some alternate SPI's for CPX

Author: ladyada

variants/circuitplay/variant.cpp

@@ -35,13 +35,13 @@ const PinDescription g_APinDescription[]=
   { PORTB,  3, PIO_SERCOM_ALT, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_3 },                    // GPIO D3 / A4 / SCL
   { PORTA, 28, PIO_COM, PIN_ATTR_NONE, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE },                           // GPIO D4 / Left Button
   { PORTA, 14, PIO_DIGITAL, (PIN_ATTR_DIGITAL), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_14 },                    // GPIO D5 / Right button
-  { PORTA,  5, PIO_TIMER, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER), ADC_Channel5, PWM0_CH1, TCC0_CH1, EXTERNAL_INT_5 },   // GPIO D6 / A1
+  { PORTA,  5, PIO_SERCOM_ALT, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER), ADC_Channel5, PWM0_CH1, TCC0_CH1, EXTERNAL_INT_5 },   // GPIO D6 / A1
   { PORTA, 15, PIO_TIMER, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER), No_ADC_Channel, PWM3_CH1, TC3_CH1, EXTERNAL_INT_15 }, // GPIO D7 / Slide Switch
 
   // Digital High
   { PORTB, 23, PIO_DIGITAL, PIN_ATTR_NONE, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE },                       // GPIO D8 / NeoPixels
-  { PORTA,  6, PIO_TIMER, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER), ADC_Channel6, PWM1_CH0, TCC1_CH0, EXTERNAL_INT_6 },   // GPIO D9 / A2
-  { PORTA,  7, PIO_TIMER, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER), ADC_Channel7, PWM1_CH1, TCC1_CH1, EXTERNAL_INT_7 },   // GPIO D10 / A3
+  { PORTA,  6, PIO_SERCOM_ALT, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER), ADC_Channel6, PWM1_CH0, TCC1_CH0, EXTERNAL_INT_6 },   // GPIO D9 / A2
+  { PORTA,  7, PIO_SERCOM_ALT, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER), ADC_Channel7, PWM1_CH1, TCC1_CH1, EXTERNAL_INT_7 },   // GPIO D10 / A3
   { PORTA, 30, PIO_DIGITAL, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_NONE },                    // GPIO D11 / Speaker Shutdown
   { PORTA,  2, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_ANALOG), ADC_Channel0, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_2 },       // GPIO D12 / VOut / A0
   // 13 (LED)

variants/circuitplay/variant.h

@@ -111,8 +111,9 @@ static const uint8_t DAC0 = PIN_DAC0;
 /*
  * SPI Interfaces
  */
-#define SPI_INTERFACES_COUNT 2
+#define SPI_INTERFACES_COUNT 3
 
+// SPI interface for QSPI flash
 #define PIN_SPI_MISO         (30u)
 #define PIN_SPI_SCK          (31u)
 #define PIN_SPI_MOSI         (32u)
@@ -139,6 +140,29 @@ static const uint8_t MOSI1 = PIN_SPI_MOSI ;
 static const uint8_t MISO1 = PIN_SPI_MISO ;
 static const uint8_t SCK1  = PIN_SPI_SCK ;
 
+
+// Extra hardware for SD card
+#define PIN_SPI2_SCK          (10u)
+#define PIN_SPI2_MOSI         (9u)
+#define PIN_SPI2_MISO         (6u)
+#define PIN_SPI2_SS           (5u)
+#define PERIPH_SPI2           sercom0
+#define PAD_SPI2_TX           SPI_PAD_2_SCK_3  // MOSI / SCK
+#define PAD_SPI2_RX           SERCOM_RX_PAD_1  // MISO not avail
+
+static const uint8_t SS2   = 5 ;
+static const uint8_t MOSI2 = PIN_SPI2_MOSI ;
+static const uint8_t MISO2 = PIN_SPI2_MISO ;
+static const uint8_t SCK2  = PIN_SPI2_SCK ;
+
+
+// Needed for SD library
+#define SDCARD_SPI      SPI2
+#define SDCARD_MISO_PIN PIN_SPI2_MISO
+#define SDCARD_MOSI_PIN PIN_SPI2_MOSI
+#define SDCARD_SCK_PIN  PIN_SPI2_SCK
+#define SDCARD_SS_PIN   PIN_SPI2_SS
+
 /*
  * Wire Interfaces
  */