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Merge pull request #13412 from jue89/feature/cryptoauthlib-gpio-wake

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pkg/cryptoauthlib: wake pulse implementation for CPUs supporting periph_i2c_reconfigure
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benpicco 2020-05-07 16:34:44 +02:00 committed by GitHub
commit 7037c95b44
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2 changed files with 16 additions and 0 deletions
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1
pkg/cryptoauthlib/Makefile.dep
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@ -1,4 +1,5 @@
USEMODULE += xtimer
FEATURES_REQUIRED += periph_i2c
FEATURES_OPTIONAL += periph_i2c_reconfigure
DEFAULT_MODULE += auto_init_security
USEMODULE += cryptoauthlib_contrib

15
pkg/cryptoauthlib/contrib/atca.c
View File

@ -146,9 +146,24 @@ ATCA_STATUS hal_i2c_wake(ATCAIface iface)
ATCAIfaceCfg *cfg = atgetifacecfg(iface);
uint8_t data[4] = { 0 };
#if IS_USED(MODULE_PERIPH_I2C_RECONFIGURE)
/* switch I2C peripheral to GPIO function */
i2c_deinit_pins(cfg->atcai2c.bus);
gpio_init(i2c_pin_sda(cfg->atcai2c.bus), GPIO_OUT);
/* send wake pulse of 100us (t_WOL) */
gpio_clear(i2c_pin_sda(cfg->atcai2c.bus));
atca_delay_us(100);
/* reinit I2C peripheral */
i2c_init_pins(cfg->atcai2c.bus);
#else
/* send wake pulse by sending byte 0x00 */
/* this requires the I2C clock to be 100kHz at a max */
i2c_acquire(cfg->atcai2c.bus);
i2c_write_byte(cfg->atcai2c.bus, ATCA_WAKE_ADDR, data[0], 0);
i2c_release(cfg->atcai2c.bus);
#endif
atca_delay_us(cfg->wake_delay);