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tests/periph/gpio_ll: Test gpio_ll_switch_dir

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This commit is contained in:
Marian Buschsieweke 2024-01-22 18:47:40 +01:00
parent c011764022
commit 8aab69e93d
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GPG Key ID: 77AA882EC78084E6
1 changed files with 72 additions and 0 deletions
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72
tests/periph/gpio_ll/main.c
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@ -862,6 +862,74 @@ static void test_irq(void)
test_irq_level();
}
static void test_switch_dir(void)
{
bool test_passed;
puts_optional("\n"
"Testing Switching Direction\n"
"===========================\n");
uword_t mask_out = 1U << PIN_OUT_0;
uword_t mask_in = 1U << PIN_IN_0;
/* floating input must be supported by every MCU */
expect(0 == gpio_ll_init(port_in, PIN_IN_0, gpio_ll_in));
expect(0 == gpio_ll_init(port_out, PIN_OUT_0, gpio_ll_in));
gpio_conf_t conf = gpio_ll_query_conf(port_out, PIN_OUT_0);
expect(conf.state == GPIO_INPUT);
gpio_conf_t conf_orig = conf;
/* capture output state before switching from input mode to output mode, so
* that it can be restored when switching back to input mode */
uword_t out_state = gpio_ll_read_output(port_out);
/* now, switch to output mode and verify the switch */
gpio_ll_switch_dir_output(port_out, mask_out);
conf = gpio_ll_query_conf(port_out, PIN_OUT_0);
test_passed = (conf.state == GPIO_OUTPUT_PUSH_PULL);
printf_optional("Input pin can be switched to output (push-pull) mode: %s\n",
noyes[test_passed]);
expect(test_passed);
gpio_ll_clear(port_out, mask_out);
test_passed = (0 == (gpio_ll_read(port_in) & mask_in));
gpio_ll_set(port_out, mask_out);
test_passed = test_passed && (gpio_ll_read(port_in) & mask_in);
printf_optional("Pin behaves as output after switched to output mode: %s\n",
noyes[test_passed]);
expect(test_passed);
/* switch back to input mode */
gpio_ll_switch_dir_input(port_out, mask_out);
/* restore out state from before the switch */
gpio_ll_write(port_out, out_state);
/* verify we are back at the old config */
conf = gpio_ll_query_conf(port_out, PIN_OUT_0);
test_passed = (conf.bits == conf_orig.bits);
printf_optional("Returning back to input had no side effects on config: %s\n",
noyes[test_passed]);
if (!test_passed) {
puts_optional("Before:");
print_conf(conf_orig);
puts_optional("After:");
print_conf(conf);
expect(0);
}
/* Finally: check if input behaves like a proper input. For that, we
* configure the pin it is connected to (PORT_IN.PIN_IN_0) as output and
* see if we can read that from the pin used to switch back and force */
expect(0 == gpio_ll_init(port_in, PIN_IN_0, gpio_ll_out));
gpio_ll_clear(port_in, mask_in);
test_passed = (0 == (gpio_ll_read(port_out) & mask_out));
gpio_ll_set(port_in, mask_in);
test_passed = test_passed && (gpio_ll_read(port_out) & mask_out);
printf_optional("Pin behaves as input after switched back to input mode: %s\n",
noyes[test_passed]);
expect(test_passed);
}
int main(void)
{
print_details();
@ -872,6 +940,10 @@ int main(void)
test_irq();
}
if (IS_USED(MODULE_PERIPH_GPIO_LL_SWITCH_DIR)) {
test_switch_dir();
}
/* if no expect() didn't blow up until now, the test is passed */
puts("\n\nTEST SUCCEEDED");