72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
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/*
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* Copyright 2015 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* SPI transfer command for debugging SPI devices.
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*/
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#include "common.h"
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#include "console.h"
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#include "spi.h"
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#include "timer.h"
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#include "util.h"
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static int command_spixfer(int argc, char **argv)
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{
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int dev_id;
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uint8_t offset;
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int v = 0;
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uint8_t data[32];
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char *e;
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int rv = 0;
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if (argc != 5)
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return EC_ERROR_PARAM_COUNT;
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dev_id = strtoi(argv[2], &e, 0);
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if (*e)
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return EC_ERROR_PARAM2;
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offset = strtoi(argv[3], &e, 0);
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if (*e)
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return EC_ERROR_PARAM3;
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v = strtoi(argv[4], &e, 0);
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if (*e)
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return EC_ERROR_PARAM4;
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if (strcasecmp(argv[1], "rlen") == 0) {
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uint8_t cmd = 0x80 | offset;
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/* Arbitrary length read; param4 = len */
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if (v < 0 || v > sizeof(data))
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return EC_ERROR_PARAM4;
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rv = spi_transaction(&spi_devices[dev_id], &cmd, 1, data, v);
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if (!rv)
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ccprintf("Data: %.*h\n", v, data);
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} else if (strcasecmp(argv[1], "w") == 0) {
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/* 8-bit write */
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uint8_t cmd[2] = { offset, v };
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rv = spi_transaction(&spi_devices[dev_id], cmd, 2, NULL, 0);
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/*
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* Some SPI device needs a delay before accepting other
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* commands, otherwise the write might be ignored.
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*/
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msleep(1);
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} else {
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return EC_ERROR_PARAM1;
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}
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return rv;
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}
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DECLARE_CONSOLE_COMMAND(spixfer, command_spixfer,
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"rlen/w id offset [value | len]",
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"Read write spi. id is spi_devices array index");
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