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Cleanup SPI_Multiple_Buses (#3527)

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* Utilize prepoc symbols for SPI pins
* Adjusts for GPIO pins when ALTERNATE_PINS is set
This commit is contained in:
Michael Uman 2020-01-20 05:37:47 -08:00 committed by Me No Dev
parent 5443d7ca93
commit 579e04be25
1 changed files with 40 additions and 10 deletions
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46
libraries/SPI/examples/SPI_Multiple_Buses/SPI_Multiple_Buses.ino
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@ -15,6 +15,30 @@
*/
#include <SPI.h>
// Define ALTERNATE_PINS to use non-standard GPIO pins for SPI bus
#ifdef ALTERNATE_PINS
#define VSPI_MISO 2
#define VSPI_MOSI 4
#define VSPI_SCLK 0
#define VSPI_SS 33
#define HSPI_MISO 26
#define HSPI_MOSI 27
#define HSPI_SCLK 25
#define HSPI_SS 32
#else
#define VSPI_MISO MISO
#define VSPI_MOSI MOSI
#define VSPI_SCLK SCK
#define VSPI_SS SS
#define HSPI_MISO 12
#define HSPI_MOSI 13
#define HSPI_SCLK 14
#define HSPI_SS 15
#endif
static const int spiClk = 1000000; // 1 MHz
//uninitalised pointers to SPI objects
@ -28,22 +52,28 @@ void setup() {
//clock miso mosi ss
#ifndef ALTERNATE_PINS
//initialise vspi with default pins
//SCLK = 18, MISO = 19, MOSI = 23, SS = 5
vspi->begin();
#else
//alternatively route through GPIO pins of your choice
//hspi->begin(0, 2, 4, 33); //SCLK, MISO, MOSI, SS
vspi->begin(VSPI_SCLK, VSPI_MISO, VSPI_MOSI, VSPI_SS); //SCLK, MISO, MOSI, SS
#endif
#ifndef ALTERNATE_PINS
//initialise hspi with default pins
//SCLK = 14, MISO = 12, MOSI = 13, SS = 15
hspi->begin();
#else
//alternatively route through GPIO pins
//hspi->begin(25, 26, 27, 32); //SCLK, MISO, MOSI, SS
hspi->begin(HSPI_SCLK, HSPI_MISO, HSPI_MOSI, HSPI_SS); //SCLK, MISO, MOSI, SS
#endif
//set up slave select pins as outputs as the Arduino API
//doesn't handle automatically pulling SS low
pinMode(5, OUTPUT); //VSPI SS
pinMode(15, OUTPUT); //HSPI SS
pinMode(VSPI_SS, OUTPUT); //VSPI SS
pinMode(HSPI_SS, OUTPUT); //HSPI SS
}
@ -60,9 +90,9 @@ void vspiCommand() {
//use it as you would the regular arduino SPI API
vspi->beginTransaction(SPISettings(spiClk, MSBFIRST, SPI_MODE0));
digitalWrite(5, LOW); //pull SS slow to prep other end for transfer
digitalWrite(VSPI_SS, LOW); //pull SS slow to prep other end for transfer
vspi->transfer(data);
digitalWrite(5, HIGH); //pull ss high to signify end of data transfer
digitalWrite(VSPI_SS, HIGH); //pull ss high to signify end of data transfer
vspi->endTransaction();
}
@ -70,8 +100,8 @@ void hspiCommand() {
byte stuff = 0b11001100;
hspi->beginTransaction(SPISettings(spiClk, MSBFIRST, SPI_MODE0));
digitalWrite(15, LOW);
digitalWrite(HSPI_SS, LOW);
hspi->transfer(stuff);
digitalWrite(15, HIGH);
digitalWrite(HSPI_SS, HIGH);
hspi->endTransaction();
}