Update VS1003_STM.cpp

stevstrong · stevstrong · commit 069fa0f0347a · 2025-03-22T15:54:30.000+01:00
fix sdi_send_zeros()
diff --git a/STM32F1/libraries/Serasidis_VS1003B_STM/src/VS1003_STM.cpp b/STM32F1/libraries/Serasidis_VS1003B_STM/src/VS1003_STM.cpp
@@ -159,8 +159,10 @@ void VS1003::sdi_send_zeroes(size_t len)
     data_mode_on();
     size_t chunk_length = min(len,vs1003_chunk_size);
     len -= chunk_length;
-    while (chunk_length--)
-      my_SPI->transfer(0);
+    // DO NOT optimize these lines !!! There must be a 1us delay between bytes
+    do {
+      my_SPI->write(0);
+    } while (--chunk_length);
     data_mode_off();
   }
 }

Original file line number	Diff line number	Diff line change
`@@ -159,8 +159,10 @@ void VS1003::sdi_send_zeroes(size_t len)`
`159`	`159`	`data_mode_on();`
`160`	`160`	`size_t chunk_length = min(len,vs1003_chunk_size);`
`161`	`161`	`len -= chunk_length;`
`162`		`- while (chunk_length--)`
`163`		`- my_SPI->transfer(0);`
	`162`	`+ // DO NOT optimize these lines !!! There must be a 1us delay between bytes`
	`163`	`+ do {`
	`164`	`+ my_SPI->write(0);`
	`165`	`+ } while (--chunk_length);`
`164`	`166`	`data_mode_off();`
`165`	`167`	`}`
`166`	`168`	`}`