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Move touch ADC data collection to M0.

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...so it continues when M4 is shut down.

It's not as pretty as using DMA, but it's far simpler, even if it involves letting the ADC run continuously and taking the last samples even if not synchronizing to the phase of the sampling of the channels.
This commit is contained in:
Jared Boone 2016-07-24 15:31:53 -07:00
parent b3f4ea8978
commit 8b02e40602
5 changed files with 10 additions and 36 deletions
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27
firmware/application/touch_adc.cpp
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@ -70,26 +70,15 @@ void start() {
// static constexpr bool monitor_overruns_and_not_dones = false;
Samples get() {
const auto& frame = shared_memory.touch_adc_frame;
const auto xp = frame.dr[portapack::adc0_touch_xp_input];
const auto xn = frame.dr[portapack::adc0_touch_xn_input];
const auto yp = frame.dr[portapack::adc0_touch_yp_input];
const auto yn = frame.dr[portapack::adc0_touch_yn_input];
// if( monitor_overruns_and_not_dones ) {
// const auto dr_and = xp & xn & yp & yn;
// const auto dr_or = xp | xn | yp | yn;
// const bool done = (dr_and >> 31) & 1;
// const bool overrun = (dr_or >> 30) & 1;
// led_tx.write(overrun);
// led_rx.write(!done);
// }
const auto xp_reg = LPC_ADC0->DR[portapack::adc0_touch_xp_input];
const auto xn_reg = LPC_ADC0->DR[portapack::adc0_touch_xn_input];
const auto yp_reg = LPC_ADC0->DR[portapack::adc0_touch_yp_input];
const auto yn_reg = LPC_ADC0->DR[portapack::adc0_touch_yn_input];
return {
(xp >> 6) & 0x3ff,
(xn >> 6) & 0x3ff,
(yp >> 6) & 0x3ff,
(yn >> 6) & 0x3ff,
(xp_reg >> 6) & 0x3ff,
(xn_reg >> 6) & 0x3ff,
(yp_reg >> 6) & 0x3ff,
(yn_reg >> 6) & 0x3ff,
};
}