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rt-thread/bsp/stm3210/usart.c

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#include "usart.h"
#include <serial.h>
/*
* Use UART1 as console output and finsh input
* interrupt Rx and poll Tx (stream mode)
*
* Use UART2 with DMA Rx and poll Tx -- DMA channel 6
* Use UART3 with DMA Tx and interrupt Rx -- DMA channel 2
*
* USART DMA setting on STM32
* USART1 Tx --> DMA Channel 4
* USART1 Rx --> DMA Channel 5
* USART2 Tx --> DMA Channel 7
* USART2 Rx --> DMA Channel 6
* USART3 Tx --> DMA Channel 2
* USART3 Rx --> DMA Channel 3
*/
#ifdef RT_USING_UART1
struct stm32_serial_int_rx uart1_int_rx;
struct stm32_serial_device uart1 =
{
USART1,
&uart1_int_rx,
RT_NULL,
RT_NULL,
RT_NULL
};
struct rt_device uart1_device;
#endif
#ifdef RT_USING_UART2
struct stm32_serial_int_rx uart2_int_rx;
struct stm32_serial_dma_rx uart2_dma_rx;
struct stm32_serial_device uart2 =
{
USART2,
&uart2_int_rx,
&uart2_dma_rx,
RT_NULL,
RT_NULL
};
struct rt_device uart2_device;
#endif
#ifdef RT_USING_UART3
struct stm32_serial_int_rx uart3_int_rx;
struct stm32_serial_dma_tx uart3_dma_tx;
struct stm32_serial_device uart3 =
{
USART3,
&uart3_int_rx,
RT_NULL,
RT_NULL,
&uart3_dma_tx
};
struct rt_device uart3_device;
#endif
#define USART1_DR_Base 0x40013804
#define USART2_DR_Base 0x40004404
#define USART3_DR_Base 0x40004804
/* USART1_REMAP = 0 */
#define UART1_GPIO_TX GPIO_Pin_9
#define UART1_GPIO_RX GPIO_Pin_10
#define UART1_GPIO GPIOA
#define RCC_APBPeriph_UART1 RCC_APB2Periph_USART1
#define UART1_TX_DMA DMA1_Channel4
#define UART1_RX_DMA DMA1_Channel5
/* USART2_REMAP = 0 */
#define UART2_GPIO_TX GPIO_Pin_2
#define UART2_GPIO_RX GPIO_Pin_3
#define UART2_GPIO GPIOA
#define RCC_APBPeriph_UART2 RCC_APB1Periph_USART2
#define UART2_TX_DMA DMA1_Channel7
#define UART2_RX_DMA DMA1_Channel6
/* USART3_REMAP[1:0] = 00 */
#define UART3_GPIO_RX GPIO_Pin_11
#define UART3_GPIO_TX GPIO_Pin_10
#define UART3_GPIO GPIOB
#define RCC_APBPeriph_UART3 RCC_APB1Periph_USART3
#define UART3_TX_DMA DMA1_Channel2
#define UART3_RX_DMA DMA1_Channel3
static void RCC_Configuration(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
#ifdef RT_USING_UART1
/* Enable USART1 and GPIOA clocks */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
#endif
#ifdef RT_USING_UART2
/* Enable GPIOD clocks */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE);
/* Enable USART2 clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
#endif
#ifdef RT_USING_UART3
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
/* Enable USART3 clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
#endif
#if defined (RT_USING_UART2) || defined (RT_USING_UART3)
/* DMA clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
#endif
}
static void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
#ifdef RT_USING_UART1
/* Configure USART1 Rx (PA.10) as input floating */
GPIO_InitStructure.GPIO_Pin = UART1_GPIO_RX;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(UART1_GPIO, &GPIO_InitStructure);
/* Configure USART1 Tx (PA.09) as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = UART1_GPIO_TX;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(UART1_GPIO, &GPIO_InitStructure);
#endif
#ifdef RT_USING_UART2
/* Configure USART2 Rx as input floating */
GPIO_InitStructure.GPIO_Pin = UART2_GPIO_RX;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(UART2_GPIO, &GPIO_InitStructure);
/* Configure USART2 Tx as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = UART2_GPIO_TX;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(UART2_GPIO, &GPIO_InitStructure);
#endif
#ifdef RT_USING_UART3
/* Configure USART3 Rx as input floating */
GPIO_InitStructure.GPIO_Pin = UART3_GPIO_RX;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(UART3_GPIO, &GPIO_InitStructure);
/* Configure USART3 Tx as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = UART3_GPIO_TX;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(UART3_GPIO, &GPIO_InitStructure);
#endif
}
static void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* Configure the NVIC Preemption Priority Bits */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
#ifdef RT_USING_UART1
/* Enable the USART1 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
#endif
#ifdef RT_USING_UART2
/* Enable the USART2 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Enable the DMA1 Channel6 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel6_IRQn;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
#endif
#ifdef RT_USING_UART3
/* Enable the USART3 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Enable the DMA1 Channel2 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
#endif
}
static void DMA_Configuration(void)
{
#if defined(RT_USING_UART2) || defined (RT_USING_UART3)
DMA_InitTypeDef DMA_InitStructure;
/* fill init structure */
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_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
#endif
#ifdef RT_USING_UART2
/* DMA1 Channel4 (triggered by USART2 Rx event) Config */
DMA_DeInit(UART2_RX_DMA);
DMA_InitStructure.DMA_PeripheralBaseAddr = USART2_DR_Base;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)0;
DMA_InitStructure.DMA_BufferSize = 0;
DMA_Init(UART2_RX_DMA, &DMA_InitStructure);
DMA_ITConfig(UART2_RX_DMA, DMA_IT_TC | DMA_IT_TE, ENABLE);
DMA_ClearFlag(DMA1_FLAG_TC4);
#endif
#ifdef RT_USING_UART3
/* DMA1 Channel5 (triggered by USART3 Tx event) Config */
DMA_DeInit(UART3_TX_DMA);
DMA_InitStructure.DMA_PeripheralBaseAddr = USART3_DR_Base;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)0;
DMA_InitStructure.DMA_BufferSize = 0;
DMA_Init(UART3_TX_DMA, &DMA_InitStructure);
DMA_ITConfig(UART3_TX_DMA, DMA_IT_TC | DMA_IT_TE, ENABLE);
DMA_ClearFlag(DMA1_FLAG_TC5);
#endif
}
/*
* Init all related hardware in here
* rt_hw_serial_init() will register all supported USART device
*/
void rt_hw_usart_init()
{
USART_InitTypeDef USART_InitStructure;
USART_ClockInitTypeDef USART_ClockInitStructure;
RCC_Configuration();
GPIO_Configuration();
NVIC_Configuration();
DMA_Configuration();
/* uart init */
#ifdef RT_USING_UART1
USART_InitStructure.USART_BaudRate = 115200;
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_ClockInitStructure.USART_Clock = USART_Clock_Disable;
USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
USART_Init(USART1, &USART_InitStructure);
USART_ClockInit(USART1, &USART_ClockInitStructure);
/* register uart1 */
rt_hw_serial_register(&uart1_device, "uart1",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
&uart1);
/* enable interrupt */
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
#endif
#ifdef RT_USING_UART2
USART_InitStructure.USART_BaudRate = 115200;
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_ClockInitStructure.USART_Clock = USART_Clock_Disable;
USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
USART_Init(USART2, &USART_InitStructure);
USART_ClockInit(USART2, &USART_ClockInitStructure);
uart2_dma_rx.dma_channel= UART2_RX_DMA;
/* register uart2 */
rt_hw_serial_register(&uart2_device, "uart2",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_DMA_RX,
&uart2);
/* Enable USART2 DMA Rx request */
USART_DMACmd(USART2, USART_DMAReq_Rx , ENABLE);
#endif
#ifdef RT_USING_UART3
USART_InitStructure.USART_BaudRate = 115200;
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_ClockInitStructure.USART_Clock = USART_Clock_Disable;
USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
USART_Init(USART3, &USART_InitStructure);
USART_ClockInit(USART3, &USART_ClockInitStructure);
uart3_dma_tx.dma_channel= UART3_TX_DMA;
/* register uart3 */
rt_hw_serial_register(&uart3_device, "uart3",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_DMA_TX,
&uart3);
/* Enable USART3 DMA Tx request */
USART_DMACmd(USART3, USART_DMAReq_Tx , ENABLE);
/* enable interrupt */
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
#endif
}
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