simple_uart/simple_uart_test.c at master · andkae/simple_uart · GitHub

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#include "acutest.h"
#include "simple_uart.h"

#define UART_LOOPBACK_1 "/tmp/ttyS0"
#define UART_LOOPBACK_2 "/tmp/ttyS1"

static pid_t setup_loopback(void)
{
	pid_t pid;
	char *const args[] = {"socat", "PTY,link=" UART_LOOPBACK_1 ",raw,echo=0,iexten=0", "PTY,link=" UART_LOOPBACK_2 ",raw,echo=0,iexten=0", NULL};
	pid = fork();

	TEST_ASSERT(pid >= 0);

	if (pid == 0)
	{
		execvp(args[0], args);
	}
	/* Give it time to start */
	usleep(100000);
	return pid;
}

static void shutdown_loopback(pid_t pid)
{
	kill(pid, SIGHUP);
	waitpid(pid, NULL, 0);
	/* kill off loopback */
}

void test_open(void)
{
	struct simple_uart *uart;
	pid_t pid;

	pid = setup_loopback();

	uart = simple_uart_open(UART_LOOPBACK_1, 115200, "8N1");
	TEST_ASSERT(uart != NULL);
	simple_uart_close(uart);

	shutdown_loopback(pid);
}

void test_loopback(void)
{
	struct simple_uart *u1, *u2;
	char buffer[10];
	pid_t pid;

	pid = setup_loopback();

	u1 = simple_uart_open(UART_LOOPBACK_1, 115200, "8N1");
	TEST_ASSERT(u1 != NULL);
	u2 = simple_uart_open(UART_LOOPBACK_2, 115200, "8N1");
	TEST_ASSERT(u2 != NULL);

	TEST_ASSERT(simple_uart_write(u1, "foo", 3) == 3);
	usleep(1000);
	TEST_ASSERT(simple_uart_read(u2, buffer, sizeof(buffer)) == 3);
	TEST_ASSERT(memcmp(buffer, "foo", 3) == 0);

	TEST_ASSERT(simple_uart_write(u2, "fnord", 5) == 5);
	usleep(1000);
	TEST_ASSERT(simple_uart_read(u1, buffer, sizeof(buffer)) == 5);
	TEST_ASSERT(memcmp(buffer, "fnord", 5) == 0);

	simple_uart_close(u1);
	simple_uart_close(u2);
	shutdown_loopback(pid);
}

void test_loopback_random(void)
{
	struct simple_uart *u1, *u2;
	pid_t pid;

	pid = setup_loopback();

	u1 = simple_uart_open(UART_LOOPBACK_1, 115200, "8N1");
	TEST_ASSERT(u1 != NULL);
	u2 = simple_uart_open(UART_LOOPBACK_2, 115200, "8N1");
	TEST_ASSERT(u2 != NULL);

	for (int i = 0; i < 100; i++) {
		unsigned char tx[100];
		unsigned char rx[sizeof(tx)];
		int tx_len = rand() % sizeof(tx);
		for (int j = 0; j < tx_len; j++)
			tx[j] = rand() % 256;
		memset(rx, 0, sizeof(rx));
		TEST_ASSERT(simple_uart_write(u1, tx, tx_len) == tx_len);
		usleep(1000);
		TEST_ASSERT(simple_uart_read(u2, rx, sizeof(rx)) == tx_len);
		TEST_ASSERT(memcmp(rx, tx, tx_len) == 0);
	}

	simple_uart_close(u1);
	simple_uart_close(u2);
	shutdown_loopback(pid);
}

void test_read_line(void)
{
	struct simple_uart *u1, *u2;
	char buffer[10];
	pid_t pid;

	pid = setup_loopback();

	u1 = simple_uart_open(UART_LOOPBACK_1, 115200, "8N1");
	TEST_ASSERT(u1 != NULL);
	u2 = simple_uart_open(UART_LOOPBACK_2, 115200, "8N1");
	TEST_ASSERT(u2 != NULL);

	simple_uart_write(u1, "a", 1);
	simple_uart_write(u1, "b", 1);
	simple_uart_write(u1, "\r", 1);
	TEST_ASSERT(simple_uart_read_line(u2, buffer, sizeof(buffer), 100) == 2);
	TEST_ASSERT(strcmp(buffer, "ab") == 0);

	simple_uart_write(u2, "cd\n", 3);
	TEST_ASSERT(simple_uart_read_line(u1, buffer, sizeof(buffer), 100) == 2);
	TEST_ASSERT(strcmp(buffer, "cd") == 0);

	simple_uart_write(u2, "ef", 2);
	TEST_ASSERT(simple_uart_read_line(u1, buffer, sizeof(buffer), 100) < 0);
	TEST_ASSERT(strcmp(buffer, "ef") == 0);

	simple_uart_close(u1);
	simple_uart_close(u2);
	shutdown_loopback(pid);
}

TEST_LIST = {
	{"open", test_open},
	{"loopback", test_loopback},
	{"loopback_random", test_loopback_random},
	{"read_line", test_read_line},
	{NULL, NULL},
};