Hi again,
I'm fiddling with Pins Tools (MCUXpresso 11.4.0) and example code "led_blinky" from the LPC5526 SDK.
I added another GPIO output with "Invert" set to "disabled" as follows:
Pins Tool generates this code (relevant parts only):
gpio_pin_config_t LED_RED_config = {
.pinDirection = kGPIO_DigitalOutput,
.outputLogic = 0U
};
/* Initialize GPIO functionality on pin PIO0_7 (pin 6) */
GPIO_PinInit(BOARD_INITPINS_LED_RED_GPIO, BOARD_INITPINS_LED_RED_PORT, BOARD_INITPINS_LED_RED_PIN, &LED_RED_config);
const uint32_t LED_RED = (/* Pin is configured as PIO0_7 */
IOCON_PIO_FUNC0 |
/* No addition pin function */
IOCON_PIO_MODE_INACT |
/* Standard mode, output slew rate control is enabled */
IOCON_PIO_SLEW_STANDARD |
/* Input function is not inverted */
IOCON_PIO_INV_DI |
/* Enables digital function */
IOCON_PIO_DIGITAL_EN |
/* Open drain is disabled */
IOCON_PIO_OPENDRAIN_DI);
/* PORT0 PIN7 (coords: 6) is configured as PIO0_7 */
IOCON_PinMuxSet(IOCON, BOARD_INITPINS_LED_RED_PORT, BOARD_INITPINS_LED_RED_PIN, LED_RED);
Now in Pins Tool I switch "Invert" to "Reset (Disabled)" (which should be the same configuration as before):
Spot the difference? Disabled is in italics now.
The generated code, however, looks mighty different:
IOCON->PIO[0][7] =
((IOCON->PIO[0][7] &
/* Mask bits to zero which are setting */
(~(IOCON_PIO_FUNC_MASK | IOCON_PIO_MODE_MASK | IOCON_PIO_SLEW_MASK | IOCON_PIO_DIGIMODE_MASK | IOCON_PIO_OD_MASK)))
/* Selects pin function.
* : PORT07 (pin 6) is configured as PIO0_7. */
| IOCON_PIO_FUNC(PIO0_7_FUNC_ALT0)
/* Selects function mode (on-chip pull-up/pull-down resistor control).
* : Inactive.
* Inactive (no pull-down/pull-up resistor enabled). */
| IOCON_PIO_MODE(PIO0_7_MODE_INACTIVE)
/* Driver slew rate.
* : Standard-mode, output slew rate is slower.
* More outputs can be switched simultaneously. */
| IOCON_PIO_SLEW(PIO0_7_SLEW_STANDARD)
/* Select Digital mode.
* : Enable Digital mode.
* Digital input is enabled. */
| IOCON_PIO_DIGIMODE(PIO0_7_DIGIMODE_DIGITAL)
/* Controls open-drain mode.
* : Normal.
* Normal push-pull output. */
| IOCON_PIO_OD(PIO0_7_OD_NORMAL));
I wonder why this is.
1 Solution
