Two Serial-enabled shields connected to the Arduino M0 Pro?

Official Hardware Classic Zero
1

Hi
I have two shields I want to connect to my Arduino M0 Pro: a Wifi Shield and a GPRS Shield. Both require a kind of Serial interface with TX and RX. With Arduino Leonardo I solved it by having Serial1 and SoftwareSerial. M0 is different, it only have 2 Serials attached to USB and Serial5(?) attached to pins D0 and D1. I read up some materials on muxing and so on, but not sure it is applicable.

Bottom line: is there a way to connect these two devices to M0 Pro, may be even using additional harware?

Thanks

2

This is what I found in variants.cpp. Where do i find these pins (14+)?

 // 14/15 - USART3 (Serial3)
  { PIOD, PIO_PD4B_TXD3,     ID_PIOD, PIO_PERIPH_B, PIO_DEFAULT, PIN_ATTR_DIGITAL,                  NO_ADC, NO_ADC, NOT_ON_PWM,  NOT_ON_TIMER }, // TXD3
  { PIOD, PIO_PD5B_RXD3,     ID_PIOD, PIO_PERIPH_B, PIO_DEFAULT, PIN_ATTR_DIGITAL,                  NO_ADC, NO_ADC, NOT_ON_PWM,  NOT_ON_TIMER }, // RXD3

  // 16/17 - USART1 (Serial2)
  { PIOA, PIO_PA13A_TXD1,    ID_PIOA, PIO_PERIPH_A, PIO_DEFAULT, PIN_ATTR_DIGITAL,                  NO_ADC, NO_ADC, NOT_ON_PWM,  NOT_ON_TIMER }, // TXD1
  { PIOA, PIO_PA12A_RXD1,    ID_PIOA, PIO_PERIPH_A, PIO_DEFAULT, PIN_ATTR_DIGITAL,                  NO_ADC, NO_ADC, NOT_ON_PWM,  NOT_ON_TIMER }, // RXD1

  // 18/19 - USART0 (Serial1)
  { PIOA, PIO_PA11A_TXD0,    ID_PIOA, PIO_PERIPH_A, PIO_DEFAULT, PIN_ATTR_DIGITAL,                  NO_ADC, NO_ADC, NOT_ON_PWM,  NOT_ON_TIMER }, // TXD0
  { PIOA, PIO_PA10A_RXD0,    ID_PIOA, PIO_PERIPH_A, PIO_DEFAULT, PIN_ATTR_DIGITAL,                  NO_ADC, NO_ADC, NOT_ON_PWM,  NOT_ON_TIMER }, // RXD0
3

ArchHasher:
This is what I found in variants.cpp. Where do i find these pins (14+)?

 // 14/15 - USART3 (Serial3)

{ PIOD, PIO_PD4B_TXD3,    ID_PIOD, PIO_PERIPH_B, PIO_DEFAULT, PIN_ATTR_DIGITAL,                  NO_ADC, NO_ADC, NOT_ON_PWM,  NOT_ON_TIMER }, // TXD3
  { PIOD, PIO_PD5B_RXD3,    ID_PIOD, PIO_PERIPH_B, PIO_DEFAULT, PIN_ATTR_DIGITAL,                  NO_ADC, NO_ADC, NOT_ON_PWM,  NOT_ON_TIMER }, // RXD3

// 16/17 - USART1 (Serial2)
  { PIOA, PIO_PA13A_TXD1,    ID_PIOA, PIO_PERIPH_A, PIO_DEFAULT, PIN_ATTR_DIGITAL,                  NO_ADC, NO_ADC, NOT_ON_PWM,  NOT_ON_TIMER }, // TXD1
  { PIOA, PIO_PA12A_RXD1,    ID_PIOA, PIO_PERIPH_A, PIO_DEFAULT, PIN_ATTR_DIGITAL,                  NO_ADC, NO_ADC, NOT_ON_PWM,  NOT_ON_TIMER }, // RXD1

// 18/19 - USART0 (Serial1)
  { PIOA, PIO_PA11A_TXD0,    ID_PIOA, PIO_PERIPH_A, PIO_DEFAULT, PIN_ATTR_DIGITAL,                  NO_ADC, NO_ADC, NOT_ON_PWM,  NOT_ON_TIMER }, // TXD0
  { PIOA, PIO_PA10A_RXD0,    ID_PIOA, PIO_PERIPH_A, PIO_DEFAULT, PIN_ATTR_DIGITAL,                  NO_ADC, NO_ADC, NOT_ON_PWM,  NOT_ON_TIMER }, // RXD0

this is not for M0

4

Juraj:
this is not for M0

Thank you... I got it from the library arduino\hardware\sam\1.6.11. Any idea how to solve the issue with M0?

5

ArchHasher:
Thank you... I got it from the library arduino\hardware\sam\1.6.11. Any idea how to solve the issue with M0?

sam is for Due (cortex m3)

M0 is in SAMD

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