Created
August 16, 2017 03:58
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Simple test program to shift out some bits to measure the difference between different Atmel chips and SPI vs. shiftOut()
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| // Simple test program to shift out some bits to measure the difference between | |
| // different Atmel chips and SPI vs. shiftOut() | |
| #include <SPI.h> | |
| /* for Feather and Arduino Uno | |
| #define RCLK_PIN 9 // latching pin for the shift registers to show values at their outputs | |
| #define DATA_PIN MOSI | |
| #define CLK_PIN SCK | |
| // */ | |
| //* for attiny85 | |
| #define RCLK_PIN 4 // latching pin for the shift registers to show values at their outputs | |
| #define DATA_PIN 1 | |
| #define CLK_PIN 2 | |
| // */ | |
| // pick one of these | |
| //#define SHIFTMODE | |
| #define SPIMODE | |
| void setup() { | |
| pinMode(RCLK_PIN, OUTPUT); | |
| #ifdef SHIFTMODE | |
| pinMode(DATA_PIN, OUTPUT); | |
| pinMode(CLK_PIN, OUTPUT); | |
| shiftOut(DATA_PIN, CLK_PIN, LSBFIRST, 0); | |
| #endif | |
| #ifdef SPIMODE | |
| SPI.begin(); | |
| SPI.beginTransaction(SPISettings(16000000, LSBFIRST, SPI_MODE0)); | |
| #endif | |
| } | |
| uint8_t num = 0x00; | |
| void loop() { | |
| digitalWrite(RCLK_PIN, LOW); | |
| #ifdef SHIFTMODE | |
| shiftOut(DATA_PIN, CLK_PIN, LSBFIRST, num); | |
| #endif | |
| #ifdef SPIMODE | |
| SPI.transfer(num); | |
| #endif | |
| digitalWrite(RCLK_PIN, HIGH); | |
| num += 1; | |
| delay(200); | |
| } |
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