TQ2440裸机串口问题，请大神帮忙
本帖最后由 spkk 于 2013-4-10 16:00 编辑老师给布置的任务，要求是norflash上一句代码都不能有，从启动开始写起，实现串口收到一个数据后再发回一个数据，现在问题是收到的和发送的都是乱码，不知道是启动时初始化有问题还是怎么，AXD+jlink调试时发现0x50000020和0x50000024处的数据都没有对，代码如下，希望大神能帮我分析下大概是怎么回事。。。boot.s:启动初始化的代码
;***************work mode defines***********************
USERMODE EQU 0x10
FIQMODE EQU 0x11
IRQMODE EQU 0x12
SVCMODE EQU 0x13
ABORTMODE EQU 0x17
UNDEFMODE EQU 0x1b
SYSMODE EQU 0x1f
;**************work mode defines end********************
;**************INTs defines*****************************
NOINT EQU 0xc0
SUBINTDIS EQU 0x4A00001C
IRQDIS EQU 0x80
FIQDIS EQU 0x40
;*************INTs defines end**************************
;*******************hardware defines********************
WTCON EQU 0x53000000
LOCKTIME EQU 0x4C000000
CLKDIV EQU 0x4C000014
UPLLCON EQU 0x4C000008
MPLLCON EQU 0x4C000004
M_MDIV EQU 92
M_PDIV EQU 1
M_SDIV EQU 1
U_PDIV EQU 2
U_MDIV EQU 56
U_SDIV EQU 2
;******************hardware defines end*****************
;------------------Stack Addr Define--------------------
_STACKBASEADDR EQU 0x33ff8000
StackUse EQU (_STACKBASEADDR-0x3800)
StackSvc EQU (_STACKBASEADDR-0x2800)
StackUnd EQU (_STACKBASEADDR-0x2400)
StackAbt EQU (_STACKBASEADDR-0x2000)
StackIRQ EQU (_STACKBASEADDR-0x1000)
StackFIQ EQU (_STACKBASEADDR-0x0000)
;-------------Stack Addr Define Ends--------------------
IMPORT IRQHandle
;this is used by asm
IMPORT FIQ_Exception ;the FIQ process func,used by asm
IMPORT Main
EXPORT HandlerSWI ;this is used by c
GET inc/memdef.inc
CODE32
AREA Boot,CODE,READONLY
ENTRY
Vectors
B ResetInit ;reset int.
B HandlerUndef ;the undefined int
B HandlerSWI ;software int
B HandlerPabort ;int for get command error,use for MMU
B HandlerDabort ;int for get data error,use for MMU
NOP ;reserved
;B HandlerIRQ ;int
B IRQHandle
B HandlerFIQ ;fast int
main.c 串口初始化以及发送接收//***************GPIO Defines******************
#define GPBCON (*(volatile unsigned long*)0x56000010)
#define GPBIOCON 0x00015400
#define GPBDAT (*(volatile unsigned long*)0x56000014)
#define rGPHCON (*(volatile unsigned long*)0x56000070) //Port H control
#define rGPHDAT (*(volatile unsigned long*)0x56000074) //Port H data
#define rGPHUP (*(volatile unsigned long*)0x56000078) //Pull-up control H
//****************GPIO Defines Ends***********
//**************UART Defines*****************
//uart line control
#define ULCON0 (*(volatile unsigned *)0x50000000)
//uart control
#define UCON0 (*(volatile unsigned *)0x50000004)
//uart baud rate divisor
#define UBRDIV0 (*(volatile unsigned *)0x50000028)
//uart fifo control
#define UFCON0 (*(volatile unsigned *)0x50000008)
//uart modem control
#define UMCON0 (*(volatile unsigned *)0x5000000C)
//uart TX/RX status control
#define UTRSTAT0 (*(volatile unsigned *)0x50000010)
//uart error status control
#define UERSTAT0 (*(volatile unsigned *)0x50000014)
//uart FIFO status
#define UFSRAT0 (*(volatile unsigned *)0x50000018)
//uart modem status
#define UMSTAT0 (*(volatile unsigned *)0x5000001C)
//uart transmit buffer reg.little endian
#define UTXH0 (*(volatile unsigned char*)0x50000020)
//uart receive buffer reg.little endian
#define URXH0 (*(volatile unsigned char*)0x50000024)
//TXD0 Ready,means can sent a char out
//#define TXD0READY (1<<2)
#define TXD0READY 0x2
//RXD0 Ready means can receive a char
//#define RXD0READY (1)
#define RXD0READY 0x1
//************UART Defines End***************
unsigned int PCLK;
int fireLED(int led);
int killAllLED(void);
void delay(int ms);
void uartInit(void);
void uartPutchar(unsigned char c);
unsigned char uartGetchar(void);
void Main(void){
//GPBCON = 0x00001000;//2 digit a bit,the led is from gpb5 to gpb8
//GPBDAT = 0x00000000;
unsigned char tmp = 0;
int foo,bar;
fireLED(4);
tmp = 'b';
uartInit();
uartPutchar(tmp);
while(1){
tmp = uartGetchar();
for(foo = 0;foo<1000;foo++)
{
for(bar = 0;bar<1000;bar++);
}
if(/*(int)tmp>0*/1){
unsigned char forDebug = tmp;
uartPutchar(forDebug);
}
}
return;
}
int fireLED(int led){
int foo;
unsigned long tmp = 0x100;
for(foo = led;foo > 0;foo--){
tmp*=4;
}
GPBCON = tmp;
GPBDAT = 0x00000000;
return 1;
}
int killAllLED(){
GPBDAT = 0xFFF;
return 0;
}
void uartInit(void){
int pclk = 50000000;//50MHz
int buat = 115200;
//BAUD RATE equation:
//UBRDIV0 = (int)(pclk/(buat*16))-1;
//see chapter 11 in datashit
rGPHCON |= 0xa0;//GPH2,GPH3 set to TXD0 and RXD0
//10100000b=0xa0
//see the chapter9 in datashit
rGPHUP = 0x0;/* 0x0c;*/ //enable pull up reg
ULCON0 = 0x03; //8bit
//UCON0 = 0x05;
//when the TX is empty or the FIFO stacks is reach the deep the call the INT
UFCON0 = 0x0; //disable FIFO
UMCON0 = 0x0;
UBRDIV0 = (int)((pclk/(buat*16))-1);//set the BAUD RATE
//UTRSTAT0 = 0x0;
URXH0 =0;
UTXH0 =0;
}
void uartPutchar(unsigned char c){
while(!(UTRSTAT0&TXD0READY));//wait the buffer empty
//killAllLED();
fireLED(1);
UTXH0 = c;
}
unsigned char uartGetchar(void){
while(!(UTRSTAT0&RXD0READY));//wait the buffer is full
fireLED(3);
return URXH0;
}
亲，烧写TQ2440_Test然后看串口部分初始化对不对？ 亚瑟王 发表于 2013-3-29 17:56 static/image/common/back.gif
亲，烧写TQ2440_Test然后看串口部分初始化对不对？
谢谢版主！昨天上午就解决了，是锁相环的问题，MPLL频率没有配置正确，导致串口的波特率没对，所以发送接受都是乱码。。。。。 spkk 发表于 2013-3-30 14:22 static/image/common/back.gif
谢谢版主！昨天上午就解决了，是锁相环的问题，MPLL频率没有配置正确，导致串口的波特率没对，所以发送接 ...
亲，问题解决了，请把帖子类型改为“已解决”。（方法请参考：http://www.armbbs.net/forum.php?mod=viewthread&tid=15200）。
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