stm32f0: New target STM32F0 added.

Signed-off-by: Eugene Krashtan <Eugene.Krashtan@opensynergy.com>

src/stm32f0/log.c

@@ -0,0 +1,79 @@
+/*
+ * log.c
+ * This file not required for regular Klipper usage, but hw/sw developer
+ * can use USART TX pin instead SWO for debugging purposes
+ *
+ *  Created on: Jan 17, 2019
+ *      Author: eug
+ */
+
+#include "string.h"
+#include "stm32f0xx_hal.h"
+#include "log.h"
+
+UART_HandleTypeDef huart2;
+
+void LogInit(void)
+{
+    huart2.Instance = USART2;
+    huart2.Init.BaudRate = 115200;
+    huart2.Init.WordLength = UART_WORDLENGTH_8B;
+    huart2.Init.StopBits = UART_STOPBITS_1;
+    huart2.Init.Parity = UART_PARITY_NONE;
+    huart2.Init.Mode = UART_MODE_TX;
+    huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
+    huart2.Init.OverSampling = UART_OVERSAMPLING_16;
+    huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
+    huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
+    HAL_UART_Init(&huart2);
+
+    lprint("hello");
+}
+
+/**
+* @brief String out
+* @param msg: Null-terminated string
+* @retval None
+*/
+void lprint(char *msg)
+{
+    HAL_UART_Transmit(&huart2, (uint8_t *)msg, strlen(msg), 100);
+}
+
+/**
+* @brief Binary data out
+* @param msg: binary data
+* @param len: data length
+* @retval None
+*/
+void lnprint(char *msg, size_t len)
+{
+    HAL_UART_Transmit(&huart2, (uint8_t *)msg, len, 100);
+}
+
+/**
+* @brief UART MSP Initialization
+* @param huart: UART handle pointer
+* @retval None
+*/
+void HAL_UART_MspInit(UART_HandleTypeDef* huart)
+{
+
+  GPIO_InitTypeDef GPIO_InitStruct = {0};
+  if(huart->Instance==USART2)
+  {
+    __HAL_RCC_USART2_CLK_ENABLE();
+
+    __HAL_RCC_GPIOA_CLK_ENABLE();
+    /**USART2 GPIO Configuration
+    PA2     ------> USART2_TX
+    PA3     ------> USART2_RX
+    */
+    GPIO_InitStruct.Pin = GPIO_PIN_2|GPIO_PIN_3;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
+    GPIO_InitStruct.Alternate = GPIO_AF1_USART2;
+    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+  }
+}