Merge pull request #84 from Serasidis/patch-10
Merged example of using the SPI_1 and SPI_2 ports on STM32F103 (from Vasillis) - however it needs work to show how to use SPI 2
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/**
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SPI_1 and SPI_2 port example code
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Description:
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This sketch sends one byte with value 0x55 over the SPI_1 or SPI_2 port.
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The received byte (the answer from the SPI slave device) is stored to the <data> variable.
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The sketch as it is, works with SPI_1 port. For using the SPI_2 port, just
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un-comment all the nessesary code lines marked with <SPI_2> word.
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Created on 10 Jun 2015 by Vassilis Serasidis
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email: avrsite@yahoo.gr
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Using the first SPI port (SPI_1)
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SS <--> PA4 <--> BOARD_SPI1_NSS_PIN
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SCK <--> PA5 <--> BOARD_SPI1_SCK_PIN
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MISO <--> PA6 <--> BOARD_SPI1_MISO_PIN
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MOSI <--> PA7 <--> BOARD_SPI1_MOSI_PIN
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Using the second SPI port (SPI_2)
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SS <--> PB12 <--> BOARD_SPI2_NSS_PIN
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SCK <--> PB13 <--> BOARD_SPI2_SCK_PIN
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MISO <--> PB14 <--> BOARD_SPI2_MISO_PIN
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MOSI <--> PB15 <--> BOARD_SPI2_MOSI_PIN
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*/
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#include <SPI.h>
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#define SPI1_NSS_PIN PA4 //SPI_1 Chip Select pin is PA4. You can change it to the STM32 pin you want.
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#define SPI2_NSS_PIN PB12 //SPI_2 Chip Select pin is PB12. You can change it to the STM32 pin you want.
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//SPIClass SPI_2(2); //un-comment this line in case you want to use the SPI_2 port.
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byte data;
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void setup() {
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SPI.begin(); //Initialize the SPI_1 port.
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//SPI_2.begin(); //Initialize the SPI_2 port.
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SPI.setBitOrder(MSBFIRST); // Set the SPI_1 bit order
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//SPI_2.setBitOrder(MSBFIRST); // Set the SPI_2 bit order
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SPI.setDataMode(SPI_MODE0); //Set the SPI_2 data mode 0
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//SPI_2.setDataMode(SPI_MODE0); //Set the SPI_2 data mode 0
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SPI.setClockDivider(SPI_CLOCK_DIV16); // Slow speed (72 / 16 = 4.5 MHz SPI_1 speed)
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//SPI_2.setClockDivider(SPI_CLOCK_DIV16); // Slow speed (72 / 16 = 4.5 MHz SPI_2 speed)
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pinMode(SPI1_NSS_PIN, OUTPUT); // note: this must be after the SPI.begin() for gpio control of CSN
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//pinMode(SPI2_NSS_PIN, OUTPUT); // note: this must be after the SPI_2.begin() for gpio control of CSN
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}
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void loop() {
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digitalWrite(SPI1_NSS_PIN, LOW); // manually take CSN low for SPI_1 transmission
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//digitalWrite(SPI2_NSS_PIN, LOW); // manually take CSN low for SPI_2 transmission
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data = SPI.transfer(0x55); //Send the HEX data 0x55 over SPI-1 port and store the received byte to the <data> variable.
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//data = SPI_2.transfer(0x55); //Send the HEX data 0x55 over SPI-2 port and store the received byte to the <data> variable.
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digitalWrite(SPI1_NSS_PIN, HIGH); // manually take CSN high between spi transmissions
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//digitalWrite(SPI2_NSS_PIN, HIGH); // manually take CSN high between spi transmissions
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delayMicroseconds(10); //Delay 10 micro seconds.
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}
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