kopia lustrzana https://github.com/micropython/micropython
samd/samd_soc: Allow a board to configure the low-level MCU config.
The board specific #defines will be moved to individual boards.pull/7979/head
Peter van der Burg
Damien George
rodzic
cd2223b8fe
commit
4c132614e1
|
|
@ -1,6 +1,12 @@
|
|||
/*
|
||||
* This file is part of the MicroPython project, http://micropython.org/
|
||||
*
|
||||
* This file initialises the USB (tinyUSB) and USART (SERCOM). Board USART settings
|
||||
* are set in 'boards/<board>/mpconfigboard.h.
|
||||
*
|
||||
* IMPORTANT: Please refer to "I/O Multiplexing and Considerations" chapters
|
||||
* in device datasheets for I/O Pin functions and assignments.
|
||||
*
|
||||
* The MIT License (MIT)
|
||||
*
|
||||
* Copyright (c) 2019 Damien P. George
|
||||
|
|
@ -24,56 +30,53 @@
|
|||
* THE SOFTWARE.
|
||||
*/
|
||||
|
||||
#include "py/runtime.h"
|
||||
#include "modmachine.h"
|
||||
#include "samd_soc.h"
|
||||
#include "tusb.h"
|
||||
|
||||
static void uart0_init(void) {
|
||||
// "MP" macros defined in "boards/$(BOARD)/mpconfigboard.h"
|
||||
mp_obj_t machine_uart_init(void) {
|
||||
// Firstly, assign alternate function SERCOM PADs to GPIO pins.
|
||||
PORT->Group[MP_PIN_GRP].PINCFG[MP_TX_PIN].bit.PMUXEN = 1; // Enable
|
||||
PORT->Group[MP_PIN_GRP].PINCFG[MP_RX_PIN].bit.PMUXEN = 1; // Enable
|
||||
PORT->Group[MP_PIN_GRP].PMUX[MP_PERIPHERAL_MUX].reg = MP_PORT_FUNC; // Sets PMUXE & PMUXO in 1 hit.
|
||||
uint32_t rxpo = MP_RXPO_PAD; // 1=Pad1,3=Pad3 Rx data
|
||||
uint32_t txpo = MP_TXPO_PAD; // 0=pad0,1=Pad2 Tx data
|
||||
|
||||
// Initialise the clocks
|
||||
#if defined(MCU_SAMD21)
|
||||
|
||||
// SERCOM0, TX=PA06=PAD2, RX=PA07=PAD3, ALT-D
|
||||
PORT->Group[0].PMUX[3].reg = 0x33;
|
||||
PORT->Group[0].PINCFG[6].reg = 1;
|
||||
PORT->Group[0].PINCFG[7].reg = 1;
|
||||
|
||||
PM->APBCMASK.bit.SERCOM0_ = 1;
|
||||
GCLK->CLKCTRL.reg = GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK0 | GCLK_CLKCTRL_ID_SERCOM0_CORE;
|
||||
PM->APBCMASK.bit.MP_SERCOMx = 1; // Enable synchronous clock
|
||||
GCLK->CLKCTRL.reg = GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK0 | MP_SERCOM_GCLK_ID_x_CORE; // Select multiplexer generic clock source and enable.
|
||||
// Wait while it updates synchronously.
|
||||
while (GCLK->STATUS.bit.SYNCBUSY) {
|
||||
}
|
||||
|
||||
uint32_t rxpo = 3;
|
||||
uint32_t txpo = 1;
|
||||
|
||||
#elif defined(MCU_SAMD51)
|
||||
|
||||
// SERCOM3, TX=PA17=PAD0, RX=PA16=PAD1, ALT-D
|
||||
PORT->Group[0].PMUX[8].reg = 0x33;
|
||||
PORT->Group[0].PINCFG[16].reg = 1;
|
||||
PORT->Group[0].PINCFG[17].reg = 1;
|
||||
|
||||
// Use Generator 0 which is already enabled and switched to DFLL @ 48MHz
|
||||
GCLK->PCHCTRL[SERCOM3_GCLK_ID_CORE].reg = GCLK_PCHCTRL_CHEN | GCLK_PCHCTRL_GEN_GCLK0;
|
||||
MCLK->APBBMASK.bit.SERCOM3_ = 1;
|
||||
|
||||
uint32_t rxpo = 1;
|
||||
uint32_t txpo = 2;
|
||||
|
||||
GCLK->PCHCTRL[MP_SERCOM_GCLK_ID_x_CORE].reg = GCLK_PCHCTRL_CHEN | GCLK_PCHCTRL_GEN_GCLK0;
|
||||
MCLK->APBBMASK.bit.MP_SERCOMx = 1;
|
||||
#endif
|
||||
|
||||
// Setup the Peripheral.
|
||||
// Reset (clear) the peripheral registers.
|
||||
while (USARTx->USART.SYNCBUSY.bit.SWRST) {
|
||||
}
|
||||
USARTx->USART.CTRLA.bit.SWRST = 1;
|
||||
USARTx->USART.CTRLA.bit.SWRST = 1; // Reset all Registers, disable peripheral
|
||||
while (USARTx->USART.SYNCBUSY.bit.SWRST) {
|
||||
}
|
||||
|
||||
USARTx->USART.CTRLA.reg =
|
||||
SERCOM_USART_CTRLA_DORD
|
||||
| SERCOM_USART_CTRLA_RXPO(rxpo)
|
||||
| SERCOM_USART_CTRLA_TXPO(txpo)
|
||||
| SERCOM_USART_CTRLA_MODE(1)
|
||||
// Set the register bits as needed
|
||||
// (CMODE (async),CHSIZE (8),FORM (no parity),SBMODE (1 stop) already 0).
|
||||
USARTx->USART.CTRLA.reg = // USARTx = SERCOMx set in "boards/$(BOARD)/mpconfigboard.h"
|
||||
SERCOM_USART_CTRLA_DORD // Data order
|
||||
| SERCOM_USART_CTRLA_RXPO(rxpo) // Set Pad#
|
||||
| SERCOM_USART_CTRLA_TXPO(txpo) // Set Pad#
|
||||
| SERCOM_USART_CTRLA_MODE(1) // USART with internal clock
|
||||
;
|
||||
USARTx->USART.CTRLB.reg = SERCOM_USART_CTRLB_RXEN | SERCOM_USART_CTRLB_TXEN;
|
||||
USARTx->USART.CTRLB.reg = SERCOM_USART_CTRLB_RXEN | SERCOM_USART_CTRLB_TXEN; // Enable Rx & Tx
|
||||
while (USARTx->USART.SYNCBUSY.bit.CTRLB) {
|
||||
}
|
||||
|
||||
// Baud rate is clock dependant.
|
||||
#if CPU_FREQ == 8000000
|
||||
uint32_t baud = 50437; // 115200 baud; 65536*(1 - 16 * 115200/8e6)
|
||||
#elif CPU_FREQ == 48000000
|
||||
|
|
@ -81,12 +84,26 @@ static void uart0_init(void) {
|
|||
#elif CPU_FREQ == 120000000
|
||||
uint32_t baud = 64529; // 115200 baud; 65536*(1 - 16 * 115200/120e6)
|
||||
#endif
|
||||
USARTx->USART.BAUD.bit.BAUD = baud;
|
||||
USARTx->USART.CTRLA.bit.ENABLE = 1;
|
||||
USARTx->USART.BAUD.bit.BAUD = baud; // Set Baud
|
||||
USARTx->USART.CTRLA.bit.ENABLE = 1; // Enable the peripheral
|
||||
// Wait for the Registers to update.
|
||||
while (USARTx->USART.SYNCBUSY.bit.ENABLE) {
|
||||
}
|
||||
|
||||
return mp_const_none;
|
||||
}
|
||||
|
||||
// Disconnect SERCOM from GPIO pins. (Can't SWRST, as that will totally kill USART).
|
||||
mp_obj_t machine_uart_deinit(void) {
|
||||
// Reset
|
||||
printf("Disabling the Alt-Funct, releasing the USART pins for GPIO... \n");
|
||||
PORT->Group[MP_PIN_GRP].PINCFG[MP_TX_PIN].bit.PMUXEN = 0; // Disable
|
||||
PORT->Group[MP_PIN_GRP].PINCFG[MP_RX_PIN].bit.PMUXEN = 0; // Disable
|
||||
|
||||
return mp_const_none;
|
||||
}
|
||||
|
||||
|
||||
static void usb_init(void) {
|
||||
// Init USB clock
|
||||
#if defined(MCU_SAMD21)
|
||||
|
|
@ -142,21 +159,15 @@ void samd_init(void) {
|
|||
while (GCLK->STATUS.bit.SYNCBUSY) {
|
||||
}
|
||||
|
||||
// Configure PA10 as output for LED
|
||||
PORT->Group[0].DIRSET.reg = 1 << 10;
|
||||
|
||||
#elif defined(MCU_SAMD51)
|
||||
|
||||
GCLK->GENCTRL[1].reg = 1 << GCLK_GENCTRL_DIV_Pos | GCLK_GENCTRL_GENEN | GCLK_GENCTRL_SRC_DFLL;
|
||||
while (GCLK->SYNCBUSY.bit.GENCTRL1) {
|
||||
}
|
||||
|
||||
// Configure PA22 as output for LED
|
||||
PORT->Group[0].DIRSET.reg = 1 << 22;
|
||||
|
||||
#endif
|
||||
|
||||
SysTick_Config(CPU_FREQ / 1000);
|
||||
uart0_init();
|
||||
machine_uart_init();
|
||||
usb_init();
|
||||
}
|
||||
|
|
|
|||
|
|
@ -29,18 +29,6 @@
|
|||
#include <stdint.h>
|
||||
#include "sam.h"
|
||||
|
||||
#if defined(MCU_SAMD21)
|
||||
|
||||
#define CPU_FREQ (48000000)
|
||||
#define USARTx SERCOM0
|
||||
|
||||
#elif defined(MCU_SAMD51)
|
||||
|
||||
#define CPU_FREQ (48000000)
|
||||
#define USARTx SERCOM3
|
||||
|
||||
#endif
|
||||
|
||||
void samd_init(void);
|
||||
void samd_main(void);
|
||||
|
||||
|
|
|
|||
Ładowanie…
Reference in New Issue