_CR1_ARPE; //TIM_CR1_OPM |
+ TIM1->PSC = 256; // debug
+ TIM1->CCMR1 = (6<<TIM_CCMR1_OC2M_Pos) | TIM_CCMR1_OC2PE | (6<<TIM_CCMR1_OC1M_Pos) | TIM_CCMR1_OC1PE;
+ TIM1->CCMR2 = (6<<TIM_CCMR2_OC3M_Pos) | TIM_CCMR2_OC3PE;
+ TIM1->CCER = TIM_CCER_CC1E | TIM_CCER_CC2E | TIM_CCER_CC3E;
+ TIM1->BDTR = TIM_BDTR_MOE;
+ TIM1->RCR = 2;
+ TIM1->CCR1 = 1;
+ TIM1->CCR3 = 2; /* strobe */
+ TIM1->ARR = 16384;
+// TIM1->DIER = TIM_DIER_CC1IE;
+
+ NVIC_EnableIRQ(TIM1_CC_IRQn);
+ NVIC_SetPriority(TIM1_CC_IRQn, 2);
+
+ TIM1->EGR |= TIM_EGR_UG;
+ TIM1->CR1 |= TIM_CR1_CEN;
+
+ for (;;) {
+ }
+}
+
+#define NBITS 4
+uint8_t brightness_by_bit[NBITS] = {
+ 0x11, 0x22, 0x44, 0x88
+};
+
+void TIM1_CC_IRQHandler(void) {
+ static uint32_t bitpos = 0;
+ bitpos = (bitpos+1)&(NBITS-1);
+
+// SPI1->DR = ((uint32_t)brightness_by_bit[bitpos])<<8;
+ SPI1->DR = (bitpos<<8) | (bitpos<<10) | (bitpos<<12) | (bitpos<<14);
+ while (SPI1->SR & SPI_SR_BSY);
+
+ const uint32_t cycles_strobe = 2;
+ const uint32_t cycles_clear = 2;
+ const uint32_t base_val = 16;
+ uint32_t period = base_val<<bitpos;
+
+ TIM1->ARR = 128;//period;
+// TIM1->CCR3 = cycles_strobe; /* strobe */
+// TIM1->CCR2 = period-cycles_clear; /* clear */
+// TIM1->EGR |= TIM_EGR_UG;
+ TIM1->CR1 |= TIM_CR1_CEN;
+// TIM1->ARR = cycles_strobe+1;
+// GPIOA->BSRR = GPIO_BSRR_BR_4 | GPIO_BSRR_BS_6;
+}
+
+void NMI_Handler(void) {
+}
+
+void HardFault_Handler(void) {
+ for(;;);
+}
+
+void SVC_Handler(void) {
+}
+
+
+void PendSV_Handler(void) {
+}
+
+void SysTick_Handler(void) {
+}
+
diff --git a/olsndot/firmware/stm32_flash.ld b/olsndot/firmware/stm32_flash.ld
new file mode 100644
index 0000000..927e8b4
--- /dev/null
+++ b/olsndot/firmware/stm32_flash.ld
@@ -0,0 +1,124 @@
+
+ENTRY(Reset_Handler)
+
+MEMORY {
+ FLASH (rx): ORIGIN = 0x08000000, LENGTH = 16K
+ RAM (xrw): ORIGIN = 0x20000000, LENGTH = 4K
+}
+
+/* highest address of the user mode stack */
+_estack = 0x20001000;
+
+SECTIONS {
+ /* for Cortex devices, the beginning of the startup code is stored in the .isr_vector section, which goes to FLASH */
+ .isr_vector : {
+ . = ALIGN(4);
+ KEEP(*(.isr_vector)) /* Startup code */
+ . = ALIGN(4);
+ } >FLASH
+
+ /* the program code is stored in the .text section, which goes to Flash */
+ .text : {
+ . = ALIGN(4);
+
+ *(.text) /* normal code */
+ *(.text.*) /* -ffunction-sections code */
+ *(.rodata) /* read-only data (constants) */
+ *(.rodata*) /* -fdata-sections read only data */
+ *(.glue_7) /* TBD - needed ? */
+ *(.glue_7t) /* TBD - needed ? */
+
+ /* Necessary KEEP sections (see http://sourceware.org/ml/newlib/2005/msg00255.html) */
+ KEEP (*(.init))
+ KEEP (*(.fini))
+
+ . = ALIGN(4);
+ _etext = .;
+ /* This is used by the startup in order to initialize the .data section */
+ _sidata = _etext;
+ } >FLASH
+
+ /* This is the initialized data section
+ The program executes knowing that the data is in the RAM
+ but the loader puts the initial values in the FLASH (inidata).
+ It is one task of the startup to copy the initial values from FLASH to RAM. */
+ .data : AT ( _sidata ) {
+ . = ALIGN(4);
+ /* This is used by the startup in order to initialize the .data secion */
+ _sdata = . ;
+ _data = . ;
+
+ *(.data)
+ *(.data.*)
+ *(.RAMtext)
+
+ . = ALIGN(4);
+ /* This is used by the startup in order to initialize the .data secion */
+ _edata = . ;
+ } >RAM
+
+ /* This is the uninitialized data section */
+ .bss : {
+ . = ALIGN(4);
+ /* This is used by the startup in order to initialize the .bss secion */
+ _sbss = .;
+ _bss = .;
+
+ *(.bss)
+ *(.bss.*) /* patched by elias - allows the use of -fdata-sections */
+ *(COMMON)
+
+ . = ALIGN(4);
+ /* This is used by the startup in order to initialize the .bss secion */
+ _ebss = . ;
+ } >RAM
+
+ PROVIDE ( end = _ebss);
+ PROVIDE (_end = _ebss);
+
+ __exidx_start = .;
+ __exidx_end = .;
+
+ /* after that it's only debugging information. */
+
+ /* remove the debugging information from the standard libraries */
+ /DISCARD/ : {
+ libc.a ( * )
+ libm.a ( * )
+ libgcc.a ( * )
+ }
+
+ /* Stabs debugging sections. */
+ .stab 0 : { *(.stab) }
+ .stabstr 0 : { *(.stabstr) }
+ .stab.excl 0 : { *(.stab.excl) }
+ .stab.exclstr 0 : { *(.stab.exclstr) }
+ .stab.index 0 : { *(.stab.index) }
+ .stab.indexstr 0 : { *(.stab.indexstr) }
+ .comment 0 : { *(.comment) }
+ /* DWARF debug sections.
+ Symbols in the DWARF debugging sections are relative to the beginning
+ of the section so we begin them at 0. */
+ /* DWARF 1 */
+ .debug 0 : { *(.debug) }
+ .line 0 : { *(.line) }
+ /* GNU DWARF 1 extensions */
+ .debug_srcinfo 0 : { *(.debug_srcinfo) }
+ .debug_sfnames 0 : { *(.debug_sfnames) }
+ /* DWARF 1.1 and DWARF 2 */
+ .debug_aranges 0 : { *(.debug_aranges) }
+ .debug_pubnames 0 : { *(.debug_pubnames) }
+ /* DWARF 2 */
+ .debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) }
+ .debug_abbrev 0 : { *(.debug_abbrev) }
+ .debug_line 0 : { *(.debug_line) }
+ .debug_frame 0 : { *(.debug_frame) }
+ .debug_str 0 : { *(.debug_str) }
+ .debug_loc 0 : { *(.debug_loc) }
+ .debug_macinfo 0 : { *(.debug_macinfo) }
+ /* SGI/MIPS DWARF 2 extensions */
+ .debug_weaknames 0 : { *(.debug_weaknames) }
+ .debug_funcnames 0 : { *(.debug_funcnames) }
+ .debug_typenames 0 : { *(.debug_typenames) }
+ .debug_varnames 0 : { *(.debug_varnames) }
+}
diff --git a/olsndot/firmware/system_stm32f0xx.c b/olsndot/firmware/system_stm32f0xx.c
new file mode 100644
index 0000000..c578424
--- /dev/null
+++ b/olsndot/firmware/system_stm32f0xx.c
@@ -0,0 +1,336 @@
+/**
+ ******************************************************************************
+ * @file system_stm32f0xx.c
+ * copied from: STM32Cube/Drivers/CMSIS/Device/ST/STM32F0xx/Source/Templates
+ * @author MCD Application Team
+ * @version V2.3.1
+ * @date 04-November-2016
+ * @brief CMSIS Cortex-M0 Device Peripheral Access Layer System Source File.
+ *
+ * 1. This file provides two functions and one global variable to be called from
+ * user application:
+ * - SystemInit(): This function is called at startup just after reset and
+ * before branch to main program. This call is made inside
+ * the "startup_stm32f0xx.s" file.
+ *
+ * - SystemCoreClock variable: Contains the core clock (HCLK), it can be used
+ * by the user application to setup the SysTick
+ * timer or configure other parameters.
+ *
+ * - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must
+ * be called whenever the core clock is changed
+ * during program execution.
+ *
+ * 2. After each device reset the HSI (8 MHz) is used as system clock source.
+ * Then SystemInit() function is called, in "startup_stm32f0xx.s" file, to
+ * configure the system clock before to branch to main program.
+ *
+ * 3. This file configures the system clock as follows:
+ *=============================================================================
+ * Supported STM32F0xx device
+ *-----------------------------------------------------------------------------
+ * System Clock source | HSI
+ *-----------------------------------------------------------------------------
+ * SYSCLK(Hz) | 8000000
+ *-----------------------------------------------------------------------------
+ * HCLK(Hz) | 8000000
+ *-----------------------------------------------------------------------------
+ * AHB Prescaler | 1
+ *-----------------------------------------------------------------------------
+ * APB1 Prescaler | 1
+ *-----------------------------------------------------------------------------
+ *=============================================================================
+ ******************************************************************************
+ * @attention
+ *
+ * <h2><center>&copy; COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. Neither the name of STMicroelectronics nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ ******************************************************************************
+ */
+
+/** @addtogroup CMSIS
+ * @{
+ */
+
+/** @addtogroup stm32f0xx_system
+ * @{
+ */
+
+/** @addtogroup STM32F0xx_System_Private_Includes
+ * @{
+ */
+
+#include "stm32f0xx.h"
+
+/**
+ * @}
+ */
+
+/** @addtogroup STM32F0xx_System_Private_TypesDefinitions
+ * @{
+ */
+
+/**
+ * @}
+ */
+
+/** @addtogroup STM32F0xx_System_Private_Defines
+ * @{
+ */
+#if !defined (HSE_VALUE)
+ #define HSE_VALUE ((uint32_t)8000000) /*!< Default value of the External oscillator in Hz.
+ This value can be provided and adapted by the user application. */
+#endif /* HSE_VALUE */
+
+#if !defined (HSI_VALUE)
+ #define HSI_VALUE ((uint32_t)8000000) /*!< Default value of the Internal oscillator in Hz.
+ This value can be provided and adapted by the user application. */
+#endif /* HSI_VALUE */
+
+#if !defined (HSI48_VALUE)
+#define HSI48_VALUE ((uint32_t)48000000) /*!< Default value of the HSI48 Internal oscillator in Hz.
+ This value can be provided and adapted by the user application. */
+#endif /* HSI48_VALUE */
+/**
+ * @}
+ */
+
+/** @addtogroup STM32F0xx_System_Private_Macros
+ * @{
+ */
+
+/**
+ * @}
+ */
+
+/** @addtogroup STM32F0xx_System_Private_Variables
+ * @{
+ */
+ /* This variable is updated in three ways:
+ 1) by calling CMSIS function SystemCoreClockUpdate()
+ 2) by calling HAL API function HAL_RCC_GetHCLKFreq()
+ 3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency
+ Note: If you use this function to configure the system clock there is no need to
+ call the 2 first functions listed above, since SystemCoreClock variable is
+ updated automatically.
+ */
+uint32_t SystemCoreClock = 8000000;
+
+const uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9};
+const uint8_t APBPrescTable[8] = {0, 0, 0, 0, 1, 2, 3, 4};
+
+/**
+ * @}
+ */
+
+/** @addtogroup STM32F0xx_System_Private_FunctionPrototypes
+ * @{
+ */
+
+/**
+ * @}
+ */
+
+/** @addtogroup STM32F0xx_System_Private_Functions
+ * @{
+ */
+
+/**
+ * @brief Setup the microcontroller system.
+ * Initialize the default HSI clock source, vector table location and the PLL configuration is reset.
+ * @param None
+ * @retval None
+ */
+void SystemInit(void)
+{
+ /* Reset the RCC clock configuration to the default reset state ------------*/
+ /* 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 /* STM32F051x8 or STM32F058x8 */
+
+ /* 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;
+
+}
+
+/**
+ * @brief Update SystemCoreClock variable according to Clock Register Values.
+ * The SystemCoreClock variable contains the core clock (HCLK), it can
+ * be used by the user application to setup the SysTick timer or configure
+ * other parameters.
+ *
+ * @note Each time the core clock (HCLK) changes, this function must be called
+ * to update SystemCoreClock variable value. Otherwise, any configuration
+ * based on this variable will be incorrect.
+ *
+ * @note - The system frequency computed by this function is not the real
+ * frequency in the chip. It is calculated based on the predefined
+ * constant and the selected clock source:
+ *
+ * - If SYSCLK source is HSI, SystemCoreClock will contain the HSI_VALUE(*)
+ *
+ * - If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(**)
+ *
+ * - If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(**)
+ * or HSI_VALUE(*) multiplied/divided by the PLL factors.
+ *
+ * (*) HSI_VALUE is a constant defined in stm32f0xx_hal.h file (default value
+ * 8 MHz) but the real value may vary depending on the variations
+ * in voltage and temperature.
+ *
+ * (**) HSE_VALUE is a constant defined in stm32f0xx_hal.h file (default value
+ * 8 MHz), user has to ensure that HSE_VALUE is same as the real
+ * frequency of the crystal used. Otherwise, this function may
+ * have wrong result.
+ *
+ * - The result of this function could be not correct when using fractional
+ * value for HSE crystal.
+ *
+ * @param None
+ * @retval None
+ */
+void SystemCoreClockUpdate (void)
+{
+ uint32_t tmp = 0, pllmull = 0, pllsource = 0, predivfactor = 0;
+
+ /* Get SYSCLK source -------------------------------------------------------*/
+ tmp = RCC->CFGR & RCC_CFGR_SWS;
+
+ switch (tmp)
+ {
+ case RCC_CFGR_SWS_HSI: /* HSI used as system clock */
+ SystemCoreClock = HSI_VALUE;
+ break;
+ case RCC_CFGR_SWS_HSE: /* HSE used as system clock */
+ SystemCoreClock = HSE_VALUE;
+ break;
+ case RCC_CFGR_SWS_PLL: /* PLL used as system clock */
+ /* Get PLL clock source and multiplication factor ----------------------*/
+ pllmull = RCC->CFGR & RCC_CFGR_PLLMUL;
+ pllsource = RCC->CFGR & RCC_CFGR_PLLSRC;
+ pllmull = ( pllmull >> 18) + 2;
+ predivfactor = (RCC->CFGR2 & RCC_CFGR2_PREDIV) + 1;
+
+ if (pllsource == RCC_CFGR_PLLSRC_HSE_PREDIV)
+ {
+ /* HSE used as PLL clock source : SystemCoreClock = HSE/PREDIV * PLLMUL */
+ SystemCoreClock = (HSE_VALUE/predivfactor) * pllmull;
+ }
+#if defined(STM32F042x6) || defined(STM32F048xx) || defined(STM32F072xB) || defined(STM32F078xx) || defined(STM32F091xC) || defined(STM32F098xx)
+ else if (pllsource == RCC_CFGR_PLLSRC_HSI48_PREDIV)
+ {
+ /* HSI48 used as PLL clock source : SystemCoreClock = HSI48/PREDIV * PLLMUL */
+ SystemCoreClock = (HSI48_VALUE/predivfactor) * pllmull;
+ }
+#endif /* STM32F042x6 || STM32F048xx || STM32F072xB || STM32F078xx || STM32F091xC || STM32F098xx */
+ else
+ {
+#if defined(STM32F042x6) || defined(STM32F048xx) || defined(STM32F070x6) \
+ || defined(STM32F078xx) || defined(STM32F071xB) || defined(STM32F072xB) \
+ || defined(STM32F070xB) || defined(STM32F091xC) || defined(STM32F098xx) || defined(STM32F030xC)
+ /* HSI used as PLL clock source : SystemCoreClock = HSI/PREDIV * PLLMUL */
+ SystemCoreClock = (HSI_VALUE/predivfactor) * pllmull;
+#else
+ /* HSI used as PLL clock source : SystemCoreClock = HSI/2 * PLLMUL */
+ SystemCoreClock = (HSI_VALUE >> 1) * pllmull;
+#endif /* STM32F042x6 || STM32F048xx || STM32F070x6 ||
+ STM32F071xB || STM32F072xB || STM32F078xx || STM32F070xB ||
+ STM32F091xC || STM32F098xx || STM32F030xC */
+ }
+ break;
+ default: /* HSI used as system clock */
+ SystemCoreClock = HSI_VALUE;
+ break;
+ }
+ /* Compute HCLK clock frequency ----------------*/
+ /* Get HCLK prescaler */
+ tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> 4)];
+ /* HCLK clock frequency */
+ SystemCoreClock >>= tmp;
+}
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
+