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61cd8d8 Mar 8, 2018
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@me-no-dev @igrr
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/*
SPI Master Demo Sketch
Connect the SPI Master device to the following pins on the esp8266:
GPIO NodeMCU Name | Uno
===================================
15 D8 SS | D10
13 D7 MOSI | D11
12 D6 MISO | D12
14 D5 SCK | D13
Note: If the ESP is booting at a moment when the SPI Master has the Select line HIGH (deselected)
the ESP8266 WILL FAIL to boot!
See SPISlave_SafeMaster example for possible workaround
*/
#include <SPI.h>
class ESPMaster {
private:
uint8_t _ss_pin;
public:
ESPMaster(uint8_t pin): _ss_pin(pin) {}
void begin() {
pinMode(_ss_pin, OUTPUT);
digitalWrite(_ss_pin, HIGH);
}
uint32_t readStatus() {
digitalWrite(_ss_pin, LOW);
SPI.transfer(0x04);
uint32_t status = (SPI.transfer(0) | ((uint32_t)(SPI.transfer(0)) << 8) | ((uint32_t)(SPI.transfer(0)) << 16) | ((uint32_t)(SPI.transfer(0)) << 24));
digitalWrite(_ss_pin, HIGH);
return status;
}
void writeStatus(uint32_t status) {
digitalWrite(_ss_pin, LOW);
SPI.transfer(0x01);
SPI.transfer(status & 0xFF);
SPI.transfer((status >> 8) & 0xFF);
SPI.transfer((status >> 16) & 0xFF);
SPI.transfer((status >> 24) & 0xFF);
digitalWrite(_ss_pin, HIGH);
}
void readData(uint8_t * data) {
digitalWrite(_ss_pin, LOW);
SPI.transfer(0x03);
SPI.transfer(0x00);
for (uint8_t i = 0; i < 32; i++) {
data[i] = SPI.transfer(0);
}
digitalWrite(_ss_pin, HIGH);
}
void writeData(uint8_t * data, size_t len) {
uint8_t i = 0;
digitalWrite(_ss_pin, LOW);
SPI.transfer(0x02);
SPI.transfer(0x00);
while (len-- && i < 32) {
SPI.transfer(data[i++]);
}
while (i++ < 32) {
SPI.transfer(0);
}
digitalWrite(_ss_pin, HIGH);
}
String readData() {
char data[33];
data[32] = 0;
readData((uint8_t *)data);
return String(data);
}
void writeData(const char * data) {
writeData((uint8_t *)data, strlen(data));
}
};
ESPMaster esp(SS);
void send(const char * message) {
Serial.print("Master: ");
Serial.println(message);
esp.writeData(message);
delay(10);
Serial.print("Slave: ");
Serial.println(esp.readData());
Serial.println();
}
void setup() {
Serial.begin(115200);
SPI.begin();
esp.begin();
delay(1000);
send("Hello Slave!");
}
void loop() {
delay(1000);
send("Are you alive?");
}