83 lines
2.9 KiB
C++
83 lines
2.9 KiB
C++
/**
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******************************************************************************
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* @file SHAL_TIM.h
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* @author Luca Lizaranzu
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* @brief Related to USART and UART abstractions
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******************************************************************************
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*/
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#include "SHAL_UART.h"
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#include "SHAL_GPIO.h"
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UART::UART(const UART_Pair pair) : m_UARTPair(pair){
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SHAL_UART_Pair uart_pair = getUARTPair(pair); //Get the UART_PAIR information to be initialized
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//Get the GPIO pins for this UART setup
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GPIO_Key Tx_Key = uart_pair.TxKey; //Tx pin
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GPIO_Key Rx_Key = uart_pair.RxKey; //Rx pin
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uint8_t Tx_Pin = getGPIORegister(Tx_Key).global_offset;
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uint8_t Rx_Pin = getGPIORegister(Rx_Key).global_offset;
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initGPIO(Tx_Key,PinMode::ALTERNATE_FUNCTION_MODE); //Initialize Tx GPIO with alternate function (initializes GPIO port as well)
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initGPIO(Rx_Key,PinMode::ALTERNATE_FUNCTION_MODE); //Initialize Rx GPIO with alternate function
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//Determine which AFR register (high or low) to write depending on pin
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uint8_t TxAFR = Tx_Pin < 8 ? 0 : 1; //Use AFR[0] if pin < 8, AFR[1] if pin >= 8
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uint8_t RxAFR = Rx_Pin < 8 ? 0 : 1;
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/*Apply Alternate Function masks to the AFR registers for each GPIO to enable alternate functions
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* The AFR register for GPIO_Typedef* is actually two registers - a low reg and high reg.
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* The low reg handles pins 0-7, and the high reg handles 8-15.
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* Each pin gets 4 bits in the register for AFR0 - AFR7. Hence 8 * 4 = 32 bits.
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* Each AFR is a different function, look at the DATASHEET (not reference manual) to find these alternate functions
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*/
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getGPIORegister(Tx_Key).reg->AFR[TxAFR] |= getAFMask(uart_pair.TxMask) << (4 * (Tx_Pin % 8));
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getGPIORegister(Rx_Key).reg->AFR[RxAFR] |= getAFMask(uart_pair.RxMask) << (4 * (Rx_Pin % 8));
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SHAL_UART_ENABLE_REG pairUARTEnable = getUARTEnableReg(pair); //Register and mask to enable the UART channel
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*pairUARTEnable.reg |= pairUARTEnable.mask; //Enable UART line
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}
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void UART::begin(uint32_t baudRate) {
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USART_TypeDef* usart = getUARTPair(m_UARTPair).USARTReg;
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usart->CR1 &= ~USART_CR1_UE; //Disable USART
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usart->CR1 = 0; //Clear USART config
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usart->CR1 = USART_CR1_TE | USART_CR1_RE; //Tx enable and Rx Enable
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usart->BRR = 8000000 / baudRate; //MAKE SURE ANY FUNCTION THAT CHANGES CLOCK UPDATES THIS!
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usart->CR1 |= USART_CR1_UE;
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}
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void UART::sendString(const char *s) {
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while (*s) sendChar(*s++); //Send chars while we haven't reached end of s
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}
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void UART::sendChar(char c) {
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USART_TypeDef* usart = getUARTPair(m_UARTPair).USARTReg;
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while(!(usart->ISR & USART_ISR_TXE)); //Wait for usart to finish what it's doing
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usart->TDR = c; //Send character
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}
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UART& UARTManager::get(UART_Pair pair) {
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//Always reassign since we could be changing to different pins for some reason
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m_UARTs[getUARTChannel(pair)] = UART(pair);
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return m_UARTs[getUARTChannel(pair)];
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}
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