Keil C中 error C141: syntax error near ‘=‘, expected ‘__asm‘

1. code¶

This piece of code is a piece of clock code designed to program the timer T0 of the 89C52 single-chip microcomputer.

#include<reg52.h>
unsigned char code ledcode[]={0x3f,0x5b,0x4f,0x66,0x7d,7,0x7f,0x6f}; //Segment code of common cathode 0-9
unsigned char data hou,min,sec,num,disbuf[]={0,0,10,0,0,10,0,0}; //Hours, minutes, seconds, num is the number of T0 interrupts, disbuf is the number of bits displayed
#define codport P0; //Display segment code output port
#define sitport P2; //Display bit code output port

void display() //Display function
{
unsigned int j; //used for loop
unsigned char i,scan; //scan is the bit code of the output control display bit, also called scan code
scan=0x01;
for(i=0;i<6;i++)
{
codport=0; //Clean the screen before displaying new content, otherwise it will display disorderly in Proteus
codport=ledcode[disbuf[i]]; //The number to be displayed is sent to the broken code port
sitport=~scan; //The low-level corresponding bit of the bit code port is valid and lights up
scan=(scan<<1);
for(j=0;j<500;j++);
}
}

2. error¶

In the following program, the compiler displays an error

clock.c(14): warning C275: expression with possibly no effect
clock.c(14): error C141: syntax error near ‘=’, expected ‘__asm’
clock.c(15): error C141: syntax error near ‘=’, expected ‘__asm’
clock.c(16): error C141: syntax error near ‘=’, expected ‘__asm’
clock.c-3 Error(s), 1 Warning(s).

The location found to be wrong is

codport=0; //Clean the screen before displaying new content, otherwise it will display disorderly in Proteus
codport=ledcode[disbuf[i]]; //The number to be displayed is sent to the broken code port
sitport=~scan; //The low-level corresponding bit of the bit code port is valid and lights up

3. solution¶

Since the bit operation is required for codport and sitport, the modification macro is defined as

#include<reg52.h>
unsigned char code ledcode[]={0x3f,0x5b,0x4f,0x66,0x7d,7,0x7f,0x6f}; //Segment code of common cathode 0-9
unsigned char data hou,min,sec,num,disbuf[]={0,0,10,0,0,10,0,0}; //Hours, minutes, seconds, num is the number of T0 interrupts, disbuf is the number of bits displayed
sibt codport=P0; //Display segment code output port
sbit sitport=P2; //Display bit code output port

Compile successfully after modification