163 lines
4.7 KiB
C
163 lines
4.7 KiB
C
#include "uart.h"
|
||
#include "gpio.h"
|
||
//faire GPIO
|
||
|
||
void (* pFncUART) (uint8_t data); /* d<>claration d<>un pointeur de fonction */
|
||
|
||
void MyUART_Init_Periph (void (* ptrFonction)(uint8_t))
|
||
{
|
||
pFncUART = ptrFonction; /* affectation du pointeur */
|
||
}
|
||
|
||
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)
|
||
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)
|
||
{
|
||
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;
|
||
}
|
||
|
||
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
|
||
}
|
||
}
|
||
|
||
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
|
||
}
|
||
}
|
||
|
||
void USART3_IRQHandler(void)
|
||
{
|
||
// Check if receive data register not empty
|
||
if((USART3->SR & USART_SR_RXNE) == USART_SR_RXNE) //verify the flag
|
||
{
|
||
if (pFncUART != 0)
|
||
(*pFncUART) (USART3->DR); /* appel indirect de la fonction */
|
||
USART2->SR &= ~USART_SR_RXNE; //flag to 0
|
||
}
|
||
}
|
||
|
||
/* 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)
|
||
UART1.Wstop = stop1b; // nombre bit de stop (stop1b, stop2b)
|
||
MyUART_Init(&UART1); // initialisation
|
||
*/
|