We have to use csprintf() to denote that the formated string is a flash string, and not a data SRAM string. This is because of the Harvard architecture of PSoC device. The following sample code shows the usage of csprintf() function.
#include <m8c.h> // part specific constants and macros
#include"PSoCAPI.h" // PSoC API definitions for all User Modules
#include <stdio.h> //definitions for all standard io functions
int result=100;
char str[]; //Character array that holds the formatted string
void main(void)
{
//Start LCD module
LCD_Start();
//LCD starting position is (0,0)
LCD_Position(0,0);
//Get the formatted string
csprintf(str,"%d",result);
//Display the string on LCD
LCD_PrString(str);
while(1);
}
The above code displays the value of the variable “result” on LCD. That is 100 will be displayed on LCD.
Due to code size requirement, the printf/scanf functions are supported in the following three forms.
1. Basic with no long / floating point, or modifier,
2. Support for long , and
3. Support for floating point.
By default the option 1 is supported. To use option 2 or 3 the following changes are required in the compiler settings.
Support for float:
1. Open local.mk file from "Projects" tab in PSoC Designer. If local.mk file is not already available, create a text file called local.mk in the project directory.
2. At the bottom of local.mk, add CODECOMPRESSOR:=$(CODECOMPRESSOR) -lfpm8c (this will link the libfpm8c.a, which contains the floating point capability of printf/scanf with modifier support)
3. Save local.mk file and build the project.
More code and data/stack space are needed for the fully featured versions (for the support of long and float).
Support for long:
1. Open local.mk file from "Projects" tab in PSoC Designer. If local.mk file does not already exist, create a text file called local.mk in the project directory.
2. At the bottom of local.mk, add CODECOMPRESSOR:=$(CODECOMPRESSOR) -llpm8c (this will link the liblpm8c.a , which contains the long data type capability of printf/scanf)
3. Save local.mk file and build the project.
The following sample code shows the usage of csprintf() function with float support.
#include <m8c.h> // part specific constants and macros
#include"PSoCAPI.h" // PSoC API definitions for all User Modules
#include <stdio.h> //definitions for all standard io functions
float result=100.235641;
char str[]; //Character array that holds the formatted string
void main(void)
{
//Start LCD module
LCD_Start();
//LCD starting position is (0,0)
LCD_Position(0,0);
//Get the formatted string
csprintf(str,"%f",result);
//Display the string on LCD
LCD_PrString(str);
while(1);
}
The above code will display 100.235641 on LCD.
Best Regards,
Dinesh
