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Code Issues Releases Wiki Activity

Fix PN532 SPI communication (#1511)

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This commit is contained in:
Jesse Hills
2021-02-06 11:02:20 +13:00
committed by GitHub
parent bccaa78a90
commit b351cd94d7
8 changed files with 203 additions and 103 deletions
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84
esphome/components/pn532_i2c/pn532_i2c.cpp
View File

@@ -36,6 +36,90 @@ bool PN532I2C::read_data(std::vector<uint8_t> &data, uint8_t len) {
return true;
}
bool PN532I2C::read_response(uint8_t command, std::vector<uint8_t> &data) {
ESP_LOGV(TAG, "Reading response");
uint8_t len = this->read_response_length_();
if (len == 0) {
return false;
}
ESP_LOGV(TAG, "Reading response of length %d", len);
if (!this->read_data(data, 6 + len + 2)) {
ESP_LOGD(TAG, "No response data");
return false;
}
if (data[1] != 0x00 && data[2] != 0x00 && data[3] != 0xFF) {
// invalid packet
ESP_LOGV(TAG, "read data invalid preamble!");
return false;
}
bool valid_header = (static_cast<uint8_t>(data[4] + data[5]) == 0 && // LCS, len + lcs = 0
data[6] == 0xD5 && // TFI - frame from PN532 to system controller
data[7] == command + 1); // Correct command response
if (!valid_header) {
ESP_LOGV(TAG, "read data invalid header!");
return false;
}
data.erase(data.begin(), data.begin() + 6); // Remove headers
uint8_t checksum = 0;
for (int i = 0; i < len + 1; i++) {
uint8_t dat = data[i];
checksum += dat;
}
checksum = ~checksum + 1;
if (data[len + 1] != checksum) {
ESP_LOGV(TAG, "read data invalid checksum! %02X != %02X", data[len], checksum);
return false;
}
if (data[len + 2] != 0x00) {
ESP_LOGV(TAG, "read data invalid postamble!");
return false;
}
data.erase(data.begin(), data.begin() + 2); // Remove TFI and command code
data.erase(data.end() - 2, data.end()); // Remove checksum and postamble
return true;
}
uint8_t PN532I2C::read_response_length_() {
std::vector<uint8_t> data;
if (!this->read_data(data, 6)) {
return 0;
}
if (data[1] != 0x00 && data[2] != 0x00 && data[3] != 0xFF) {
// invalid packet
ESP_LOGV(TAG, "read data invalid preamble!");
return 0;
}
bool valid_header = (static_cast<uint8_t>(data[4] + data[5]) == 0 && // LCS, len + lcs = 0
data[6] == 0xD5); // TFI - frame from PN532 to system controller
if (!valid_header) {
ESP_LOGV(TAG, "read data invalid header!");
return 0;
}
this->send_nack_();
// full length of message, including TFI
uint8_t full_len = data[4];
// length of data, excluding TFI
uint8_t len = full_len - 1;
if (full_len == 0)
len = 0;
return len;
}
void PN532I2C::dump_config() {
PN532::dump_config();
LOG_I2C_DEVICE(this);

2
esphome/components/pn532_i2c/pn532_i2c.h
View File

@@ -14,6 +14,8 @@ class PN532I2C : public pn532::PN532, public i2c::I2CDevice {
protected:
bool write_data(const std::vector<uint8_t> &data) override;
bool read_data(std::vector<uint8_t> &data, uint8_t len) override;
bool read_response(uint8_t command, std::vector<uint8_t> &data) override;
uint8_t read_response_length_();
};
} // namespace pn532_i2c