Function Generator Using DAC8

1 Description

This DAC8 function generator subsystem example shows how to implement a basic function generator to output a sine wave using the integrated DAC8, a timer triggered DMA, and an OPAx module. A 256-point sine wave data table written in the code is loaded to the DAC8 about every 40μs using a timer to trigger the DMA transfers. This generates an approximate 98Hz, 256-point sine wave. The OPA is used to buffer the DAC output and route the signal to an external pin, PA22 (OPA0_Out).

MSPM0G3507, MSPM0L1306 DAC8 Function Generator Block
Diagram

Figure 1-1 DAC8 Function Generator Block Diagram

2 Required Peripherals

Table 2-1 describes the required integrated peripherals.

Table 2-1 Required Peripherals

Subblock Functionality	Peripheral Use	Notes
DAC8	1 × COMP	Shown as `COMP_0_INST` in code
DMA	1 × DMA Channel	Shown as `DMA_CH0` in code
Buffer	1 × OPA	Shown as `OPA_0_INST` in code
Timer	1 × TIMG	Shown as `TIMER_0_INST` in code

3 Compatible Devices

Based on the requirements shown in Table 2-1, the example code is compatible with the devices shown in
Table 3-1.

Table 3-1 Compatible Devices

Compatible Devices	EVM
MSPM0L13x	LP-MSPM0L1306
MSPM0Gx	LP-MSPM0G3507
MSPM0Lx22x	LP-MSPM0L2228