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#include <rthw.h>
#include <rtthread.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include "system.h"
#include "sys/alt_irq.h"
#include "altera_avalon_uart_regs.h"
extern int alt_irq_register (alt_u32 id,
void* context,
void (*alt_isr_func)(void* isr_context, alt_u32 id) );
static void set_baudrate(unsigned int baudrate)
{
IOWR_ALTERA_AVALON_UART_DIVISOR(RS232_BASE,
(unsigned int)(ALT_CPU_FREQ/baudrate+0.5) );
}
/********* rt-thread *********/
#include <rtthread.h>
struct rt_device uart_device;
uint8_t rx_buf[100];
uint32_t rx_put_index;
uint32_t rx_get_index;
static rt_err_t rt_uart_init (rt_device_t dev)
{
set_baudrate(115200);
IOWR_ALTERA_AVALON_UART_CONTROL(RS232_BASE, 0x80);//接收中断使能
IOWR_ALTERA_AVALON_UART_STATUS(RS232_BASE, 0x0); // clean status
rx_put_index = 0;
rx_get_index = 0;
return RT_EOK;
}
static rt_err_t rt_uart_open(rt_device_t dev, rt_uint16_t oflag)
{
return RT_EOK;
}
static rt_err_t rt_uart_close(rt_device_t dev)
{
return RT_EOK;
}
static rt_ssize_t rt_uart_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
{
if( rx_get_index )
{
*(uint8_t *)buffer = rx_buf[0];
rx_get_index--;
return size;
}
return 0;
}
static rt_ssize_t rt_uart_write(rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size)
{
const char * write_point = buffer;
while(size--)
{
if(*write_point == '\n')
{
IOWR_ALTERA_AVALON_UART_TXDATA(RS232_BASE,'\r');
while( !(IORD_ALTERA_AVALON_UART_STATUS(RS232_BASE)&(1<<6)) ); // status bit6 : TRDY
}
IOWR_ALTERA_AVALON_UART_TXDATA(RS232_BASE,*write_point);
write_point++;
while( !(IORD_ALTERA_AVALON_UART_STATUS(RS232_BASE)&(1<<6)) ); // status bit6 : TRDY
}
return size;
}
static rt_err_t rt_uart_control(rt_device_t dev, int cmd, void *args)
{
return RT_EOK;
}
static void uart_isr(void * context,alt_u32 id)
{
rx_buf[rx_get_index] = IORD_ALTERA_AVALON_UART_RXDATA(RS232_BASE);
rx_get_index++;
if (uart_device.rx_indicate != RT_NULL)
{
uart_device.rx_indicate(&uart_device, 1);
}
}
void rt_hw_uart_init(void)
{
// init uart
set_baudrate(115200);
IOWR_ALTERA_AVALON_UART_CONTROL(RS232_BASE, 0x80);//接收中断使能
IOWR_ALTERA_AVALON_UART_STATUS(RS232_BASE, 0x0); // clean status
alt_irq_register(RS232_IRQ, NULL, uart_isr);
// register device
uart_device.type = RT_Device_Class_Char;
/* device interface */
uart_device.init = rt_uart_init;
uart_device.open = rt_uart_open;
uart_device.close = rt_uart_close;
uart_device.read = rt_uart_read;
uart_device.write = rt_uart_write;
uart_device.control = rt_uart_control;
uart_device.user_data = RT_NULL;
uart_device.rx_indicate = RT_NULL;
uart_device.tx_complete = RT_NULL;
rt_device_register(&uart_device,
"uart", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_STREAM | RT_DEVICE_FLAG_INT_RX);
}
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