83 lines
3.0 KiB
C++
83 lines
3.0 KiB
C++
/**
|
|
******************************************************************************
|
|
* @file SHAL_TIM.h
|
|
* @author Luca Lizaranzu
|
|
* @brief Related to USART and UART abstractions
|
|
******************************************************************************
|
|
*/
|
|
|
|
|
|
#include "SHAL_UART.h"
|
|
#include "SHAL_GPIO.h"
|
|
|
|
UART::UART(const UART_Pair pair) : m_UARTPair(pair){
|
|
SHAL_UART_Pair uart_pair = getUARTPair(pair); //Get the UART_PAIR information to be initialized
|
|
|
|
//Get the GPIO pins for this UART setup
|
|
GPIO_Key Tx_Key = uart_pair.TxKey; //Tx pin
|
|
GPIO_Key Rx_Key = uart_pair.RxKey; //Rx pin
|
|
|
|
uint8_t Tx_Pin = getGPIORegister(Tx_Key).global_offset;
|
|
uint8_t Rx_Pin = getGPIORegister(Rx_Key).global_offset;
|
|
|
|
initGPIO(Tx_Key,PinMode::ALTERNATE_FUNCTION_MODE); //Initialize Tx GPIO with alternate function (initializes GPIO port as well)
|
|
initGPIO(Rx_Key,PinMode::ALTERNATE_FUNCTION_MODE); //Initialize Rx GPIO with alternate function
|
|
|
|
//Determine which AFR register (high or low) to write depending on pin
|
|
uint8_t TxAFR = Tx_Pin < 8 ? 0 : 1; //Use AFR[0] if pin < 8, AFR[1] if pin >= 8
|
|
uint8_t RxAFR = Rx_Pin < 8 ? 0 : 1;
|
|
|
|
/*Apply Alternate Function masks to the AFR registers for each GPIO to enable alternate functions
|
|
* The AFR register for GPIO_Typedef* is actually two registers - a low reg and high reg.
|
|
* The low reg handles pins 0-7, and the high reg handles 8-15.
|
|
* Each pin gets 4 bits in the register for AFR0 - AFR7. Hence 8 * 4 = 32 bits.
|
|
* Each AFR is a different function, look at the DATASHEET (not reference manual) to find these alternate function mappings
|
|
*/
|
|
getGPIORegister(Tx_Key).reg->AFR[TxAFR] |= getAFMask(uart_pair.TxMask) << (4 * (Tx_Pin % 8));
|
|
getGPIORegister(Rx_Key).reg->AFR[RxAFR] |= getAFMask(uart_pair.RxMask) << (4 * (Rx_Pin % 8));
|
|
|
|
SHAL_UART_ENABLE_REG pairUARTEnable = getUARTEnableReg(pair); //Register and mask to enable the UART channel
|
|
|
|
*pairUARTEnable.reg |= pairUARTEnable.mask; //Enable UART line
|
|
}
|
|
|
|
void 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 UART::sendString(const char *s) volatile {
|
|
while (*s) sendChar(*s++); //Send chars while we haven't reached end of s
|
|
}
|
|
|
|
void 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
|
|
}
|
|
|
|
|
|
|
|
UART& UARTManager::get(UART_Pair pair) {
|
|
|
|
//Reassign if pair doesn't match
|
|
if(m_UARTs[getUARTChannel(pair)].m_UARTPair != pair) {
|
|
m_UARTs[getUARTChannel(pair)] = UART(pair);
|
|
}
|
|
return m_UARTs[getUARTChannel(pair)];
|
|
}
|