stm32g0: add timer.

Only tim2/3/7/14 have been really tested yet - but the others should
work as well.

include/libopencm3/stm32/g0/timer.h

@@ -0,0 +1,74 @@
+/** @defgroup timer_defines Timer Defines
+ *
+ * @ingroup STM32G0xx_defines
+ *
+ * @brief <b>Defined Constants and Types for the STM32G0xx Timers</b>
+ *
+ * @version 1.0.0
+ *
+ * LGPL License Terms @ref lgpl_license
+ *  */
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2019 Guillaume Revaillot <g.revaillot@gmail.com>
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef LIBOPENCM3_TIMER_H
+#define LIBOPENCM3_TIMER_H
+
+#include <libopencm3/stm32/common/timer_common_all.h>
+
+/**@{*/
+
+/* Option Register (TIMx_OR1) */
+#define TIM_OR1(tim_base)		MMIO32((tim_base) + 0x50)
+#define TIM2_OR1			TIM_OR1(TIM2)
+#define TIM3_OR1			TIM_OR1(TIM3)
+
+/* Alternate Function (TIMx_AF1) */
+#define TIM_AF1(tim_base)		MMIO32((tim_base) + 0x60)
+#define TIM2_AF1			TIM_AF1(TIM2)
+#define TIM3_AF1			TIM_AF1(TIM3)
+#define TIM16_AF1			TIM_AF1(TIM16)
+#define TIM17_AF1			TIM_AF1(TIM17)
+
+/* Input Selection Register (TIMx_TISEL) */
+#define TIM_TISEL(tim_base)		MMIO32((tim_base) + 0x68)
+#define TIM2_TISEL			TIM_TISEL(TIM2)
+#define TIM3_TISEL			TIM_TISEL(TIM3)
+#define TIM14_TISEL			TIM_TISEL(TIM14)
+#define TIM16_TISEL			TIM_TISEL(TIM16)
+#define TIM17_TISEL			TIM_TISEL(TIM17)
+
+/* --- TIMx_OR1 values ---------------------------------------------------- */
+
+/* OCREF_CLR: ocref_clr Source Selection */
+#define TIM_OR1_OCREF_CLR			(1 << 0)
+
+/** @defgroup tim_or1_ocref_clr TIM_OR1_OCREF_CLR Source Selection
+@{*/
+#define TIM_OR1_OCREF_CLR_COMP1			(0)
+#define TIM_OR1_OCREF_CLR_COMP2			(1)
+/**@}*/
+
+BEGIN_DECLS
+
+END_DECLS
+
+/**@}*/
+
+#endif

include/libopencm3/stm32/timer.h

@@ -40,6 +40,8 @@
 #       include <libopencm3/stm32/l1/timer.h>
 #elif defined(STM32L4)
 #       include <libopencm3/stm32/l4/timer.h>
+#elif defined(STM32G0)
+#       include <libopencm3/stm32/g0/timer.h>
 #else
 #       error "stm32 family not defined."
 #endif

lib/stm32/g0/Makefile

@@ -45,6 +45,7 @@ OBJS += spi_common_all.o spi_common_v1_frf.o
 OBJS += i2c_common_v2.o
 OBJS += rng_common_v1.o
 OBJS += crc_common_all.o
+OBJS += timer_common_all.o
 
 VPATH +=../:../../cm3:../common