mirror of
https://github.com/RobTillaart/Arduino.git
synced 2024-10-03 18:09:02 -04:00
92 lines
1.9 KiB
C++
92 lines
1.9 KiB
C++
//
|
|
// FILE: MCP4921_VSPI.ino
|
|
// AUTHOR: Rob Tillaart
|
|
// PURPOSE: test MCP4921 lib
|
|
// DATE: 2021-07-31
|
|
// URL: https://github.com/RobTillaart/MCP4921
|
|
|
|
|
|
#ifndef ESP32
|
|
#error ESP32 only example, please select appropriate board
|
|
#endif
|
|
|
|
#include "MCP_DAC.h"
|
|
|
|
MCP4921 MCP; // HW SPI
|
|
|
|
|
|
volatile int x;
|
|
uint32_t start, stop;
|
|
|
|
|
|
void setup()
|
|
{
|
|
Serial.begin(115200);
|
|
Serial.println(__FILE__);
|
|
|
|
MCP.selectVSPI(); // needs to be called before begin()
|
|
// uses default HSPI SCLK=14, MISO=12, MOSI=13, SELECT=15
|
|
// uses default VSPI SCLK=18, MISO=19, MOSI=23, SELECT=5
|
|
MCP.begin(5); // 5 for VSPI and 15 for HSPI
|
|
|
|
// experimental
|
|
// MCP.setGPIOpins(23, 18, 19, 15); // CLK MISO MOSI SELECT
|
|
|
|
Serial.print("MCP_DAC_LIB_VERSION: ");
|
|
Serial.println(MCP_DAC_LIB_VERSION);
|
|
Serial.println();
|
|
Serial.print("CHANNELS:\t");
|
|
Serial.println(MCP.channels());
|
|
Serial.print("MAXVALUE:\t");
|
|
Serial.println(MCP.maxValue());
|
|
delay(100);
|
|
|
|
// MCP.setSPIspeed(100000); // for slower scopes
|
|
performance_test();
|
|
|
|
Serial.println("\nDone...");
|
|
}
|
|
|
|
|
|
void performance_test()
|
|
{
|
|
Serial.println();
|
|
Serial.println(__FUNCTION__);
|
|
|
|
start = micros();
|
|
for (uint16_t value = 0; value < MCP.maxValue(); value++)
|
|
{
|
|
x = MCP.analogWrite(value, 0);
|
|
}
|
|
stop = micros();
|
|
Serial.print(MCP.maxValue());
|
|
Serial.print(" x MCP.analogWrite():\t");
|
|
Serial.print(stop - start);
|
|
Serial.print("\t");
|
|
Serial.println((stop - start) / (MCP.maxValue() + 1.0) );
|
|
delay(10);
|
|
|
|
start = micros();
|
|
for (uint16_t value = 0; value < MCP.maxValue(); value++)
|
|
{
|
|
MCP.fastWriteA(value);
|
|
}
|
|
stop = micros();
|
|
Serial.print(MCP.maxValue());
|
|
Serial.print(" x MCP.fastWriteA():\t");
|
|
Serial.print(stop - start);
|
|
Serial.print("\t");
|
|
Serial.println((stop - start) / (MCP.maxValue() + 1.0) );
|
|
delay(10);
|
|
}
|
|
|
|
|
|
void loop()
|
|
{
|
|
performance_test();
|
|
}
|
|
|
|
|
|
// -- END OF FILE --
|
|
|