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not having any SPI breaks things - maybe just have a 'fake' sck+mosi only SPI for sercom 0?

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This commit is contained in:
ladyada 2017-09-17 16:28:09 -04:00
parent de847a1fbe
commit 04731bca54
2 changed files with 20 additions and 4 deletions
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9
variants/gemma_m0/variant.cpp
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@ -61,13 +61,13 @@
const PinDescription g_APinDescription[]=
{
// GPIO 0, 1, 2 on external pads
// 0 - SERCOM0 for I2C SDA or UART TX, Captouch, IRQ, PWM out TCC0/WO[0], and gen purpose pin
// 0 - SERCOM0.0 for I2C SDA, UART TX, SPI MOSI, Captouch, IRQ, PWM out TCC0/WO[0], and gen purpose pin
{ PORTA, 4, PIO_SERCOM_ALT, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER), No_ADC_Channel, PWM0_CH0, TCC0_CH0, EXTERNAL_INT_4 }, // TCC0/WO[0]
// 1 - ADC, DAC, IRQ, Captouch and general purpose pin - no timer
{ PORTA, 2, PIO_ANALOG, PIN_ATTR_ANALOG, ADC_Channel0, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_2 }, // ADC/AIN[0]
// 2 - SERCOM0 for I2C SCL or UART RX, Captouch, IRQ, PWM out TCC0/WO[1], and gen purpose pin
// 2 - SERCOM0 for I2C SCL, UART RX, SPI CLK, Captouch, IRQ, PWM out TCC0/WO[1], and gen purpose pin
{ PORTA, 5, PIO_SERCOM_ALT, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER), No_ADC_Channel, PWM0_CH1, TCC0_CH1, EXTERNAL_INT_5 }, // TCC0/WO[1]
// GPIO 3 & 4 - DotStar internal data/clock
@ -101,7 +101,10 @@ const PinDescription g_APinDescription[]=
{ PORTA, 10, PIO_DIGITAL, (PIN_ATTR_DIGITAL), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_10 },
{ PORTA, 11, PIO_DIGITAL, (PIN_ATTR_DIGITAL), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_11 },
// For unknown reasons we need to have gpio 16-21 so here are 6 extra pins (shrug)
// Placeholder #16 - extra Sercom/SPI pin that doesnt actually get used
{ PORTA, 6, PIO_SERCOM_ALT, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER), No_ADC_Channel, PWM1_CH0, TCC1_CH0, EXTERNAL_INT_6 }, // TCC0/WO[1]
// For unknown reasons we need to have gpio 17-21 so here are extra pins (shrug)
{ PORTA, 14, PIO_DIGITAL, (PIN_ATTR_DIGITAL), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_14 },
{ PORTA, 15, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER), No_ADC_Channel, PWM3_CH1, TC3_CH1, EXTERNAL_INT_15 },
{ PORTA, 16, PIO_TIMER, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER), No_ADC_Channel, PWM2_CH0, TCC2_CH0, EXTERNAL_INT_0 }, // TCC2/WO[0]

15
variants/gemma_m0/variant.h
View file

@ -116,7 +116,20 @@ static const uint8_t DAC0 = PIN_DAC0;
/*
* SPI Interfaces
*/
#define SPI_INTERFACES_COUNT 0 // :( not enough pins
#define SPI_INTERFACES_COUNT 1 // we'll just have SPI CLK and MOSI on sercom 0, no MISO
#define PIN_SPI_MISO (6u) // PA06, not actually available
#define PIN_SPI_MOSI (0ul) // PA04
#define PIN_SPI_SCK (2ul) // PA05
#define PERIPH_SPI sercom0
#define PAD_SPI_TX SPI_PAD_0_SCK_1
#define PAD_SPI_RX SERCOM_RX_PAD_2
static const uint8_t SS = 1 ; // only pin remaining (shrug)
static const uint8_t MOSI = PIN_SPI_MOSI ;
static const uint8_t MISO = PIN_SPI_MISO ;
static const uint8_t SCK = PIN_SPI_SCK ;
/*
* Wire Interfaces