150 lines
4.1 KiB
C
150 lines
4.1 KiB
C
#include "uart.h"
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#include "gpio.h"
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//faire GPIO
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char data1 = 0;
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char data2 = 0;
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char data3 = 0;
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void MyUART_Init(MyUART_Struct_Typedef * UARTStructPtr){
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MyUART_setClockBit(UARTStructPtr); //Clock enable and setting the baud.
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UARTStructPtr->UART->CR1 = 0x00; // Clear ALL
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UARTStructPtr->UART->CR1 |= USART_CR1_UE;
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UARTStructPtr->UART->CR1 |= ((UARTStructPtr->length)<<12); //Setting the Length of the data transmitted
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UARTStructPtr->UART->CR1 &= ~(0x3<<9); //reset CR1 9-10 bits, Parity Selection
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if(UARTStructPtr->parity != parityNone) //if parity is enabled
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{
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UARTStructPtr->UART->CR1 |= (UARTStructPtr->parity<<9); //depending on the parity changing the 9th bit, and set 10th bit to 1
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}
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UARTStructPtr->UART->CR2 &= ~(0x3<<12); //reset CR2 13-12 bits, Stop bits
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if(UARTStructPtr->stop != stopBit1) //if stop bits > 1
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{
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UARTStructPtr->UART->CR2 |= (UARTStructPtr->stop<<12); //depending on the stop changing the 12th and 13th bit.
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}
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//TxD Enable, RxD Enable, USART Global Enable
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UARTStructPtr->UART->CR1 |= (USART_CR1_TE | USART_CR1_RE);
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MyUART_ActiveIT(UARTStructPtr->UART,1);
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}
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int MyUART_setClockBit(MyUART_Struct_Typedef * UARTStructPtr)
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{
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if (UARTStructPtr->UART == USART1)
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{
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RCC->APB2ENR |= RCC_APB2ENR_USART1EN;
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USART1->BRR = 72000000/(UARTStructPtr->BaudRate); //Calculating the baudrate depending on the clock frequency
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return 0;
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}
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else if (UARTStructPtr->UART == USART2)
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{
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RCC->APB1ENR |= RCC_APB1ENR_USART2EN;
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USART2->BRR = 36000000/(UARTStructPtr->BaudRate);
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return 0;
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}
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else if (UARTStructPtr->UART == USART3)
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{
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RCC->APB1ENR |= RCC_APB1ENR_USART3EN;
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USART3->BRR = 36000000/(UARTStructPtr->BaudRate);
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return 0;
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}
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else {
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return 1;
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}
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}
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void MyUART_ActiveIT(USART_TypeDef * UART, uint8_t Prio)
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{
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uint32_t IRQNumber = MyUART_GetInterruptNum(UART);
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UART->CR1 |= (USART_CR1_RXNEIE); //Interruption active pour la reception UNIQUEMENT
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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[0])
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}
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void MyUART_Send(MyUART_Struct_Typedef *UART, uint8_t data)
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{
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UART->UART->DR = data;
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//du DR au Registre de Transmission, on attend que le bit de stop soit envoyé
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while (!(UART->UART->SR & USART_SR_TC));
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}
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uint8_t MyUART_Receive(MyUART_Struct_Typedef *UART)
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{
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while (!(UART->UART->SR & USART_SR_RXNE)); // Si RXNE est mis à 1, alors on vient de recevoir une donnée !
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uint8_t data = UART->UART->DR; // Read the data.
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UART->UART->SR &= ~USART_SR_RXNE; //flag to 0
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return data;
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}
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uint8_t MyUART_GetInterruptNum(USART_TypeDef * UART)
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{
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if(UART == USART1)
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{
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return USART1_IRQn;
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}
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else if(UART == USART2)
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{
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return USART2_IRQn;
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}
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else if(UART == USART3)
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{
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return USART3_IRQn;
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}
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else{
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return 0;
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}
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}
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void USART1_IRQHandler(void)
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{
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if((USART1->SR & USART_SR_RXNE) == USART_SR_RXNE) //verify the flag
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{
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data1 = USART1->DR; // read received data
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USART1->SR &= ~USART_SR_RXNE; //flag to 0
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}
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}
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void USART2_IRQHandler(void)
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{
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if((USART2->SR & USART_SR_RXNE) == USART_SR_RXNE) //verify the flag
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{
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data2 = USART2->DR; // read received data
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USART2->SR &= ~USART_SR_RXNE; //flag to 0
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}
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}
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void USART3_IRQHandler(void)
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{
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// Check if receive data register not empty
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if((USART3->SR & USART_SR_RXNE) == USART_SR_RXNE) //verify the flag
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{
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data3 = USART3->DR; // read received data
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// do something with received data
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USART2->SR &= ~USART_SR_RXNE; //flag to 0
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}
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}
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char MyUART_Read(MyUART_Struct_Typedef * UARTStructPtr)
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{
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if(UARTStructPtr->UART == USART1)
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return data1;
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else if(UARTStructPtr->UART == USART2)
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return data2;
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else if(UARTStructPtr->UART == USART3)
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return data3;
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else
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return 0xFF;
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}
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/* exemple utilisation fonction :
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UART1.UART = USART1; // choix UART (USART1, USART2, USART3)
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UART1.BaudRate = 9600; // Vitesse de communication MAX 118200
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UART1.Wlengh = Wlengh8; // longeur du mot (Wlengh8 ,Wlengh9)
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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)
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MyUART_Init(&UART1); // initialisation
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*/
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