73 lines
2.3 KiB
C++
73 lines
2.3 KiB
C++
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#include "cdc_class.h"
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#include "adcdma.h"
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#include "oneway.h"
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/** Test ADC.
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* Jednoduchý test ADC převodníku se vzorkovací frekvencí 1kHz.
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* Data se čtou na PA2 a vypisují pomocí USB_CDC v hex formátu.
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* Převodník je lehce přetaktovaný (18 MHz místo max.14), ale
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* zřejmě to moc nevadí. Žádný závěr o kvalitě se z toho dělat
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* nedá, šum může být způsoben vývojovou deskou, linearitu nemám
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* jak měřit (resp. mě to nebaví).
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* */
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class Transport : public BaseLayer, public OneWay {
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static constexpr const char * hexStr = "0123456789abcdef";
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static constexpr const char * eol = "\r\n ";
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static constexpr unsigned max = 128;
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static_assert (max > 4u * HALF_LEN + 4u, "buffer len is too small");
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GpioClass led; // indikace DMA
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volatile bool toggle;
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FIFO<char, max> ring;
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char buffer [max];
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public:
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explicit Transport () noexcept : BaseLayer(), OneWay(),
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led(GPIOA, 1), toggle(false), ring() {}
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// Toto je voláno v přerušení DMA1_Channel1_IRQHandler od ADC.
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unsigned int Send(uint16_t * const ptr, const unsigned int len) override {
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led << toggle; // indikace
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toggle = ! toggle;
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for (unsigned n=0u; n<len; n++) { // pro test vypisuji v hexu
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put_u16 (ptr [n]);
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}
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for (unsigned n=0u; n<2u; n++) ring.Write(eol [n]); // new line
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return len;
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}
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void pass () {
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unsigned n = 0u;
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for (n=0u; n<max; n++) {
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if (!ring.Read (buffer [n])) break;
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}
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if (n) block (n);
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}
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void put_u16 (const uint16_t p) {
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uint16_t e = p; // max 0xFFF (12 bit)
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const char c1 = hexStr [e & 0x0f]; e >>= 4;
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const char c2 = hexStr [e & 0x0f]; e >>= 4;
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const char c3 = hexStr [e & 0x0f];
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ring.Write (c3);
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ring.Write (c2);
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ring.Write (c1);
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ring.Write (eol [2]); // space
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}
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protected:
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void block (const unsigned len) {
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unsigned ofs = 0u, rem = len;
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while (rem) {
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const unsigned res = Down (buffer + ofs, rem);
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rem -= res;
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ofs += res;
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}
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}
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};
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static cdc_class cdc;
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static AdcDma adc;
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static Transport tra;
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int main () {
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cdc.init();
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tra += cdc;
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adc.attach(tra);
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for (;;) {
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tra.pass();
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}
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return 0;
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}
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