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8455e108bc
# Conflicts: # examples/ArmTimerCallbacks/RTE/Device/STM32F401RETx/startup_stm32f401xe.s # examples/ArmTimerCallbacks/RTE/Device/STM32F401RETx/system_stm32f4xx.c # examples/FunctionInterruptSimulation/FunctionInterruptSimulation.cpp # examples/FunctionInterruptSimulation/vs2017/FunctionInterruptSimulation.sln # examples/FunctionInterruptSimulation/vs2017/FunctionInterruptSimulation.vcxproj # examples/FunctionInterruptSimulation/vs2017/FunctionInterruptSimulation.vcxproj.filters # test/codeblocks/ETL.cbp # test/codeblocks/ETL.depend # test/codeblocks/ETL.layout # test/test_cyclic_value.cpp # test/vs2017/etl.vcxproj # test/vs2017/etl.vcxproj.filters
99 lines
3.8 KiB
C
99 lines
3.8 KiB
C
/*----------------------------------------------------------------------------
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* Name: Serial.c
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* Purpose: Low Level Serial Routines
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* Note(s): possible defines select the used communication interface:
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* __DBG_ITM - ITM SWO interface
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* - USART2 interface (default)
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*----------------------------------------------------------------------------
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* This file is part of the uVision/ARM development tools.
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* This software may only be used under the terms of a valid, current,
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* end user licence from KEIL for a compatible version of KEIL software
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* development tools. Nothing else gives you the right to use this software.
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*
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* This software is supplied "AS IS" without warranties of any kind.
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*
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* Copyright (c) 2014 Keil - An ARM Company. All rights reserved.
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*----------------------------------------------------------------------------*/
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#include "stm32f4xx.h" // Device header
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#include "Serial.h"
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#ifdef __DBG_ITM
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volatile int ITM_RxBuffer; /* CMSIS Debug Input */
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#endif
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/*----------------------------------------------------------------------------
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Define USART
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*----------------------------------------------------------------------------*/
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#define USARTx USART2
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/*----------------------------------------------------------------------------
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Define Baudrate setting (BRR) for USART
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*----------------------------------------------------------------------------*/
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#define __DIV(__PCLK, __BAUD) ((__PCLK*25)/(4*__BAUD))
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#define __DIVMANT(__PCLK, __BAUD) (__DIV(__PCLK, __BAUD)/100)
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#define __DIVFRAQ(__PCLK, __BAUD) (((__DIV(__PCLK, __BAUD) - (__DIVMANT(__PCLK, __BAUD) * 100)) * 16 + 50) / 100)
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#define __USART_BRR(__PCLK, __BAUD) ((__DIVMANT(__PCLK, __BAUD) << 4)|(__DIVFRAQ(__PCLK, __BAUD) & 0x0F))
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/*----------------------------------------------------------------------------
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Initialize UART pins, Baudrate
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*----------------------------------------------------------------------------*/
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void SER_Initialize (void) {
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#ifdef __DBG_ITM
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ITM_RxBuffer = ITM_RXBUFFER_EMPTY; /* CMSIS Debug Input */
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#else
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RCC->AHB1ENR |= ( 1ul << 0); /* Enable GPIOA clock */
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RCC->APB1ENR |= ( 1ul << 17); /* Enable USART#2 clock */
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/* Configure PA3 to USART2_RX, PA2 to USART2_TX */
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GPIOA->AFR[0] &= ~((15ul << 4* 3) | (15ul << 4* 2) );
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GPIOA->AFR[0] |= (( 7ul << 4* 3) | ( 7ul << 4* 2) );
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GPIOA->MODER &= ~(( 3ul << 2* 3) | ( 3ul << 2* 2) );
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GPIOA->MODER |= (( 2ul << 2* 3) | ( 2ul << 2* 2) );
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USARTx->BRR = __USART_BRR(12000000ul, 115200ul); /* 115200 baud @ 12MHz */
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USARTx->CR3 = 0x0000; /* no flow control */
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USARTx->CR2 = 0x0000; /* 1 stop bit */
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USARTx->CR1 = (( 1ul << 2) | /* enable RX */
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( 1ul << 3) | /* enable TX */
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( 0ul << 12) | /* 1 start bit, 8 data bits */
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( 1ul << 13) ); /* enable USART */
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#endif
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}
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/*----------------------------------------------------------------------------
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Write character to Serial Port
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*----------------------------------------------------------------------------*/
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int SER_PutChar (int ch) {
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#ifdef __DBG_ITM
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ITM_SendChar (ch & 0xFF);
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#else
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while (!(USARTx->SR & 0x0080));
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USARTx->DR = (ch & 0xFF);
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#endif
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return (ch);
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}
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/*----------------------------------------------------------------------------
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Read character from Serial Port
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*----------------------------------------------------------------------------*/
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int SER_GetChar (void) {
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#ifdef __DBG_ITM
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if (ITM_CheckChar())
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return ITM_ReceiveChar();
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#else
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if (USARTx->SR & 0x0020)
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return (USARTx->DR);
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#endif
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return (-1);
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}
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