mirror of
https://github.com/RT-Thread/rt-thread.git
synced 2025-12-26 09:08:25 +00:00
add raspi2 and raspi3 BSP
This commit is contained in:
bigmagic
199
bsp/raspberry-pi/raspi2/driver/drv_uart.c
Normal file
199
bsp/raspberry-pi/raspi2/driver/drv_uart.c
Normal file
@@ -0,0 +1,199 @@
|
||||
/*
|
||||
* File : drv_uart.c
|
||||
* This file is part of RT-Thread RTOS
|
||||
* COPYRIGHT (C) 2017, RT-Thread Development Team
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License along
|
||||
* with this program; if not, write to the Free Software Foundation, Inc.,
|
||||
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
||||
*
|
||||
* Change Logs:
|
||||
* Date Author Notes
|
||||
* 2018/5/5 Bernard The first version
|
||||
*/
|
||||
|
||||
#include <rthw.h>
|
||||
#include <rtthread.h>
|
||||
#include <rtdevice.h>
|
||||
|
||||
#include "board.h"
|
||||
#include "drv_uart.h"
|
||||
|
||||
#include <rtdevice.h>
|
||||
|
||||
#define AUX_BASE (0x3F000000 + 0x215000)
|
||||
|
||||
struct hw_uart_device
|
||||
{
|
||||
rt_uint32_t hw_base;
|
||||
rt_uint32_t irqno;
|
||||
};
|
||||
|
||||
static rt_err_t uart_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
|
||||
{
|
||||
struct hw_uart_device *uart;
|
||||
|
||||
RT_ASSERT(serial != RT_NULL);
|
||||
uart = (struct hw_uart_device *)serial->parent.user_data;
|
||||
|
||||
if (uart->hw_base == AUX_BASE)
|
||||
{
|
||||
uint32_t value;
|
||||
|
||||
/* GPIO function set */
|
||||
value = GPIO_GPFSEL1;
|
||||
value &= ~(7<<12); /* GPIO14 */
|
||||
value |= 2<<12 ; /* ALT5 */
|
||||
value &= ~(7<<15); /* GPIO15 */
|
||||
value |= 2<<15 ; /* ALT5 */
|
||||
GPIO_GPFSEL1 = value;
|
||||
|
||||
/* PullUD disable */
|
||||
GPIO_GPPUD = 0;
|
||||
GPIO_GPPUDCLK0 = (1 << 14) | (1 << 15);
|
||||
GPIO_GPPUDCLK0 = 0;
|
||||
|
||||
AUX_ENABLES(uart->hw_base) = 1; /* Enable UART1 */
|
||||
AUX_MU_IER_REG(uart->hw_base) = 0; /* Disable interrupt */
|
||||
AUX_MU_CNTL_REG(uart->hw_base) = 0; /* Disable Transmitter and Receiver */
|
||||
AUX_MU_LCR_REG(uart->hw_base) = 3; /* Works in 8-bit mode */
|
||||
AUX_MU_MCR_REG(uart->hw_base) = 0; /* Disable RTS */
|
||||
AUX_MU_IIR_REG(uart->hw_base) = 0xC6; /* Enable FIFO, Clear FIFO */
|
||||
AUX_MU_BAUD_REG(uart->hw_base) = 270; /* 115200 = system clock 250MHz / (8 * (baud + 1)), baud = 270 */
|
||||
AUX_MU_CNTL_REG(uart->hw_base) = 3; /* Enable Transmitter and Receiver */
|
||||
}
|
||||
|
||||
return RT_EOK;
|
||||
}
|
||||
|
||||
static rt_err_t uart_control(struct rt_serial_device *serial, int cmd, void *arg)
|
||||
{
|
||||
struct hw_uart_device *uart;
|
||||
|
||||
RT_ASSERT(serial != RT_NULL);
|
||||
uart = (struct hw_uart_device *)serial->parent.user_data;
|
||||
|
||||
switch (cmd)
|
||||
{
|
||||
case RT_DEVICE_CTRL_CLR_INT:
|
||||
/* disable rx irq */
|
||||
AUX_MU_IER_REG(uart->hw_base) = 0x0;
|
||||
rt_hw_interrupt_mask(uart->irqno);
|
||||
break;
|
||||
|
||||
case RT_DEVICE_CTRL_SET_INT:
|
||||
/* enable rx irq */
|
||||
AUX_MU_IER_REG(uart->hw_base) = 0x1;
|
||||
rt_hw_interrupt_umask(uart->irqno);
|
||||
break;
|
||||
}
|
||||
|
||||
return RT_EOK;
|
||||
}
|
||||
|
||||
static int uart_putc(struct rt_serial_device *serial, char c)
|
||||
{
|
||||
struct hw_uart_device *uart;
|
||||
|
||||
RT_ASSERT(serial != RT_NULL);
|
||||
uart = (struct hw_uart_device *)serial->parent.user_data;
|
||||
|
||||
while (!(AUX_MU_LSR_REG(uart->hw_base) & 0x20));
|
||||
AUX_MU_IO_REG(uart->hw_base) = c;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int uart_getc(struct rt_serial_device *serial)
|
||||
{
|
||||
int ch = -1;
|
||||
struct hw_uart_device *uart;
|
||||
|
||||
RT_ASSERT(serial != RT_NULL);
|
||||
uart = (struct hw_uart_device *)serial->parent.user_data;
|
||||
|
||||
if ((AUX_MU_LSR_REG(uart->hw_base) & 0x01))
|
||||
{
|
||||
ch = AUX_MU_IO_REG(uart->hw_base) & 0xff;
|
||||
}
|
||||
|
||||
return ch;
|
||||
}
|
||||
|
||||
static const struct rt_uart_ops _uart_ops =
|
||||
{
|
||||
uart_configure,
|
||||
uart_control,
|
||||
uart_putc,
|
||||
uart_getc,
|
||||
};
|
||||
|
||||
static void rt_hw_uart_isr(int irqno, void *param)
|
||||
{
|
||||
struct rt_serial_device *serial = (struct rt_serial_device*)param;
|
||||
|
||||
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
|
||||
}
|
||||
|
||||
#ifdef RT_USING_UART0
|
||||
/* UART device driver structure */
|
||||
static struct hw_uart_device _uart0_device =
|
||||
{
|
||||
RPI_UART0_BASE,
|
||||
IRQ_PBA8_UART0,
|
||||
};
|
||||
static struct rt_serial_device _serial0;
|
||||
#endif
|
||||
|
||||
#ifdef RT_USING_UART1
|
||||
/* UART1 device driver structure */
|
||||
static struct hw_uart_device _uart1_device =
|
||||
{
|
||||
AUX_BASE,
|
||||
IRQ_AUX,
|
||||
};
|
||||
static struct rt_serial_device _serial1;
|
||||
#endif
|
||||
|
||||
int rt_hw_uart_init(void)
|
||||
{
|
||||
struct hw_uart_device *uart;
|
||||
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
|
||||
|
||||
#ifdef RT_USING_UART0
|
||||
uart = &_uart0_device;
|
||||
|
||||
_serial0.ops = &_uart_ops;
|
||||
_serial0.config = config;
|
||||
|
||||
/* register UART1 device */
|
||||
rt_hw_serial_register(&_serial0, "uart0",
|
||||
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
|
||||
uart);
|
||||
rt_hw_interrupt_install(uart->irqno, rt_hw_uart_isr, &_serial0, "uart0");
|
||||
#endif
|
||||
|
||||
#ifdef RT_USING_UART1
|
||||
uart = &_uart1_device;
|
||||
_serial1.ops = &_uart_ops;
|
||||
_serial1.config = config;
|
||||
|
||||
/* register UART1 device */
|
||||
rt_hw_serial_register(&_serial1, "uart1",
|
||||
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX, uart);
|
||||
/* enable Rx and Tx of UART */
|
||||
rt_hw_interrupt_install(uart->irqno, rt_hw_uart_isr, &_serial1, "uart1");
|
||||
#endif
|
||||
|
||||
return 0;
|
||||
}
|
||||
Reference in New Issue
Block a user