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rt-thread/bsp/xplorer4330/drivers/drv_uart.c

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/*
* File : drv_uart.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2009-2013 RT-Thread Develop 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
* 2013-05-18 Bernard The first version for LPC40xx
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#include "board.h"
#include "drv_uart.h"
struct lpc_uart
{
LPC_USARTn_Type *USART;
IRQn_Type USART_IRQn;
};
static rt_err_t lpc_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
// struct lpc_uart *uart;
RT_ASSERT(serial != RT_NULL);
// uart = (struct lpc_uart *)serial->parent.user_data;
// Initialize FIFO for UART0 peripheral
// UART_FIFOConfig(uart->USART, &UARTFIFOConfigStruct);
// UART_TxCmd(uart->USART, ENABLE);
return RT_EOK;
}
static rt_err_t lpc_control(struct rt_serial_device *serial, int cmd, void *arg)
{
struct lpc_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct lpc_uart *)serial->parent.user_data;
switch (cmd)
{
case RT_DEVICE_CTRL_CLR_INT:
/* disable rx irq */
uart->USART->IER &= ~UART_IER_RBRINT_EN;
break;
case RT_DEVICE_CTRL_SET_INT:
/* enable rx irq */
uart->USART->IER |= UART_IER_RBRINT_EN;
break;
}
return RT_EOK;
}
static int lpc_putc(struct rt_serial_device *serial, char c)
{
struct lpc_uart *uart;
uart = (struct lpc_uart *)serial->parent.user_data;
while (!(uart->USART->LSR & 0x20));
uart->USART->THR = c;
return 1;
}
static int lpc_getc(struct rt_serial_device *serial)
{
struct lpc_uart *uart;
uart = (struct lpc_uart *)serial->parent.user_data;
if (uart->USART->LSR & 0x01)
{
return (uart->USART->RBR);
}
return -1;
}
static const struct rt_uart_ops lpc_uart_ops =
{
lpc_configure,
lpc_control,
lpc_putc,
lpc_getc,
};
#if defined(RT_USING_UART0)
/* UART0 device driver structure */
struct serial_ringbuffer uart0_int_rx;
struct lpc_uart uart0 =
{
LPC_USART0,
USART0_IRQn,
};
struct rt_serial_device serial0;
void UART0_IRQHandler(void)
{
struct lpc_uart *uart;
volatile uint32_t intsrc, temp;
uart = &uart0;
/* enter interrupt */
rt_interrupt_enter();
/* Determine the interrupt source */
intsrc = uart->USART->IIR & UART_IIR_INTID_MASK;
switch (intsrc)
{
case UART_IIR_INTID_RLS: /* Receive Line Status interrupt*/
/* read the line status */
intsrc = uart->USART->LSR;
/* Receive an error data */
if (intsrc & UART_LSR_PE)
{
temp = LPC_USART0->RBR;
}
break;
case UART_IIR_INTID_RDA: /* Receive data */
case UART_IIR_INTID_CTI: /* Receive data timeout */
/* read the data to buffer */
while (uart->USART->LSR & UART_LSR_RDR)
{
rt_hw_serial_isr(&serial0);
}
break;
default:
break;
}
/* leave interrupt */
rt_interrupt_leave();
}
#endif
#if defined(RT_USING_UART2)
/* UART2 device driver structure */
struct serial_ringbuffer uart2_int_rx;
struct lpc_uart uart2 =
{
LPC_USART2,
USART2_IRQn,
};
struct rt_serial_device serial2;
void UART2_IRQHandler(void)
{
struct lpc_uart *uart;
uint32_t intsrc, temp;
uart = &uart2;
/* enter interrupt */
rt_interrupt_enter();
/* Determine the interrupt source */
intsrc = uart->USART->IIR & UART_IIR_INTID_MASK;
switch (intsrc)
{
case UART_IIR_INTID_RLS: /* Receive Line Status interrupt*/
/* read the line status */
intsrc = uart->USART->LSR;
/* Receive an error data */
if (intsrc & UART_LSR_PE)
{
temp = LPC_USART0->RBR;
}
break;
case UART_IIR_INTID_RDA: /* Receive data */
case UART_IIR_INTID_CTI: /* Receive data timeout */
/* read the data to buffer */
while (uart->USART->LSR & UART_LSR_RDR)
{
rt_hw_serial_isr(&serial0);
}
break;
default:
break;
}
/* leave interrupt */
rt_interrupt_leave();
}
#endif
void rt_hw_uart_init(void)
{
struct lpc_uart *uart;
struct serial_configure config;
#ifdef RT_USING_UART0
uart = &uart0;
config.baud_rate = BAUD_RATE_115200;
config.bit_order = BIT_ORDER_LSB;
config.data_bits = DATA_BITS_8;
config.parity = PARITY_NONE;
config.stop_bits = STOP_BITS_1;
config.invert = NRZ_NORMAL;
serial0.ops = &lpc_uart_ops;
serial0.int_rx = &uart0_int_rx;
serial0.config = config;
/* Enable GPIO register interface clock */
LPC_CCU1->CLK_M4_GPIO_CFG |= 0x01;
while (!(LPC_CCU1->CLK_M4_GPIO_STAT & 0x01));
/* Enable USART1 peripheral clock */
LPC_CCU2->CLK_APB0_USART0_CFG |= 0x01;
while (!(LPC_CCU2->CLK_APB0_USART0_STAT & 0x01));
/* Enable USART1 register interface clock */
LPC_CCU1->CLK_M4_USART0_CFG |= 0x01;
while (!(LPC_CCU1->CLK_M4_USART0_STAT & 0x01));
/* Init GPIO pins */
LPC_SCU->SFSP6_4 = (1 << 6) | /* Input buffer enabled */
(1 << 4) | /* Pull-up disabled */
(2 << 0) ; /* Pin P6_4 used as U0_TXD */
LPC_SCU->SFSP6_5 = (1 << 6) | /* Input buffer enabled */
(1 << 4) | /* Pull-up disabled */
(2 << 0) ; /* Pin P6_5 used as U0_RXD */
/* Init USART0 */
LPC_USART0->LCR = 0x83; /* 8 bits, no Parity, 1 Stop bit */
LPC_USART0->DLL = 0x06; /* 115200 Baudrate @ 12 MHz IRC */
LPC_USART0->DLM = 0x00;
LPC_USART0->FDR = 0xC1;
LPC_USART0->LCR = 0x03; /* DLAB = 0 */
/* enable the receive interrupt */
LPC_USART0->IER |= UART_IER_RBRINT_EN;
/* preemption = 1, sub-priority = 1 */
NVIC_SetPriority(uart->USART_IRQn, ((0x01 << 3) | 0x01));
/* Enable Interrupt for UART channel */
NVIC_EnableIRQ(uart->USART_IRQn);
/* register UART1 device */
rt_hw_serial_register(&serial0, "uart0",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
uart);
#endif
#ifdef RT_USING_UART2
uart = &uart2;
config.baud_rate = BAUD_RATE_115200;
config.bit_order = BIT_ORDER_LSB;
config.data_bits = DATA_BITS_8;
config.parity = PARITY_NONE;
config.stop_bits = STOP_BITS_1;
config.invert = NRZ_NORMAL;
serial2.ops = &lpc_uart_ops;
serial2.int_rx = &uart2_int_rx;
serial2.config = config;
/* Enable GPIO register interface clock */
LPC_CCU1->CLK_M4_GPIO_CFG |= 0x01;
while (!(LPC_CCU1->CLK_M4_GPIO_STAT & 0x01));
/* Enable USART1 peripheral clock */
LPC_CCU2->CLK_APB0_USART0_CFG |= 0x01;
while (!(LPC_CCU2->CLK_APB2_USART2_STAT & 0x01));
/* Enable USART2 register interface clock */
LPC_CCU1->CLK_M4_USART0_CFG |= 0x01;
while (!(LPC_CCU1->CLK_M4_USART2_STAT & 0x01));
/* Init GPIO pins */
LPC_SCU->SFSP1_15 = (1 << 6) | /* Input buffer enabled */
(1 << 4) | /* Pull-up disabled */
(1 << 0) ; /* Pin P1_15 used as U2_TXD */
LPC_SCU->SFSP1_16 = (1 << 6) | /* Input buffer enabled */
(1 << 4) | /* Pull-up disabled */
(1 << 0) ; /* Pin P1_16 used as U2_RXD */
/* Init USART2 */
LPC_USART2->LCR = 0x83; /* 8 bits, no Parity, 1 Stop bit */
LPC_USART2->DLL = 0x06; /* 115200 Baudrate @ 12 MHz IRC */
LPC_USART2->DLM = 0x00;
LPC_USART2->FDR = 0xC1;
LPC_USART2->LCR = 0x03; /* DLAB = 0 */
/* enable the receive interrupt */
LPC_USART2->IER |= UART_IER_RBRINT_EN;
/* preemption = 1, sub-priority = 1 */
NVIC_SetPriority(uart->USART_IRQn, ((0x01 << 3) | 0x01));
/* Enable Interrupt for UART channel */
NVIC_EnableIRQ(uart->USART_IRQn);
/* register UART1 device */
rt_hw_serial_register(&serial2, "uart2",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
uart);
#endif
}
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