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I2C driver docs (#4298)

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* I2C driver docs

- Added I2C driver docs.
- Changed arm master i2c driver to have a weak i2c_init as it is impossible to account for all possible port configuration in the STM32 world.

* Update docs/i2c_driver.md

Co-Authored-By: yiancar <yiangosyiangou@cytanet.com.cy>

* Update docs/i2c_driver.md

Co-Authored-By: yiancar <yiangosyiangou@cytanet.com.cy>

* Update docs/i2c_driver.md

Co-Authored-By: yiancar <yiangosyiangou@cytanet.com.cy>

* Update docs/i2c_driver.md

Co-Authored-By: yiancar <yiangosyiangou@cytanet.com.cy>

* GPIO release fix
This commit is contained in:
yiancar 2018-11-10 12:26:39 -08:00 • committed by Jack Humbert
parent 3ba242cc3f
commit 4083614023
4 changed files with 89 additions and 1 deletions
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5
drivers/arm/i2c_master.c
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@ -26,6 +26,7 @@
*/
#include "i2c_master.h"
#include "quantum.h"
#include <string.h>
#include <hal.h>
@ -41,9 +42,11 @@ static const I2CConfig i2cconfig = {
0
};
__attribute__ ((weak))
void i2c_init(void)
{
palSetGroupMode(GPIOB, GPIOB_PIN6 | GPIOB_PIN7, 0, PAL_MODE_INPUT); // Try releasing special pins for a short time
setPinInput(B6); // Try releasing special pins for a short time
setPinInput(B7);
chThdSleepMilliseconds(10);
palSetPadMode(GPIOB, 6, PAL_MODE_ALTERNATE(4) | PAL_STM32_OTYPE_OPENDRAIN | PAL_STM32_PUPDR_PULLUP);