voilier-team-1/driver/uart.c

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4.7 KiB
C
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#include "uart.h"
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#include "gpio.h"
//faire GPIO
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void (* pFncUART) (uint8_t data); /* d<>claration d<>un pointeur de fonction */
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void MyUART_Init_Periph (void (* ptrFonction)(uint8_t))
{
pFncUART = ptrFonction; /* affectation du pointeur */
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}
int MyUART_setClockBit(MyUART_Struct_Typedef * UARTStructPtr)
{
if (UARTStructPtr->UART == USART1)
{
RCC->APB2ENR |= RCC_APB2ENR_USART1EN;
USART1->BRR = 72000000/(UARTStructPtr->BaudRate); //Calculating the baudrate depending on the clock frequency
return 0;
}
else if (UARTStructPtr->UART == USART2)
{
RCC->APB1ENR |= RCC_APB1ENR_USART2EN;
USART2->BRR = 36000000/(UARTStructPtr->BaudRate);
return 0;
}
else if (UARTStructPtr->UART == USART3)
{
RCC->APB1ENR |= RCC_APB1ENR_USART3EN;
USART3->BRR = 36000000/(UARTStructPtr->BaudRate);
return 0;
}
else {
return 1;
}
}
uint8_t MyUART_GetInterruptNum(USART_TypeDef * UART)
{
if(UART == USART1)
{
return USART1_IRQn;
}
else if(UART == USART2)
{
return USART2_IRQn;
}
else if(UART == USART3)
{
return USART3_IRQn;
}
else{
return 0;
}
}
void MyUART_ActiveIT(USART_TypeDef * UART, uint8_t Prio)
{
uint32_t IRQNumber = MyUART_GetInterruptNum(UART);
UART->CR1 |= (USART_CR1_RXNEIE); //Interruption active pour la reception UNIQUEMENT
NVIC->IP[IRQNumber] |= (Prio << 0x4); //Prio de l'interruption (p.197 manuel reference RM0008 pour ADC1_IRQn)
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NVIC->ISER[1] |= (0x1<<(IRQNumber-32)); //Active l'interruption au niveau NVIC (p.119 manuel programming pour ISER[1])
}
void MyUART_Init(MyUART_Struct_Typedef * UARTStructPtr){
MyUART_setClockBit(UARTStructPtr); //Clock enable and setting the baud.
UARTStructPtr->UART->CR1 = 0x00; // Clear ALL
UARTStructPtr->UART->CR1 |= USART_CR1_UE;
UARTStructPtr->UART->CR1 |= ((UARTStructPtr->length)<<12); //Setting the Length of the data transmitted
UARTStructPtr->UART->CR1 &= ~(0x3<<9); //reset CR1 9-10 bits, Parity Selection
if(UARTStructPtr->parity != parityNone) //if parity is enabled
{
UARTStructPtr->UART->CR1 |= (UARTStructPtr->parity<<9); //depending on the parity changing the 9th bit, and set 10th bit to 1
}
UARTStructPtr->UART->CR2 &= ~(0x3<<12); //reset CR2 13-12 bits, Stop bits
if(UARTStructPtr->stop != stopBit1) //if stop bits > 1
{
UARTStructPtr->UART->CR2 |= (UARTStructPtr->stop<<12); //depending on the stop changing the 12th and 13th bit.
}
//TxD Enable, RxD Enable, USART Global Enable
UARTStructPtr->UART->CR1 |= (USART_CR1_TE | USART_CR1_RE);
MyUART_ActiveIT(UARTStructPtr->UART,1);
}
void MyUART_InitGPIO(MyUART_Struct_Typedef * UARTStructPtr)
{
MyGPIO_Struct_TypeDef rxd,txd;
if(UARTStructPtr->UART == USART1)
{
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rxd = (MyGPIO_Struct_TypeDef){GPIOA,10,In_Floating};
txd = (MyGPIO_Struct_TypeDef){GPIOA,9,AltOut_Ppull};
}
else if(UARTStructPtr->UART == USART2) {
rxd = (MyGPIO_Struct_TypeDef){GPIOA,3,In_Floating};
txd = (MyGPIO_Struct_TypeDef){GPIOA,2,AltOut_Ppull};
}
else if(UARTStructPtr->UART == USART3) {
rxd = (MyGPIO_Struct_TypeDef){GPIOB,11,In_PullUp};
txd = (MyGPIO_Struct_TypeDef){GPIOB,10,AltOut_Ppull};
}
else {
return;
}
MyGPIO_Init(&rxd);
MyGPIO_Init(&txd);
}
void MyUART_Send(MyUART_Struct_Typedef *UART, uint8_t data)
{
UART->UART->DR = data;
//du DR au Registre de Transmission, on attend que le shift register ai récupéré le DR
while (!(UART->UART->SR & USART_SR_TXE));
}
uint8_t MyUART_Receive(MyUART_Struct_Typedef *UART)
{
while (!(UART->UART->SR & USART_SR_RXNE)); // Si RXNE est mis à 1, alors on vient de recevoir une donnée !
uint8_t data = UART->UART->DR; // Read the data.
UART->UART->SR &= ~USART_SR_RXNE; //flag to 0
return data;
}
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void USART1_IRQHandler(void)
{
if((USART1->SR & USART_SR_RXNE) == USART_SR_RXNE) //verify the flag
{
if (pFncUART != 0)
(*pFncUART) (USART1->DR); /* appel indirect de la fonction */
USART1->SR &= ~USART_SR_RXNE; //flag to 0
}
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}
void USART2_IRQHandler(void)
{
if((USART2->SR & USART_SR_RXNE) == USART_SR_RXNE) //verify the flag
{
if (pFncUART != 0)
(*pFncUART) (USART2->DR); /* appel indirect de la fonction */
USART2->SR &= ~USART_SR_RXNE; //flag to 0
}
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}
void USART3_IRQHandler(void)
{
// Check if receive data register not empty
if((USART3->SR & USART_SR_RXNE) == USART_SR_RXNE) //verify the flag
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{
if (pFncUART != 0)
(*pFncUART) (USART3->DR); /* appel indirect de la fonction */
USART2->SR &= ~USART_SR_RXNE; //flag to 0
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}
}
/* exemple utilisation fonction :
UART1.UART = USART1; // choix UART (USART1, USART2, USART3)
UART1.BaudRate = 9600; // Vitesse de communication MAX 118200
UART1.Wlengh = Wlengh8; // longeur du mot (Wlengh8 ,Wlengh9)
UART1.Wparity = parity_even; // parit<69> (parity_even, parity_odd, parity_none)
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UART1.Wstop = stop1b; // nombre bit de stop (stop1b, stop2b)
MyUART_Init(&UART1); // initialisation
*/