mirror of https://github.com/esphome/esphome.git
240 lines
8.3 KiB
C++
240 lines
8.3 KiB
C++
#include "spi.h"
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#include "esphome/core/log.h"
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#include "esphome/core/helpers.h"
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#include "esphome/core/application.h"
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namespace esphome {
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namespace spi {
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static const char *const TAG = "spi";
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void IRAM_ATTR HOT SPIComponent::disable() {
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#ifdef USE_SPI_ARDUINO_BACKEND
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if (this->hw_spi_ != nullptr) {
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this->hw_spi_->endTransaction();
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}
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#endif // USE_SPI_ARDUINO_BACKEND
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if (this->active_cs_) {
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this->active_cs_->digital_write(true);
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this->active_cs_ = nullptr;
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}
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}
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void SPIComponent::setup() {
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ESP_LOGCONFIG(TAG, "Setting up SPI bus...");
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this->clk_->setup();
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this->clk_->digital_write(true);
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#ifdef USE_SPI_ARDUINO_BACKEND
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bool use_hw_spi = true;
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const bool has_miso = this->miso_ != nullptr;
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const bool has_mosi = this->mosi_ != nullptr;
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int8_t clk_pin = -1, miso_pin = -1, mosi_pin = -1;
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if (!this->clk_->is_internal())
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use_hw_spi = false;
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if (has_miso && !miso_->is_internal())
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use_hw_spi = false;
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if (has_mosi && !mosi_->is_internal())
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use_hw_spi = false;
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if (use_hw_spi) {
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auto *clk_internal = (InternalGPIOPin *) clk_;
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auto *miso_internal = (InternalGPIOPin *) miso_;
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auto *mosi_internal = (InternalGPIOPin *) mosi_;
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if (clk_internal->is_inverted())
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use_hw_spi = false;
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if (has_miso && miso_internal->is_inverted())
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use_hw_spi = false;
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if (has_mosi && mosi_internal->is_inverted())
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use_hw_spi = false;
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if (use_hw_spi) {
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clk_pin = clk_internal->get_pin();
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miso_pin = has_miso ? miso_internal->get_pin() : -1;
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mosi_pin = has_mosi ? mosi_internal->get_pin() : -1;
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}
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}
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#ifdef USE_ESP8266
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if (!(clk_pin == 6 && miso_pin == 7 && mosi_pin == 8) &&
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!(clk_pin == 14 && (!has_miso || miso_pin == 12) && (!has_mosi || mosi_pin == 13)))
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use_hw_spi = false;
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if (use_hw_spi) {
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this->hw_spi_ = &SPI;
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this->hw_spi_->pins(clk_pin, miso_pin, mosi_pin, 0);
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this->hw_spi_->begin();
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return;
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}
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#endif // USE_ESP8266
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#ifdef USE_ESP32
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static uint8_t spi_bus_num = 0;
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if (spi_bus_num >= 2) {
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use_hw_spi = false;
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}
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if (use_hw_spi) {
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if (spi_bus_num == 0) {
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this->hw_spi_ = &SPI;
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} else {
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this->hw_spi_ = new SPIClass(VSPI); // NOLINT(cppcoreguidelines-owning-memory)
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}
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spi_bus_num++;
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this->hw_spi_->begin(clk_pin, miso_pin, mosi_pin);
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return;
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}
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#endif // USE_ESP32
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#endif // USE_SPI_ARDUINO_BACKEND
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if (this->miso_ != nullptr) {
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this->miso_->setup();
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}
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if (this->mosi_ != nullptr) {
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this->mosi_->setup();
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this->mosi_->digital_write(false);
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}
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}
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void SPIComponent::dump_config() {
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ESP_LOGCONFIG(TAG, "SPI bus:");
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LOG_PIN(" CLK Pin: ", this->clk_);
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LOG_PIN(" MISO Pin: ", this->miso_);
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LOG_PIN(" MOSI Pin: ", this->mosi_);
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#ifdef USE_SPI_ARDUINO_BACKEND
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ESP_LOGCONFIG(TAG, " Using HW SPI: %s", YESNO(this->hw_spi_ != nullptr));
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#endif // USE_SPI_ARDUINO_BACKEND
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}
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float SPIComponent::get_setup_priority() const { return setup_priority::BUS; }
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void SPIComponent::cycle_clock_(bool value) {
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uint32_t start = arch_get_cpu_cycle_count();
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while (start - arch_get_cpu_cycle_count() < this->wait_cycle_)
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;
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this->clk_->digital_write(value);
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start += this->wait_cycle_;
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while (start - arch_get_cpu_cycle_count() < this->wait_cycle_)
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;
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}
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// NOLINTNEXTLINE
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#ifndef CLANG_TIDY
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#pragma GCC optimize("unroll-loops")
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// NOLINTNEXTLINE
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#pragma GCC optimize("O2")
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#endif // CLANG_TIDY
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template<SPIBitOrder BIT_ORDER, SPIClockPolarity CLOCK_POLARITY, SPIClockPhase CLOCK_PHASE, bool READ, bool WRITE>
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uint8_t HOT SPIComponent::transfer_(uint8_t data) {
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// Clock starts out at idle level
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this->clk_->digital_write(CLOCK_POLARITY);
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uint8_t out_data = 0;
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for (uint8_t i = 0; i < 8; i++) {
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uint8_t shift;
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if (BIT_ORDER == BIT_ORDER_MSB_FIRST) {
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shift = 7 - i;
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} else {
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shift = i;
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}
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if (CLOCK_PHASE == CLOCK_PHASE_LEADING) {
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// sampling on leading edge
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if (WRITE) {
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this->mosi_->digital_write(data & (1 << shift));
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}
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// SAMPLE!
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this->cycle_clock_(!CLOCK_POLARITY);
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if (READ) {
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out_data |= uint8_t(this->miso_->digital_read()) << shift;
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}
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this->cycle_clock_(CLOCK_POLARITY);
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} else {
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// sampling on trailing edge
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this->cycle_clock_(!CLOCK_POLARITY);
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if (WRITE) {
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this->mosi_->digital_write(data & (1 << shift));
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}
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// SAMPLE!
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this->cycle_clock_(CLOCK_POLARITY);
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if (READ) {
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out_data |= uint8_t(this->miso_->digital_read()) << shift;
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}
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}
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}
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App.feed_wdt();
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return out_data;
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}
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// Generate with (py3):
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//
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// from itertools import product
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// bit_orders = ['BIT_ORDER_LSB_FIRST', 'BIT_ORDER_MSB_FIRST']
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// clock_pols = ['CLOCK_POLARITY_LOW', 'CLOCK_POLARITY_HIGH']
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// clock_phases = ['CLOCK_PHASE_LEADING', 'CLOCK_PHASE_TRAILING']
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// reads = [False, True]
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// writes = [False, True]
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// cpp_bool = {False: 'false', True: 'true'}
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// for b, cpol, cph, r, w in product(bit_orders, clock_pols, clock_phases, reads, writes):
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// if not r and not w:
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// continue
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// print(f"template uint8_t SPIComponent::transfer_<{b}, {cpol}, {cph}, {cpp_bool[r]}, {cpp_bool[w]}>(uint8_t
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// data);")
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template uint8_t SPIComponent::transfer_<BIT_ORDER_LSB_FIRST, CLOCK_POLARITY_LOW, CLOCK_PHASE_LEADING, false, true>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_LSB_FIRST, CLOCK_POLARITY_LOW, CLOCK_PHASE_LEADING, true, false>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_LSB_FIRST, CLOCK_POLARITY_LOW, CLOCK_PHASE_LEADING, true, true>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_LSB_FIRST, CLOCK_POLARITY_LOW, CLOCK_PHASE_TRAILING, false, true>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_LSB_FIRST, CLOCK_POLARITY_LOW, CLOCK_PHASE_TRAILING, true, false>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_LSB_FIRST, CLOCK_POLARITY_LOW, CLOCK_PHASE_TRAILING, true, true>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_LSB_FIRST, CLOCK_POLARITY_HIGH, CLOCK_PHASE_LEADING, false, true>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_LSB_FIRST, CLOCK_POLARITY_HIGH, CLOCK_PHASE_LEADING, true, false>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_LSB_FIRST, CLOCK_POLARITY_HIGH, CLOCK_PHASE_LEADING, true, true>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_LSB_FIRST, CLOCK_POLARITY_HIGH, CLOCK_PHASE_TRAILING, false, true>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_LSB_FIRST, CLOCK_POLARITY_HIGH, CLOCK_PHASE_TRAILING, true, false>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_LSB_FIRST, CLOCK_POLARITY_HIGH, CLOCK_PHASE_TRAILING, true, true>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_MSB_FIRST, CLOCK_POLARITY_LOW, CLOCK_PHASE_LEADING, false, true>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_MSB_FIRST, CLOCK_POLARITY_LOW, CLOCK_PHASE_LEADING, true, false>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_MSB_FIRST, CLOCK_POLARITY_LOW, CLOCK_PHASE_LEADING, true, true>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_MSB_FIRST, CLOCK_POLARITY_LOW, CLOCK_PHASE_TRAILING, false, true>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_MSB_FIRST, CLOCK_POLARITY_LOW, CLOCK_PHASE_TRAILING, true, false>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_MSB_FIRST, CLOCK_POLARITY_LOW, CLOCK_PHASE_TRAILING, true, true>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_MSB_FIRST, CLOCK_POLARITY_HIGH, CLOCK_PHASE_LEADING, false, true>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_MSB_FIRST, CLOCK_POLARITY_HIGH, CLOCK_PHASE_LEADING, true, false>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_MSB_FIRST, CLOCK_POLARITY_HIGH, CLOCK_PHASE_LEADING, true, true>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_MSB_FIRST, CLOCK_POLARITY_HIGH, CLOCK_PHASE_TRAILING, false, true>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_MSB_FIRST, CLOCK_POLARITY_HIGH, CLOCK_PHASE_TRAILING, true, false>(
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uint8_t data);
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template uint8_t SPIComponent::transfer_<BIT_ORDER_MSB_FIRST, CLOCK_POLARITY_HIGH, CLOCK_PHASE_TRAILING, true, true>(
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uint8_t data);
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} // namespace spi
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} // namespace esphome
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