API change to remove dual loading default case for dac_load_data_buffer_single

Also change dac_data from u32 to u16

include/libopencm3/stm32/common/dac_common_all.h

@@ -401,8 +401,8 @@ void dac_set_trigger_source(u32 dac_trig_src);
 void dac_set_waveform_generation(u32 dac_wave_ens);
 void dac_disable_waveform_generation(data_channel dac_channel);
 void dac_set_waveform_characteristics(u32 dac_mamp);
-void dac_load_data_buffer_single(u32 dac_data, data_align dac_data_format, data_channel dac_channel);
-void dac_load_data_buffer_dual(u32 dac_data1, u32 dac_data2, data_align dac_data_format);
+void dac_load_data_buffer_single(u16 dac_data, data_align dac_data_format, data_channel dac_channel);
+void dac_load_data_buffer_dual(u16 dac_data1, u16 dac_data2, data_align dac_data_format);
 void dac_software_trigger(data_channel dac_channel);
 
 END_DECLS

lib/stm32/common/dac_common_all.c

@@ -402,18 +402,12 @@ data to be converted on a channel. The data can be aligned as follows:
 @li right-aligned 12 bit data in bits 0-11
 @li left aligned 12 bit data in bits 4-15
 
-This function can also be used to load the dual channel registers if the data is
-formatted according to the datasheets:
-@li right-aligned 8 bit data in bits 0-7 for channel 1 and 8-15 for channel 2
-@li right-aligned 12 bit data in bits 0-11 for channel 1 and 16-27 for channel 2
-@li left aligned 12 bit data in bits 4-15 for channel 1 and 20-31 for channel 2
-
-@param[in] dac_data u32 with appropriate alignment.
+@param[in] dac_data u16 with appropriate alignment.
 @param[in] dac_data_format enum ::data_align. Alignment and size.
 @param[in] dac_channel enum ::data_channel.
 */
 
-void dac_load_data_buffer_single(u32 dac_data, data_align dac_data_format, data_channel dac_channel)
+void dac_load_data_buffer_single(u16 dac_data, data_align dac_data_format, data_channel dac_channel)
 {
 	if (dac_channel == CHANNEL_1)
 	{
@@ -443,18 +437,6 @@ void dac_load_data_buffer_single(u32 dac_data, data_align dac_data_format, data_
 			break;
 		}
 	}
-	else
-		switch (dac_data_format) {
-		case RIGHT8:
-			DAC_DHR8RD = dac_data;
-			break;
-		case RIGHT12:
-			DAC_DHR12RD = dac_data;
-			break;
-		case LEFT12:
-			DAC_DHR12LD = dac_data;
-			break;
-		}
 }
 
 /*-----------------------------------------------------------------------------*/
@@ -465,12 +447,12 @@ Loads the appropriate digital to analog converter dual data register with 12 or
 simultaneous or independent analog output. The data in both channels are aligned
 identically.
 
-@param[in] dac_data1 u32 for channel 1 with appropriate alignment.
-@param[in] dac_data2 u32 for channel 2 with appropriate alignment.
+@param[in] dac_data1 u16 for channel 1 with appropriate alignment.
+@param[in] dac_data2 u16 for channel 2 with appropriate alignment.
 @param[in] dac_data_format enum ::data_align. Right or left aligned, and 8 or 12 bit.
 */
 
-void dac_load_data_buffer_dual(u32 dac_data1, u32 dac_data2, data_align dac_data_format)
+void dac_load_data_buffer_dual(u16 dac_data1, u16 dac_data2, data_align dac_data_format)
 {
 	switch (dac_data_format) {
 	case RIGHT8: