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stm32: add analog GPIO configuration

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Allow to setup a GPIO pin in analog mode on STM32 chips.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BRANCH=none
BUG=none
TEST=run comparators with GPIOs in analog mode on STM32L151 and
STM32F072.

Change-Id: Ie11dd8711e39ab191c96478c6d8c7b7e0dfa7ea4
Reviewed-on: https://chromium-review.googlesource.com/189863
Reviewed-by: Vic Yang <victoryang@chromium.org>
Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>
This commit is contained in:
Vincent Palatin
2014-02-21 16:59:58 -08:00
committed by chrome-internal-fetch
parent defaf5cdb5
commit 6472ce964d
3 changed files with 12 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
chip/stm32/gpio-stm32f.c
View File

@@ -81,7 +81,10 @@ void gpio_set_flags_by_mask(uint32_t port, uint32_t pmask, uint32_t flags)
* GPIOx_ODR determines which resistor to activate in
* input mode, see Table 16 (datasheet rm0041)
*/
if (flags & GPIO_PULL_UP) {
if (flags & GPIO_ANALOG) {
/* Analog input, MODE=00 CNF=00 */
/* the 4 bits in mask are already reset above */
} else if (flags & GPIO_PULL_UP) {
mask |= 0x88888888 & cnf;
STM32_GPIO_BSRR(port) = pmask;
} else if (flags & GPIO_PULL_DOWN) {

4
chip/stm32/gpio-stm32f0.c
View File

@@ -67,6 +67,10 @@ void gpio_set_flags_by_mask(uint32_t port, uint32_t mask, uint32_t flags)
val |= 0x55555555 & mask2;
STM32_GPIO_MODER(port) = val;
} else if (flags & GPIO_ANALOG) {
/* Analog, MODE=11 */
val |= 0xFFFFFFFF & mask2;
STM32_GPIO_MODER(port) = val;
} else if (flags & GPIO_INPUT) {
/* Input, MODE=00 */
STM32_GPIO_MODER(port) = val;

4
chip/stm32/gpio-stm32l.c
View File

@@ -67,6 +67,10 @@ void gpio_set_flags_by_mask(uint32_t port, uint32_t mask, uint32_t flags)
val |= 0x55555555 & mask2;
STM32_GPIO_MODER(port) = val;
} else if (flags & GPIO_ANALOG) {
/* Analog, MODE=11 */
val |= 0xFFFFFFFF & mask2;
STM32_GPIO_MODER(port) = val;
} else if (flags & GPIO_INPUT) {
/* Input, MODE=00 */
STM32_GPIO_MODER(port) = val;