uart config seems good for now

dmx receiving with ftdi and qlc+ works

Inc/main.h

@@ -41,7 +41,8 @@ extern "C" {
 
 /* Exported constants --------------------------------------------------------*/
 /* USER CODE BEGIN EC */
-
+#define BUFFER_SIZE 515
+extern uint8_t rxBuffer[BUFFER_SIZE];
 /* USER CODE END EC */
 
 /* Exported macro ------------------------------------------------------------*/

Makefile

@@ -1,208 +1,208 @@
-##########################################################################################################################
-# File automatically-generated by tool: [projectgenerator] version: [4.2.0-B44] date: [Thu Apr 17 14:18:12 CEST 2025] 
-##########################################################################################################################
-
-# ------------------------------------------------
-# Generic Makefile (based on gcc)
-#
-# ChangeLog :
-#	2017-02-10 - Several enhancements + project update mode
-#   2015-07-22 - first version
-# ------------------------------------------------
-
-######################################
-# target
-######################################
-TARGET = Parafraktor
-
-
-######################################
-# building variables
-######################################
-# debug build?
-DEBUG = 1
-# optimization
-OPT = -Og
-
-
-#######################################
-# paths
-#######################################
-# Build path
-BUILD_DIR = build
-
-######################################
-# source
-######################################
-# C sources
-C_SOURCES =  \
-Src/main.c \
-Src/stm32g0xx_it.c \
-Src/stm32g0xx_hal_msp.c \
-Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_tim.c \
-Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_tim_ex.c \
-Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_rcc.c \
-Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_rcc_ex.c \
-Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_ll_rcc.c \
-Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_flash.c \
-Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_flash_ex.c \
-Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_gpio.c \
-Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_dma.c \
-Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_dma_ex.c \
-Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_ll_dma.c \
-Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_pwr.c \
-Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_pwr_ex.c \
-Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_cortex.c \
-Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal.c \
-Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_exti.c \
-Drivers/RTT/RTT/SEGGER_RTT.c \
-Drivers/RTT/RTT/SEGGER_RTT_printf.c \
-Drivers/RTT/Syscalls/SEGGER_RTT_Syscalls_GCC.c \
-Src/system_stm32g0xx.c
-
-# ASM sources
-ASM_SOURCES =  \
-startup_stm32g0b1xx.s
-
-# ASM sources
-ASMM_SOURCES = 
-
-
-#######################################
-# binaries
-#######################################
-PREFIX = arm-none-eabi-
-# The gcc compiler bin path can be either defined in make command via GCC_PATH variable (> make GCC_PATH=xxx)
-# either it can be added to the PATH environment variable.
-ifdef GCC_PATH
-CC = $(GCC_PATH)/$(PREFIX)gcc
-AS = $(GCC_PATH)/$(PREFIX)gcc -x assembler-with-cpp
-CP = $(GCC_PATH)/$(PREFIX)objcopy
-SZ = $(GCC_PATH)/$(PREFIX)size
-else
-CC = $(PREFIX)gcc
-AS = $(PREFIX)gcc -x assembler-with-cpp
-CP = $(PREFIX)objcopy
-SZ = $(PREFIX)size
-endif
-HEX = $(CP) -O ihex
-BIN = $(CP) -O binary -S
- 
-#######################################
-# CFLAGS
-#######################################
-# cpu
-CPU = -mcpu=cortex-m0plus
-
-# fpu
-# NONE for Cortex-M0/M0+/M3
-
-# float-abi
-
-
-# mcu
-MCU = $(CPU) -mthumb $(FPU) $(FLOAT-ABI)
-
-# macros for gcc
-# AS defines
-AS_DEFS = 
-
-# C defines
-C_DEFS =  \
--DUSE_HAL_DRIVER \
--DSTM32G0B1xx
-
-
-# AS includes
-AS_INCLUDES = 
-
-# C includes
-C_INCLUDES =  \
--IInc \
--IDrivers/STM32G0xx_HAL_Driver/Inc \
--IDrivers/STM32G0xx_HAL_Driver/Inc/Legacy \
--IDrivers/CMSIS/Device/ST/STM32G0xx/Include \
--IDrivers/CMSIS/Include \
--IDrivers/RTT/Config \
--IDrivers/RTT/RTT
-
-
-# compile gcc flags
-ASFLAGS = $(MCU) $(AS_DEFS) $(AS_INCLUDES) $(OPT) -Wall -fdata-sections -ffunction-sections
-
-CFLAGS += $(MCU) $(C_DEFS) $(C_INCLUDES) $(OPT) -Wall -fdata-sections -ffunction-sections
-
-ifeq ($(DEBUG), 1)
-CFLAGS += -g -gdwarf-2
-endif
-
-
-# Generate dependency information
-CFLAGS += -MMD -MP -MF"$(@:%.o=%.d)"
-
-
-#######################################
-# LDFLAGS
-#######################################
-# link script
-LDSCRIPT = STM32G0B1VETx_FLASH.ld
-
-# libraries
-LIBS = -lc -lm -lnosys 
-LIBDIR = 
-LDFLAGS = $(MCU) -specs=nano.specs -T$(LDSCRIPT) $(LIBDIR) $(LIBS) -Wl,-Map=$(BUILD_DIR)/$(TARGET).map,--cref -Wl,--gc-sections
-
-# default action: build all
-all: $(BUILD_DIR)/$(TARGET).elf $(BUILD_DIR)/$(TARGET).hex $(BUILD_DIR)/$(TARGET).bin
-	echo $(CFLAGS) | sed -E 's/ /\n/g' > compile_flags.txt
-
-
-#######################################
-# build the application
-#######################################
-# list of objects
-OBJECTS = $(addprefix $(BUILD_DIR)/,$(notdir $(C_SOURCES:.c=.o)))
-vpath %.c $(sort $(dir $(C_SOURCES)))
-# list of ASM program objects
-OBJECTS += $(addprefix $(BUILD_DIR)/,$(notdir $(ASM_SOURCES:.s=.o)))
-vpath %.s $(sort $(dir $(ASM_SOURCES)))
-OBJECTS += $(addprefix $(BUILD_DIR)/,$(notdir $(ASMM_SOURCES:.S=.o)))
-vpath %.S $(sort $(dir $(ASMM_SOURCES)))
-
-$(BUILD_DIR)/%.o: %.c Makefile | $(BUILD_DIR) 
-	$(CC) -c $(CFLAGS) -Wa,-a,-ad,-alms=$(BUILD_DIR)/$(notdir $(<:.c=.lst)) $< -o $@
-
-$(BUILD_DIR)/%.o: %.s Makefile | $(BUILD_DIR)
-	$(AS) -c $(CFLAGS) $< -o $@
-$(BUILD_DIR)/%.o: %.S Makefile | $(BUILD_DIR)
-	$(AS) -c $(CFLAGS) $< -o $@
-
-$(BUILD_DIR)/$(TARGET).elf: $(OBJECTS) Makefile
-	$(CC) $(OBJECTS) $(LDFLAGS) -o $@
-	$(SZ) $@
-
-$(BUILD_DIR)/%.hex: $(BUILD_DIR)/%.elf | $(BUILD_DIR)
-	$(HEX) $< $@
-	
-$(BUILD_DIR)/%.bin: $(BUILD_DIR)/%.elf | $(BUILD_DIR)
-	$(BIN) $< $@	
-	
-$(BUILD_DIR):
-	mkdir $@		
-
-#######################################
-# clean up
-#######################################
-clean:
-	-rm -fR $(BUILD_DIR)
-
-program: clean all
-	#gdb-multiarch bin/stm32_executable.elf -ex "target extended-remote :3333" -ex "monitor rtt stop" -ex "load" -ex "b main" -ex "c" -ex "n" -ex "monitor rtt start" -ex "detach" -ex "exit"
-	gdb-multiarch build/Parafraktor.elf -ex "target extended-remote :2331" -ex "monitor reset" -ex "load" -ex "monitor go" -ex "detach" -ex "exit"
-  
-#######################################
-# dependencies
-#######################################
--include $(wildcard $(BUILD_DIR)/*.d)
-
-# *** EOF ***
+##########################################################################################################################
+# File automatically-generated by tool: [projectgenerator] version: [4.2.0-B44] date: [Fri Apr 25 22:56:53 CEST 2025] 
+##########################################################################################################################
+
+# ------------------------------------------------
+# Generic Makefile (based on gcc)
+#
+# ChangeLog :
+#	2017-02-10 - Several enhancements + project update mode
+#   2015-07-22 - first version
+# ------------------------------------------------
+
+######################################
+# target
+######################################
+TARGET = Parafraktor
+
+
+######################################
+# building variables
+######################################
+# debug build?
+DEBUG = 1
+# optimization
+OPT = -Og
+
+
+#######################################
+# paths
+#######################################
+# Build path
+BUILD_DIR = build
+
+######################################
+# source
+######################################
+# C sources
+C_SOURCES =  \
+Src/main.c \
+Src/stm32g0xx_it.c \
+Src/stm32g0xx_hal_msp.c \
+Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_tim.c \
+Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_tim_ex.c \
+Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_rcc.c \
+Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_rcc_ex.c \
+Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_ll_rcc.c \
+Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_flash.c \
+Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_flash_ex.c \
+Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_gpio.c \
+Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_dma.c \
+Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_dma_ex.c \
+Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_ll_dma.c \
+Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_pwr.c \
+Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_pwr_ex.c \
+Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_cortex.c \
+Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal.c \
+Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_exti.c \
+Drivers/RTT/RTT/SEGGER_RTT.c \
+Drivers/RTT/RTT/SEGGER_RTT_printf.c \
+Drivers/RTT/Syscalls/SEGGER_RTT_Syscalls_GCC.c \
+Src/system_stm32g0xx.c
+
+# ASM sources
+ASM_SOURCES =  \
+startup_stm32g0b1xx.s
+
+# ASM sources
+ASMM_SOURCES = 
+
+
+#######################################
+# binaries
+#######################################
+PREFIX = arm-none-eabi-
+# The gcc compiler bin path can be either defined in make command via GCC_PATH variable (> make GCC_PATH=xxx)
+# either it can be added to the PATH environment variable.
+ifdef GCC_PATH
+CC = $(GCC_PATH)/$(PREFIX)gcc
+AS = $(GCC_PATH)/$(PREFIX)gcc -x assembler-with-cpp
+CP = $(GCC_PATH)/$(PREFIX)objcopy
+SZ = $(GCC_PATH)/$(PREFIX)size
+else
+CC = $(PREFIX)gcc
+AS = $(PREFIX)gcc -x assembler-with-cpp
+CP = $(PREFIX)objcopy
+SZ = $(PREFIX)size
+endif
+HEX = $(CP) -O ihex
+BIN = $(CP) -O binary -S
+ 
+#######################################
+# CFLAGS
+#######################################
+# cpu
+CPU = -mcpu=cortex-m0plus
+
+# fpu
+# NONE for Cortex-M0/M0+/M3
+
+# float-abi
+
+
+# mcu
+MCU = $(CPU) -mthumb $(FPU) $(FLOAT-ABI)
+
+# macros for gcc
+# AS defines
+AS_DEFS = 
+
+# C defines
+C_DEFS =  \
+-DUSE_HAL_DRIVER \
+-DSTM32G0B1xx
+
+
+# AS includes
+AS_INCLUDES = 
+
+# C includes
+C_INCLUDES =  \
+-IInc \
+-IDrivers/STM32G0xx_HAL_Driver/Inc \
+-IDrivers/STM32G0xx_HAL_Driver/Inc/Legacy \
+-IDrivers/CMSIS/Device/ST/STM32G0xx/Include \
+-IDrivers/CMSIS/Include \
+-IDrivers/RTT/Config \
+-IDrivers/RTT/RTT
+
+
+# compile gcc flags
+ASFLAGS = $(MCU) $(AS_DEFS) $(AS_INCLUDES) $(OPT) -Wall -fdata-sections -ffunction-sections
+
+CFLAGS += $(MCU) $(C_DEFS) $(C_INCLUDES) $(OPT) -Wall -fdata-sections -ffunction-sections
+
+ifeq ($(DEBUG), 1)
+CFLAGS += -g -gdwarf-2
+endif
+
+
+# Generate dependency information
+CFLAGS += -MMD -MP -MF"$(@:%.o=%.d)"
+
+
+#######################################
+# LDFLAGS
+#######################################
+# link script
+LDSCRIPT = STM32G0B1VETx_FLASH.ld
+
+# libraries
+LIBS = -lc -lm -lnosys 
+LIBDIR = 
+LDFLAGS = $(MCU) -specs=nano.specs -T$(LDSCRIPT) $(LIBDIR) $(LIBS) -Wl,-Map=$(BUILD_DIR)/$(TARGET).map,--cref -Wl,--gc-sections
+
+# default action: build all
+all: $(BUILD_DIR)/$(TARGET).elf $(BUILD_DIR)/$(TARGET).hex $(BUILD_DIR)/$(TARGET).bin
+	echo $(CFLAGS) | sed -E 's/ /\n/g' > compile_flags.txt
+
+
+#######################################
+# build the application
+#######################################
+# list of objects
+OBJECTS = $(addprefix $(BUILD_DIR)/,$(notdir $(C_SOURCES:.c=.o)))
+vpath %.c $(sort $(dir $(C_SOURCES)))
+# list of ASM program objects
+OBJECTS += $(addprefix $(BUILD_DIR)/,$(notdir $(ASM_SOURCES:.s=.o)))
+vpath %.s $(sort $(dir $(ASM_SOURCES)))
+OBJECTS += $(addprefix $(BUILD_DIR)/,$(notdir $(ASMM_SOURCES:.S=.o)))
+vpath %.S $(sort $(dir $(ASMM_SOURCES)))
+
+$(BUILD_DIR)/%.o: %.c Makefile | $(BUILD_DIR) 
+	$(CC) -c $(CFLAGS) -Wa,-a,-ad,-alms=$(BUILD_DIR)/$(notdir $(<:.c=.lst)) $< -o $@
+
+$(BUILD_DIR)/%.o: %.s Makefile | $(BUILD_DIR)
+	$(AS) -c $(CFLAGS) $< -o $@
+$(BUILD_DIR)/%.o: %.S Makefile | $(BUILD_DIR)
+	$(AS) -c $(CFLAGS) $< -o $@
+
+$(BUILD_DIR)/$(TARGET).elf: $(OBJECTS) Makefile
+	$(CC) $(OBJECTS) $(LDFLAGS) -o $@
+	$(SZ) $@
+
+$(BUILD_DIR)/%.hex: $(BUILD_DIR)/%.elf | $(BUILD_DIR)
+	$(HEX) $< $@
+	
+$(BUILD_DIR)/%.bin: $(BUILD_DIR)/%.elf | $(BUILD_DIR)
+	$(BIN) $< $@	
+	
+$(BUILD_DIR):
+	mkdir $@		
+
+#######################################
+# clean up
+#######################################
+clean:
+	-rm -fR $(BUILD_DIR)
+
+program: clean all
+	#gdb-multiarch bin/stm32_executable.elf -ex "target extended-remote :3333" -ex "monitor rtt stop" -ex "load" -ex "b main" -ex "c" -ex "n" -ex "monitor rtt start" -ex "detach" -ex "exit"
+	gdb-multiarch build/Parafraktor.elf -ex "target extended-remote :2331" -ex "monitor reset" -ex "load" -ex "monitor go" -ex "detach" -ex "exit"
+  
+#######################################
+# dependencies
+#######################################
+-include $(wildcard $(BUILD_DIR)/*.d)
+
+# *** EOF ***

Parafraktor.ioc

@@ -64,47 +64,47 @@ ProjectManager.ToolChainLocation=
 ProjectManager.UAScriptAfterPath=
 ProjectManager.UAScriptBeforePath=
 ProjectManager.UnderRoot=false
-ProjectManager.functionlistsort=1-SystemClock_Config-RCC-false-HAL-false
-RCC.ADCFreq_Value=8000000
-RCC.AHBFreq_Value=8000000
-RCC.APBFreq_Value=8000000
-RCC.APBTimFreq_Value=8000000
+ProjectManager.functionlistsort=1-SystemClock_Config-RCC-false-HAL-false,2-MX_GPIO_Init-GPIO-false-HAL-true,3-MX_USART1_UART_Init-USART1-false-HAL-true
+RCC.ADCFreq_Value=32000000
+RCC.AHBFreq_Value=32000000
+RCC.APBFreq_Value=32000000
+RCC.APBTimFreq_Value=32000000
 RCC.CECFreq_Value=32786.88524590164
-RCC.CortexFreq_Value=8000000
+RCC.CortexFreq_Value=32000000
 RCC.EXTERNAL_CLOCK_VALUE=48000
-RCC.FCLKCortexFreq_Value=8000000
-RCC.FDCANFreq_Value=8000000
+RCC.FCLKCortexFreq_Value=32000000
+RCC.FDCANFreq_Value=32000000
 RCC.FamilyName=M
-RCC.HCLKFreq_Value=8000000
+RCC.HCLKFreq_Value=32000000
 RCC.HSE_VALUE=8000000
 RCC.HSI48_VALUE=48000000
 RCC.HSI_VALUE=16000000
-RCC.I2C1Freq_Value=8000000
-RCC.I2C2Freq_Value=8000000
-RCC.I2S1Freq_Value=8000000
-RCC.I2S2Freq_Value=8000000
+RCC.I2C1Freq_Value=32000000
+RCC.I2C2Freq_Value=32000000
+RCC.I2S1Freq_Value=32000000
+RCC.I2S2Freq_Value=32000000
 RCC.IPParameters=ADCFreq_Value,AHBFreq_Value,APBFreq_Value,APBTimFreq_Value,CECFreq_Value,CortexFreq_Value,EXTERNAL_CLOCK_VALUE,FCLKCortexFreq_Value,FDCANFreq_Value,FamilyName,HCLKFreq_Value,HSE_VALUE,HSI48_VALUE,HSI_VALUE,I2C1Freq_Value,I2C2Freq_Value,I2S1Freq_Value,I2S2Freq_Value,LPTIM1Freq_Value,LPTIM2Freq_Value,LPUART1Freq_Value,LPUART2Freq_Value,LSCOPinFreq_Value,LSE_VALUE,LSI_VALUE,MCO1PinFreq_Value,MCO2PinFreq_Value,PLLPoutputFreq_Value,PLLQoutputFreq_Value,PLLRCLKFreq_Value,PLLSourceVirtual,PWRFreq_Value,SYSCLKFreq_VALUE,SYSCLKSource,TIM15Freq_Value,TIM1Freq_Value,USART1Freq_Value,USART2Freq_Value,USART3Freq_Value,USBFreq_Value,VCOInputFreq_Value,VCOOutputFreq_Value
-RCC.LPTIM1Freq_Value=8000000
-RCC.LPTIM2Freq_Value=8000000
-RCC.LPUART1Freq_Value=8000000
-RCC.LPUART2Freq_Value=8000000
+RCC.LPTIM1Freq_Value=32000000
+RCC.LPTIM2Freq_Value=32000000
+RCC.LPUART1Freq_Value=32000000
+RCC.LPUART2Freq_Value=32000000
 RCC.LSCOPinFreq_Value=32000
 RCC.LSE_VALUE=32768
 RCC.LSI_VALUE=32000
-RCC.MCO1PinFreq_Value=8000000
-RCC.MCO2PinFreq_Value=8000000
+RCC.MCO1PinFreq_Value=32000000
+RCC.MCO2PinFreq_Value=32000000
 RCC.PLLPoutputFreq_Value=32000000
 RCC.PLLQoutputFreq_Value=32000000
 RCC.PLLRCLKFreq_Value=32000000
 RCC.PLLSourceVirtual=RCC_PLLSOURCE_HSE
-RCC.PWRFreq_Value=8000000
-RCC.SYSCLKFreq_VALUE=8000000
-RCC.SYSCLKSource=RCC_SYSCLKSOURCE_HSE
-RCC.TIM15Freq_Value=8000000
-RCC.TIM1Freq_Value=8000000
-RCC.USART1Freq_Value=8000000
-RCC.USART2Freq_Value=8000000
-RCC.USART3Freq_Value=8000000
+RCC.PWRFreq_Value=32000000
+RCC.SYSCLKFreq_VALUE=32000000
+RCC.SYSCLKSource=RCC_SYSCLKSOURCE_PLLCLK
+RCC.TIM15Freq_Value=32000000
+RCC.TIM1Freq_Value=32000000
+RCC.USART1Freq_Value=32000000
+RCC.USART2Freq_Value=32000000
+RCC.USART3Freq_Value=32000000
 RCC.USBFreq_Value=48000000
 RCC.VCOInputFreq_Value=8000000
 RCC.VCOOutputFreq_Value=64000000

Src/main.c

@@ -18,12 +18,14 @@
 /* USER CODE END Header */
 /* Includes ------------------------------------------------------------------*/
 #include "main.h"
-#include "SEGGER_RTT.h"
-#include <stdio.h>
 
 /* Private includes ----------------------------------------------------------*/
 /* USER CODE BEGIN Includes */
-
+#include "SEGGER_RTT.h"
+#include "stm32g0b1xx.h"
+#include "stm32g0xx_hal_cortex.h"
+#include <stdint.h>
+#include <stdio.h>
 /* USER CODE END Includes */
 
 /* Private typedef -----------------------------------------------------------*/
@@ -56,32 +58,107 @@ static void MX_GPIO_Init(void);
 
 /* Private user code ---------------------------------------------------------*/
 /* USER CODE BEGIN 0 */
+#define BUFFER_SIZE 515
+uint8_t rxBuffer[BUFFER_SIZE];
+uint16_t rxBufferPos = 0;
 
+void init_UART1(){
+    RCC->APBENR2 |= RCC_APBENR2_USART1EN;
+    RCC->IOPENR |= RCC_IOPENR_GPIOCEN;
+
+    GPIOC->MODER &= ~GPIO_MODER_MODE5; // Alternate function mode on RX pin
+    GPIOC->MODER |= GPIO_MODER_MODE5_1;
+    GPIOC->AFR[0] &= GPIO_AFRL_AFSEL5;
+    GPIOC->AFR[0] |= 1 << GPIO_AFRL_AFSEL5_Pos;
+
+    USART1->BRR = 128; // 32000000÷250000
+    USART1->CR1 = USART_CR1_RE;
+
+    USART1->CR3 |= USART_CR3_EIE;
+    USART1->CR1 |= USART_CR1_RXNEIE_RXFNEIE;
+
+    USART1->CR1 |= USART_CR1_UE;
+
+    HAL_NVIC_SetPriority(USART1_IRQn, 0, 0);
+    HAL_NVIC_EnableIRQ(USART1_IRQn);
+}
 /* USER CODE END 0 */
 
+void USART1_IRQHandler(){
+     if(USART1->ISR & USART_ISR_RXNE_RXFNE){
+         //printf("%x ", USART1->RDR);
+         rxBuffer[rxBufferPos++] = USART1->RDR;
+         if(rxBufferPos >= BUFFER_SIZE){
+             rxBufferPos = 0;
+         }
+     }
+
+     if(USART1->ISR & USART_ISR_FE){
+         USART1->ICR = USART_ICR_FECF;
+         printf("FE after %d\n",rxBufferPos);
+         rxBufferPos = 0;
+         printf("buf: ");
+         for(uint16_t i=0; i<10; i++)
+             printf("0x%02X ", rxBuffer[i]);
+         printf("\n");
+     }
+     if(USART1->ISR & USART_ISR_ORE){
+         USART1->ICR = USART_ICR_ORECF;
+         printf("ORE\n");
+     }
+     if(USART1->ISR & USART_ISR_NE){
+         USART1->ICR = USART_ICR_NECF;
+         printf("NE\n");
+     }
+     if(USART1->ISR & USART_ISR_UDR){
+         USART1->ICR = USART_ICR_UDRCF;
+         printf("UDR\n");
+     }
+}
+
 /**
   * @brief  The application entry point.
   * @retval int
   */
 int main(void)
 {
+  /* USER CODE BEGIN 1 */
+  SEGGER_RTT_ConfigUpBuffer(0, NULL, NULL, 0, SEGGER_RTT_MODE_BLOCK_IF_FIFO_FULL);
+  printf("Moin!\n");
+  /* USER CODE END 1 */
+
   /* MCU Configuration--------------------------------------------------------*/
 
   /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
   HAL_Init();
 
+  /* USER CODE BEGIN Init */
+
+  /* USER CODE END Init */
+
   /* Configure the system clock */
   SystemClock_Config();
 
+  /* USER CODE BEGIN SysInit */
+
+  /* USER CODE END SysInit */
+
   /* Initialize all configured peripherals */
   MX_GPIO_Init();
+  /* USER CODE BEGIN 2 */
+  init_UART1(); 
+  /* USER CODE END 2 */
 
-  SEGGER_RTT_ConfigUpBuffer(0, NULL, NULL, 0, SEGGER_RTT_MODE_BLOCK_IF_FIFO_FULL);
-  printf("Moin!\n");
-
+  /* Infinite loop */
+  /* USER CODE BEGIN WHILE */
+  //HAL_UART_Receive_DMA(&huart1, rxBuffer, BUFFER_SIZE);
   while (1)
   {
+    /* USER CODE END WHILE */
+
+    /* USER CODE BEGIN 3 */
   }
+  /* USER CODE END 3 */
 }
 
 /**
@@ -102,7 +179,13 @@ void SystemClock_Config(void)
   */
   RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
   RCC_OscInitStruct.HSEState = RCC_HSE_ON;
-  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
+  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+  RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV1;
+  RCC_OscInitStruct.PLL.PLLN = 8;
+  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
+  RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
+  RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
   if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
   {
     Error_Handler();
@@ -112,11 +195,11 @@ void SystemClock_Config(void)
   */
   RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                               |RCC_CLOCKTYPE_PCLK1;
-  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSE;
+  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
   RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
   RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
 
-  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
+  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
   {
     Error_Handler();
   }

Src/stm32g0xx_it.c

@@ -22,6 +22,7 @@
 #include "stm32g0xx_it.h"
 /* Private includes ----------------------------------------------------------*/
 /* USER CODE BEGIN Includes */
+#include "stdio.h"
 /* USER CODE END Includes */
 
 /* Private typedef -----------------------------------------------------------*/