diff --git a/include/libopencm3/stm32/g0/syscfg.h b/include/libopencm3/stm32/g0/syscfg.h
new file mode 100644
index 00000000..dfa0f997
--- /dev/null
+++ b/include/libopencm3/stm32/g0/syscfg.h
@@ -0,0 +1,325 @@
+/** @defgroup syscfg_defines SYSCFG Defines
+ *
+ * @ingroup STM32G0xx_defines
+ *
+ * @brief Defined Constants and Types for the STM32G0xx System Configuration controller
+ *
+ * @version 1.0.0
+ *
+ * @author @htmlonly © @endhtmlonly 2019
+ * Guillaume Revaillot
+ *
+ * LGPL License Terms @ref lgpl_license
+ */
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library. If not, see .
+ */
+
+#ifndef LIBOPENCM3_SYSCFG_H
+#define LIBOPENCM3_SYSCFG_H
+
+/**@{*/
+
+/**@defgroup syscfg_registers SYSCFG Registers
+ @{*/
+#define SYSCFG_CFGR1 MMIO32(SYSCFG_BASE + 0x00)
+#define SYSCFG_CFGR2 MMIO32(SYSCFG_BASE + 0x18)
+
+#define SYSCFG_ITLINE(line) MMIO32(SYSCFG_BASE + 0x80 + (line)*4)
+/**@}*/
+
+/** @defgroup syscfg_cfgr1 CFGR1 SYSCFG configuration register 1
+@{*/
+
+
+/** SYSCFG_CFGR1_I2C_PA10_FMP FM+ enable for PA10 */
+#define SYSCFG_CFGR1_I2C_PA10_FMP (1 << 23)
+
+/** SYSCFG_CFGR1_I2C_PA9_FMP FM+ enable for PA9 */
+#define SYSCFG_CFGR1_I2C_PA9_FMP (1 << 22)
+
+/** SYSCFG_CFGR1_I2C2_FMP FM+ driving capability activation for I2C2 */
+#define SYSCFG_CFGR1_I2C2_FMP (1 << 21)
+
+/** SYSCFG_CFGR1_I2C1_FMP FM+ driving capability activation for I2C1 */
+#define SYSCFG_CFGR1_I2C1_FMP (1 << 20)
+
+/** SYSCFG_CFGR1_I2C_PB9_FMP FM+ enable for PB9 */
+#define SYSCFG_CFGR1_I2C_PB9_FMP (1 << 19)
+
+/** SYSCFG_CFGR1_I2C_PB8_FMP FM+ enable for PB8 */
+#define SYSCFG_CFGR1_I2C_PB8_FMP (1 << 18)
+
+/** SYSCFG_CFGR1_I2C_PB7_FMP FM+ enable for PB7 */
+#define SYSCFG_CFGR1_I2C_PB7_FMP (1 << 17)
+
+/** SYSCFG_CFGR1_I2C_PB6_FMP FM+ enable for PB6 */
+#define SYSCFG_CFGR1_I2C_PB6_FMP (1 << 16)
+
+/** SYSCFG_CFGR1_UCPD2_STROBE Strobe signal bit for UCPD2 */
+#define SYSCFG_CFGR1_UCPD2_STROBE (1 << 10)
+
+/** SYSCFG_CFGR1_UCPD1_STROBE Strobe signal bit for UCPD1 */
+#define SYSCFG_CFGR1_UCPD1_STROBE (1 << 9)
+
+/** SYSCFG_CFGR1_BOOSTEN I/O analog switch voltage booster enable */
+#define SYSCFG_CFGR1_BOOSTEN (1 << 8)
+
+#define SYSCFG_CFGR1_IR_MOD_SHIFT 6
+#define SYSCFG_CFGR1_IR_MOD_MASK 0x03
+/** @defgroup syscfg_cfgr1_ir_mod IR MOD
+* @brief IR Modulation Envelope signal selection.
+@{*/
+#define SYSCFG_CFGR1_IR_MOD_TIM16 0
+#define SYSCFG_CFGR1_IR_MOD_USART1 1
+#define SYSCFG_CFGR1_IR_MOD_USART4 2
+/**@}*/
+
+/** SYSCFG_CFGR1_IR_POL IR output polarity selection */
+#define SYSCFG_CFGR1_IR_POL (1 << 5)
+
+/** SYSCFG_CFGR1_PA12_RMP PA12 pin remapping */
+#define SYSCFG_CFGR1_PA12_RMP (1 << 4)
+
+/** SYSCFG_CFGR1_PA11_RMP PA11 pin remapping */
+#define SYSCFG_CFGR1_PA11_RMP (1 << 3)
+
+#define SYSCFG_CFGR1_MEM_MODE_SHIFT 0
+#define SYSCFG_CFGR1_MEM_MODE_MASK 0x03
+/** @defgroup syscfg_cfgr1_mem_mode MEM MODE
+* @brief Memory mapping selection bits
+@{*/
+#define SYSCFG_CFGR1_MEM_MODE_FLASH 0
+#define SYSCFG_CFGR1_MEM_MODE_SYSTEM 1
+#define SYSCFG_CFGR1_MEM_MODE_SRAM 3
+/**@}*/
+
+/**@}*/
+
+
+/** @defgroup syscfg_cfgr2 CFGR2 SYSCFG configuration register 2
+@{*/
+
+/** SYSCFG_CFGR2_SRAM_PEF SRAM parity error flag */
+#define SYSCFG_CFGR2_SRAM_PEF (1 << 8)
+
+/** SYSCFG_CFGR2_ECC_LOCK ECC error lock bit */
+#define SYSCFG_CFGR2_ECC_LOCK (1 << 3)
+
+/** SYSCFG_CFGR2_PVD_LOCK PVD lock enable bit */
+#define SYSCFG_CFGR2_PVD_LOCK (1 << 2)
+
+/** SYSCFG_CFGR2_SRAM_PARITY_LOCK SRAM parity lock bit */
+#define SYSCFG_CFGR2_SRAM_PARITY_LOCK (1 << 1)
+
+/** SYSCFG_CFGR2_LOCKUP_LOCK Cortex-M0+ LOCKUP bit enable bit */
+#define SYSCFG_CFGR2_LOCKUP_LOCK (1 << 0)
+
+/**@}*/
+
+/** @defgroup syscfg_itline0 ITLINE0 interrupt line 0 status register
+@{*/
+#define SYSCFG_ITLINE0_WWDG (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline1 ITLINE1 interrupt line 1 status register
+@{*/
+#define SYSCFG_ITLINE1_PVDOUT (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline2 ITLINE2 interrupt line 2 status register
+@{*/
+#define SYSCFG_ITLINE2_RTC (1 << 1)
+#define SYSCFG_ITLINE2_TAMP (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline3 ITLINE3 interrupt line 3 status register
+@{*/
+#define SYSCFG_ITLINE3_FLASH_ECC (1 << 1)
+#define SYSCFG_ITLINE3_FLASH_ITF (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline4 ITLINE4 interrupt line 4 status register
+@{*/
+#define SYSCFG_ITLINE4_RCC (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline5 ITLINE5 interrupt line 5 status register
+@{*/
+#define SYSCFG_ITLINE5_EXTI1 (1 << 1)
+#define SYSCFG_ITLINE5_EXTI0 (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline6 ITLINE6 interrupt line 6 status register
+@{*/
+#define SYSCFG_ITLINE6_EXTI3 (1 << 1)
+#define SYSCFG_ITLINE6_EXTI2 (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline7 ITLINE7 interrupt line 7 status register
+@{*/
+#define SYSCFG_ITLINE7_EXTI15 (1 << 11)
+#define SYSCFG_ITLINE7_EXTI14 (1 << 10)
+#define SYSCFG_ITLINE7_EXTI13 (1 << 9)
+#define SYSCFG_ITLINE7_EXTI12 (1 << 8)
+#define SYSCFG_ITLINE7_EXTI11 (1 << 7)
+#define SYSCFG_ITLINE7_EXTI10 (1 << 6)
+#define SYSCFG_ITLINE7_EXTI9 (1 << 5)
+#define SYSCFG_ITLINE7_EXTI8 (1 << 4)
+#define SYSCFG_ITLINE7_EXTI7 (1 << 3)
+#define SYSCFG_ITLINE7_EXTI6 (1 << 2)
+#define SYSCFG_ITLINE7_EXTI5 (1 << 1)
+#define SYSCFG_ITLINE7_EXTI4 (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline8 ITLINE8 interrupt line 8 status register
+@{*/
+#define SYSCFG_ITLINE8_UCPD2 (1 << 1)
+#define SYSCFG_ITLINE8_UCPD1 (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline9 ITLINE9 interrupt line 9 status register
+@{*/
+#define SYSCFG_ITLINE9_DMA1_CH1 (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline10 ITLINE10 interrupt line 10 status register
+@{*/
+#define SYSCFG_ITLINE10_DMA1_CH3 (1 << 1)
+#define SYSCFG_ITLINE10_DMA1_CH2 (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline11 ITLINE11 interrupt line 11 status register
+@{*/
+#define SYSCFG_ITLINE11_DMA1_CH7 (1 << 4)
+#define SYSCFG_ITLINE11_DMA1_CH6 (1 << 3)
+#define SYSCFG_ITLINE11_DMA1_CH5 (1 << 2)
+#define SYSCFG_ITLINE11_DMA1_CH4 (1 << 1)
+#define SYSCFG_ITLINE11_DMAMUX (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline12 ITLINE12 interrupt line 12 status register
+@{*/
+#define SYSCFG_ITLINE12_COMP2 (1 << 2)
+#define SYSCFG_ITLINE12_COMP1 (1 << 1)
+#define SYSCFG_ITLINE12_ADC (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline13 ITLINE13 interrupt line 13 status register
+@{*/
+#define SYSCFG_ITLINE13_TIM1_BRK (1 << 3)
+#define SYSCFG_ITLINE13_TIM1_UPD (1 << 2)
+#define SYSCFG_ITLINE13_TIM1_TRG (1 << 1)
+#define SYSCFG_ITLINE13_TIM1_CCU (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline14 ITLINE14 interrupt line 14 status register
+@{*/
+#define SYSCFG_ITLINE14_TIM1_CC (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline15 ITLINE15 interrupt line 15 status register
+@{*/
+#define SYSCFG_ITLINE15_TIM2 (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline16 ITLINE16 interrupt line 16 status register
+@{*/
+#define SYSCFG_ITLINE16_TIM3 (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline17 ITLINE17 interrupt line 17 status register
+@{*/
+#define SYSCFG_ITLINE17_LPTIM1 (1 << 2)
+#define SYSCFG_ITLINE17_DAC (1 << 1)
+#define SYSCFG_ITLINE17_TIM6 (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline18 ITLINE18 interrupt line 18 status register
+@{*/
+#define SYSCFG_ITLINE18_LPTIM2 (1 << 1)
+#define SYSCFG_ITLINE18_TIM7 (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline19 ITLINE19 interrupt line 19 status register
+@{*/
+#define SYSCFG_ITLINE19_TIM14 (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline20 ITLINE20 interrupt line 20 status register
+@{*/
+#define SYSCFG_ITLINE20_TIM15 (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline21 ITLINE21 interrupt line 21 status register
+@{*/
+#define SYSCFG_ITLINE21_TIM16 (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline22 ITLINE22 interrupt line 22 status register
+@{*/
+#define SYSCFG_ITLINE22_TIM17 (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline23 ITLINE23 interrupt line 23 status register
+@{*/
+#define SYSCFG_ITLINE23_I2C1 (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline24 ITLINE24 interrupt line 24 status register
+@{*/
+#define SYSCFG_ITLINE24_I2C2 (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline25 ITLINE25 interrupt line 25 status register
+@{*/
+#define SYSCFG_ITLINE25_SPI1 (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline26 ITLINE26 interrupt line 26 status register
+@{*/
+#define SYSCFG_ITLINE26_SPI2 (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline27 ITLINE27 interrupt line 27 status register
+@{*/
+#define SYSCFG_ITLINE27_USART1 (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline28 ITLINE28 interrupt line 28 status register
+@{*/
+#define SYSCFG_ITLINE28_USART2 (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline29 ITLINE29 interrupt line 29 status register
+@{*/
+#define SYSCFG_ITLINE29_LPUART1 (1 << 2)
+#define SYSCFG_ITLINE29_USART4 (1 << 1)
+#define SYSCFG_ITLINE29_USART3 (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline30 ITLINE30 interrupt line 30 status register
+@{*/
+#define SYSCFG_ITLINE30_CEC (1 << 0)
+/**@}*/
+
+/** @defgroup syscfg_itline31 ITLINE31 interrupt line 31 status register
+@{*/
+#define SYSCFG_ITLINE31_AES (1 << 1)
+#define SYSCFG_ITLINE31_RNG (1 << 0)
+/**@}*/
+
+#endif
diff --git a/include/libopencm3/stm32/syscfg.h b/include/libopencm3/stm32/syscfg.h
index 8e78c475..cbd07b27 100644
--- a/include/libopencm3/stm32/syscfg.h
+++ b/include/libopencm3/stm32/syscfg.h
@@ -36,6 +36,8 @@
# include
#elif defined(STM32L4)
# include
+#elif defined(STM32G0)
+# include
#else
# error "stm32 family not defined."
#endif