37 lines
1.3 KiB
C
37 lines
1.3 KiB
C
// This file is part of the CircuitPython project: https://circuitpython.org
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//
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// SPDX-FileCopyrightText: Copyright (c) 2016, 2017, 2018 Scott Shawcroft for Adafruit Industries
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//
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// SPDX-License-Identifier: MIT
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#include "supervisor/spi_flash_api.h"
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#include "supervisor/shared/external_flash/common_commands.h"
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#include "supervisor/shared/external_flash/qspi_flash.h"
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void check_quad_enable(const external_flash_device *device) {
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if (device->quad_enable_bit_mask == 0x00) {
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return;
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}
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// Verify that QSPI mode is enabled.
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uint8_t status;
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if (device->single_status_byte) {
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spi_flash_read_command(CMD_READ_STATUS, &status, 1);
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} else {
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spi_flash_read_command(CMD_READ_STATUS2, &status, 1);
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}
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// Check the quad enable bit.
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if ((status & device->quad_enable_bit_mask) == 0) {
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uint8_t full_status[2] = {0x00, device->quad_enable_bit_mask};
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spi_flash_command(CMD_ENABLE_WRITE);
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if (device->write_status_register_split) {
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spi_flash_write_command(CMD_WRITE_STATUS_BYTE2, full_status + 1, 1);
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} else if (device->single_status_byte) {
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spi_flash_write_command(CMD_WRITE_STATUS_BYTE1, full_status + 1, 1);
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} else {
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spi_flash_write_command(CMD_WRITE_STATUS_BYTE1, full_status, 2);
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}
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}
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}
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