Working

SHAL/Src/STM32L4xx/Peripheral/UART/SHAL_UART.cpp

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+/**
+  ******************************************************************************
+  * @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(UART_Pair_Key pair){
+
+    m_key = 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_Register 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_key).USARTReg;
+
+    auto control_reg = getUARTControlRegister1(m_key);
+
+    SHAL_clear_bitmask(control_reg.reg, control_reg.usart_enable_mask); //Clear enable bit (turn off usart)
+
+    usart->CR1 = 0; //Clear USART config
+
+    SHAL_apply_bitmask(control_reg.reg, control_reg.transmit_enable_mask); //Enable Tx
+    SHAL_apply_bitmask(control_reg.reg, control_reg.receive_enable_mask);  //Enable Rx
+
+    auto baud_rate_reg = getUARTBaudRateGenerationRegister(m_key);
+
+    uint32_t adjustedBaudRate = SystemCoreClock / baudRate;
+
+    SHAL_set_register_value(baud_rate_reg.reg,adjustedBaudRate);
+
+    SHAL_apply_bitmask(control_reg.reg, control_reg.usart_enable_mask); //Turn on usart
+}
+
+void SHAL_UART::sendString(const char *s) volatile {
+    while (*s) {//Send chars while we haven't reached end of s
+        sendChar(*s++);
+    }
+}
+
+void SHAL_UART::sendChar(char c) volatile {
+
+    auto ISR_non_fifo = getUARTISRFifoDisabled(m_key);
+
+    if(!SHAL_WAIT_FOR_CONDITION_MS((*ISR_non_fifo.reg & ISR_non_fifo.transmit_data_register_empty_mask) != 0, 500)){
+        PIN(B3).setHigh();
+        return;
+    }
+
+    auto transmit_reg = getUARTTransmitDataRegister(m_key);
+    SHAL_set_register_value_16(transmit_reg.reg, static_cast<uint16_t>(c));
+}
+
+
+
+SHAL_UART& UARTManager::get(uint8_t uart) {
+
+    if(uart > NUM_USART_LINES - 1){
+        assert(false);
+        //Memory fault
+    }
+
+    return m_UARTs[uart];
+}