Author: Wind
OS: WIN7
IDE: KEILuvision V5.10.0.2
MCU: STM32 F303 VC T6
一、硬件設計
1.MCU使用USART2，USART2_TX——PA2,USART2_RX——PA3
2.DMA：查看ST官方網站的STM32F3參考手冊（官網下載），使用DMA1 Channel7
3.MCU與藍牙模塊連接：
二、程序代碼
1.USART配置：查看ST官方固件庫手冊(官網下載），按順序進行配置，以下復制原文：
//23.2 USART Firmware driver API description
The following section lists the various functions of the USART library.
23.2.1 How to use this driver
1. Enable peripheral clock using RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE) function for USART1 or using RCC_APB1PeriphClockCmd(RCC_APB1Periph_USARTx, ENABLE) function for USART2, USART3, UART4 and UART5.
2. According to the USART mode, enable the GPIO clocks using RCC_AHBPeriphClockCmd() function. (The I/O can be TX, RX, CTS, or and SCLK). 3. Peripheral's alternate function: Connect the pin to the desired peripherals' Alternate Function (AF) using GPIO_PinAFConfig() function.
Configure the desired pin in alternate function by: GPIO_InitStruct->GPIO_Mode=
GPIO_Mode_AF.
Select the type, pull-up/pull-down and output speed via GPIO_PuPd,
GPIO_OType and GPIO_Speed members.
Call GPIO_Init() function.
4. Program the Baud Rate, Word Length , Stop Bit, Parity, Hardware flow control and
Mode(Receiver/Transmitter) using the SPI_Init() function.
5. For synchronous mode, enable the clock and program the polarity, phase and last bit
using the USART_ClockInit() function.
6. Enable the NVIC and the corresponding interrupt using the function
USART_ITConfig() if you need to use interrupt mode.
7. When using the DMA mode:
Configure the DMA using DMA_Init() function.
Active the needed channel Request using USART_DMACmd() function.
8. Enable the USART using the USART_Cmd() function.
9. Enable the DMA using the DMA_Cmd() function, when using DMA mode.
2.DMA配置
//9.2 DMA Firmware driver API description
The following section lists the various functions of the DMA library.
9.2.1 How to use this driver
1. Enable The DMA controller clock using RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE) function for DMA1 or using RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE) function for DMA2.
2. Enable and configure the peripheral to be connected to the DMA channel (except for internal SRAM / FLASH memories: no initialization is necessary).
3. For a given Channel, program the Source and Destination addresses, the transfer Direction, the Buffer Size, the Peripheral and Memory Incrementation mode and Data Size, the Circular or Normal mode, the channel transfer Priority and the Memory- to- Memory transfer mode (if needed) using the DMA_Init() function.
4. Enable the NVIC and the corresponding interrupt(s) using the function DMA_ITConfig() if you need to use DMA interrupts.
5. Enable the DMA channel using the DMA_Cmd() function.
6. Activate the needed channel Request using PPP_DMACmd() function for any PPP peripheral except internal SRAM and FLASH (ie. SPI, USART ...) The function allowing this operation is provided in each PPP peripheral driver (ie. SPI_DMACmd for SPI peripheral).
7. Optionally, you can configure the number of data to be transferred when the channel is disabled (ie. after each Transfer Complete event or when a Transfer Error occurs) using the function DMA_SetCurrDataCounter(). And you can get the number of remaining data to be transferred using the function DMA_GetCurrDataCounter() at run time (when the DMA channel is enabled and running).
8. To control DMA events you can use one of the following two methods:
a. Check on DMA channel flags using the function DMA_GetFlagStatus().
b. Use DMA interrupts through the function DMA_ITConfig() at initialization phase and DMA_GetITStatus() function into interrupt routines in communication phase. After checking on a flag you should clear it using DMA_ClearFlag() function. And after checking on an interrupt event you should clear it using DMA_ClearITPendingBit() function.
3.開始發送，使能各功能模塊
源代碼：
- // Header:
- // File Name: main.h
- // Author: Wind
- // Date: 2015.01.25
-
- #ifndef MAIN_H
- #define MAIN_H
- #include "stm32f30x.h"
- #include "stm32f30x_rcc.h"
- #include "stm32f30x_dma.h"
- #include "Config.h"
- #endif
-
-
- // Header:
- // File Name: main.c
- // Author: Wind
- // Date: 2015.01.25
-
- #include "main.h"
- #define BT_TX_BUFFER_LENGTH 26 //發送26個字母
- static uint8_t BT_TX_Buffer[BT_TX_BUFFER_LENGTH];
-
- int main()
- {
- uint8_t i=0,data='A';
- BTUSARTConfig(115200);//波特率115200
- BTDMAConfig((uint32_t) BT_TX_Buffer,BT_TX_BUFFER_LENGTH);
- //準備好待發送數據
- for (i=0;i
- {
- BT_TX_Buffer[i] = data;
- }
- //開始發送
- StartDataTransfer();
- while(1); //連續發送，同時CPU可以做其他事情
-
- }
-
-
- // Header:
- // File Name: Config.h
- // Author: Wind
- // Date: 2015.01.25
-
- #ifndef CONFIG_H
- #define CONFIG_H
- #include "stm32f30x.h"
- #include "stm32f30x_rcc.h"
- #include "stm32f30x_dma.h"
- // Bluetooth port settings
- #define BT_USART_IO_PORT GPIOA
- #define BT_TX_PIN GPIO_Pin_2
- #define BT_RX_PIN GPIO_Pin_3
- #define BT_TX_SOURCE GPIO_PinSource2
- #define BT_RX_SOURCE GPIO_PinSource3
- #define BT_USART_GPIO_CLK RCC_AHBPeriph_GPIOA
- #define BT_USART_CLK RCC_APB1Periph_USART2
- #define BT_TX_AF GPIO_AF_USART2
- #define BT_RX_AF GPIO_AF_USART2
- #define GPIO_AF_USART2 GPIO_AF_7
- #define BT_USART_PORT USART2
- #define BT_USART_TDR_ADDRESS ((uint32_t)USART2 + 0x28)
- #define BT_USART_RDR_ADDRESS ((uint32_t)USART2 + 0x24)
- #define BT_USART_DMA_PORT DMA1
- #define BT_USART_DMA_CLK RCC_AHBPeriph_DMA1
- #define BT_USART_TX_DMA_CHANNEL DMA1_Channel7
- #define BT_USART_RX_DMA_CHANNEL DMA1_Channel6
- #define BT_USART_TX_DMA_FLAG_TCIF DMA1_FLAG_TC7
- #define BT_USART_RX_DMA_FLAG_TCIF DMA1_FLAG_TC6
- //Function declaration
- void BTUSARTConfig(uint32_t baudrate);
- void BTDMAConfig(uint32_t DataAddr,uint8_t dataLength);
- void StartDataTransfer(void);
- #endif
-
-
- // Header:
- // File Name: Config.c
- // Author: Wind
- // Date: 2015.01.25
-
- #include "Config.h"
-
- //USART配置
- void BTUSARTConfig(uint32_t baudrate)
- {
- USART_InitTypeDef USART_InitStructure;
- GPIO_InitTypeDef GPIO_InitStructure;
- RCC_AHBPeriphClockCmd(BT_USART_GPIO_CLK, ENABLE);
- RCC_APB1PeriphClockCmd(BT_USART_CLK, ENABLE);
- GPIO_InitStructure.GPIO_Pin = (BT_TX_PIN | BT_RX_PIN);
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //¸′óÃÄ￡ê½
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
- GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
- GPIO_Init(BT_USART_IO_PORT, &GPIO_InitStructure);
- GPIO_PinAFConfig(BT_USART_IO_PORT, BT_TX_SOURCE, BT_TX_AF);//ÅäÖÃòy½Åμĸ′óÃ1|Äü
- GPIO_PinAFConfig(BT_USART_IO_PORT, BT_RX_SOURCE, BT_RX_AF);
- USART_InitStructure.USART_BaudRate = baudrate;
- USART_InitStructure.USART_WordLength = USART_WordLength_8b;
- USART_InitStructure.USART_StopBits = USART_StopBits_1;
- USART_InitStructure.USART_Parity = USART_Parity_No;
- USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
- USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
- USART_DeInit(BT_USART_PORT);
- USART_Init(BT_USART_PORT, &USART_InitStructure);
- USART_Cmd(BT_USART_PORT, ENABLE);
- }
- //DMA配置
- //para:dataAddr:Transffer data address;dataLength:Transffer data length
- void BTDMAConfig(uint32_t dataAddr,uint8_t dataLength)
- {
- DMA_InitTypeDef DMA_InitStructure;
- RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);
- DMA_StructInit(&DMA_InitStructure);
- DMA_DeInit(BT_USART_TX_DMA_CHANNEL);
- DMA_InitStructure.DMA_PeripheralBaseAddr = BT_USART_TDR_ADDRESS;
- DMA_InitStructure.DMA_MemoryBaseAddr = dataAddr;
- DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; //外設作為發送目的地
- DMA_InitStructure.DMA_BufferSize = dataLength;
- DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
- DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
- DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
- DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
- DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //循環發送模式
- DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
- DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
- DMA_Init(BT_USART_TX_DMA_CHANNEL,&DMA_InitStructure);
- }
- //開始發送
- void StartDataTransfer(void)
- {
- //清除標志位，否則可能丟失數據
- USART_ClearFlag(BT_USART_PORT,USART_FLAG_TC);
- DMA_ClearFlag(BT_USART_TX_DMA_FLAG_TCIF);
- //發送
- USART_DMACmd(BT_USART_PORT,USART_DMAReq_Tx,ENABLE);
- DMA_Cmd(BT_USART_TX_DMA_CHANNEL,ENABLE);
- //等待發送完畢
- while (!DMA_GetFlagStatus(BT_USART_TX_DMA_FLAG_TCIF));
- }
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