For the following program, determine the output and the SPI clock frequency when the oscillatorfrequency, fOSC = 24 MHz. Determine the slave state at the end of the program.#include <SPI.h>void setup (void) {Serial.begin(115200);digitalWrite(SS, HIGH);SPI.begin ();SPI.setClockDivider(SPI_CLOCK_DIV8);}void loop (void) {char c;digitalWrite(SS, LOW);// send test stringfor (const char * p = "Hello, world!\r" ; c = *p; p++) {SPI.transfer (c);Serial.print(c);}digitalWrite(SS, HIGH);delay(2000);}
Question
For the following program, determine the output and the SPI clock frequency when the oscillatorfrequency, fOSC = 24 MHz. Determine the slave state at the end of the program.#include <SPI.h>void setup (void) {Serial.begin(115200);digitalWrite(SS, HIGH);SPI.begin ();SPI.setClockDivider(SPI_CLOCK_DIV8);}void loop (void) {char c;digitalWrite(SS, LOW);// send test stringfor (const char * p = "Hello, world!\r" ; c = *p; p++) {SPI.transfer (c);Serial.print(c);}digitalWrite(SS, HIGH);delay(2000);}
Solution
The output of the program will be "Hello, world!" printed to the serial monitor every 2 seconds.
The SPI clock frequency is determined by the oscillator frequency divided by the clock divider. In this case, the oscillator frequency fOSC is 24 MHz and the clock divider is 8 (SPI_CLOCK_DIV8). Therefore, the SPI clock frequency is 24 MHz / 8 = 3 MHz.
The slave state at the end of the program is HIGH. This is because the last command in the loop function is digitalWrite(SS, HIGH), which sets the slave select (SS) pin to HIGH. This effectively deselects the slave device, putting it in a standby state until it is selected again (when SS is set to LOW).
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