circuitpython/ports/mimxrt10xx/common-hal/busio/SPI.c

/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2016 Scott Shawcroft
 * Copyright (c) 2019 Artur Pacholec
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

//TODO
#include "shared-bindings/busio/SPI.h"
#include "py/mperrno.h"
#include "py/runtime.h"
#include "periph.h"

#include "fsl_lpspi.h"

#include <stdio.h>

//bool never_reset_sercoms[SERCOM_INST_NUM];
//
//void never_reset_sercom(Sercom* sercom) {
//    // Reset all SERCOMs except the ones being used by on-board devices.
//    Sercom *sercom_instances[SERCOM_INST_NUM] = SERCOM_INSTS;
//    for (int i = 0; i < SERCOM_INST_NUM; i++) {
//        if (sercom_instances[i] == sercom) {
//            never_reset_sercoms[i] = true;
//            break;
//        }
//    }
//}
//
//void allow_reset_sercom(Sercom* sercom) {
//    // Reset all SERCOMs except the ones being used by on-board devices.
//    Sercom *sercom_instances[SERCOM_INST_NUM] = SERCOM_INSTS;
//    for (int i = 0; i < SERCOM_INST_NUM; i++) {
//        if (sercom_instances[i] == sercom) {
//            never_reset_sercoms[i] = false;
//            break;
//        }
//    }
//}
//
//void reset_sercoms(void) {
//    // Reset all SERCOMs except the ones being used by on-board devices.
//    Sercom *sercom_instances[SERCOM_INST_NUM] = SERCOM_INSTS;
//    for (int i = 0; i < SERCOM_INST_NUM; i++) {
//        if (never_reset_sercoms[i]) {
//            continue;
//        }
//    #ifdef MICROPY_HW_APA102_SERCOM
//        if (sercom_instances[i] == MICROPY_HW_APA102_SERCOM) {
//            continue;
//        }
//    #endif
//        // SWRST is same for all modes of SERCOMs.
//        sercom_instances[i]->SPI.CTRLA.bit.SWRST = 1;
//    }
//}

static void config_periph_pin(const mcu_periph_obj_t *periph) {
    IOMUXC_SetPinMux(
        periph->pin->mux_reg, periph->mux_mode,
        periph->input_reg, periph->input_idx,
        0,
        0);

    IOMUXC_SetPinConfig(0, 0, 0, 0,
        periph->pin->cfg_reg,
        IOMUXC_SW_PAD_CTL_PAD_HYS(0)
            | IOMUXC_SW_PAD_CTL_PAD_PUS(0)
            | IOMUXC_SW_PAD_CTL_PAD_PUE(0)
            | IOMUXC_SW_PAD_CTL_PAD_PKE(1)
            | IOMUXC_SW_PAD_CTL_PAD_ODE(0)
            | IOMUXC_SW_PAD_CTL_PAD_SPEED(2)
            | IOMUXC_SW_PAD_CTL_PAD_DSE(4)
            | IOMUXC_SW_PAD_CTL_PAD_SRE(0));
}

#define LPSPI_MASTER_CLK_FREQ (CLOCK_GetFreq(kCLOCK_Usb1PllPfd0Clk) / (CLOCK_GetDiv(kCLOCK_LpspiDiv)))

void common_hal_busio_spi_construct(busio_spi_obj_t *self,
        const mcu_pin_obj_t *clock, const mcu_pin_obj_t *mosi,
        const mcu_pin_obj_t *miso) {

    // TODO: Allow none mosi or miso

    const uint32_t sck_count = sizeof(mcu_spi_sck_list) / sizeof(mcu_periph_obj_t);
    const uint32_t miso_count = sizeof(mcu_spi_miso_list) / sizeof(mcu_periph_obj_t);
    const uint32_t mosi_count = sizeof(mcu_spi_mosi_list) / sizeof(mcu_periph_obj_t);

    for (uint32_t i = 0; i < sck_count; ++i) {
        if (mcu_spi_sck_list[i].pin != clock)
            continue;

        for (uint32_t j = 0; j < miso_count; ++j) {
            if (mcu_spi_miso_list[j].pin != miso)
                continue;

            if (mcu_spi_miso_list[j].bank_idx != mcu_spi_sck_list[i].bank_idx)
                continue;

            for (uint32_t k = 0; k < mosi_count; ++k) {
                if (mcu_spi_mosi_list[k].pin != mosi)
                    continue;

                if (mcu_spi_mosi_list[k].bank_idx != mcu_spi_miso_list[j].bank_idx)
                    continue;

                self->clock_pin = &mcu_spi_sck_list[i];
                self->miso_pin = &mcu_spi_miso_list[j];
                self->mosi_pin = &mcu_spi_mosi_list[k];

                break;
            }
        }
    }

    if(self->clock_pin == NULL || self->mosi_pin == NULL || self->miso_pin == NULL) {
        mp_raise_RuntimeError(translate("Invalid SPI pin selection"));
    } else {
        self->spi = mcu_spi_banks[self->clock_pin->bank_idx - 1];
    }

    config_periph_pin(self->mosi_pin);
    config_periph_pin(self->miso_pin);
    config_periph_pin(self->clock_pin);

    lpspi_master_config_t config = { 0 };
    LPSPI_MasterGetDefaultConfig(&config);

    // Always start at 250khz which is what SD cards need. They are sensitive to
    // SPI bus noise before they are put into SPI mode.
    config.baudRate = 250000;

    LPSPI_MasterInit(self->spi, &config, LPSPI_MASTER_CLK_FREQ);

    LPSPI_Enable(self->spi, false);
    uint32_t tcrPrescaleValue;
    self->baudrate = LPSPI_MasterSetBaudRate(self->spi, config.baudRate, LPSPI_MASTER_CLK_FREQ, &tcrPrescaleValue);
    LPSPI_Enable(self->spi, true);

    claim_pin(self->clock_pin->pin);

//    if (mosi_none) {
//        self->MOSI_pin = NO_PIN;
//    } else {
//        gpio_set_pin_direction(mosi->number, GPIO_DIRECTION_OUT);
//        gpio_set_pin_pull_mode(mosi->number, GPIO_PULL_OFF);
//        gpio_set_pin_function(mosi->number, mosi_pinmux);
//        self->MOSI_pin = mosi->number;
        claim_pin(self->mosi_pin->pin);
//    }

//    if (miso_none) {
//        self->MISO_pin = NO_PIN;
//    } else {
//        gpio_set_pin_direction(miso->number, GPIO_DIRECTION_IN);
//        gpio_set_pin_pull_mode(miso->number, GPIO_PULL_OFF);
//        gpio_set_pin_function(miso->number, miso_pinmux);
//        self->MISO_pin = miso->number;
        claim_pin(self->miso_pin->pin);
//    }
}

void common_hal_busio_spi_never_reset(busio_spi_obj_t *self) {
//    never_reset_sercom(self->spi_desc.dev.prvt);

//    never_reset_pin_number(self->clock_pin);
//    never_reset_pin_number(self->MOSI_pin);
//    never_reset_pin_number(self->MISO_pin);
}

bool common_hal_busio_spi_deinited(busio_spi_obj_t *self) {
    return self->clock_pin == NULL;
}

void common_hal_busio_spi_deinit(busio_spi_obj_t *self) {
    if (common_hal_busio_spi_deinited(self)) {
        return;
    }

//    allow_reset_sercom(self->spi_desc.dev.prvt);

//    spi_m_sync_disable(&self->spi_desc);
//    spi_m_sync_deinit(&self->spi_desc);
//    reset_pin_number(self->clock_pin);
//    reset_pin_number(self->MOSI_pin);
//    reset_pin_number(self->MISO_pin);
    self->clock_pin = NULL;
}

bool common_hal_busio_spi_configure(busio_spi_obj_t *self,
        uint32_t baudrate, uint8_t polarity, uint8_t phase, uint8_t bits) {
    lpspi_master_config_t config = { 0 };
    LPSPI_MasterGetDefaultConfig(&config);

    config.baudRate = baudrate;
    config.cpol = polarity;
    config.cpha = phase;
    config.bitsPerFrame = bits;

    LPSPI_Deinit(self->spi);
    LPSPI_MasterInit(self->spi, &config, LPSPI_MASTER_CLK_FREQ);

    LPSPI_Enable(self->spi, false);
    uint32_t tcrPrescaleValue;
    self->baudrate = LPSPI_MasterSetBaudRate(self->spi, config.baudRate, LPSPI_MASTER_CLK_FREQ, &tcrPrescaleValue);
    LPSPI_Enable(self->spi, true);

    return true;
}

bool common_hal_busio_spi_try_lock(busio_spi_obj_t *self) {
    bool grabbed_lock = false;
//    CRITICAL_SECTION_ENTER()
    if (!self->has_lock) {
        grabbed_lock = true;
        self->has_lock = true;
    }
//    CRITICAL_SECTION_LEAVE();
    return grabbed_lock;
}

bool common_hal_busio_spi_has_lock(busio_spi_obj_t *self) {
    return self->has_lock;
}

void common_hal_busio_spi_unlock(busio_spi_obj_t *self) {
    self->has_lock = false;
}

bool common_hal_busio_spi_write(busio_spi_obj_t *self,
        const uint8_t *data, size_t len) {
    if (len == 0) {
        return true;
    }

    lpspi_transfer_t xfer = { 0 };
    xfer.txData = (uint8_t*)data;
    xfer.dataSize = len;
    xfer.configFlags = kLPSPI_MasterPcs0;

    const status_t status = LPSPI_MasterTransferBlocking(self->spi, &xfer);
    if (status != kStatus_Success)
        printf("%s: status %ld\r\n", __func__, status);

    return (status == kStatus_Success);
}

bool common_hal_busio_spi_read(busio_spi_obj_t *self,
        uint8_t *data, size_t len, uint8_t write_value) {
    if (len == 0) {
        return true;
    }

    LPSPI_SetDummyData(self->spi, write_value);

    lpspi_transfer_t xfer = { 0 };
    xfer.rxData = data;
    xfer.dataSize = len;

    const status_t status = LPSPI_MasterTransferBlocking(self->spi, &xfer);
    if (status != kStatus_Success)
        printf("%s: status %ld\r\n", __func__, status);

    return (status == kStatus_Success);
}

bool common_hal_busio_spi_transfer(busio_spi_obj_t *self, uint8_t *data_out, uint8_t *data_in, size_t len) {
    if (len == 0) {
        return true;
    }

    LPSPI_SetDummyData(self->spi, 0xFF);

    lpspi_transfer_t xfer = { 0 };
    xfer.txData = data_out;
    xfer.rxData = data_in;
    xfer.dataSize = len;

    const status_t status = LPSPI_MasterTransferBlocking(self->spi, &xfer);
    if (status != kStatus_Success)
        printf("%s: status %ld\r\n", __func__, status);

    return (status == kStatus_Success);
}

uint32_t common_hal_busio_spi_get_frequency(busio_spi_obj_t* self) {
    return self->baudrate;
}

uint8_t common_hal_busio_spi_get_phase(busio_spi_obj_t* self) {
    return ((self->spi->TCR & LPSPI_TCR_CPHA_MASK) == LPSPI_TCR_CPHA_MASK);
}

uint8_t common_hal_busio_spi_get_polarity(busio_spi_obj_t* self) {
    return ((self->spi->TCR & LPSPI_TCR_CPOL_MASK) == LPSPI_TCR_CPOL_MASK);
}