85-内部148K字节SRAM读写测试，STC32G144K246实验箱演示程序
85-内部148K字节SRAM读写测试，STC32G144K246实验箱演示程序主程序main.C代码如下（汇编版本在附件中）：
/*---------------------------------------------------------------------*/
/* --- Web: www.STCAI.com ---------------------------------------------*/
/* --- BBS: www.STCAIMCU.com-----------------------------------------*/
/*---------------------------------------------------------------------*/
/*************功能说明 **************
本例程基于STC32G144K246为主控芯片的实验箱进行编写测试。
使用Keil C251编译器，Memory Model推荐设置XSmall模式，默认定义变量在edata，单时钟存取访问速度快。
edata建议保留1K给堆栈使用，空间不够时可将大数组、不常用变量加xdata关键字定义到xdata空间。
读取芯片SRAM，通过串口1(115200,N,8,1)打印结果.
项目设置"Target"页面"External Memory"-"RAM", Start:0x10000, Size:0x20000.
下载时, 默认时钟 48MHz (用户可自行修改频率).
******************************************/
#include "..\comm\STC32G144K246.h"
#define MAIN_Fosc 48000000UL
/*****************************************************************************/
#define Baudrate 115200L
#define TM (65536 -(MAIN_Fosc/Baudrate/4))
#define PrintUart 1 //1:printf 使用 UART1; 2:printf 使用 UART2
/******************** 串口打印函数 ********************/
void UartInit(void)
{
#if(PrintUart == 1)
P_SW1 &= 0x3f;
P_SW1 |= 0x00; //UART1 switch to, 0x00: P3.0 P3.1, 0x40: P3.6 P3.7, 0x80: P1.6 P1.7, 0xC0: P4.3 P4.4
SCON = (SCON & 0x3f) | 0x40;
T1x12 = 1; //定时器时钟1T模式
S1BRT = 0; //串口1选择定时器1为波特率发生器
TL1= TM;
TH1= TM>>8;
TR1 = 1; //定时器1开始计时
// SCON = (SCON & 0x3f) | 0x40;
// T2L= TM;
// T2H= TM>>8;
// AUXR |= 0x15; //串口1选择定时器2为波特率发生器
#else
S2_S = 1; //UART2 switch to: 0: P1.0 P1.1,1: P4.6 P4.7
S2CON = (S2CON & 0x3f) | 0x40;
T2L= TM;
T2H= TM>>8;
AUXR |= 0x14; //定时器2时钟1T模式,开始计时
#endif
}
void UartPutc(unsigned char dat)
{
#if(PrintUart == 1)
SBUF = dat;
while(TI==0);
TI = 0;
#else
S2BUF= dat;
while(S2TI == 0);
S2TI = 0; //Clear Tx flag
#endif
}
char putchar(char c)
{
UartPutc(c);
return c;
}
long index;
#define EDATA_LEN 16074L
#define XDATA1_LEN 65536L
#define XDATA2_LEN 65536L
#define XDATA3_LEN 4096L
unsigned char edata eRAM; //0000H~3FFFH
unsigned char xdata xRAM1; //01:0000H~01:FFFFH
unsigned char far xRAM2 _at_ 0x020000;//02:0000H~02:FFFFH
unsigned char far xRAM3 _at_ 0x030000;//03:0000H~03:0FFFH
/*****************************************************************************/
void main(void)
{
EAXFR = 1; //扩展寄存器(XFR)访问使能
CKCON = 0; //提高访问XRAM速度
P3M1 = 0x00; P3M0 = 0x02; //设置为准双向口，P31推挽输出
UartInit();
printf("SRAM Test Start.\r\n");
for(index=0;index<XDATA1_LEN;index++)
{
if(index < EDATA_LEN)
{
eRAM = (unsigned char)index;
if(eRAM != (unsigned char)index) printf("Err eRAM[%02u]=0x%02X\r\n", (unsigned int)index, eRAM);
// printf("eRAM[%02u]=0x%02X", (unsigned int)index, eRAM);
}
if(index < XDATA1_LEN)
{
xRAM1 = (unsigned char)index;
if(xRAM1 != (unsigned char)index) printf("Err xRAM1[%02u]=0x%02X\r\n", (unsigned int)index, xRAM1);
// printf("xRAM1[%02u]=0x%02X", (unsigned int)index, xRAM1);
}
if(index < XDATA2_LEN)
{
xRAM2 = (unsigned char)index;
if(xRAM2 != (unsigned char)index) printf("Err xRAM2[%02u]=0x%02X\r\n", (unsigned int)index, xRAM2);
// printf("xRAM2[%02u]=0x%02X", (unsigned int)index, xRAM2);
}
if(index < XDATA3_LEN)
{
xRAM3 = (unsigned char)index;
if(xRAM3 != (unsigned char)index) printf("Err xRAM3[%02u]=0x%02X\r\n", (unsigned int)index, xRAM3);
// printf("xRAM3[%02u]=0x%02X", (unsigned int)index, xRAM3);
}
// printf("\r\n");
}
printf("SRAM Test End.\r\n");
while(1);
}
/*****************************************************************************/
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