Communications Between 3 uC

[fteloken]

Hello, first thanks for you library, this is simple and objective. I have some questions and problems about with a particular implementation. I have test between two devices firstly, but the data receive in slave device is correctly, but in master request this data is changing from a constant value. The code Master Device appears like: `#include

ESP32DMASPI::Master master; static const uint8_t BUFFER_SIZE = 255; uint8_t spi_master_tx_buf; uint8_t spi_master_rx_buf;

void setup() { Serial.begin(115200); // to use DMA buffer, use these methods to allocate buffer spi_master_tx_buf = master.allocDMABuffer(BUFFER_SIZE); spi_master_rx_buf = master.allocDMABuffer(BUFFER_SIZE);

master.setDataMode(SPI_MODE0);
master.setFrequency(SPI_MASTER_FREQ_8M);
master.setMaxTransferSize(BUFFER_SIZE);
master.setDMAChannel(1); // 1 or 2 only
master.setQueueSize(1);  // transaction queue size

// begin() after setting
// HSPI = CS: 15, CLK: 14, MOSI: 13, MISO: 12
// VSPI = CS: 5, CLK: 18, MOSI: 23, MISO: 19
master.begin(HSPI);

}

void loop() { spi_master_tx_buf[0] = 55; // start and wait to complete transaction master.transfer(spi_master_tx_buf, spi_master_rx_buf, BUFFER_SIZE); Serial.print("RX BUF[0] = "); Serial.print(spi_master_rx_buf[0]); Serial.print(" | TC BUF[0] = "); Serial.print(spi_master_tx_buf[0]); Serial.println(); vTaskDelay(pdMS_TO_TICKS(500)); }`

The code for Slave Device: `#include

ESP32DMASPI::Slave slave;

static const uint8_t BUFFER_SIZE = 255; uint8_t spi_slave_tx_buf; uint8_t spi_slave_rx_buf;

void setup() { Serial.begin(115200);

// to use DMA buffer, use these methods to allocate buffer
spi_slave_tx_buf = slave.allocDMABuffer(BUFFER_SIZE);
spi_slave_rx_buf = slave.allocDMABuffer(BUFFER_SIZE);

slave.setDataMode(SPI_MODE0);
slave.setMaxTransferSize(BUFFER_SIZE);
slave.setDMAChannel(2); // 1 or 2 only
slave.setQueueSize(1);  // transaction queue size

// begin() after setting
// HSPI = CS: 15, CLK: 14, MOSI: 13, MISO: 12
// VSPI = CS: 5, CLK: 18, MOSI: 23, MISO: 19
slave.begin(HSPI);

}

void loop() { // set buffer (reply to master) data here spi_slave_tx_buf[0] = 88; // if there is no transaction in queue, add transaction slave.wait(spi_slave_rx_buf, spi_slave_tx_buf, BUFFER_SIZE); // Send data // if transaction has completed from master, // available() returns size of results of transaction, // and buffer is automatically updated while (slave.available()) { Serial.print("Request from master [RX]: "); Serial.print(spi_slave_rx_buf[0]); Serial.print(" | Request from master [TX]: "); Serial.print(spi_slave_tx_buf[0]); Serial.println(); slave.pop(); } }`

In master Device the Serial print this:

RX BUF[0] = 8 | TC BUF[0] = 55 RX BUF[0] = 88 | TC BUF[0] = 55 RX BUF[0] = 88 | TC BUF[0] = 55 RX BUF[0] = 44 | TC BUF[0] = 55 RX BUF[0] = 44 | TC BUF[0] = 55 RX BUF[0] = 88 | TC BUF[0] = 55 RX BUF[0] = 44 | TC BUF[0] = 55 RX BUF[0] = 88 | TC BUF[0] = 55 RX BUF[0] = 44 | TC BUF[0] = 55 RX BUF[0] = 88 | TC BUF[0] = 55 RX BUF[0] = 44 | TC BUF[0] = 55 RX BUF[0] = 44 | TC BUF[0] = 55 RX BUF[0] = 88 | TC BUF[0] = 55 RX BUF[0] = 44 | TC BUF[0] = 55 RX BUF[0] = 44 | TC BUF[0] = 55 RX BUF[0] = 88 | TC BUF[0] = 55 RX BUF[0] = 88 | TC BUF[0] = 55

I change SPI Mode to 4 modes, speed data, but this dont resolve the issue !? The slave mode receive data correctly !

My second question is about increase a second slave with different SS control pinout, adding two devices in the system. I can set manually the master.begin(HSPI), for differents objects ? Thanks a lot !!

[hideakitai]

@fteloken Hi, thanks for reporting. Do the examples work fine on your devices?

[hideakitai]

I'm going to close this issue, but feel free to reopen if you still have a problem.