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Implement variable length single word SPI writes. (#5678)

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This commit is contained in:
Clyde Stubbs
2023-11-27 07:54:12 +11:00
committed by GitHub
parent dbdcb39af9
commit 2e6d01ddff
3 changed files with 46 additions and 14 deletions
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esphome/components/spi/spi.cpp
+9 -5
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@@ -77,15 +77,19 @@ void SPIComponent::dump_config() {
void SPIDelegateDummy::begin_transaction() { ESP_LOGE(TAG, "SPIDevice not initialised - did you call spi_setup()?"); }
uint8_t SPIDelegateBitBash::transfer(uint8_t data) {
uint8_t SPIDelegateBitBash::transfer(uint8_t data) { return this->transfer_(data, 8); }
void SPIDelegateBitBash::write(uint16_t data, size_t num_bits) { this->transfer_(data, num_bits); }
uint16_t SPIDelegateBitBash::transfer_(uint16_t data, size_t num_bits) {
// Clock starts out at idle level
this->clk_pin_->digital_write(clock_polarity_);
uint8_t out_data = 0;
for (uint8_t i = 0; i < 8; i++) {
for (uint8_t i = 0; i != num_bits; i++) {
uint8_t shift;
if (bit_order_ == BIT_ORDER_MSB_FIRST) {
shift = 7 - i;
shift = num_bits - 1 - i;
} else {
shift = i;
}
@@ -94,7 +98,7 @@ uint8_t SPIDelegateBitBash::transfer(uint8_t data) {
// sampling on leading edge
this->sdo_pin_->digital_write(data & (1 << shift));
this->cycle_clock_();
out_data |= uint8_t(this->sdi_pin_->digital_read()) << shift;
out_data |= uint16_t(this->sdi_pin_->digital_read()) << shift;
this->clk_pin_->digital_write(!this->clock_polarity_);
this->cycle_clock_();
this->clk_pin_->digital_write(this->clock_polarity_);
@@ -104,7 +108,7 @@ uint8_t SPIDelegateBitBash::transfer(uint8_t data) {
this->clk_pin_->digital_write(!this->clock_polarity_);
this->sdo_pin_->digital_write(data & (1 << shift));
this->cycle_clock_();
out_data |= uint8_t(this->sdi_pin_->digital_read()) << shift;
out_data |= uint16_t(this->sdi_pin_->digital_read()) << shift;
this->clk_pin_->digital_write(this->clock_polarity_);
}
}