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81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
#if defined(USE_ESP32_VARIANT_ESP32S2) || defined(USE_ESP32_VARIANT_ESP32S3)
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#include "usb_uart.h"
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#include "usb/usb_host.h"
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#include "esphome/core/log.h"
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#include "esphome/components/bytebuffer/bytebuffer.h"
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namespace esphome {
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namespace usb_uart {
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using namespace bytebuffer;
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/**
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* CH34x
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*/
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void USBUartTypeCH34X::enable_channels() {
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// enable the channels
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for (auto channel : this->channels_) {
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if (!channel->initialised_)
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continue;
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usb_host::transfer_cb_t callback = [=](const usb_host::TransferStatus &status) {
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if (!status.success) {
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ESP_LOGE(TAG, "Control transfer failed, status=%s", esp_err_to_name(status.error_code));
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channel->initialised_ = false;
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}
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};
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uint8_t divisor = 7;
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uint32_t clk = 12000000;
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auto baud_rate = channel->baud_rate_;
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if (baud_rate < 256000) {
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if (baud_rate > 6000000 / 255) {
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divisor = 3;
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clk = 6000000;
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} else if (baud_rate > 750000 / 255) {
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divisor = 2;
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clk = 750000;
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} else if (baud_rate > 93750 / 255) {
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divisor = 1;
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clk = 93750;
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} else {
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divisor = 0;
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clk = 11719;
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}
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}
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ESP_LOGV(TAG, "baud_rate: %" PRIu32 ", divisor: %d, clk: %" PRIu32, baud_rate, divisor, clk);
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auto factor = static_cast<uint8_t>(clk / baud_rate);
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if (factor == 0 || factor == 0xFF) {
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ESP_LOGE(TAG, "Invalid baud rate %" PRIu32, baud_rate);
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channel->initialised_ = false;
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continue;
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}
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if ((clk / factor - baud_rate) > (baud_rate - clk / (factor + 1)))
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factor++;
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factor = 256 - factor;
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uint16_t value = 0xC0;
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if (channel->stop_bits_ == UART_CONFIG_STOP_BITS_2)
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value |= 4;
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switch (channel->parity_) {
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case UART_CONFIG_PARITY_NONE:
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break;
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default:
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value |= 8 | ((channel->parity_ - 1) << 4);
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break;
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}
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value |= channel->data_bits_ - 5;
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value <<= 8;
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value |= 0x8C;
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uint8_t cmd = 0xA1 + channel->index_;
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if (channel->index_ >= 2)
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cmd += 0xE;
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this->control_transfer(USB_VENDOR_DEV | usb_host::USB_DIR_OUT, cmd, value, (factor << 8) | divisor, callback);
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}
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USBUartTypeCdcAcm::enable_channels();
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}
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} // namespace usb_uart
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} // namespace esphome
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#endif // USE_ESP32_VARIANT_ESP32S2 || USE_ESP32_VARIANT_ESP32S3
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