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ulp-riscv-i2c: Add ULP RISC-V I2C read/write timeout config option

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The commit 88e4c06028 introduced a loop timeout for all ULP RISC-V I2C
transactions to avoid getting stuck in a forever loop. The loop timeout
was set to 500 msec by default. This commit improves on the concept by
making the loop timeout configurable via a Kconfig option in terms of
CPU ticks. If the timeout is set to -1 value then the transaction loops
will never timeout, therefore restoring the driver behavior before the
timeout was introduced.

The commit also updates the I2C Fast mode timings for esp32s2 which need
to be adjusted due to bus timing constraints.

Closes https://github.com/espressif/esp-idf/issues/11154
This commit is contained in:
Sudeep Mohanty
2023-04-26 11:19:18 +02:00
parent 5a353ab1ca
commit 08600cb1a3
4 changed files with 61 additions and 35 deletions
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13
components/ulp/ulp_riscv/include/ulp_riscv_i2c.h
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@@ -52,6 +52,7 @@ typedef struct {
.i2c_pin_cfg.sda_pullup_en = true, \
.i2c_pin_cfg.scl_pullup_en = true, \
#if CONFIG_IDF_TARGET_ESP32S3
/* Nominal I2C bus timing parameters for I2C fast mode. Max SCL freq of 400 KHz. */
#define ULP_RISCV_I2C_FAST_MODE_CONFIG() \
.i2c_timing_cfg.scl_low_period = 1.4, \
@@ -59,7 +60,17 @@ typedef struct {
.i2c_timing_cfg.sda_duty_period = 1, \
.i2c_timing_cfg.scl_start_period = 2, \
.i2c_timing_cfg.scl_stop_period = 1.3, \
.i2c_timing_cfg.i2c_trans_timeout = 20, \
.i2c_timing_cfg.i2c_trans_timeout = 20,
#elif CONFIG_IDF_TARGET_ESP32S2
/* Nominal I2C bus timing parameters for I2C fast mode. Max SCL freq on S2 is about 233 KHz due to timing constraints. */
#define ULP_RISCV_I2C_FAST_MODE_CONFIG() \
.i2c_timing_cfg.scl_low_period = 2, \
.i2c_timing_cfg.scl_high_period = 0.7, \
.i2c_timing_cfg.sda_duty_period = 1.7, \
.i2c_timing_cfg.scl_start_period = 2.4, \
.i2c_timing_cfg.scl_stop_period = 1.3, \
.i2c_timing_cfg.i2c_trans_timeout = 20,
#endif
/* Nominal I2C bus timing parameters for I2C standard mode. Max SCL freq of 100 KHz. */
#define ULP_RISCV_I2C_STANDARD_MODE_CONFIG() \