[feat] add rs485(UART3) baseic driver
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787f8d20ad
commit
283685ff35
@ -1,6 +1,7 @@
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#include "stm32f4xx_rcc.h"
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#include "led.h"
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#include "lcd.h"
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// #include "lcd.h"
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#include "rs485.h"
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volatile uint32_t system_tick_cnt;
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@ -28,7 +29,8 @@ void system_init(void)
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{
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led_init();
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system_tick_init();
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lcd_init();
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// lcd_init();
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rs485_init();
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}
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int main(void)
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@ -39,7 +41,8 @@ int main(void)
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__enable_irq();
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while (1) {
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led_loop();
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lcd_loop();
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// lcd_loop();
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rs485_loop();
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}
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return 0;
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}
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@ -1,6 +1,7 @@
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file(GLOB FILELIST
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led.c
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lcd.c
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# lcd.c
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rs485.c
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)
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add_library(src STATIC ${FILELIST})
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153
stm32f4/src/rs485.c
Normal file
153
stm32f4/src/rs485.c
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@ -0,0 +1,153 @@
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#include "stm32f4xx_rcc.h"
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#include "stm32f4xx_gpio.h"
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#include "stm32f4xx_usart.h"
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#include "stm32f4xx_dma.h"
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#include "rs485.h"
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#define RS485_TX_STREAM DMA1_Stream3
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#define RS485_RX_STREAM DMA1_Stream1
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#define RS485_BUFF_TX_LEN (4096)
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#define RS485_BUFF_RX_LEN (1024)
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uint8_t rs485_buff_tx[RS485_BUFF_TX_LEN] __attribute__((aligned(16)));
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uint8_t rs485_buff_rx[RS485_BUFF_RX_LEN] __attribute__((aligned(16)));
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extern uint32_t system_tick_cnt;
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static void rs485_mode_tx(void)
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{
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GPIO_SetBits(RS485_PORT, RS485_PIN_DIR);
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}
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static void rs485_mode_rx(void)
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{
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GPIO_ResetBits(RS485_PORT, RS485_PIN_DIR);
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}
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void rs485_init(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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USART_InitTypeDef USART_InitStructure;
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DMA_InitTypeDef DMA_InitStructure;
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NVIC_InitTypeDef NVIC_InitStructure;
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RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
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RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
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GPIO_InitStructure.GPIO_Pin = RS485_PIN_DIR,
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT,
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP,
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz,
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL,
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GPIO_Init(RS485_PORT, &GPIO_InitStructure);
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rs485_mode_tx();
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GPIO_PinAFConfig(RS485_PORT, GPIO_PinSource10, GPIO_AF_USART3);
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GPIO_PinAFConfig(RS485_PORT, GPIO_PinSource11, GPIO_AF_USART3);
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GPIO_InitStructure.GPIO_Pin = RS485_PIN_TX | RS485_PIN_RX;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
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GPIO_Init(RS485_PORT, &GPIO_InitStructure);
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USART_DeInit(USART3);
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USART_OverSampling8Cmd(USART3, ENABLE);
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USART_InitStructure.USART_BaudRate = RS485_BAUDRATE;
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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USART_InitStructure.USART_Parity = USART_Parity_No;
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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USART_Init(USART3, &USART_InitStructure);
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USART_DMACmd(USART3, USART_DMAReq_Tx, ENABLE);
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USART_DMACmd(USART3, USART_DMAReq_Rx, ENABLE);
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USART_Cmd(USART3, ENABLE);
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DMA_InitStructure.DMA_BufferSize = RS485_BUFF_TX_LEN;
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DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
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DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull;
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DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
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DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
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DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
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DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
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DMA_InitStructure.DMA_PeripheralBaseAddr =(uint32_t)(&(USART3->DR));
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DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
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DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
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DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
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DMA_InitStructure.DMA_Priority = DMA_Priority_Low;
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DMA_InitStructure.DMA_Channel = DMA_Channel_4;
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DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
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DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)rs485_buff_tx;
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DMA_Init(RS485_TX_STREAM, &DMA_InitStructure);
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/* Configure DMA controller to manage USART RX request */
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DMA_InitStructure.DMA_BufferSize = RS485_BUFF_RX_LEN;
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DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
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DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)rs485_buff_rx;
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DMA_Init(RS485_RX_STREAM, &DMA_InitStructure);
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/* Configure interrupt for USART3 RX */
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NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 12;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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USART_ITConfig(USART3, USART_IT_IDLE, ENABLE);
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USART_ITConfig(USART3, USART_IT_TC, ENABLE);
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/* clear IT flag */
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USART_GetITStatus(USART3, USART_IT_IDLE);
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USART_ReceiveData(USART3);
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USART_ClearITPendingBit(USART3, USART_IT_IDLE);
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USART_ClearITPendingBit(USART3, USART_IT_TC);
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rs485_send(15);
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}
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void rs485_send(uint16_t len)
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{
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rs485_mode_tx();
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DMA_SetCurrDataCounter(RS485_TX_STREAM, len);
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DMA_Cmd(RS485_TX_STREAM, ENABLE);
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}
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void rs485_loop(void)
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{
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static uint32_t ms = 0;
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if (system_tick_cnt < (ms + 500)) {
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return;
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}
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ms = system_tick_cnt;
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// rs485_send(15);
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}
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void USART3_IRQHandler(void)
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{
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uint16_t len;
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if (USART_GetITStatus(USART3, USART_IT_TC) != RESET)
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{
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USART_ClearITPendingBit(USART3, USART_IT_TC);
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DMA_ClearFlag(RS485_TX_STREAM, DMA_FLAG_TCIF3 | DMA_FLAG_HTIF3 | DMA_FLAG_TEIF3 | DMA_FLAG_DMEIF3 | DMA_FLAG_FEIF3);
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DMA_Cmd(RS485_TX_STREAM, DISABLE);
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/* after tx complete, config rx */
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USART_ReceiveData(USART3);
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USART_ClearITPendingBit(USART3, USART_IT_IDLE);
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DMA_SetCurrDataCounter(RS485_RX_STREAM, RS485_BUFF_RX_LEN);
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DMA_Cmd(RS485_RX_STREAM, ENABLE);
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USART_ITConfig(USART3, USART_IT_IDLE, ENABLE);
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rs485_mode_rx();
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}
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if (USART_GetITStatus(USART3, USART_IT_IDLE) != RESET) {
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USART_ITConfig(USART3, USART_IT_IDLE, DISABLE);
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USART_ReceiveData(USART3);
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USART_ClearITPendingBit(USART3, USART_IT_IDLE);
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DMA_Cmd(RS485_RX_STREAM, DISABLE);
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DMA_ClearFlag(RS485_RX_STREAM, DMA_FLAG_TCIF1 | DMA_FLAG_HTIF1 | DMA_FLAG_TEIF1 | DMA_FLAG_DMEIF1 | DMA_FLAG_FEIF1);
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len = DMA_GetCurrDataCounter(RS485_RX_STREAM);
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len = RS485_BUFF_RX_LEN - len;
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for (uint16_t i = 0; i < len; i++) {
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rs485_buff_tx[i] = rs485_buff_rx[i] + 2;
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}
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rs485_send(len);
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}
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}
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26
stm32f4/src/rs485.h
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26
stm32f4/src/rs485.h
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@ -0,0 +1,26 @@
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#ifndef __RS485_H__
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#define __RS485_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "stm32f4xx.h"
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#define RS485_PORT (GPIOB)
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#define RS485_PIN_TX (GPIO_Pin_10)
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#define RS485_PIN_RX (GPIO_Pin_11)
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#define RS485_PIN_DIR (GPIO_Pin_1)
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#define RS485_BAUDRATE (115200)
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#define RS485_MB_ADDR (9)
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void rs485_init(void);
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void rs485_send(uint16_t len);
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void rs485_loop(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __RS485_H__ */
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