Need help in SPI.

[Vicky-S]

I got successfully programmed STM32F103 and I can able to do basic tasks.

Now I need help in using 2 SPI in STM32F103 at the same time. The STM32F103 has 2 SPI. Which is the default one uses Arduino SPI library and how can I initialize another SPI?

I need to access 2 SPI at the same program. I have tried to parallel the SPI devices in single library but its not working well. That's why I try to use 2 SPI.

[fpistm]

By default SPI instance are mapped on SPI1 using:

#define PIN_SPI_SS              PA4
#define PIN_SPI_MOSI            PA7
#define PIN_SPI_MISO            PA6
#define PIN_SPI_SCK PA5

See

Arduino_Core_STM32/variants/BLUEPILL_F103C8/variant.h

Line 99 in 0dd2047

#define PIN_SPI_MOSI PA7

SPI2 is available on pin PB15/PB14/PB13.
See here

Arduino_Core_STM32/variants/BLUEPILL_F103C8/PeripheralPins.c

Line 186 in 0dd2047

const PinMap PinMap_SPI_MOSI[] = {

To use the second one:
SPIClass SPITwo(PB15, PB14, PB13);
Then use it as you used the default SPI istance.
Note that you can't use the name SPI2 as it is defined by CMSIS.
More info are available here:
https://github.com/stm32duino/wiki/wiki/API#spi

[fpistm]

Hi @Vicky-S
Is this ok now?

[Vicky-S]

Default SPI works well. But getting error in using 2nd SPI.

error: 'SPIClass' does not name a type

SPIClass SPITwo(PB15, PB14, PB13);

^~~~~~~~

exit status 1
'SPIClass' does not name a type

[fpistm]

Looks strange....
No issue with this sketch:

#include <SPI.h>

SPIClass SPITwo(PB15, PB14, PB13);

void setup() {
  // put your setup code here, to run once:
  // initialize SPI:
  SPI.begin();
  SPITwo.begin();
}

void loop() {
  // put your main code here, to run repeatedly:

}

I assume you well include SPI.h.

[Vicky-S]

Ok. Sorry my mistake. I didn't extern the SPI Library. It works fine.

[Vicky-S]

Likewise how can I use several I2C and UART in STM32F103. ?

[fpistm]

HardwareSerial Serial2(USART2);
or
HardwareSerial Serial2(PA3, PA2);

Default I2C is on PB7/PB6 (D2/D3)

Arduino_Core_STM32/variants/BLUEPILL_F103C8/variant.h

Line 104 in 646fff4

#define PIN_WIRE_SDA PB7

So using Wire instance will use those pin.
else you can use the second I2C like that:
TwoWire i2cTwo(PB11, PB10);
or if you want change the default pin for Wire instance call this before begin():

Wire.setSCL(PB10);
Wire.setSDA(PB11);
Wire.begin();

For uart/i2c/SPI, this is the same basic usage as Arduino except some API added which has been added for better flexibility. Example the setSDA/SCL. There is some other added for SPI (setMISO,...), serial (setRx,..)

Here I use stm32 pin name PXy but you can also use the pin number Dx or x.

[Vicky-S]

Ok. Thanks.