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我正在尝试使我的 SAMD21 芯片成为 SPI 从设备。

我有以下引脚：

  • PB10 作为 MOSI
  • PB11 作为 SCK
  • PA10 作为 SS
  • PA12 作为味噌

这些管脚大部分属于SERCOM4

但是，当我按如下方式设置引脚时，引脚无法正常工作：

 PORT->Group[PORTB].PINCFG[10].bit.PMUXEN = 0x1; //Enable Peripheral Multiplexing for SERCOM4 SPI PA12 Arduino PIN22
 PORT->Group[PORTA].PMUX[6].bit.PMUXE = 0x3; //SERCOM 4 is selected for peripheral use of this pad (0x3 selects peripheral function D: SERCOM-ALT)
 PORT->Group[PORTB].PINCFG[11].bit.PMUXEN = 0x1; //Enable Peripheral Multiplexing for SERCOM4 SPI PB09 Arduino PIN16
 PORT->Group[PORTB].PMUX[4].bit.PMUXO = 0x3; //SERCOM 4 is selected for peripheral use of this pad (0x3 selects peripheral function D: SERCOM-ALT)
 PORT->Group[PORTA].PINCFG[10].bit.PMUXEN = 0x1; //Enable Peripheral Multiplexing for SERCOM4 SPI PB10 Arduino PIN23
 PORT->Group[PORTB].PMUX[5].bit.PMUXE = 0x3; //SERCOM 4 is selected for peripheral use of this pad (0x3 selects peripheral function D: SERCOM-ALT)
 PORT->Group[PORTA].PINCFG[12].bit.PMUXEN = 0x1; //Enable Peripheral Multiplexing for SERCOM4 SPI PB11 Arduino PIN24
 PORT->Group[PORTB].PMUX[5].bit.PMUXO = 0x3; //SERCOM 4 is selected for peripheral use of this pad (0x3 selects peripheral function D: SERCOM-ALT)

我使用 https://github.com/lenvm/SercomSPISlave的库

我使用 arduino IDE 和 SAMD: M0 或其他东西 M0 Pro (navtive) 板布局对芯片进行编程。

根据文档的引脚：

  • | 1 | 1 <- 德克萨斯 | PA10 | | EIC/EXTINT[10] ADC/AIN[18] PTC/X[2] *SERCOM0/PAD[2] TCC0/WO[2] TCC1/WO[0]
  • | 22 | 1 | PA12 | 味噌 | EIC/EXTINT[12] SERCOM2/PAD[0] *SERCOM4/PAD[0] TCC2/WO[0] TCC0/WO[6]
  • | 23 | 4 | PB10 | 莫西 | EIC/EXTINT[10] *SERCOM4/PAD[2] TC5/WO[0] TCC0/WO[4]
  • | 24 | 3 | PB11 | SCK | EIC/EXTINT[11] *SERCOM4/PAD[3] TC5/WO[1] TCC0/WO[5]
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