esp32/i2c: Use idf function for calculating main timeout.

Signed-off-by: Andrew Leech <[email protected]>
andrewleech · Sep 15, 2024 · 236ba17 · 236ba17
1 parent 54b44fe
commit 236ba17
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/ports/esp32/machine_i2c.c b/ports/esp32/machine_i2c.c
@@ -59,6 +59,8 @@
 
 #define I2C_DEFAULT_TIMEOUT_US (50000) // 50ms
 
+// this formula computes the log2 of "m"
+#define BITS_TO_LOG2(m) ((m) - 1) / (((m) - 1) % 255 + 1) / 255 % 255 * 8 + 7 - 86 / (((m) - 1) % 255 + 12)
 typedef struct _machine_hw_i2c_obj_t {
     mp_obj_base_t base;
     i2c_port_t port : 8;
@@ -81,12 +83,12 @@ static void machine_hw_i2c_init(machine_hw_i2c_obj_t *self, uint32_t freq, uint3
         .master.clk_speed = freq,
     };
     i2c_param_config(self->port, &conf);
-    
+
     TickType_t ticks_to_wait = (xfer_timeout_ms == -1) ? portMAX_DELAY : pdMS_TO_TICKS(xfer_timeout_ms);
     if (xSemaphoreTake(bus_handle->bus_lock_mux, ticks_to_wait) != pdTRUE) {
         return ESP_ERR_TIMEOUT;
     }
-    
+
     int timeout = I2C_SCLK_FREQ / 1000000 * timeout_us;
     i2c_set_timeout(self->port, (timeout > I2C_LL_MAX_TIMEOUT) ? I2C_LL_MAX_TIMEOUT : timeout);
     i2c_driver_install(self->port, I2C_MODE_MASTER, 0, 0, 0);