67 lines
1.8 KiB
C++
67 lines
1.8 KiB
C++
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#include "system.h"
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#include "spiblocked.h"
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enum SPICLK : uint32_t {
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FPCLK_2 = 0u, // 72 MHz
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FPCLK_4, // 36 MHz
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FPCLK_8, // 18 MHz
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FPCLK_16, // 9 MHz
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FPCLK_32, // 4.5 MHz
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FPCLK_64, // 2.25 MHz
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FPCLK_128, // 1.125 MHz
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FPCLK_256, // 0.5625 MHz
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};
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static constexpr unsigned FM = 3u; // 50 MHz
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static void InitPins () noexcept {
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// PA4 - NSS, PA5 - SCK, PA6 - MISO, PA7 - MOSI
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GPIOA.CFGLR.modify([](GPIOA_Type::CFGLR_DEF & r) -> uint32_t {
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r.B.MODE4 = FM;
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r.B.CNF4 = 0u; // gen push - pull
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r.B.MODE5 = FM;
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r.B.CNF5 = 2u; // alt push - pull
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r.B.MODE6 = 0u; // input mode
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r.B.CNF6 = 1u; // floating
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r.B.MODE7 = FM;
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r.B.CNF7 = 2u; // alt push - pull
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return r.R;
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});
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// AFIO - default
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GPIOA.BSHR.B.BS4 = SET;
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}
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SpiBlocked::SpiBlocked() noexcept {
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RCC.APB2PCENR.modify([](RCC_Type::APB2PCENR_DEF & r) -> uint32_t {
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r.B.SPI1EN = SET;
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r.B.IOPAEN = SET;
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//r.B.AFIOEN = SET;
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return r.R;
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});
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InitPins();
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RCC.APB2PRSTR.B.SPI1RST = SET;
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RCC.APB2PRSTR.B.SPI1RST = RESET;
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SPI1.CTLR1.modify([](SPI1_Type::CTLR1_DEF & r) -> uint32_t {
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r.B.CPHA = RESET;
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r.B.CPOL = RESET;
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r.B.MSTR = SET; // master
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r.B.DFF = RESET; // 8 bit
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r.B.SSM = SET; // software
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r.B.SSI = SET; // !!! netuším proč, ale jinak se nenastaví MSTR a SPE
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r.B.LSBFIRST = RESET;
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r.B.BR = FPCLK_64;
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return r.R;
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});
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SPI1.CRCR.R = 7u;
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SPI1.CTLR1.B.SPE = SET;
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}
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uint8_t SpiBlocked::ReadWriteByte(const uint8_t data) {
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while (SPI1.STATR.B.TXE == RESET);
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SPI1.DATAR.B.DATAR = data;
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while (SPI1.STATR.B.RXNE == RESET);
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return SPI1.DATAR.B.DATAR;
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}
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void SpiBlocked::ChipSelect(const bool on) {
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if (on) GPIOA.BSHR.B.BR4 = SET;
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else GPIOA.BSHR.B.BS4 = SET;
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}
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