add Chapter07

Chapter07/error_handling/hal/uart/src/uart_stm32.cpp

@@ -0,0 +1,31 @@
+#include <uart_stm32.hpp>
+
+hal::uart_stm32::uart_stm32(USART_TypeDef *inst)
+    : instance_(inst)
+{
+}
+
+void hal::uart_stm32::init(std::uint32_t baudrate)
+{
+    huart_.Instance = instance_;
+    huart_.Init.BaudRate = baudrate;
+    huart_.Init.WordLength = UART_WORDLENGTH_8B;
+    huart_.Init.StopBits = UART_STOPBITS_1;
+    huart_.Init.Parity = UART_PARITY_NONE;
+    huart_.Init.Mode = UART_MODE_TX_RX;
+    huart_.Init.HwFlowCtl = UART_HWCONTROL_NONE;
+    huart_.Init.OverSampling = UART_OVERSAMPLING_16;
+    huart_.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
+    huart_.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
+    // TODO: add GPIO initialization for real hardware
+    huart_.MspInitCallback = nullptr;
+    HAL_UART_Init(&huart_);
+}
+
+void hal::uart_stm32::write_array(const char * ptr, std::size_t len)
+{
+    // we must cast away costness due to ST HAL's API
+    char * data_ptr = const_cast<char *>(ptr);
+    HAL_UART_Transmit(&huart_, reinterpret_cast<uint8_t *>(data_ptr), len,
+                      HAL_MAX_DELAY);
+}