Lesson 03: PSoC Creator System Reference Guild - Data Types and APIs
PSoC Creator providers some useful APIs that can be used in your code.
- Standard C data types (implicit sizes)
Type Size
(Bytes)Range Description Precision
(Decimal place)printf() identifier char 1 unsigned: 0 ... 255
signed: -128 ... 127Character %c short 2 unsigned: 0 ... 65535
signed:-32,768 ... 32767Standard type specifying 2-byte integers %i int 4 unsigned: 0 ... 4,294,967,295
signed:-2,147,483,648 ... 2,147,483,647Integer number %i long 4 unsigned: 0 ... 4,294,967,295
signed:-2,147,483,648 ... 2,147,483,647%i float 4 1.175e-38 ... 3.40e+38 Signal presision floating point number 6 %f double 8 2.3E-308 ... 1.7E+308 Double presision floating point number 15 %f long double 8 2.3E-308 ... 1.7E+308 %f enum 1
21 byte if enum < 256
2 bytes if enum > 256 0 ... 65535Used to define a list of aliases that represent integers - Cypress-defined data types
Type Description char8 8-bit (signed or unsigned, depending on the compiler selection for char) uint8 8-bit unsigned integer uint16 16-bit unsigned integer uint32 32-bit unsigned integer int8 8-bit signed integer int16 16-bit signed integer int32 32-bit signed integer - Types available through <stdint.h>
Type Description uint8_t 8-bit unsigned integer uint16_t 16-bit unsigned integer uint32_t 32-bit unsigned integer uint64_t 64-bit unsigned integer int8_t 8-bit signed integer int16_t 16-bit signed integer int32_t 32-bit signed integer int64_t 64-bit signed integer - Delay Functions
Function Prototype Arguments Description void CyDelay(uint32 milliseconds) uint32 milliseconds –
Number of milliseconds to delayDelay by the specified number of milliseconds. Ex. To delay 2.5 second → CyDelay(2500); void CyDelayUs(uint32 microseconds) uint32 microseconds –
Number of microseconds to delayDelay by the specified number of microseconds. Ex. To delay 500 microsecond → CyDelayUs(500); void CyDelayFreq(uint32 freq) uint32 freq –
Bus clock frequency in Hz;
0: Use default value
Nonzero: Set freq valueSets the Bus Clock frequency used to calculate the number of cycles needed to implement a delay with CyDelay or CyDelayUs functions.
By default, the frequency used is based on the value determined by PSoC Creator at build time.void CyDelayCycles(uint32 cycles) uint32 cycles –
Number of cycles to delayDelay by the specified number of cycles using a software delay loop - Macro statements
CyGlobalIntEnable Enables interrupts using the global interrupt mask CyGlobalIntDisable Disable interrupts using the global interrupt mask
Here, lists some useful defines:
/* ======================================== * * Copyright YOUR COMPANY, THE YEAR * All Rights Reserved * UNPUBLISHED, LICENSED SOFTWARE. * * CONFIDENTIAL AND PROPRIETARY INFORMATION * WHICH IS THE PROPERTY OF your company. * * ======================================== */ #ifndef MY_DEFINE_H #define MY_DEFINE_H #include <stdint.h> #include <stdbool.h> #include <stdlib.h> #include <string.h> #include <math.h> #define HIGH 0x1 #define LOW 0x0 #define INPUT 0x0 #define OUTPUT 0x1 #define PI 3.1415926535897932384626433832795 #define HALF_PI 1.5707963267948966192313216916398 #define TWO_PI 6.283185307179586476925286766559 #define DEG_TO_RAD 0.017453292519943295769236907684886 #define RAD_TO_DEG 57.295779513082320876798154814105 #define MIN(a,b) ((a)<(b)?(a):(b)) #define MAX(a,b) ((a)>(b)?(a):(b)) #define ABS(x) ((x)>0?(x):-(x)) #define CONSTRAIN(amt,low,high) ((amt)<(low)?(low):((amt)>(high)?(high):(amt))) #define ROUND(x) ((x)>=0?(long)((x)+0.5):(long)((x)-0.5)) #define RADIANS(deg) ((deg)*DEG_TO_RAD) #define DEGREES(rad) ((rad)*RAD_TO_DEG) #define SQ(x) ((x)*(x)) #define LOWBYTE(w) ((uint8_t) ((w) & 0xff)) #define HIGHBYTE(w) ((uint8_t) ((w) >> 8)) #define BITREAD(value, bit) (((value) >> (bit)) & 0x01) #define BITSET(value, bit) ((value) |= (1UL << (bit))) #define BITCLEAR(value, bit) ((value) &= ~(1UL << (bit))) #define BITWRITE(value, bit, bitvalue) (bitvalue ? bitSet(value, bit) : bitClear(value, bit)) #define BIT(b) (1UL << (b)) typedef unsigned int word; typedef uint8_t byte; #endif