The nRF24L01+ wireless dongle firmware
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gex-nrf-dongle/Src/usart.c

158 lines
5.7 KiB

/**
******************************************************************************
* File Name : USART.c
* Description : This file provides code for the configuration
* of the USART instances.
******************************************************************************
* This notice applies to any and all portions of this file
* that are not between comment pairs USER CODE BEGIN and
* USER CODE END. Other portions of this file, whether
* inserted by the user or by software development tools
* are owned by their respective copyright owners.
*
* Copyright (c) 2018 STMicroelectronics International N.V.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted, provided that the following conditions are met:
*
* 1. Redistribution of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of STMicroelectronics nor the names of other
* contributors to this software may be used to endorse or promote products
* derived from this software without specific written permission.
* 4. This software, including modifications and/or derivative works of this
* software, must execute solely and exclusively on microcontroller or
* microprocessor devices manufactured by or for STMicroelectronics.
* 5. Redistribution and use of this software other than as permitted under
* this license is void and will automatically terminate your rights under
* this license.
*
* THIS SOFTWARE IS PROVIDED BY STMICROELECTRONICS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS, IMPLIED OR STATUTORY WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE AND NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY
* RIGHTS ARE DISCLAIMED TO THE FULLEST EXTENT PERMITTED BY LAW. IN NO EVENT
* SHALL STMICROELECTRONICS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "usart.h"
7 years ago
#include <stdbool.h>
#include "gpio.h"
#include "dma.h"
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/* USART1 init function */
void MX_USART1_UART_Init(void)
{
LL_USART_InitTypeDef USART_InitStruct;
LL_GPIO_InitTypeDef GPIO_InitStruct;
/* Peripheral clock enable */
LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_USART1);
/**USART1 GPIO Configuration
PA9 ------> USART1_TX
PA10 ------> USART1_RX
*/
GPIO_InitStruct.Pin = LL_GPIO_PIN_9;
GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_HIGH;
GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
LL_GPIO_Init(GPIOA, &GPIO_InitStruct);
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// we don't use Rx
// GPIO_InitStruct.Pin = LL_GPIO_PIN_10;
// GPIO_InitStruct.Mode = LL_GPIO_MODE_FLOATING;
// LL_GPIO_Init(GPIOA, &GPIO_InitStruct);
/* USART1 DMA Init */
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/* USART1_TX Init */
LL_DMA_SetDataTransferDirection(DMA1, LL_DMA_CHANNEL_4, LL_DMA_DIRECTION_MEMORY_TO_PERIPH);
LL_DMA_SetChannelPriorityLevel(DMA1, LL_DMA_CHANNEL_4, LL_DMA_PRIORITY_LOW);
LL_DMA_SetMode(DMA1, LL_DMA_CHANNEL_4, LL_DMA_MODE_NORMAL);
LL_DMA_SetPeriphIncMode(DMA1, LL_DMA_CHANNEL_4, LL_DMA_PERIPH_NOINCREMENT);
LL_DMA_SetMemoryIncMode(DMA1, LL_DMA_CHANNEL_4, LL_DMA_MEMORY_INCREMENT);
LL_DMA_SetPeriphSize(DMA1, LL_DMA_CHANNEL_4, LL_DMA_PDATAALIGN_BYTE);
LL_DMA_SetMemorySize(DMA1, LL_DMA_CHANNEL_4, LL_DMA_MDATAALIGN_BYTE);
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// the USART address
LL_DMA_SetPeriphAddress(DMA1, LL_DMA_CHANNEL_4, LL_USART_DMA_GetRegAddr(USART1));
USART_InitStruct.BaudRate = 115200;
USART_InitStruct.DataWidth = LL_USART_DATAWIDTH_8B;
USART_InitStruct.StopBits = LL_USART_STOPBITS_1;
USART_InitStruct.Parity = LL_USART_PARITY_NONE;
USART_InitStruct.TransferDirection = LL_USART_DIRECTION_TX;
USART_InitStruct.HardwareFlowControl = LL_USART_HWCONTROL_NONE;
LL_USART_Init(USART1, &USART_InitStruct);
LL_USART_ConfigAsyncMode(USART1);
LL_USART_Enable(USART1);
}
7 years ago
/* USER CODE BEGIN 1 */
7 years ago
static volatile bool usart_dma_first = true;
/** Wait for the last DMA request to finish - so the buffer can be re-filled with new content */
void MX_USART_DmaWaitReady(void)
{
if (!usart_dma_first) {
// wait for the last transfer to finish
while (!LL_DMA_IsActiveFlag_TC4(DMA1));
}
LL_USART_DisableDMAReq_TX(USART1);
}
/** Send new content using DMA */
void MX_USART_DmaSend(uint8_t *buffer, uint32_t length)
{
usart_dma_first = false;
LL_USART_EnableDMAReq_TX(USART1);
LL_DMA_DisableChannel(DMA1, LL_DMA_CHANNEL_4);
LL_DMA_ClearFlag_TC4(DMA1);
LL_DMA_SetMemoryAddress(DMA1, LL_DMA_CHANNEL_4, (uint32_t) buffer);
LL_DMA_SetDataLength(DMA1, LL_DMA_CHANNEL_4, length);
LL_DMA_EnableChannel(DMA1, LL_DMA_CHANNEL_4);
}
/* USER CODE END 1 */
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/