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/*
* File : usart.c
* mb9bf506r uart driver
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006 - 2012, RT-Thread Development Team
*
* 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
*
* Change Logs:
* Date Author Notes
* 2012-11-30 lgnq first version
*/
#include <rtthread.h>
#include <rtdevice.h>
#include "usart.h"
#include "uart_18xx_43xx.h"
#include "scu_18xx_43xx.h"
#if defined(RT_USING_UART0)
/* UART0 device driver structure */
struct serial_ringbuffer uart0_int_rx;
struct uart_device uart0 =
{
LPC_USART0,
USART0_IRQn,
};
struct rt_serial_device serial0;
void UART0_IRQHandler(void)
{
UART_Int_Status status;
/* enter interrupt */
rt_interrupt_enter();
status = Chip_UART_GetIntStatus(LPC_USART0);
/* error */
if (status == UART_ERROR)
{
return;
}
/* ready for Read Data */
if (status & READY_TO_RECEIVE)
{
rt_hw_serial_isr(&serial0);
}
/* leave interrupt */
rt_interrupt_leave();
}
#endif
#if defined(RT_USING_UART1)
/* UART1 device driver structure */
struct serial_ringbuffer uart1_int_rx;
struct uart_device uart1 =
{
LPC_UART1,
USART1_IRQn,
};
struct rt_serial_device serial1;
void UART1_IRQHandler(void)
{
UART_Int_Status status;
/* enter interrupt */
rt_interrupt_enter();
status = Chip_UART_GetIntStatus(LPC_UART1);
/* error */
if (status == UART_ERROR)
{
return;
}
/* ready for Read Data */
if (status & READY_TO_RECEIVE)
{
rt_hw_serial_isr(&serial1);
}
/* leave interrupt */
rt_interrupt_leave();
}
#endif
#if defined(RT_USING_UART2)
/* UART2 device driver structure */
struct serial_ringbuffer uart2_int_rx;
struct uart_device uart2 =
{
LPC_USART2,
USART2_IRQn,
};
struct rt_serial_device serial2;
void UART2_IRQHandler(void)
{
UART_Int_Status status;
/* enter interrupt */
rt_interrupt_enter();
status = Chip_UART_GetIntStatus(LPC_USART2);
/* error */
if (status == UART_ERROR)
{
return;
}
/* ready for Read Data */
if (status & READY_TO_RECEIVE)
{
rt_hw_serial_isr(&serial2);
}
/* leave interrupt */
rt_interrupt_leave();
}
#endif
#if defined(RT_USING_UART3)
/* UART3 device driver structure */
struct serial_ringbuffer uart3_int_rx;
struct uart_device uart3 =
{
LPC_USART3,
USART3_IRQn,
};
struct rt_serial_device serial3;
void UART3_IRQHandler(void)
{
UART_Int_Status status;
/* enter interrupt */
rt_interrupt_enter();
status = Chip_UART_GetIntStatus(LPC_USART3);
/* error */
if (status == UART_ERROR)
{
return;
}
/* ready for Read Data */
if (status & READY_TO_RECEIVE)
{
rt_hw_serial_isr(&serial3);
}
/* leave interrupt */
rt_interrupt_leave();
}
#endif
void uart_pin_setup(void)
{
#if defined(RT_USING_UART0)
Chip_SCU_PinMux(0x6, 4, MD_PDN, FUNC2); /* P6.5 : UART0_TXD */
Chip_SCU_PinMux(0x6, 5, MD_PLN | MD_EZI | MD_ZI, FUNC2); /* P6.4 : UART0_RXD */
#endif
#if defined(RT_USING_UART1)
Chip_SCU_PinMux(0x1, 13, MD_PDN, FUNC2); /* P1.13 : UART1_TXD */
Chip_SCU_PinMux(0x1, 14, MD_PLN | MD_EZI | MD_ZI, FUNC2); /* P1.14 : UART1_RX */
#endif
}
static rt_err_t uart_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
struct uart_device *uart;
UART_DATABIT_Type databit;
UART_STOPBIT_Type stopbit;
UART_PARITY_Type parity;
/* UART FIFO configuration Struct variable */
UART_FIFO_CFG_Type UARTFIFOConfigStruct;
RT_ASSERT(serial != RT_NULL);
uart = (struct uart_device *)serial->parent.user_data;
Chip_UART_Init(uart->uart_regs);
Chip_UART_SetBaud(uart->uart_regs, cfg->baud_rate);
/* set stop bits */
switch (cfg->stop_bits)
{
case STOP_BITS_1:
stopbit = UART_STOPBIT_1;
break;
case STOP_BITS_2:
stopbit = UART_STOPBIT_2;
break;
default:
return RT_ERROR;
}
/* set data bits */
switch (cfg->data_bits)
{
case DATA_BITS_5:
databit = UART_DATABIT_5;
break;
case DATA_BITS_6:
databit = UART_DATABIT_6;
break;
case DATA_BITS_7:
databit = UART_DATABIT_7;
break;
case DATA_BITS_8:
databit = UART_DATABIT_8;
break;
default:
return RT_ERROR;
}
/* set parity */
switch (cfg->parity)
{
case PARITY_NONE:
parity = UART_PARITY_NONE;
break;
case PARITY_EVEN:
parity = UART_PARITY_EVEN;
break;
case PARITY_ODD:
parity = UART_PARITY_ODD;
break;
default:
return RT_ERROR;
}
Chip_UART_ConfigData(uart->uart_regs, databit, parity, stopbit);
/* Enable UART Transmit */
Chip_UART_TxCmd(uart->uart_regs, ENABLE);
Chip_UART_FIFOConfigStructInit(&UARTFIFOConfigStruct);
/* Enable DMA mode in UART */
UARTFIFOConfigStruct.FIFO_DMAMode = ENABLE;
/* Initialize FIFO for UART0 peripheral */
Chip_UART_FIFOConfig(uart->uart_regs, &UARTFIFOConfigStruct);
/* Enable UART Rx interrupt */
Chip_UART_IntConfig(uart->uart_regs, UART_INTCFG_RBR, ENABLE);
/* Enable UART line status interrupt */
Chip_UART_IntConfig(uart->uart_regs, UART_INTCFG_RLS, ENABLE);
/* Enable Interrupt for UART channel */
/* Priority = 1 */
NVIC_SetPriority(uart->irq_num, 1);
return RT_EOK;
}
static rt_err_t uart_control(struct rt_serial_device *serial, int cmd, void *arg)
{
struct uart_device *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct uart_device *)serial->parent.user_data;
switch (cmd)
{
case RT_DEVICE_CTRL_CLR_INT:
/* disable rx irq */
UART_DISABLE_IRQ(uart->irq_num);
break;
case RT_DEVICE_CTRL_SET_INT:
/* enable rx irq */
UART_ENABLE_IRQ(uart->irq_num);
break;
}
return (RT_EOK);
}
static int uart_putc(struct rt_serial_device *serial, char c)
{
struct uart_device *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct uart_device *)serial->parent.user_data;
/* wait send buffer is empty */
while (!(uart->uart_regs->LSR & UART_LSR_THRE))
;
/* write to send buffer */
uart->uart_regs->THR = c & UART_THR_MASKBIT;
return (1);
}
static int uart_getc(struct rt_serial_device *serial)
{
struct uart_device *uart;
uint8_t ch;
RT_ASSERT(serial != RT_NULL);
uart = (struct uart_device *)serial->parent.user_data;
/* receive buffer is full */
if (uart->uart_regs->LSR & UART_LSR_RDR)
{
ch = uart->uart_regs->RBR & UART_RBR_MASKBIT;
return (ch);
}
else
return (-1);
}
static struct rt_uart_ops uart_ops =
{
uart_configure,
uart_control,
uart_putc,
uart_getc,
};
void rt_hw_serial_init(void)
{
struct serial_configure config;
config.baud_rate = BAUD_RATE_115200;
config.data_bits = DATA_BITS_8;
config.parity = PARITY_NONE;
config.stop_bits = STOP_BITS_1;
uart_pin_setup();
#if defined(RT_USING_UART0)
serial0.ops = &uart_ops;
serial0.int_rx = &uart0_int_rx;
serial0.config = config;
/* register UART0 device */
rt_hw_serial_register(&serial0,
"uart0",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
&uart0);
#endif
#if defined(RT_USING_UART1)
serial1.ops = &uart_ops;
serial1.int_rx = &uart1_int_rx;
serial1.config = config;
/* register UART1 device */
rt_hw_serial_register(&serial1,
"uart1",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
&uart1);
#endif
#if defined(RT_USING_UART2)
serial2.ops = &uart_ops;
serial2.int_rx = &uart2_int_rx;
serial2.config = config;
/* register UART2 device */
rt_hw_serial_register(&serial2,
"uart2",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
&uart2);
#endif
#if defined(RT_USING_UART3)
serial3.ops = &uart_ops;
serial3.int_rx = &uart3_int_rx;
serial3.config = config;
/* register UART3 device */
rt_hw_serial_register(&serial3,
"uart3",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
&uart3);
#endif
}
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