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Merge "stm32l: clear and then set GPIO mode and pull-up/down settings"

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Gerrit
2012-04-24 10:44:39 -07:00
committed by Gerrit Code Review
parent 507532d081 97a49113d9
commit 3a4cd3f8f3
1 changed files with 10 additions and 6 deletions
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16
chip/stm32l/gpio.c
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@@ -29,15 +29,17 @@ int gpio_pre_init(void)
*/
STM32L_RCC_AHBENR |= 0x3f;
/* Set all GPIOs to defaults */
for (i = 0; i < GPIO_COUNT; i++, g++) {
/* bitmask for registers with 2 bits per GPIO pin */
uint32_t mask2 = (g->mask * g->mask) | (g->mask * g->mask * 2);
uint32_t val;
val = STM32L_GPIO_PUPDR_OFF(g->port) & ~mask2;
if (g->flags & GPIO_PULL_UP) /* Pull Up = 01 */
STM32L_GPIO_PUPDR_OFF(g->port) |= 0x55555555 & mask2;
val |= 0x55555555 & mask2;
else if (g->flags & GPIO_PULL_DOWN) /* Pull Down = 10 */
STM32L_GPIO_PUPDR_OFF(g->port) |= 0xaaaaaaaa & mask2;
val |= 0xaaaaaaaa & mask2;
STM32L_GPIO_PUPDR_OFF(g->port) = val;
if (g->flags & GPIO_OPEN_DRAIN)
STM32L_GPIO_OTYPER_OFF(g->port) |= g->mask;
@@ -47,11 +49,13 @@ int gpio_pre_init(void)
* potential damage, e.g. driving an open-drain output
* high before it has been configured as such.
*/
val = STM32L_GPIO_MODER_OFF(g->port) & ~mask2;
if (g->flags & GPIO_OUTPUT) { /* General purpose, MODE = 01 */
STM32L_GPIO_MODER_OFF(g->port) |= 0x55555555 & mask2;
val |= 0x55555555 & mask2;
STM32L_GPIO_MODER_OFF(g->port) = val;
gpio_set_level(i, g->flags & GPIO_HIGH);
} else if (g->flags & GPIO_INPUT) {
STM32L_GPIO_MODER_OFF(g->port) &= ~mask2;
} else if (g->flags & GPIO_INPUT) { /* Input, MODE=00 */
STM32L_GPIO_MODER_OFF(g->port) = val;
}
/* Set up interrupts if necessary */