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rt-thread-official/bsp/efm32/drv_usart.c

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/******************************************************************//**
* @file drv_usart.c
* @brief USART driver of RT-Thread RTOS for EFM32
* COPYRIGHT (C) 2011, RT-Thread Development Team
* @author onelife
* @version 0.4 beta
**********************************************************************
* @section License
* The license and distribution terms for this file may be found in the file LICENSE in this
* distribution or at http://www.rt-thread.org/license/LICENSE
**********************************************************************
* @section Change Logs
* Date Author Notes
* 2010-12-22 onelife Initial creation for EFM32
* 2011-01-17 onelife Merge with serial.c
*
* @section Change Logs of serial.c
* 2009-02-05 Bernard first version
* 2009-10-25 Bernard fix rt_serial_read bug when there is no data in the buffer.
* 2010-03-29 Bernard cleanup code.
*********************************************************************/
/******************************************************************//**
* @addtogroup efm32
* @{
*********************************************************************/
/* Includes -------------------------------------------------------------------*/
#include "board.h"
#include "hdl_interrupt.h"
#include "drv_usart.h"
/* Private typedef -------------------------------------------------------------*/
/* Private define --------------------------------------------------------------*/
/* Private macro --------------------------------------------------------------*/
/* Private variables ------------------------------------------------------------*/
#ifdef RT_USING_USART0
#if (RT_USING_USART0 > 3)
#error "The location number range of usart is 0~3"
#endif
struct rt_device usart0_device;
#endif
#ifdef RT_USING_USART1
#if (RT_USING_USART1 > 3)
#error "The location number range of usart is 0~3"
#endif
struct rt_device usart1_device;
#endif
#ifdef RT_USING_USART2
#if (RT_USING_USART2 > 3)
#error "The location number range of usart is 0~3"
#endif
struct rt_device usart2_device;
#endif
/* Private function prototypes ---------------------------------------------------*/
/* Private functions ------------------------------------------------------------*/
/******************************************************************//**
* @brief
* Initialize USART device
*
* @details
*
* @note
*
* @param[in] dev
* Pointer to device descriptor
*
* @return
* Error code
*********************************************************************/
static rt_err_t rt_usart_init (rt_device_t dev)
{
struct efm32_usart_device_t *usart;
usart = (struct efm32_usart_device_t *)(dev->user_data);
if (!(dev->flag & RT_DEVICE_FLAG_ACTIVATED))
{
if (dev->flag & RT_DEVICE_FLAG_DMA_TX)
{
struct efm32_usart_dma_mode_t *dma_tx;
dma_tx = (struct efm32_usart_dma_mode_t *)(usart->tx_mode);
usart->state |= USART_STATE_RX_BUSY;
}
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
{
struct efm32_usart_int_mode_t *int_rx;
int_rx = (struct efm32_usart_int_mode_t *)(usart->rx_mode);
int_rx->data_ptr = RT_NULL;
}
/* Enable USART */
USART_Enable(usart->usart_device, usartEnable);
dev->flag |= RT_DEVICE_FLAG_ACTIVATED;
}
return RT_EOK;
}
/******************************************************************//**
* @brief
* Open USART device
*
* @details
*
* @note
*
* @param[in] dev
* Pointer to device descriptor
*
* @param[in] oflag
* Device open flag
*
* @return
* Error code
*********************************************************************/
static rt_err_t rt_usart_open(rt_device_t dev, rt_uint16_t oflag)
{
RT_ASSERT(dev != RT_NULL);
struct efm32_usart_device_t *usart;
IRQn_Type rxIrq;
usart = (struct efm32_usart_device_t *)(dev->user_data);
//if (usart->state & USART_STATE_CONSOLE)
{ /* Allocate new RX buffer */
struct efm32_usart_int_mode_t *int_mode;
int_mode = (struct efm32_usart_int_mode_t *)(usart->rx_mode);
if ((int_mode->data_ptr = rt_malloc(SERIAL_RX_BUFFER_SIZE)) == RT_NULL)
{
rt_kprintf("no memory for serial RX buffer\n");
return -RT_ENOMEM;
}
rt_memset(int_mode->data_ptr, 0, SERIAL_RX_BUFFER_SIZE);
int_mode->data_size = SERIAL_RX_BUFFER_SIZE;
int_mode->read_index = 0;
int_mode->save_index = 0;
}
/* Enable TX/RX interrupt */
switch (usart->unit)
{
case 0:
rxIrq = USART0_RX_IRQn;
break;
case 1:
rxIrq = USART1_RX_IRQn;
break;
case 2:
rxIrq = USART2_RX_IRQn;
break;
}
/* Enable RX interrupts */
usart->usart_device->IEN = USART_IEN_RXDATAV;
usart->usart_device->IFC = _USART_IFC_MASK;
/* Enable IRQ */
if (oflag != RT_DEVICE_OFLAG_WRONLY)
{
NVIC_ClearPendingIRQ(rxIrq);
NVIC_SetPriority(rxIrq, EFM32_IRQ_PRI_DEFAULT);
NVIC_EnableIRQ(rxIrq);
}
if (oflag != RT_DEVICE_OFLAG_RDONLY)
{
/* DMA IRQ is enabled by DMA_Init() */
NVIC_SetPriority(DMA_IRQn, EFM32_IRQ_PRI_DEFAULT);
}
#ifdef RT_USART_DEBUG
rt_kprintf("USART%d: Open with flag %x\n", usart->unit, oflag);
#endif
return RT_EOK;
}
/******************************************************************//**
* @brief
* Close USART device
*
* @details
*
* @note
*
* @param[in] dev
* Pointer to device descriptor
*
* @return
* Error code
*********************************************************************/
static rt_err_t rt_usart_close(rt_device_t dev)
{
struct efm32_usart_int_mode_t *int_rx;
int_rx = (struct efm32_usart_int_mode_t *)\
(((struct efm32_usart_device_t *)(dev->user_data))->rx_mode);
rt_free(int_rx->data_ptr);
int_rx->data_ptr = RT_NULL;
return RT_EOK;
}
/******************************************************************//**
* @brief
* Read from USART device
*
* @details
*
* @note
*
* @param[in] dev
* Pointer to device descriptor
*
* @param[in] pos
* Offset
*
* @param[in] buffer
* Poniter to the buffer
*
* @param[in] size
* Buffer size in byte
*
* @return
* Error code
*********************************************************************/
static rt_size_t rt_usart_read (
rt_device_t dev,
rt_off_t pos,
void* buffer,
rt_size_t size)
{
rt_uint8_t* ptr;
rt_err_t err_code;
ptr = buffer;
err_code = RT_EOK;
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
{
/* interrupt mode Rx */
while (size)
{
rt_base_t level;
struct efm32_usart_int_mode_t *int_rx;
int_rx = (struct efm32_usart_int_mode_t *)\
(((struct efm32_usart_device_t *)(dev->user_data))->rx_mode);
/* disable interrupt */
level = rt_hw_interrupt_disable();
if (int_rx->read_index != int_rx->save_index)
{
/* read a character */
*ptr++ = int_rx->data_ptr[int_rx->read_index];
size--;
/* move to next position */
int_rx->read_index ++;
if (int_rx->read_index >= SERIAL_RX_BUFFER_SIZE)
{
int_rx->read_index = 0;
}
}
else
{
/* set error code */
err_code = -RT_EEMPTY;
/* enable interrupt */
rt_hw_interrupt_enable(level);
break;
}
/* enable interrupt */
rt_hw_interrupt_enable(level);
}
}
else
{
/* polling mode */
USART_TypeDef *usart_device;
RT_ASSERT(buffer != RT_NULL);
usart_device = ((struct efm32_usart_device_t *)(dev->user_data))->usart_device;
while ((rt_uint32_t)ptr - (rt_uint32_t)buffer < size)
{
while (usart_device->STATUS & USART_STATUS_RXDATAV)
{
*ptr = usart_device->RXDATA & 0xff;
ptr ++;
}
}
}
/* set error code */
rt_set_errno(err_code);
return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
}
/******************************************************************//**
* @brief
* Write to USART device
*
* @details
*
* @note
*
* @param[in] dev
* Pointer to device descriptor
*
* @param[in] pos
* Offset
*
* @param[in] buffer
* Poniter to the buffer
*
* @param[in] size
* Buffer size in byte
*
* @return
* Error code
*********************************************************************/
static rt_size_t rt_usart_write (
rt_device_t dev,
rt_off_t pos,
const void* buffer,
rt_size_t size)
{
rt_err_t err_code;
rt_size_t write_size;
struct efm32_usart_device_t* usart;
err_code = RT_EOK;
write_size = 0;
usart = (struct efm32_usart_device_t*)(dev->user_data);
if (dev->flag & RT_DEVICE_FLAG_DMA_TX)
{ /* DMA mode Tx */
struct efm32_usart_dma_mode_t *dma_tx;
if (dev->flag & RT_DEVICE_FLAG_STREAM)
{
*((rt_uint8_t *)buffer + size++) = '\r';
*((rt_uint8_t *)buffer + size) = 0x0;
}
dma_tx = (struct efm32_usart_dma_mode_t *)(usart->tx_mode);
dma_tx->data_ptr = (rt_uint32_t *)buffer;
dma_tx->data_size = size;
usart->state |= USART_STATE_TX_BUSY;
DMA_ActivateBasic(
dma_tx->dma_channel,
true,
false,
(void *)&(usart->usart_device->TXDATA),
buffer,
size - 1);
/* Wait, otherwise the TX buffer is overwrite */
if (usart->state & USART_STATE_CONSOLE)
{
while(usart->state & USART_STATE_TX_BUSY);
}
else
{
while(usart->state & USART_STATE_TX_BUSY)
{
rt_thread_sleep(USART_WAIT_TIME_TX);
}
}
write_size = size;
}
else
{ /* polling mode */
rt_uint8_t* ptr = (rt_uint8_t*)buffer;
if (dev->flag & RT_DEVICE_FLAG_STREAM)
{
/* stream mode */
while (size)
{
if (*ptr == '\n')
{
while (!(usart->usart_device->STATUS & USART_STATUS_TXBL));
usart->usart_device->TXDATA = '\r';
}
while (!(usart->usart_device->STATUS & USART_STATUS_TXBL));
usart->usart_device->TXDATA = (rt_uint32_t)*ptr;
++ptr; --size;
}
}
else
{
/* write data directly */
while (size)
{
while (!(usart->usart_device->STATUS & USART_STATUS_TXBL));
usart->usart_device->TXDATA = (rt_uint32_t)*ptr;
++ptr; --size;
}
}
write_size = (rt_size_t)ptr - (rt_size_t)buffer;
}
/* set error code */
rt_set_errno(err_code);
return write_size;
}
/******************************************************************//**
* @brief
* Configure USART device
*
* @details
*
* @note
*
* @param[in] dev
* Pointer to device descriptor
*
* @param[in] cmd
* IIC control command
*
* @param[in] args
* Arguments
*
* @return
* Error code
*********************************************************************/
static rt_err_t rt_usart_control (
rt_device_t dev,
rt_uint8_t cmd,
void *args)
{
RT_ASSERT(dev != RT_NULL);
struct efm32_usart_device_t *usart;
usart = (struct efm32_usart_device_t *)(dev->user_data);
switch (cmd)
{
case RT_DEVICE_CTRL_SUSPEND:
/* Suspend device */
dev->flag |= RT_DEVICE_FLAG_SUSPENDED;
USART_Enable(usart->usart_device, usartDisable);
break;
case RT_DEVICE_CTRL_RESUME:
/* Resume device */
dev->flag &= ~RT_DEVICE_FLAG_SUSPENDED;
USART_Enable(usart->usart_device, usartEnable);
break;
case RT_DEVICE_CTRL_USART_RBUFFER:
/* Set RX buffer */
{
struct efm32_usart_int_mode_t *int_rx;
rt_uint8_t size;
int_rx = (struct efm32_usart_int_mode_t *)(usart->rx_mode);
size = (rt_uint8_t)((rt_uint32_t)args & 0xFFUL);
/* Free previous RX buffer */
if (int_rx->data_ptr != RT_NULL)
{
if (size == 0)
{ /* Free RX buffer */
rt_free(int_rx->data_ptr);
int_rx->data_ptr = RT_NULL;
}
else if (size != int_rx->data_size)
{
/* Re-allocate RX buffer */
if ((int_rx->data_ptr = rt_realloc(int_rx->data_ptr, size)) \
== RT_NULL)
{
rt_kprintf("no memory for usart rx buffer\n");
return -RT_ENOMEM;
}
//rt_memset(int_rx->data_ptr, 0, size); //TODO
}
}
else
{
/* Allocate new RX buffer */
if ((int_rx->data_ptr = rt_malloc(size)) == RT_NULL)
{
rt_kprintf("no memory for usart rx buffer\n");
return -RT_ENOMEM;
}
}
int_rx->data_size = size;
int_rx->read_index = 0;
int_rx->save_index = 0;
}
break;
}
return RT_EOK;
}
/******************************************************************//**
* @brief
* USART RX data valid interrupt handler
*
* @details
*
* @note
*
* @param[in] dev
* Pointer to device descriptor
*********************************************************************/
void rt_hw_usart_rx_isr(rt_device_t dev)
{
struct efm32_usart_device_t *usart;
struct efm32_usart_int_mode_t *int_rx;
/* interrupt mode receive */
RT_ASSERT(dev->flag & RT_DEVICE_FLAG_INT_RX);
usart = (struct efm32_usart_device_t *)(dev->user_data);
int_rx = (struct efm32_usart_int_mode_t *)(usart->rx_mode);
RT_ASSERT(int_rx->data_ptr != RT_NULL);
/* Set status */
usart->state |= USART_STATE_RX_BUSY;
/* save on rx buffer */
while (usart->usart_device->STATUS & USART_STATUS_RXDATAV)
{
rt_base_t level;
/* disable interrupt */
level = rt_hw_interrupt_disable();
/* save character */
int_rx->data_ptr[int_rx->save_index] = \
(rt_uint8_t)(usart->usart_device->RXDATA & 0xFFUL);
int_rx->save_index ++;
if (int_rx->save_index >= SERIAL_RX_BUFFER_SIZE)
int_rx->save_index = 0;
/* if the next position is read index, discard this 'read char' */
if (int_rx->save_index == int_rx->read_index)
{
int_rx->read_index ++;
if (int_rx->read_index >= SERIAL_RX_BUFFER_SIZE)
{
int_rx->read_index = 0;
}
}
/* enable interrupt */
rt_hw_interrupt_enable(level);
}
/* invoke callback */
if (dev->rx_indicate != RT_NULL)
{
rt_size_t rx_length;
/* get rx length */
rx_length = int_rx->read_index > int_rx->save_index ?
SERIAL_RX_BUFFER_SIZE - int_rx->read_index + int_rx->save_index : \
int_rx->save_index - int_rx->read_index;
dev->rx_indicate(dev, rx_length);
}
}
/******************************************************************//**
* @brief
* DMA for USART TX interrupt handler
*
* @details
*
* @note
*
* @param[in] dev
* Pointer to device descriptor
*********************************************************************/
void rt_hw_usart_dma_tx_isr(rt_device_t dev)
{
/* DMA mode receive */
struct efm32_usart_device_t *usart;
struct efm32_usart_dma_mode_t *dma_tx;
RT_ASSERT(dev->flag & RT_DEVICE_FLAG_DMA_TX);
usart = (struct efm32_usart_device_t *)(dev->user_data);
dma_tx = (struct efm32_usart_dma_mode_t *)(usart->tx_mode);
/* invoke call to notify tx complete */
if (dev->tx_complete != RT_NULL)
{
dev->tx_complete(dev, dma_tx->data_ptr);
}
/* Set status */
usart->state &= ~(rt_uint32_t)USART_STATE_TX_BUSY;
}
/******************************************************************//**
* @brief
* Register USART device
*
* @details
*
* @note
*
* @param[in] device
* Pointer to device descriptor
*
* @param[in] name
* Device name
*
* @param[in] flag
* Configuration flags
*
* @param[in] usart
* Pointer to USART device descriptor
*
* @return
* Error code
*********************************************************************/
rt_err_t rt_hw_usart_register(
rt_device_t device,
const char *name,
rt_uint32_t flag,
struct efm32_usart_device_t *usart)
{
RT_ASSERT(device != RT_NULL);
if ((flag & RT_DEVICE_FLAG_DMA_RX) ||
(flag & RT_DEVICE_FLAG_INT_TX))
{
RT_ASSERT(0);
}
device->type = RT_Device_Class_Char;
device->rx_indicate = RT_NULL;
device->tx_complete = RT_NULL;
device->init = rt_usart_init;
device->open = rt_usart_open;
device->close = rt_usart_close;
device->read = rt_usart_read;
device->write = rt_usart_write;
device->control = rt_usart_control;
device->user_data = usart;
/* register a character device */
return rt_device_register(device, name, RT_DEVICE_FLAG_RDWR | flag);
}
/******************************************************************//**
* @brief
* Initialize the specified USART unit
*
* @details
*
* @note
*
* @param[in] device
* Pointer to device descriptor
*
* @param[in] unitNumber
* Unit number
*
* @param[in] location
* Pin location number
*
* @param[in] flag
* Configuration flag
*
* @param[in] dmaChannel
* DMA channel number for TX
*
* @param[in] console
* Indicate if using as console
*
* @return
* Pointer to USART device
*********************************************************************/
static struct efm32_usart_device_t *rt_hw_usart_unit_init(
rt_device_t device,
rt_uint8_t unitNumber,
rt_uint8_t location,
rt_uint32_t flag,
rt_uint32_t dmaChannel,
rt_bool_t console)
{
struct efm32_usart_device_t *usart;
struct efm32_usart_dma_mode_t *dma_mode;
CMU_Clock_TypeDef usartClock;
rt_uint32_t txDmaSelect;
USART_InitAsync_TypeDef init;
efm32_irq_hook_init_t hook;
/* Allocate device */
usart = rt_malloc(sizeof(struct efm32_usart_device_t));
if (usart == RT_NULL)
{
rt_kprintf("no memory for USART driver\n");
return usart;
}
usart->unit = unitNumber;
if (console == true)
{
usart->state = USART_STATE_CONSOLE;
}
else
{
usart->state = 0;
}
usart->tx_mode = RT_NULL;
usart->rx_mode = RT_NULL;
/* Allocate TX */
dma_mode = RT_NULL;
if (flag & RT_DEVICE_FLAG_DMA_TX)
{
usart->tx_mode = dma_mode = rt_malloc(sizeof(struct efm32_usart_dma_mode_t));
if (dma_mode == RT_NULL)
{
rt_kprintf("no memory for USART TX by DMA\n");
rt_free(usart->rx_mode);
rt_free(usart);
usart = RT_NULL;
return usart;
}
dma_mode->dma_channel = dmaChannel;
}
/* Allocate RX */
if (flag & RT_DEVICE_FLAG_INT_RX)
{
usart->rx_mode = rt_malloc(sizeof(struct efm32_usart_int_mode_t));
if (usart->rx_mode == RT_NULL)
{
rt_kprintf("no memory for USART RX by interrupt\n");
rt_free(usart->tx_mode);
rt_free(usart);
usart = RT_NULL;
return usart;
}
}
/* Initialization */
switch (unitNumber)
{
case 0:
usart->usart_device = USART0;
usartClock = (CMU_Clock_TypeDef)cmuClock_USART0;
txDmaSelect = DMAREQ_USART0_TXBL;
break;
case 1:
usart->usart_device = USART1;
usartClock = (CMU_Clock_TypeDef)cmuClock_USART1;
txDmaSelect = DMAREQ_USART1_TXBL;
break;
case 2:
usart->usart_device = USART2;
usartClock = (CMU_Clock_TypeDef)cmuClock_USART2;
txDmaSelect = DMAREQ_USART2_TXBL;
break;
}
/* Enable USART clock */
CMU_ClockEnable(usartClock, true);
/* Reset */
USART_Reset(usart->usart_device);
/* Config GPIO */
GPIO_PinModeSet(
(GPIO_Port_TypeDef)AF_PORT(AF_USART_TX(unitNumber), location),
AF_PIN(AF_USART_TX(unitNumber), location),
gpioModePushPull,
0);
GPIO_PinModeSet(
(GPIO_Port_TypeDef)AF_PORT(AF_USART_RX(unitNumber), location),
AF_PIN(AF_USART_RX(unitNumber), location),
gpioModeInputPull,
1);
/* Config interrupt and NVIC */
if (flag & RT_DEVICE_FLAG_INT_RX)
{
hook.type = efm32_irq_type_usart;
hook.unit = unitNumber * 2 + 1;
hook.cbFunc = rt_hw_usart_rx_isr;
hook.userPtr = device;
efm32_irq_hook_register(&hook);
}
/* Config DMA */
if (flag & RT_DEVICE_FLAG_DMA_TX)
{
DMA_CB_TypeDef *callback;
DMA_CfgChannel_TypeDef chnlCfg;
DMA_CfgDescr_TypeDef descrCfg;
hook.type = efm32_irq_type_dma;
hook.unit = dmaChannel;
hook.cbFunc = rt_hw_usart_dma_tx_isr;
hook.userPtr = device;
efm32_irq_hook_register(&hook);
callback = (DMA_CB_TypeDef *)rt_malloc(sizeof(DMA_CB_TypeDef));
callback->cbFunc = DMA_IRQHandler_All;
callback->userPtr = RT_NULL;
callback->primary = 0;
/* Setting up DMA channel */
chnlCfg.highPri = false; /* Can't use with peripherals */
chnlCfg.enableInt = true; /* Interrupt for callback function */
chnlCfg.select = txDmaSelect;
chnlCfg.cb = callback;
DMA_CfgChannel(dmaChannel, &chnlCfg);
/* Setting up DMA channel descriptor */
descrCfg.dstInc = dmaDataIncNone;
descrCfg.srcInc = dmaDataInc1;
descrCfg.size = dmaDataSize1;
descrCfg.arbRate = dmaArbitrate1;
descrCfg.hprot = 0;
DMA_CfgDescr(dmaChannel, true, &descrCfg);
}
/* Enable RX and TX pins and set location */
usart->usart_device->ROUTE = USART_ROUTE_RXPEN | USART_ROUTE_TXPEN | \
(location << _USART_ROUTE_LOCATION_SHIFT);
/* Init specified USART unit */
init.enable = usartEnable;
init.refFreq = 0;
init.baudrate = UART_BAUDRATE;
init.oversampling = USART_CTRL_OVS_X4;
init.databits = USART_FRAME_DATABITS_EIGHT;
init.parity = USART_FRAME_PARITY_NONE;
init.stopbits = USART_FRAME_STOPBITS_ONE;
USART_InitAsync(usart->usart_device, &init);
/* Clear RX/TX buffers */
usart->usart_device->CMD = USART_CMD_CLEARRX | USART_CMD_CLEARTX;
return usart;
}
/******************************************************************//**
* @brief
* Initialize all USART module related hardware and register USART device to kernel
*
* @details
*
* @note
*********************************************************************/
void rt_hw_usart_init(void)
{
struct efm32_usart_device_t *usart;
rt_uint32_t flag;
rt_bool_t console;
/* Register usart0 */
#ifdef RT_USING_USART0
flag = RT_DEVICE_FLAG_RDWR;
#if (RT_CONSOLE_DEVICE == 0x0UL)
console = true;
flag |= RT_DEVICE_FLAG_STREAM;
#else
console = false;
#endif
#ifdef RT_USART0_USING_DMA
RT_ASSERT(RT_USART0_USING_DMA < DMA_CHAN_COUNT);
flag |= RT_DEVICE_FLAG_DMA_TX;
#else
#define RT_USART0_USING_DMA EFM32_NO_DATA
#endif
flag |= RT_DEVICE_FLAG_INT_RX;
usart = rt_hw_usart_unit_init(
&usart0_device,
0,
RT_USING_USART0,
flag,
RT_USART0_USING_DMA,
console);
rt_hw_usart_register(&usart0_device, RT_USART0_NAME, flag, usart);
#endif
/* Register usart1 */
#ifdef RT_USING_USART1
flag = RT_DEVICE_FLAG_RDWR;
#if (RT_CONSOLE_DEVICE == 0x1UL)
console = true;
flag |= RT_DEVICE_FLAG_STREAM;
#else
console = false;
#endif
#ifdef RT_USART1_USING_DMA
RT_ASSERT(RT_USART1_USING_DMA < DMA_CHAN_COUNT);
flag |= RT_DEVICE_FLAG_DMA_TX;
#else
#define RT_USART1_USING_DMA EFM32_NO_DATA
#endif
flag |= RT_DEVICE_FLAG_INT_RX;
usart = rt_hw_usart_unit_init(
&usart1_device,
1,
RT_USING_USART1,
flag,
RT_USART1_USING_DMA,
console);
rt_hw_usart_register(&usart1_device, RT_USART1_NAME, flag, usart);
#endif
/* Register usart2 */
#ifdef RT_USING_USART2
flag = RT_DEVICE_FLAG_RDWR;
#if (RT_CONSOLE_DEVICE == 0x2UL)
console = true;
flag |= RT_DEVICE_FLAG_STREAM;
#else
console = false;
#endif
#ifdef RT_USART2_USING_DMA
RT_ASSERT(RT_USART2_USING_DMA < DMA_CHAN_COUNT);
flag |= RT_DEVICE_FLAG_DMA_TX;
#else
#define RT_USART2_USING_DMA EFM32_NO_DATA
#endif
flag |= RT_DEVICE_FLAG_INT_RX;
usart = rt_hw_usart_unit_init(
&usart2_device,
2,
RT_USING_USART2,
flag,
RT_USART2_USING_DMA,
console);
rt_hw_usart_register(&usart2_device, RT_USART2_NAME, flag, usart);
#endif
}
/******************************************************************//**
* @}
*********************************************************************/
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