samd/samd_soc: Allow a board to configure the low-level MCU config.
The board specific #defines will be moved to individual boards.
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/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* This file initialises the USB (tinyUSB) and USART (SERCOM). Board USART settings
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* are set in 'boards/<board>/mpconfigboard.h.
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*
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* IMPORTANT: Please refer to "I/O Multiplexing and Considerations" chapters
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* in device datasheets for I/O Pin functions and assignments.
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2019 Damien P. George
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@ -24,56 +30,53 @@
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* THE SOFTWARE.
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*/
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#include "py/runtime.h"
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#include "modmachine.h"
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#include "samd_soc.h"
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#include "tusb.h"
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static void uart0_init(void) {
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// "MP" macros defined in "boards/$(BOARD)/mpconfigboard.h"
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mp_obj_t machine_uart_init(void) {
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// Firstly, assign alternate function SERCOM PADs to GPIO pins.
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PORT->Group[MP_PIN_GRP].PINCFG[MP_TX_PIN].bit.PMUXEN = 1; // Enable
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PORT->Group[MP_PIN_GRP].PINCFG[MP_RX_PIN].bit.PMUXEN = 1; // Enable
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PORT->Group[MP_PIN_GRP].PMUX[MP_PERIPHERAL_MUX].reg = MP_PORT_FUNC; // Sets PMUXE & PMUXO in 1 hit.
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uint32_t rxpo = MP_RXPO_PAD; // 1=Pad1,3=Pad3 Rx data
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uint32_t txpo = MP_TXPO_PAD; // 0=pad0,1=Pad2 Tx data
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// Initialise the clocks
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#if defined(MCU_SAMD21)
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// SERCOM0, TX=PA06=PAD2, RX=PA07=PAD3, ALT-D
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PORT->Group[0].PMUX[3].reg = 0x33;
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PORT->Group[0].PINCFG[6].reg = 1;
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PORT->Group[0].PINCFG[7].reg = 1;
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PM->APBCMASK.bit.SERCOM0_ = 1;
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GCLK->CLKCTRL.reg = GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK0 | GCLK_CLKCTRL_ID_SERCOM0_CORE;
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PM->APBCMASK.bit.MP_SERCOMx = 1; // Enable synchronous clock
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GCLK->CLKCTRL.reg = GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK0 | MP_SERCOM_GCLK_ID_x_CORE; // Select multiplexer generic clock source and enable.
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// Wait while it updates synchronously.
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while (GCLK->STATUS.bit.SYNCBUSY) {
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}
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uint32_t rxpo = 3;
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uint32_t txpo = 1;
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#elif defined(MCU_SAMD51)
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// SERCOM3, TX=PA17=PAD0, RX=PA16=PAD1, ALT-D
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PORT->Group[0].PMUX[8].reg = 0x33;
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PORT->Group[0].PINCFG[16].reg = 1;
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PORT->Group[0].PINCFG[17].reg = 1;
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// Use Generator 0 which is already enabled and switched to DFLL @ 48MHz
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GCLK->PCHCTRL[SERCOM3_GCLK_ID_CORE].reg = GCLK_PCHCTRL_CHEN | GCLK_PCHCTRL_GEN_GCLK0;
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MCLK->APBBMASK.bit.SERCOM3_ = 1;
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uint32_t rxpo = 1;
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uint32_t txpo = 2;
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GCLK->PCHCTRL[MP_SERCOM_GCLK_ID_x_CORE].reg = GCLK_PCHCTRL_CHEN | GCLK_PCHCTRL_GEN_GCLK0;
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MCLK->APBBMASK.bit.MP_SERCOMx = 1;
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#endif
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// Setup the Peripheral.
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// Reset (clear) the peripheral registers.
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while (USARTx->USART.SYNCBUSY.bit.SWRST) {
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}
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USARTx->USART.CTRLA.bit.SWRST = 1;
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USARTx->USART.CTRLA.bit.SWRST = 1; // Reset all Registers, disable peripheral
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while (USARTx->USART.SYNCBUSY.bit.SWRST) {
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}
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USARTx->USART.CTRLA.reg =
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SERCOM_USART_CTRLA_DORD
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| SERCOM_USART_CTRLA_RXPO(rxpo)
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| SERCOM_USART_CTRLA_TXPO(txpo)
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| SERCOM_USART_CTRLA_MODE(1)
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// Set the register bits as needed
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// (CMODE (async),CHSIZE (8),FORM (no parity),SBMODE (1 stop) already 0).
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USARTx->USART.CTRLA.reg = // USARTx = SERCOMx set in "boards/$(BOARD)/mpconfigboard.h"
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SERCOM_USART_CTRLA_DORD // Data order
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| SERCOM_USART_CTRLA_RXPO(rxpo) // Set Pad#
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| SERCOM_USART_CTRLA_TXPO(txpo) // Set Pad#
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| SERCOM_USART_CTRLA_MODE(1) // USART with internal clock
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;
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USARTx->USART.CTRLB.reg = SERCOM_USART_CTRLB_RXEN | SERCOM_USART_CTRLB_TXEN;
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USARTx->USART.CTRLB.reg = SERCOM_USART_CTRLB_RXEN | SERCOM_USART_CTRLB_TXEN; // Enable Rx & Tx
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while (USARTx->USART.SYNCBUSY.bit.CTRLB) {
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}
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// Baud rate is clock dependant.
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#if CPU_FREQ == 8000000
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uint32_t baud = 50437; // 115200 baud; 65536*(1 - 16 * 115200/8e6)
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#elif CPU_FREQ == 48000000
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#elif CPU_FREQ == 120000000
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uint32_t baud = 64529; // 115200 baud; 65536*(1 - 16 * 115200/120e6)
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#endif
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USARTx->USART.BAUD.bit.BAUD = baud;
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USARTx->USART.CTRLA.bit.ENABLE = 1;
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USARTx->USART.BAUD.bit.BAUD = baud; // Set Baud
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USARTx->USART.CTRLA.bit.ENABLE = 1; // Enable the peripheral
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// Wait for the Registers to update.
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while (USARTx->USART.SYNCBUSY.bit.ENABLE) {
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}
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return mp_const_none;
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}
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// Disconnect SERCOM from GPIO pins. (Can't SWRST, as that will totally kill USART).
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mp_obj_t machine_uart_deinit(void) {
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// Reset
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printf("Disabling the Alt-Funct, releasing the USART pins for GPIO... \n");
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PORT->Group[MP_PIN_GRP].PINCFG[MP_TX_PIN].bit.PMUXEN = 0; // Disable
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PORT->Group[MP_PIN_GRP].PINCFG[MP_RX_PIN].bit.PMUXEN = 0; // Disable
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return mp_const_none;
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}
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static void usb_init(void) {
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// Init USB clock
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#if defined(MCU_SAMD21)
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while (GCLK->STATUS.bit.SYNCBUSY) {
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}
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// Configure PA10 as output for LED
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PORT->Group[0].DIRSET.reg = 1 << 10;
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#elif defined(MCU_SAMD51)
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GCLK->GENCTRL[1].reg = 1 << GCLK_GENCTRL_DIV_Pos | GCLK_GENCTRL_GENEN | GCLK_GENCTRL_SRC_DFLL;
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while (GCLK->SYNCBUSY.bit.GENCTRL1) {
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}
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// Configure PA22 as output for LED
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PORT->Group[0].DIRSET.reg = 1 << 22;
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#endif
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SysTick_Config(CPU_FREQ / 1000);
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uart0_init();
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machine_uart_init();
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usb_init();
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}
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#include <stdint.h>
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#include "sam.h"
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#if defined(MCU_SAMD21)
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#define CPU_FREQ (48000000)
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#define USARTx SERCOM0
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#elif defined(MCU_SAMD51)
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#define CPU_FREQ (48000000)
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#define USARTx SERCOM3
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#endif
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void samd_init(void);
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void samd_main(void);
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