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AP_HAL:examples:Printf: Improvements in the Printf example

This commit is contained in:
Arsh 2021-01-07 19:59:31 +05:30 committed by Peter Barker
parent e13a35abc1
commit 18f56fbac5
1 changed files with 53 additions and 31 deletions
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66
libraries/AP_HAL/examples/Printf/Printf.cpp
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@ -1,18 +1,40 @@
/*
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
Printf.cpp: We demonstrate the use of the printf() and snprintf() functions
*/
#include <AP_Common/AP_Common.h>
#include <AP_HAL/AP_HAL.h>
void setup();
void loop();
void setup(); // declaration of the setup() function
void loop(); // declaration of the loop() function
const AP_HAL::HAL& hal = AP_HAL::get_HAL();
const AP_HAL::HAL& hal = AP_HAL::get_HAL(); // create a reference to AP_HAL::HAL object to get access to hardware specific functions. For more info see <https://ardupilot.org/dev/docs/learning-ardupilot-the-example-sketches.html/>
// the setup function runs once when the board powers up
void setup(void) {
hal.console->printf("Starting Printf test\n");
hal.console->printf("Starting Printf test\n"); // print a starting message
}
//create a struct array float_tests
static const struct {
// holds the char sequence representing the format specifier
const char *fmt;
// holds a float value
float v;
// holds the char sequence that would be printed in accordance with the format specifier defined(fmt)
const char *result;
} float_tests[] = {
{ "%f", 3.71f, "3.710000" },
@ -47,16 +69,20 @@ static const struct {
{ "%.1f", 10.6f, "10.6" },
};
// test_printf_floats(void) : tests the printf() and snprintf() function against the float numbers defined in float_tests
static void test_printf_floats(void)
{
hal.console->printf("Starting Printf floats test\n");
uint8_t i;
// 30 bytes long char buffer(Expected length of string : 29)
char buf[30];
uint8_t failures = 0;
hal.console->printf("Running printf tests\n");
for (i=0; i < ARRAY_SIZE(float_tests); i++) {
int ret = hal.util->snprintf(buf, sizeof(buf), float_tests[i].fmt, (double)float_tests[i].v);
// create a format string(buf) in accordance with the format specifier and the float values defined for every element of float_tests[]
int ret = hal.util->snprintf(buf, sizeof(buf), float_tests[i].fmt, (double)float_tests[i].v); //For more info, see : http://www.cplusplus.com/reference/cstdio/snprintf/
// comparing the results of the snprintf() and results defined in the float_tests[] :
// 1. check whether the strings are equal or not
if (strcmp(buf, float_tests[i].result) != 0) {
hal.console->printf("Failed float_tests[%u] '%s' -> '%s' should be '%s'\n",
(unsigned)i,
@ -65,6 +91,7 @@ static void test_printf_floats(void)
float_tests[i].result);
failures++;
}
// 2. check whether the len of the strings is equal or not
if (ret != (int)strlen(float_tests[i].result)) {
hal.console->printf("Failed float_tests[%u] ret=%d/%d '%s' should be '%s'\n",
(unsigned)i,
@ -77,33 +104,26 @@ static void test_printf_floats(void)
hal.console->printf("%u failures\n", (unsigned)failures);
}
// test_printf_null_termination(void) : tests the printf() and the snprintf() function against a char sequence and whether they consider the terminating null character '\0'
static void test_printf_null_termination(void)
{
hal.console->printf("Starting Printf null-termination tests\n");
{
// 10 bytes long char buffer(Expected length of string : 9)
char buf[10];
int ret = hal.util->snprintf(buf,sizeof(buf), "%s", "ABCDEABCDE");
// create a format string(buf) in accordance with "ABCDEABCDE" and length of buf[]
int ret = hal.util->snprintf(buf,sizeof(buf), "%s", "ABCDEABCDE"); //For more info, see : http://www.cplusplus.com/reference/cstdio/snprintf/
// store the expected length of string
const int want = 9;
// comparing the results of the snprintf() function :
// 1. check whether the expected length of the string is equal to the buffer(buf) length or not
if (ret != want) {
hal.console->printf("snprintf returned %d expected %d\n", ret, want);
}
// 2. check whether the buffer(buf) is equal to "ABCDEABCD" or not
if (!strncmp(buf, "ABCDEABCD", sizeof(buf))) {
hal.console->printf("Bad snprintf string (%s)\n", buf);
}
}
{
char buf[10];
int ret = hal.util->snprintf(buf,sizeof(buf), "ABCDEABCDE");
const int want = 9;
if (ret != want) {
hal.console->printf("snprintf returned %d expected %d\n", ret, want);
}
if (!strncmp(buf, "ABCDEABCD", sizeof(buf))) {
hal.console->printf("Bad snprintf string (%s)\n", buf);
}
}
}
static void test_printf(void)
{
@ -111,10 +131,12 @@ static void test_printf(void)
test_printf_null_termination();
}
// the loop function runs over and over again forever
void loop(void)
{
test_printf();
// give a delay of 1000ms or 1s
hal.scheduler->delay(1000);
}
AP_HAL_MAIN();
AP_HAL_MAIN(); // HAL Macro that declares the main function. For more info see <https://ardupilot.org/dev/docs/learning-ardupilot-the-example-sketches.html/>