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rt-thread-official/bsp/x1000/driver/drv_uart.c

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/*
* File : drv_uart.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2008 - 2016, 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
* 2015-11-19 Urey the first version
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#include "board.h"
#include "drv_uart.h"
struct jz_uart_s
{
rt_uint32_t hw_base;
rt_uint32_t irqno;
char name[RT_NAME_MAX];
};
static rt_err_t uart_configure (struct rt_serial_device *serial, struct serial_configure *cfg);
static rt_err_t uart_control (struct rt_serial_device *serial, int cmd, void *arg);
static int uart_putc (struct rt_serial_device *serial, char c);
static int uart_getc (struct rt_serial_device *serial);
static rt_size_t uart_dma_transmit (struct rt_serial_device *serial, const rt_uint8_t *buf, rt_size_t size, int direction);
static void uart_irq_handler (int irqno, void *param);
const struct rt_uart_ops _uart_ops =
{
uart_configure,
uart_control,
uart_putc,
uart_getc,
uart_dma_transmit
};
/*
* UART Initiation
*/
void rt_hw_uart_init(void)
{
struct rt_serial_device *serial;
struct jz_uart_s *uart;
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
#ifdef RT_USING_UART1
{
static struct rt_serial_device serial1;
static struct jz_uart_s uart1;
serial = &serial1;
uart = &uart1;
serial->ops = &_uart_ops;
serial->config = config;
serial->config.baud_rate = 115200;
uart->hw_base = UART0_BASE;
uart->irqno = IRQ_UART0;
rt_hw_serial_register(serial,
"uart1",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
uart);
}
#endif
#ifdef RT_USING_UART2
{
static struct rt_serial_device serial2;
static struct jz_uart_s uart2;
serial = &serial2;
uart = &uart2;
serial->ops = &_uart_ops;
serial->config = config;
serial->config.baud_rate = 115200;
uart->hw_base = UART2_BASE;
uart->irqno = IRQ_UART2;
rt_hw_serial_register(serial,
"uart2",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
uart);
}
#endif
#ifdef RT_USING_UART3
{
static struct rt_serial_device serial3;
static struct jz_uart_s uart3;
serial = &serial3;
uart = &uart3;
serial->ops = &_uart_ops;
serial->config = config;
serial->config.baud_rate = 115200;
uart->hw_base = UART3_BASE;
uart->irqno = IRQ_UART3;
rt_hw_serial_register(serial,
"uart3",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
uart);
}
#endif
}
/*
* UART interface
*/
static rt_err_t uart_configure (struct rt_serial_device *serial, struct serial_configure *cfg)
{
rt_uint32_t baud_div;
struct jz_uart_s * uart;
RT_ASSERT(serial != RT_NULL);
serial->config = *cfg;
uart = serial->parent.user_data;
RT_ASSERT(uart != RT_NULL);
/* Init UART Hardware */
UART_IER(uart->hw_base) = 0; /* clear interrupt */
UART_FCR(uart->hw_base) = ~UARTFCR_UUE; /* disable UART unite */
/* Enable UART clock */
/* Set both receiver and transmitter in UART mode (not SIR) */
UART_SIRCR(uart->hw_base) = ~(SIRCR_RSIRE | SIRCR_TSIRE);
/* Set databits, stopbits and parity. (8-bit data, 1 stopbit, no parity) */
UART_LCR(uart->hw_base) = UARTLCR_WLEN_8;
/* set baudrate */
#if defined(RT_USING_JZ4750) || defined(RT_USING_JZ4755) || defined(RT_USING_JZ4760)
if(REG_CPM_CPCCR & (1UL << 30))
{
/* CPCCR.ECS = 1: clock source is EXCLK/2 */
baud_div = BOARD_EXTAL_CLK / 2 / 16 / cfg->baud_rate;
}
else
#endif
{
/* CPCCR.ECS = 0: clock source is EXCLK */
baud_div = BOARD_EXTAL_CLK / 16 / cfg->baud_rate;
}
UART_LCR(uart->hw_base) |= UARTLCR_DLAB;
UART_DLHR(uart->hw_base) = (baud_div >> 8) & 0xff;
UART_DLLR(uart->hw_base) = baud_div & 0xff;
UART_LCR(uart->hw_base) &= ~UARTLCR_DLAB;
/* Enable UART unit, enable and clear FIFO */
UART_FCR(uart->hw_base) = UARTFCR_UUE | UARTFCR_FE | UARTFCR_TFLS | UARTFCR_RFLS;
return (RT_EOK);
}
static rt_err_t uart_control (struct rt_serial_device *serial, int cmd, void *arg)
{
struct jz_uart_s * uart;
uart = serial->parent.user_data;
RT_ASSERT(uart != RT_NULL);
switch (cmd)
{
case RT_DEVICE_CTRL_CLR_INT:
/* Disable the UART Interrupt */
UART_IER(uart->hw_base) &= ~(UARTIER_RIE | UARTIER_RTIE);
rt_hw_interrupt_mask(uart->irqno);
break;
case RT_DEVICE_CTRL_SET_INT:
/* install interrupt */
rt_hw_interrupt_install(uart->irqno, uart_irq_handler,
serial, uart->name);
rt_hw_interrupt_umask(uart->irqno);
/* Enable the UART Interrupt */
UART_IER(uart->hw_base) |= (UARTIER_RIE | UARTIER_RTIE);
break;
}
return (RT_EOK);
}
static int uart_putc (struct rt_serial_device *serial, char c)
{
struct jz_uart_s* uart;
uart = serial->parent.user_data;
/* FIFO status, contain valid data */
while (!((UART_LSR(uart->hw_base) & (UARTLSR_TDRQ | UARTLSR_TEMT)) == 0x60));
/* write data */
UART_TDR(uart->hw_base) = c;
return (1);
}
static int uart_getc (struct rt_serial_device *serial)
{
struct jz_uart_s* uart = serial->parent.user_data;
/* Receive Data Available */
if (UART_LSR(uart->hw_base) & UARTLSR_DR)
{
return UART_RDR(uart->hw_base);
}
return (-1);
}
static rt_size_t uart_dma_transmit (struct rt_serial_device *serial, const rt_uint8_t *buf, rt_size_t size, int direction)
{
return (0);
}
/* UART ISR */
static void uart_irq_handler(int irqno, void *param)
{
rt_ubase_t isr;
struct rt_serial_device *serial = (struct rt_serial_device*)param;
struct jz_uart_s* uart = serial->parent.user_data;
/* read interrupt status and clear it */
isr = UART_ISR(uart->hw_base);
if (isr & UARTISR_IID_RDI) /* Receive Data Available */
{
rt_hw_serial_isr(serial,RT_SERIAL_EVENT_RX_IND);
}
if(isr & UARTISR_IID_THRI)
{
rt_hw_serial_isr(serial,RT_SERIAL_EVENT_TX_DONE);
}
}
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