allow PDM mic on SPI

Author: ladyada

variants/pybadge_m4/variant.cpp

@@ -34,13 +34,13 @@ const PinDescription g_APinDescription[]=
   { PORTB,  3, PIO_ANALOG, PIN_ATTR_ANALOG, ADC_Channel15, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_3 },
   { PORTB,  2, PIO_ANALOG, PIN_ATTR_ANALOG, ADC_Channel14, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_2 },
   { PORTA,  14, PIO_SERCOM, PIN_ATTR_PWM_E, No_ADC_Channel, TC3_CH0, TC3_CH0, EXTERNAL_INT_14 },
-  { PORTA,  16, PIO_DIGITAL, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_0  },
-  { PORTA,  18, PIO_SERCOM, PIO_SERCOM, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_2  },
+  { PORTA,  16, PIO_SERCOM_ALT, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_0  },
+  { PORTA,  18, PIO_SERCOM_ALT, PIO_SERCOM, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_2  },
   { PORTB,  14, PIO_DIGITAL, PIN_ATTR_PWM_F, No_ADC_Channel, TCC4_CH0, TC5_CH0, EXTERNAL_INT_14 },
 
   // Digital High
   { PORTA, 15, PIO_DIGITAL, PIN_ATTR_PWM_E, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_15  }, // D8 - NEOPIXEL
-  { PORTA,  19, PIO_DIGITAL, PIN_ATTR_PWM_E, No_ADC_Channel, TC3_CH1, TC3_CH1,  EXTERNAL_INT_3 },
+  { PORTA,  19, PIO_SERCOM_ALT, PIN_ATTR_PWM_E, No_ADC_Channel, TC3_CH1, TC3_CH1,  EXTERNAL_INT_3 },
   { PORTA,  20, PIO_DIGITAL, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER,  EXTERNAL_INT_4 },
   { PORTA,  21, PIO_DIGITAL, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER,  EXTERNAL_INT_5 },
   { PORTA,  22, PIO_SERCOM, PIN_ATTR_PWM_G, No_ADC_Channel, TCC0_CH2, TC4_CH0, EXTERNAL_INT_6 },

variants/pybadge_m4/variant.h

@@ -136,7 +136,7 @@ static const uint8_t ATN = PIN_ATN;
 /*
  * SPI Interfaces
  */
-#define SPI_INTERFACES_COUNT 2
+#define SPI_INTERFACES_COUNT 3
 
 #define PIN_SPI_MISO         (26u)
 #define PIN_SPI_MOSI         (27u)
@@ -150,7 +150,7 @@ static const uint8_t MOSI = PIN_SPI_MOSI ;
 static const uint8_t MISO = PIN_SPI_MISO ;
 static const uint8_t SCK  = PIN_SPI_SCK ;
 
-  // Internal SPI for TFT
+// Internal SPI for TFT
 #define PIN_SPI1_MOSI         (41u)
 #define PIN_SPI1_SCK          (42u)
 #define PIN_SPI1_MISO         (43u)
@@ -163,6 +163,19 @@ static const uint8_t MOSI1 = PIN_SPI1_MOSI ;
 static const uint8_t MISO1 = PIN_SPI1_MISO ;
 static const uint8_t SCK1 = PIN_SPI1_SCK ;
 
+// SPI for PDM mic
+#define PIN_SPI2_MOSI         (9u)
+#define PIN_SPI2_SCK          (5u)
+#define PIN_SPI2_MISO         (6u)
+#define PERIPH_SPI2           sercom3
+#define PAD_SPI2_TX           SPI_PAD_3_SCK_1
+#define PAD_SPI2_RX           SERCOM_RX_PAD_2
+
+static const uint8_t SS2	  = 10 ;
+static const uint8_t MOSI2 = PIN_SPI2_MOSI ;
+static const uint8_t MISO2 = PIN_SPI2_MISO ;
+static const uint8_t SCK2 = PIN_SPI2_SCK ;
+
 /*
  * Wire Interfaces
  */