312444bbd2
Also, fixed pin mappings for rev B Metro M4: swap PA12 and PA13 on SPI 2x3 header swap A3 and A5 Comment out all frozen modules in CPX again to make room while waiting for SPI flash.
272 lines
9.3 KiB
C
272 lines
9.3 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016 Scott Shawcroft
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "shared-bindings/busio/SPI.h"
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#include "py/mperrno.h"
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#include "py/runtime.h"
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#include "hpl_sercom_config.h"
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#include "peripheral_clk_config.h"
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#include "hal/include/hal_gpio.h"
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#include "hal/include/hal_spi_m_sync.h"
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#include "hal/include/hpl_spi_m_sync.h"
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#include "peripherals.h"
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#include "pins.h"
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#include "shared_dma.h"
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// Convert frequency to clock-speed-dependent value. Return 0 if out of range.
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static uint8_t baudrate_to_baud_reg_value(const uint32_t baudrate) {
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uint32_t baud_reg_value = (uint32_t) (((float) PROTOTYPE_SERCOM_SPI_M_SYNC_CLOCK_FREQUENCY /
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(2 * baudrate)) + 0.5f);
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if (baud_reg_value > 0xff) {
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return 0;
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}
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return (uint8_t) baud_reg_value;
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}
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void common_hal_busio_spi_construct(busio_spi_obj_t *self,
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const mcu_pin_obj_t * clock, const mcu_pin_obj_t * mosi,
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const mcu_pin_obj_t * miso) {
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Sercom* sercom = NULL;
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uint8_t sercom_index;
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uint32_t clock_pinmux = 0;
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bool mosi_none = mosi == mp_const_none;
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bool miso_none = miso == mp_const_none;
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uint32_t mosi_pinmux = 0;
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uint32_t miso_pinmux = 0;
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uint8_t clock_pad = 0;
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uint8_t mosi_pad = 0;
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uint8_t miso_pad = 0;
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uint8_t dopo = 255;
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for (int i = 0; i < NUM_SERCOMS_PER_PIN; i++) {
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Sercom* potential_sercom = clock->sercom[i].sercom;
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sercom_index = clock->sercom[i].index; // 2 for SERCOM2, etc.
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if (potential_sercom == NULL ||
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#if defined(MICROPY_HW_APA102_SCK) && defined(MICROPY_HW_APA102_MOSI) && !defined(CIRCUITPY_BITBANG_APA102)
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(potential_sercom->SPI.CTRLA.bit.ENABLE != 0 &&
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potential_sercom != status_apa102.spi_master_instance.hw &&
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!apa102_sck_in_use)) {
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#else
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potential_sercom->SPI.CTRLA.bit.ENABLE != 0) {
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#endif
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continue;
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}
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clock_pinmux = PINMUX(clock->pin, (i == 0) ? MUX_C : MUX_D);
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clock_pad = clock->sercom[i].pad;
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if (!samd_peripheral_valid_spi_clock_pad(clock_pad)) {
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continue;
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}
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for (int j = 0; j < NUM_SERCOMS_PER_PIN; j++) {
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if (!mosi_none) {
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if(potential_sercom == mosi->sercom[j].sercom) {
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mosi_pinmux = PINMUX(mosi->pin, (j == 0) ? MUX_C : MUX_D);
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mosi_pad = mosi->sercom[j].pad;
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dopo = samd_peripheral_get_spi_dopo(clock_pad, mosi_pad);
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if (dopo > 0x3) {
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continue; // pad combination not possible
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}
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if (miso_none) {
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sercom = potential_sercom;
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break;
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}
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} else {
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continue;
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}
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}
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if (!miso_none) {
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for (int k = 0; k < NUM_SERCOMS_PER_PIN; k++) {
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if (potential_sercom == miso->sercom[k].sercom) {
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miso_pinmux = PINMUX(miso->pin, (k == 0) ? MUX_C : MUX_D);
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miso_pad = miso->sercom[k].pad;
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sercom = potential_sercom;
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break;
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}
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}
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}
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if (sercom != NULL) {
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break;
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}
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}
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if (sercom != NULL) {
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break;
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}
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}
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if (sercom == NULL) {
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mp_raise_ValueError("Invalid pins");
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}
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// Set up SPI clocks on SERCOM.
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samd_peripheral_sercom_clock_init(sercom, sercom_index);
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if (spi_m_sync_init(&self->spi_desc, sercom) != ERR_NONE) {
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mp_raise_OSError(MP_EIO);
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}
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hri_sercomspi_write_CTRLA_DOPO_bf(sercom, dopo);
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hri_sercomspi_write_CTRLA_DIPO_bf(sercom, miso_pad);
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// Always start at 250khz which is what SD cards need. They are sensitive to
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// SPI bus noise before they are put into SPI mode.
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uint8_t baud_value = baudrate_to_baud_reg_value(250000);
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if (baud_value == 0) {
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mp_raise_RuntimeError("SPI initial baudrate out of range.");
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}
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if (spi_m_sync_set_baudrate(&self->spi_desc, baud_value) != ERR_NONE) {
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// spi_m_sync_set_baudrate does not check for validity, just whether the device is
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// busy or not
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mp_raise_OSError(MP_EIO);
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}
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gpio_set_pin_pull_mode(clock->pin, GPIO_PULL_OFF);
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gpio_set_pin_function(clock->pin, clock_pinmux);
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claim_pin(clock);
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self->clock_pin = clock->pin;
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if (mosi_none) {
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self->MOSI_pin = NO_PIN;
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} else {
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gpio_set_pin_pull_mode(mosi->pin, GPIO_PULL_OFF);
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gpio_set_pin_function(mosi->pin, mosi_pinmux);
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self->MOSI_pin = mosi->pin;
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claim_pin(mosi);
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}
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if (miso_none) {
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self->MISO_pin = NO_PIN;
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} else {
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gpio_set_pin_pull_mode(miso->pin, GPIO_PULL_OFF);
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gpio_set_pin_function(miso->pin, miso_pinmux);
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self->MISO_pin = miso->pin;
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claim_pin(miso);
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}
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spi_m_sync_enable(&self->spi_desc);
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}
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bool common_hal_busio_spi_deinited(busio_spi_obj_t *self) {
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return self->clock_pin == NO_PIN;
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}
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void common_hal_busio_spi_deinit(busio_spi_obj_t *self) {
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if (common_hal_busio_spi_deinited(self)) {
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return;
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}
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spi_m_sync_disable(&self->spi_desc);
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spi_m_sync_deinit(&self->spi_desc);
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reset_pin(self->clock_pin);
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reset_pin(self->MOSI_pin);
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reset_pin(self->MISO_pin);
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self->clock_pin = NO_PIN;
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}
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bool common_hal_busio_spi_configure(busio_spi_obj_t *self,
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uint32_t baudrate, uint8_t polarity, uint8_t phase, uint8_t bits) {
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uint8_t baud_reg_value = baudrate_to_baud_reg_value(baudrate);
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if (baud_reg_value == 0) {
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mp_raise_ValueError("baudrate out of range");
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}
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void * hw = self->spi_desc.dev.prvt;
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// If the settings are already what we want then don't reset them.
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if (hri_sercomspi_get_CTRLA_CPHA_bit(hw) == phase &&
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hri_sercomspi_get_CTRLA_CPOL_bit(hw) == polarity &&
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hri_sercomspi_read_CTRLB_CHSIZE_bf(hw) == ((uint32_t)bits - 8) &&
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hri_sercomspi_read_BAUD_BAUD_bf(hw) == baud_reg_value) {
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return true;
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}
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// Disable, set values (most or all are enable-protected), and re-enable.
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spi_m_sync_disable(&self->spi_desc);
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hri_sercomspi_wait_for_sync(hw, SERCOM_SPI_SYNCBUSY_MASK);
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hri_sercomspi_write_CTRLA_CPHA_bit(hw, phase);
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hri_sercomspi_write_CTRLA_CPOL_bit(hw, polarity);
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hri_sercomspi_write_CTRLB_CHSIZE_bf(hw, bits - 8);
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hri_sercomspi_write_BAUD_BAUD_bf(hw, baud_reg_value);
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hri_sercomspi_wait_for_sync(hw, SERCOM_SPI_SYNCBUSY_MASK);
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spi_m_sync_enable(&self->spi_desc);
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hri_sercomspi_wait_for_sync(hw, SERCOM_SPI_SYNCBUSY_MASK);
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return true;
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}
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bool common_hal_busio_spi_try_lock(busio_spi_obj_t *self) {
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bool grabbed_lock = false;
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CRITICAL_SECTION_ENTER()
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if (!self->has_lock) {
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grabbed_lock = true;
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self->has_lock = true;
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}
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CRITICAL_SECTION_LEAVE();
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return grabbed_lock;
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}
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bool common_hal_busio_spi_has_lock(busio_spi_obj_t *self) {
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return self->has_lock;
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}
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void common_hal_busio_spi_unlock(busio_spi_obj_t *self) {
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self->has_lock = false;
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}
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bool common_hal_busio_spi_write(busio_spi_obj_t *self,
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const uint8_t *data, size_t len) {
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if (len == 0) {
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return true;
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}
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int32_t status;
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// if (len >= 16) {
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// status = shared_dma_write(self->spi_desc.dev.prvt, data, len);
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// } else {
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struct io_descriptor *spi_io;
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spi_m_sync_get_io_descriptor(&self->spi_desc, &spi_io);
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status = spi_io->write(spi_io, data, len);
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// }
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return status > 0; // Status is number of chars read or an error code < 0.
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}
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bool common_hal_busio_spi_read(busio_spi_obj_t *self,
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uint8_t *data, size_t len, uint8_t write_value) {
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if (len == 0) {
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return true;
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}
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int32_t status;
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// if (len >= 16) {
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// status = shared_dma_read(self->spi_desc.dev.prvt, data, len, write_value);
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// } else {
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self->spi_desc.dev.dummy_byte = write_value;
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struct io_descriptor *spi_io;
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spi_m_sync_get_io_descriptor(&self->spi_desc, &spi_io);
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status = spi_io->read(spi_io, data, len);
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// }
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return status > 0; // Status is number of chars read or an error code < 0.
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}
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