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Fix I2C clock stretching issue with ESP32 #5910

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Merged
merged 1 commit into from
Nov 19, 2021
Merged

Fix I2C clock stretching issue with ESP32 #5910

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2 changes: 1 addition & 1 deletion cores/esp32/esp32-hal-i2c-slave.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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)) {
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3 changes: 3 additions & 0 deletions cores/esp32/esp32-hal-i2c.c
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Expand Up @@ -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 {
Expand Down Expand Up @@ -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
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