Beginning of cross platform support

SHAL/Src/STM32F0XX/Peripheral/UART/SHAL_UART.cpp

@@ -0,0 +1,75 @@
+/**
+  ******************************************************************************
+  * @file    SHAL_TIM.h
+  * @author  Luca Lizaranzu
+  * @brief   Related to USART and SHAL_UART abstractions
+  ******************************************************************************
+  */
+
+
+#include "SHAL_UART.h"
+#include "SHAL_GPIO.h"
+
+void SHAL_UART::init(const UART_Pair pair){
+
+    m_UARTPair = pair;
+
+    SHAL_UART_Pair uart_pair = getUARTPair(pair); //Get the UART_PAIR information to be initialized
+
+    //Get the SHAL_GPIO pins for this SHAL_UART setup
+    GPIO_Key Tx_Key = uart_pair.TxKey; //Tx pin
+    GPIO_Key Rx_Key = uart_pair.RxKey; //Rx pin
+
+    GET_GPIO(Tx_Key).setPinMode(PinMode::ALTERNATE_FUNCTION_MODE);
+    GET_GPIO(Rx_Key).setPinMode(PinMode::ALTERNATE_FUNCTION_MODE);
+
+    GET_GPIO(Tx_Key).setAlternateFunction(uart_pair.TxAlternateFunctionMask);
+    GET_GPIO(Rx_Key).setAlternateFunction(uart_pair.RxAlternateFunctionMask);
+
+    SHAL_UART_ENABLE_REG pairUARTEnable = getUARTEnableReg(pair); //Register and mask to enable the SHAL_UART channel
+
+    *pairUARTEnable.reg |= pairUARTEnable.mask; //Enable SHAL_UART line
+
+
+}
+
+void SHAL_UART::begin(uint32_t baudRate) volatile {
+
+    USART_TypeDef* usart = getUARTPair(m_UARTPair).USARTReg;
+
+    usart->CR1 &= ~USART_CR1_UE; //Disable USART
+
+    usart->CR1 = 0; //Clear USART config
+
+    usart->CR1 = USART_CR1_TE | USART_CR1_RE; //Tx enable and Rx Enable
+
+    usart->BRR = 8000000 / baudRate; //MAKE SURE ANY FUNCTION THAT CHANGES CLOCK UPDATES THIS! //TODO DO NOT HARDCODE THIS SHIT
+
+    usart->CR1 |= USART_CR1_UE;
+
+}
+
+void SHAL_UART::sendString(const char *s) volatile {
+    while (*s) sendChar(*s++); //Send chars while we haven't reached end of s
+}
+
+void SHAL_UART::sendChar(char c) volatile {
+
+    USART_TypeDef* usart = getUARTPair(m_UARTPair).USARTReg;
+
+    while(!(usart->ISR & USART_ISR_TXE)); //Wait for usart to finish what it's doing
+
+    usart->TDR = c; //Send character
+}
+
+
+
+SHAL_UART& UARTManager::get(uint8_t uart) {
+
+    if(uart > NUM_USART_LINES - 1){
+        assert(false);
+        //Memory fault
+    }
+
+    return m_UARTs[uart];
+}