xushaoxiang
80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
|
|
#include "Includes.h"
|
|
|
|
void retarget_init(void)
|
|
{
|
|
unsigned int val;
|
|
__read_hw_reg32(CPR_GPIO_FUN_SEL4, val);
|
|
val &= 0xFFFF;
|
|
/* GPIO18: TX; GPIO19: RX */
|
|
val |= ((1 << 16) | (2 << 24));
|
|
__write_hw_reg32(CPR_GPIO_FUN_SEL4, val);
|
|
/* Reset uart module */
|
|
__write_hw_reg32(CPR_RSTCTL_SUBRST_SW, 0x10000);
|
|
/* Unreset uart module */
|
|
__write_hw_reg32(CPR_RSTCTL_SUBRST_SW, 0x10001);
|
|
/* Enable uart0 pclk */
|
|
__write_hw_reg32(CPR_CTLAPBCLKEN_GRCTL, 0x100010);
|
|
/* Set the first-level division ratio of uart0_clk relative to the 12MHz clock */
|
|
__write_hw_reg32(CPR_UART0_CLK_GRCTL, 0x110018);
|
|
/* Set the secondary frequency division coefficient of uart0_clk relative to the 12MHz clock */
|
|
//__write_hw_reg32(CPR_UART0_CLK_CTL, 0x0600271);//57600-OSC12M
|
|
__write_hw_reg32(CPR_UART0_CLK_CTL, 0x0480271); // 115200-OSC32M
|
|
//__write_hw_reg32(CPR_UART0_CLK_CTL, 0x1800271);//230400-OSC12M
|
|
//__write_hw_reg32(CPR_UART0_CLK_CTL, 0x0C00271);//115200-OSC12M
|
|
/* Enable DLAB */
|
|
__write_hw_reg32(UART0_TCR, 0x80);
|
|
/* Control the baud rate */
|
|
__write_hw_reg32(UART0_DLL, 0x01);
|
|
/* Control the baud rate */
|
|
__write_hw_reg32(UART0_DLH, 0x00);
|
|
/* Set the data bit of the serial port */
|
|
__write_hw_reg32(UART0_TCR, 0x03);
|
|
/* Set the interrupt threshold of transmit FIFO and receive FIFO and Clear the transmit and receive FIFO, Finally enable FIFO */
|
|
__write_hw_reg32(UART0_FCR, 0x37);
|
|
printf("\n SYSTEM BUILD TIME: %s %s \n", __DATE__, __TIME__);
|
|
}
|
|
|
|
int sendchar(int c)
|
|
{
|
|
//return 0;
|
|
unsigned int status;
|
|
for (;;)
|
|
{
|
|
status = (*((volatile unsigned *)(0x40010000 + 0x14)));
|
|
status &= 0x20;
|
|
if (status == 0x20)
|
|
break;
|
|
}
|
|
(*((volatile unsigned *)(0x40010000 + 0x00))) = c;
|
|
return (1);
|
|
}
|
|
|
|
struct __FILE
|
|
{
|
|
int handle; /* Add whatever you need here */
|
|
};
|
|
FILE __stdout;
|
|
|
|
int fputc(int ch, FILE *f)
|
|
{
|
|
return (sendchar(ch));
|
|
}
|
|
|
|
int ferror(FILE *f)
|
|
{
|
|
/* Your implementation of ferror */
|
|
return EOF;
|
|
}
|
|
|
|
void _ttywrch(int ch)
|
|
{
|
|
sendchar(ch);
|
|
}
|
|
|
|
void _sys_exit(int return_code)
|
|
{
|
|
label:
|
|
goto label; /* endless loop */
|
|
}
|