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