I wanted to use the WaveDAC8 component with different waveforms than originally configured. To do this, the user needs to use the WaveDAC8_StartEx() function.
Issue:
I thought that I could straight-out replace the WaveDAC8_Start() with WaveDAC8_StartEx(wave1_ptr, wave1_sz, wave2_ptr, wave2_sz).
// WaveDAC8_Start(); /* Start WaveDAC8 */
WaveDAC8_StartEx(&WaveDAC8_wave1[WaveDAC8_WAVE1_LENGTH/2], WaveDAC8_WAVE1_LENGTH/2, WaveDAC8_wave2, WaveDAC8_WAVE2_LENGTH); /* Start WaveDAC8 */
This does not work! The originally configured waveforms are used not the 'new' defined waveforms.
What does work as to execute the WaveDAC8_Start() first then WaveDAC8_StartEx() next :
WaveDAC8_Start(); /* Start WaveDAC8 */
WaveDAC8_Stop(); /* Stop before executing WaveDAC8_StartEx() */
WaveDAC8_StartEx(&WaveDAC8_2_wave1[WaveDAC8_2_WAVE1_LENGTH/2], WaveDAC8_2_WAVE1_LENGTH/2, WaveDAC8_2_wave2, WaveDAC8_2_WAVE2_LENGTH); /* Start WaveDAC8 */
Reason:
This is because the WaveDAC8_StartEx() function is code as follows:
void WaveDAC8_StartEx(const uint8 * wavePtr1, uint16 sampleSize1, const uint8 * wavePtr2, uint16 sampleSize2)
{
WaveDAC8_Wave1Setup(wavePtr1, sampleSize1);
WaveDAC8_Wave2Setup(wavePtr2, sampleSize2);
WaveDAC8_Start(); /* This Start() initializes with the original configuration waveforms if not previously initialized */
}
The datasheet only mentions about Stopping the WaveDAC8 before executing WaveDAC8_StartEx(). It makes NO mention about the WaveDAC8 being previously initialized.
Len
Len
"Engineering is an Art. The Art of Compromise."
