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making SPI CS optional (#988)

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* making SPI CS optional

* CS pin should be declared as optional or required in CONFIG_SCHEMA

* changed SPI_DEVICE_SCHEMA to a function, like i2c

* added spi_device_schema() to pcd8544, lint fixes

* updated max31856 with new spi_device_schema()

* cleanup imports

Co-authored-by: Ilya Goldberg <iggie@mac.com>
This commit is contained in:
igg
2020-06-10 13:03:11 -07:00
committed by GitHub
parent bab562dc3a
commit 821c1a8bbd
17 changed files with 67 additions and 43 deletions
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esphome/components/spi/spi.h
+17 -13
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@@ -127,19 +127,21 @@ class SPIComponent : public Component {
template<SPIBitOrder BIT_ORDER, SPIClockPolarity CLOCK_POLARITY, SPIClockPhase CLOCK_PHASE, uint32_t DATA_RATE>
void enable(GPIOPin *cs) {
SPIComponent::debug_enable(cs->get_pin());
if (cs) {
SPIComponent::debug_enable(cs->get_pin());
if (this->hw_spi_ != nullptr) {
uint8_t data_mode = (uint8_t(CLOCK_POLARITY) << 1) | uint8_t(CLOCK_PHASE);
SPISettings settings(DATA_RATE, BIT_ORDER, data_mode);
this->hw_spi_->beginTransaction(settings);
} else {
this->clk_->digital_write(CLOCK_POLARITY);
this->wait_cycle_ = uint32_t(F_CPU) / DATA_RATE / 2ULL;
if (this->hw_spi_ != nullptr) {
uint8_t data_mode = (uint8_t(CLOCK_POLARITY) << 1) | uint8_t(CLOCK_PHASE);
SPISettings settings(DATA_RATE, BIT_ORDER, data_mode);
this->hw_spi_->beginTransaction(settings);
} else {
this->clk_->digital_write(CLOCK_POLARITY);
this->wait_cycle_ = uint32_t(F_CPU) / DATA_RATE / 2ULL;
}
this->active_cs_ = cs;
this->active_cs_->digital_write(false);
}
this->active_cs_ = cs;
this->active_cs_->digital_write(false);
}
void disable();
@@ -174,8 +176,10 @@ class SPIDevice {
void set_cs_pin(GPIOPin *cs) { cs_ = cs; }
void spi_setup() {
this->cs_->setup();
this->cs_->digital_write(true);
if (this->cs_) {
this->cs_->setup();
this->cs_->digital_write(true);
}
}
void enable() { this->parent_->template enable<BIT_ORDER, CLOCK_POLARITY, CLOCK_PHASE, DATA_RATE>(this->cs_); }