374 lines
13 KiB
C
374 lines
13 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 "boards/board.h"
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#include "common-hal/microcontroller/Pin.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 "supervisor/shared/rgb_led_status.h"
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#include "samd/dma.h"
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#include "samd/sercom.h"
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bool never_reset_sercoms[SERCOM_INST_NUM];
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void never_reset_sercom(Sercom* sercom) {
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// Reset all SERCOMs except the ones being used by on-board devices.
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Sercom *sercom_instances[SERCOM_INST_NUM] = SERCOM_INSTS;
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for (int i = 0; i < SERCOM_INST_NUM; i++) {
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if (sercom_instances[i] == sercom) {
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never_reset_sercoms[i] = true;
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break;
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}
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}
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}
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void allow_reset_sercom(Sercom* sercom) {
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// Reset all SERCOMs except the ones being used by on-board devices.
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Sercom *sercom_instances[SERCOM_INST_NUM] = SERCOM_INSTS;
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for (int i = 0; i < SERCOM_INST_NUM; i++) {
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if (sercom_instances[i] == sercom) {
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never_reset_sercoms[i] = false;
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break;
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}
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}
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}
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void reset_sercoms(void) {
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// Reset all SERCOMs except the ones being used by on-board devices.
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Sercom *sercom_instances[SERCOM_INST_NUM] = SERCOM_INSTS;
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for (int i = 0; i < SERCOM_INST_NUM; i++) {
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if (never_reset_sercoms[i]) {
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continue;
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}
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#ifdef MICROPY_HW_APA102_SERCOM
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if (sercom_instances[i] == MICROPY_HW_APA102_SERCOM) {
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continue;
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}
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#endif
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// SWRST is same for all modes of SERCOMs.
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sercom_instances[i]->SPI.CTRLA.bit.SWRST = 1;
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}
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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 || mosi == NULL;
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bool miso_none = miso == mp_const_none || miso == NULL;
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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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// Special case for SAMR boards.
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#ifdef PIN_PC19
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if (miso == &pin_PC19) {
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if (mosi == &pin_PB30 && clock == &pin_PC18) {
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sercom = SERCOM4;
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sercom_index = 4;
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clock_pinmux = MUX_F;
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mosi_pinmux = MUX_F;
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miso_pinmux = MUX_F;
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clock_pad = 3;
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mosi_pad = 2;
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miso_pad = 0;
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dopo = samd_peripherals_get_spi_dopo(clock_pad, mosi_pad);
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}
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// Error, leave SERCOM unset to throw an exception later.
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} else {
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#endif
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for (int i = 0; i < NUM_SERCOMS_PER_PIN; i++) {
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sercom_index = clock->sercom[i].index; // 2 for SERCOM2, etc.
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if (sercom_index >= SERCOM_INST_NUM) {
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continue;
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}
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Sercom* potential_sercom = sercom_insts[sercom_index];
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if (
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#if defined(MICROPY_HW_APA102_SCK) && defined(MICROPY_HW_APA102_MOSI) && !CIRCUITPY_BITBANG_APA102
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(potential_sercom->SPI.CTRLA.bit.ENABLE != 0 &&
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potential_sercom != status_apa102.spi_desc.dev.prvt &&
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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->number, (i == 0) ? MUX_C : MUX_D);
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clock_pad = clock->sercom[i].pad;
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if (!samd_peripherals_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 (sercom_index == mosi->sercom[j].index) {
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mosi_pinmux = PINMUX(mosi->number, (j == 0) ? MUX_C : MUX_D);
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mosi_pad = mosi->sercom[j].pad;
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dopo = samd_peripherals_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 (sercom_index == miso->sercom[k].index) {
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miso_pinmux = PINMUX(miso->number, (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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#ifdef PIN_PC19
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}
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#endif
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if (sercom == NULL) {
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mp_raise_ValueError(translate("Invalid pins"));
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}
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// Set up SPI clocks on SERCOM.
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samd_peripherals_sercom_clock_init(sercom, sercom_index);
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#if defined(MICROPY_HW_APA102_SCK) && defined(MICROPY_HW_APA102_MOSI) && !CIRCUITPY_BITBANG_APA102
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// if we're re-using the dotstar sercom, make sure it is disabled or the init will fail out
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hri_sercomspi_clear_CTRLA_ENABLE_bit(sercom);
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#endif
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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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// Pads must be set after spi_m_sync_init(), which uses default values from
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// the prototypical SERCOM.
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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 = samd_peripherals_spi_baudrate_to_baud_reg_value(250000);
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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_direction(clock->number, GPIO_DIRECTION_OUT);
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gpio_set_pin_pull_mode(clock->number, GPIO_PULL_OFF);
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gpio_set_pin_function(clock->number, clock_pinmux);
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claim_pin(clock);
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self->clock_pin = clock->number;
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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_direction(mosi->number, GPIO_DIRECTION_OUT);
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gpio_set_pin_pull_mode(mosi->number, GPIO_PULL_OFF);
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gpio_set_pin_function(mosi->number, mosi_pinmux);
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self->MOSI_pin = mosi->number;
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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_direction(miso->number, GPIO_DIRECTION_IN);
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gpio_set_pin_pull_mode(miso->number, GPIO_PULL_OFF);
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gpio_set_pin_function(miso->number, miso_pinmux);
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self->MISO_pin = miso->number;
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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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void common_hal_busio_spi_never_reset(busio_spi_obj_t *self) {
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never_reset_sercom(self->spi_desc.dev.prvt);
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never_reset_pin_number(self->clock_pin);
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never_reset_pin_number(self->MOSI_pin);
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never_reset_pin_number(self->MISO_pin);
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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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allow_reset_sercom(self->spi_desc.dev.prvt);
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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_number(self->clock_pin);
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reset_pin_number(self->MOSI_pin);
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reset_pin_number(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 = samd_peripherals_spi_baudrate_to_baud_reg_value(baudrate);
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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 = sercom_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 = sercom_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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bool common_hal_busio_spi_transfer(busio_spi_obj_t *self, uint8_t *data_out, uint8_t *data_in, 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 = sercom_dma_transfer(self->spi_desc.dev.prvt, data_out, data_in, len);
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} else {
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struct spi_xfer xfer;
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xfer.txbuf = data_out;
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xfer.rxbuf = data_in;
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xfer.size = len;
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status = spi_m_sync_transfer(&self->spi_desc, &xfer);
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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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uint32_t common_hal_busio_spi_get_frequency(busio_spi_obj_t* self) {
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return samd_peripherals_spi_baud_reg_value_to_baudrate(hri_sercomspi_read_BAUD_reg(self->spi_desc.dev.prvt));
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}
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uint8_t common_hal_busio_spi_get_phase(busio_spi_obj_t* self) {
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void * hw = self->spi_desc.dev.prvt;
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return hri_sercomspi_get_CTRLA_CPHA_bit(hw);
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}
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uint8_t common_hal_busio_spi_get_polarity(busio_spi_obj_t* self) {
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void * hw = self->spi_desc.dev.prvt;
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return hri_sercomspi_get_CTRLA_CPOL_bit(hw);
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}
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