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Fix I2C clock stretching issue with ESP32 (#5910)

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It was found that when I2C device is holding the clock LOW, ESP32 master is failing to wait for the clock to be released.

Fixes: #5875
Fixes: sparkfun/SparkFun_u-blox_GNSS_Arduino_Library#77
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Me No Dev 2021-11-19 18:43:59 +02:00 committed by GitHub
parent bd2be80b54
commit c9916c463f
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2 changed files with 4 additions and 1 deletions
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2
cores/esp32/esp32-hal-i2c-slave.c
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@ -302,7 +302,7 @@ esp_err_t i2cSlaveInit(uint8_t num, int sda, int scl, uint16_t slaveID, uint32_t
i2c_ll_slave_init(i2c->dev);
i2c_ll_set_fifo_mode(i2c->dev, true);
i2c_ll_set_slave_addr(i2c->dev, slaveID, false);
i2c_ll_set_tout(i2c->dev, 32000);
i2c_ll_set_tout(i2c->dev, I2C_LL_MAX_TIMEOUT);
i2c_slave_set_frequency(i2c, frequency);
if (!i2c_slave_check_line_state(sda, scl)) {

3
cores/esp32/esp32-hal-i2c.c
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@ -24,6 +24,7 @@
#include "soc/soc_caps.h"
#include "soc/i2c_periph.h"
#include "hal/i2c_hal.h"
#include "hal/i2c_ll.h"
#include "driver/i2c.h"
typedef volatile struct {
@ -91,6 +92,8 @@ esp_err_t i2cInit(uint8_t i2c_num, int8_t sda, int8_t scl, uint32_t frequency){
} else {
bus[i2c_num].initialized = true;
bus[i2c_num].frequency = frequency;
//Clock Stretching Timeout: 20b:esp32, 5b:esp32-c3, 24b:esp32-s2
i2c_set_timeout((i2c_port_t)i2c_num, I2C_LL_MAX_TIMEOUT);
}
}
#if !CONFIG_DISABLE_HAL_LOCKS