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提交 59653699 编写于 作者: B Bernard Xiong
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Update uart.c

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Showing with 251 addition and 250 deletion
bsp/lpc176x/drivers/uart.c
浏览文件 @ 59653699
......@@ -37,7 +37,7 @@
#define LSR_RXFE 0x80
/**
* @addtogroup LPC11xx
* @addtogroup LPC176x
*/
/*@{*/
......@@ -54,12 +54,12 @@ struct rt_uart_lpc
/* buffer for reception */
rt_uint8_t read_index, save_index;
rt_uint8_t rx_buffer[RT_UART_RX_BUFFER_SIZE];
}uart_device;
} uart_device;
void UART0_IRQHandler(void)
{
rt_ubase_t level, iir;
struct rt_uart_lpc* uart = &uart_device;
struct rt_uart_lpc *uart = &uart_device;
/* read IIR and clear it */
iir = LPC_UART->IIR;
......@@ -79,7 +79,7 @@ void UART0_IRQHandler(void)
rt_hw_interrupt_enable(level);
/* invoke callback */
if(uart->parent.rx_indicate != RT_NULL)
if (uart->parent.rx_indicate != RT_NULL)
{
rt_size_t length;
if (uart->read_index > uart->save_index)
......@@ -89,15 +89,16 @@ void UART0_IRQHandler(void)
uart->parent.rx_indicate(&uart->parent, length);
}
}else if(iir == IIR_RLS)
}
else if (iir == IIR_RLS)
{
iir = LPC_Uart->LSR; //oe pe fe oe read for clear interrupt
iir = LPC_UART->LSR; //oe pe fe oe read for clear interrupt
}
return;
}
static rt_err_t rt_uart_init (rt_device_t dev)
static rt_err_t rt_uart_init(rt_device_t dev)
{
rt_uint32_t Fdiv;
rt_uint32_t pclkdiv, pclk;
......@@ -111,31 +112,31 @@ static rt_err_t rt_uart_init (rt_device_t dev)
all the peripherals is 1/4 of the SystemFrequency. */
/* Bit 6~7 is for UART0 */
pclkdiv = (LPC_SC->PCLKSEL0 >> 6) & 0x03;
switch ( pclkdiv )
switch (pclkdiv)
{
case 0x00:
default:
pclk = SystemCoreClock/4;
pclk = SystemCoreClock / 4;
break;
case 0x01:
pclk = SystemCoreClock;
break;
case 0x02:
pclk = SystemCoreClock/2;
pclk = SystemCoreClock / 2;
break;
case 0x03:
pclk = SystemCoreClock/8;
pclk = SystemCoreClock / 8;
break;
}
LPC_UART0->LCR = 0x83; /* 8 bits, no Parity, 1 Stop bit */
Fdiv = ( pclk / 16 ) / UART_BAUDRATE; /*baud rate */
Fdiv = (pclk / 16) / UART_BAUDRATE; /*baud rate */
LPC_UART0->DLM = Fdiv / 256;
LPC_UART0->DLL = Fdiv % 256;
LPC_UART0->LCR = 0x03; /* DLAB = 0 */
LPC_UART0->FCR = 0x07; /* Enable and reset TX and RX FIFO. */
}
else if ((LPC_UART1_TypeDef*)LPC_UART == LPC_UART1)
else if ((LPC_UART1_TypeDef *)LPC_UART == LPC_UART1)
{
LPC_PINCON->PINSEL4 &= ~0x0000000F;
LPC_PINCON->PINSEL4 |= 0x0000000A; /* Enable RxD1 P2.1, TxD1 P2.0 */
......@@ -144,25 +145,25 @@ static rt_err_t rt_uart_init (rt_device_t dev)
all the peripherals is 1/4 of the SystemFrequency. */
/* Bit 8,9 are for UART1 */
pclkdiv = (LPC_SC->PCLKSEL0 >> 8) & 0x03;
switch ( pclkdiv )
switch (pclkdiv)
{
case 0x00:
default:
pclk = SystemCoreClock/4;
pclk = SystemCoreClock / 4;
break;
case 0x01:
pclk = SystemCoreClock;
break;
case 0x02:
pclk = SystemCoreClock/2;
pclk = SystemCoreClock / 2;
break;
case 0x03:
pclk = SystemCoreClock/8;
pclk = SystemCoreClock / 8;
break;
}
LPC_UART1->LCR = 0x83; /* 8 bits, no Parity, 1 Stop bit */
Fdiv = ( pclk / 16 ) / UART_BAUDRATE ; /*baud rate */
Fdiv = (pclk / 16) / UART_BAUDRATE ; /*baud rate */
LPC_UART1->DLM = Fdiv / 256;
LPC_UART1->DLL = Fdiv % 256;
LPC_UART1->LCR = 0x03; /* DLAB = 0 */
......@@ -170,8 +171,8 @@ static rt_err_t rt_uart_init (rt_device_t dev)
}
/* Ensure a clean start, no data in either TX or RX FIFO. */
while (( LPC_UART->LSR & (LSR_THRE|LSR_TEMT)) != (LSR_THRE|LSR_TEMT) );
while ( LPC_UART->LSR & LSR_RDR )
while ((LPC_UART->LSR & (LSR_THRE | LSR_TEMT)) != (LSR_THRE | LSR_TEMT));
while (LPC_UART->LSR & LSR_RDR)
{
Fdiv = LPC_UART->RBR; /* Dump data from RX FIFO */
}
......@@ -204,14 +205,14 @@ static rt_err_t rt_uart_close(rt_device_t dev)
return RT_EOK;
}
static rt_size_t rt_uart_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
static rt_size_t rt_uart_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
{
rt_uint8_t* ptr;
struct rt_uart_lpc *uart = (struct rt_uart_lpc*)dev;
rt_uint8_t *ptr;
struct rt_uart_lpc *uart = (struct rt_uart_lpc *)dev;
RT_ASSERT(uart != RT_NULL);
/* point to buffer */
ptr = (rt_uint8_t*) buffer;
ptr = (rt_uint8_t *) buffer;
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
{
while (size)
......@@ -251,10 +252,10 @@ static rt_size_t rt_uart_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_si
return 0;
}
static rt_size_t rt_uart_write(rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size)
static rt_size_t rt_uart_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
{
char *ptr;
ptr = (char*)buffer;
ptr = (char *)buffer;
if (dev->flag & RT_DEVICE_FLAG_STREAM)
{
......@@ -264,13 +265,13 @@ static rt_size_t rt_uart_write(rt_device_t dev, rt_off_t pos, const void* buffer
if (*ptr == '\n')
{
/* THRE status, contain valid data */
while ( !(LPC_UART->LSR & LSR_THRE) );
while (!(LPC_UART->LSR & LSR_THRE));
/* write data */
LPC_UART->THR = '\r';
}
/* THRE status, contain valid data */
while ( !(LPC_UART->LSR & LSR_THRE) );
while (!(LPC_UART->LSR & LSR_THRE));
/* write data */
LPC_UART->THR = *ptr;
......@@ -280,10 +281,10 @@ static rt_size_t rt_uart_write(rt_device_t dev, rt_off_t pos, const void* buffer
}
else
{
while ( size != 0 )
while (size != 0)
{
/* THRE status, contain valid data */
while ( !(LPC_UART->LSR & LSR_THRE) );
while (!(LPC_UART->LSR & LSR_THRE));
/* write data */
LPC_UART->THR = *ptr;
......@@ -298,7 +299,7 @@ static rt_size_t rt_uart_write(rt_device_t dev, rt_off_t pos, const void* buffer
void rt_hw_uart_init(void)
{
struct rt_uart_lpc* uart;
struct rt_uart_lpc *uart;
/* get uart device */
uart = &uart_device;
......
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