I2C Timeout "Fix" for Espressif devices.

litui · litui · commit 2f203e2d70b9 · 2023-03-25T15:19:01.000-06:00
- Similar code has been tested in ESP-IDF
- May not be applicable to all use cases or hardware configurations, but is working under my own use cases on Adafruit "Huzzah32" Feather, Sparkfun Thing Plus C, and Unexpected Maker FeatherS3 boards
diff --git a/ports/espressif/peripherals/i2c.c b/ports/espressif/peripherals/i2c.c
@@ -58,7 +58,16 @@ esp_err_t peripherals_i2c_init(i2c_port_t num, const i2c_config_t *i2c_conf) {
         rx_buf_len = 256;
         tx_buf_len = 256;
     }
-    return i2c_driver_install(num, i2c_conf->mode, rx_buf_len, tx_buf_len, 0);
+    err = i2c_driver_install(num, i2c_conf->mode, rx_buf_len, tx_buf_len, 0);
+    if (err != ESP_OK) {
+        return err;
+    }
+    #if ESPRESSIF_I2C_SET_TIMEOUT_PERCENT_OF_MAX
+        int max_timeout = (ESP32_I2C_TIMEOUT_MAX + 1) * ESPRESSIF_I2C_SET_TIMEOUT_PERCENT_OF_MAX / 100;
+        err = i2c_set_timeout(num, max_timeout);
+    #endif
+
+    return err;
 }
 
 void peripherals_i2c_deinit(i2c_port_t num) {
diff --git a/ports/espressif/peripherals/i2c.h b/ports/espressif/peripherals/i2c.h
@@ -29,6 +29,22 @@
 
 #include "driver/i2c.h"
 
+#ifndef ESPRESSIF_I2C_SET_TIMEOUT_PERCENT_OF_MAX
+#define ESPRESSIF_I2C_SET_TIMEOUT_PERCENT_OF_MAX 66
+#endif
+
+#if ESPRESSIF_I2C_SET_TIMEOUT_PERCENT_OF_MAX
+#include "soc/i2c_reg.h"
+// Determine size of memory location used to store timeout.
+#if defined(I2C_TIME_OUT_REG_M)  // Standard on ESP32
+    #define ESP32_I2C_TIMEOUT_MAX I2C_TIME_OUT_REG_M
+#elif defined(I2C_TIME_OUT_VALUE_M)  // ESP32 S3, possibly others.
+    #define ESP32_I2C_TIMEOUT_MAX I2C_TIME_OUT_VALUE_M
+#else
+    #define ESP32_I2C_TIMEOUT_MAX 1048576;  // Assume same values as basic ESP32.
+#endif // defined(I2C_TIME_OUT_REG_M)
+#endif // ESPRESSIF_I2C_SET_TIMEOUT_PERCENT_OF_MAX
+
 extern void i2c_reset(void);
 extern void never_reset_i2c(i2c_port_t num);
 extern esp_err_t peripherals_i2c_init(i2c_port_t num, const i2c_config_t *i2c_conf);
