For the STM32L476-Discovery board, the following peripheral assignments are used:

Pin	Peripheral	Use
PA5	DAC Channel 2	Primary (Mono or Stereo) output channel
	DAC Channel 1	Stereo output channel
	DMA2 Channel 5	Used to move samples from a buffer to the DAC(s).
PA3	OPAMP1	Used to buffer DAC Channel 1 to drive an output pin.
	TIMER 4	Used to trigger ADC1 and DACs.
PA3	ADC1	Primary (Mono or Stereo) input channel.
PA2	ADC2	Stereo input channel.
	DMA1 Channel 1	Used to move samples from the ADC(s) to a buffer.
	USART2	Serial Communication to a host terminal

- DMA2 Channel 5 is triggered by DAC2 using request 3
- DMA1 Channel 1  is triggered by ADC1 using request 0
- ADC2 is a slave to ADC1 in dual sampling mode (Stereo input case)

DMA1 Channel 1 data is moved into an internal buffer of size ADC_Buffer_Size. Interrupts from DMA1 CHannel 1 are generated when the buffer is half-full and full, indicating that the user may process one-half of the samples, while the other half is being filled. getblocksize() returns a value of ADC_Block_Size, which is actually half of the size of the actual DMA buffer (indicating the amount of data free to be processed in each sample block).

ADC inputs and DAC output are accessed via the P1 connector on the STM32L476G-Discovery board. Pin assignments are as follows:

P1 Pin	P1 Label	ECE 486 Function
1	3V3	Power (3.3~V)
2	GND	Ground
3	2V5	Power (2.5~V)
4	GND	Ground
5	3V	Power (3~V)
6	BOOT0	-
7	PB3	3V3_REG_ON: Tied to 3.3V Regulator via 4.7kohm
8	PB2	Red LED
9	PE8	Green LED
10	PA0	GPIO Input: Connected to Joystic ``center"
11	PA5	Primary DAC Output(MONO and STEREO)
12	PA1	Primary ADC Input (MONO and STEREO)
13	PA2	Second ADC Input (STEREO only)
14	PA3	Second DAC Output via Opamp (STEREO only)
15	PB6	I2C1_SCL
16	PB7	I2C1_SDA
17	PD0	EXT_RST: Configured as GPIO Digital Output
18	NC	-
19	GND	Ground
20	GND	Ground