fix type bug

encoder/encoder.c

@@ -45,7 +45,7 @@ rt_err_t encoder_disable(encoder_t enc)
     return enc->disable(enc);
 }
 
-rt_int16_t encoder_read(encoder_t enc)
+rt_int32_t encoder_read(encoder_t enc)
 {
     RT_ASSERT(enc != RT_NULL);
 

encoder/encoder.h

@@ -35,7 +35,7 @@ rt_err_t        encoder_reset(encoder_t enc);
 rt_err_t        encoder_set_sample_time(encoder_t enc, rt_uint16_t sample_time);    /* set sample time */
 
 /** rpm = pulse_count / sample_time(ms) / pulse_revol * 1000 * 60 **/
-rt_int16_t      encoder_read(encoder_t enc);                                        /* return pulse_count */
+rt_int32_t      encoder_read(encoder_t enc);                                        /* return pulse_count */
 rt_int16_t      encoder_measure_cps(encoder_t enc);                                 /* pulse_count per second */
 rt_int16_t      encoder_measure_rpm(encoder_t enc);                                 /* revolutions per minute */