]>
git.ipfire.org Git - people/ms/u-boot.git/blob - common/cmd_spi.c
3 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
5 * SPDX-License-Identifier: GPL-2.0+
9 * SPI Read/Write Utilities
16 /*-----------------------------------------------------------------------
21 # define MAX_SPI_BYTES 32 /* Maximum number of bytes we can handle */
24 #ifndef CONFIG_DEFAULT_SPI_BUS
25 # define CONFIG_DEFAULT_SPI_BUS 0
27 #ifndef CONFIG_DEFAULT_SPI_MODE
28 # define CONFIG_DEFAULT_SPI_MODE SPI_MODE_0
32 * Values from last command.
34 static unsigned int bus
;
35 static unsigned int cs
;
36 static unsigned int mode
;
38 static uchar dout
[MAX_SPI_BYTES
];
39 static uchar din
[MAX_SPI_BYTES
];
45 * spi {dev} {num_bits} {dout}
46 * {dev} is the device number for controlling chip select (see TBD)
47 * {num_bits} is the number of bits to send & receive (base 10)
48 * {dout} is a hexadecimal string of data to send
49 * The command prints out the hexadecimal string received via SPI.
52 int do_spi (cmd_tbl_t
*cmdtp
, int flag
, int argc
, char * const argv
[])
54 struct spi_slave
*slave
;
61 * We use the last specified parameters, unless new ones are
65 if ((flag
& CMD_FLAG_REPEAT
) == 0)
68 mode
= CONFIG_DEFAULT_SPI_MODE
;
69 bus
= simple_strtoul(argv
[1], &cp
, 10);
71 cs
= simple_strtoul(cp
+1, &cp
, 10);
74 bus
= CONFIG_DEFAULT_SPI_BUS
;
77 mode
= simple_strtoul(cp
+1, NULL
, 10);
80 bitlen
= simple_strtoul(argv
[2], NULL
, 10);
83 for(j
= 0; *cp
; j
++, cp
++) {
86 tmp
-= ('A' - '0') - 10;
90 printf("Hex conversion error on %c\n", *cp
);
94 dout
[j
/ 2] = (tmp
<< 4);
101 if ((bitlen
< 0) || (bitlen
> (MAX_SPI_BYTES
* 8))) {
102 printf("Invalid bitlen %d\n", bitlen
);
106 slave
= spi_setup_slave(bus
, cs
, 1000000, mode
);
108 printf("Invalid device %d:%d\n", bus
, cs
);
112 spi_claim_bus(slave
);
113 if(spi_xfer(slave
, bitlen
, dout
, din
,
114 SPI_XFER_BEGIN
| SPI_XFER_END
) != 0) {
115 printf("Error during SPI transaction\n");
118 for(j
= 0; j
< ((bitlen
+ 7) / 8); j
++) {
119 printf("%02X", din
[j
]);
123 spi_release_bus(slave
);
124 spi_free_slave(slave
);
129 /***************************************************/
133 "SPI utility command",
134 "[<bus>:]<cs>[.<mode>] <bit_len> <dout> - Send and receive bits\n"
135 "<bus> - Identifies the SPI bus\n"
136 "<cs> - Identifies the chip select\n"
137 "<mode> - Identifies the SPI mode to use\n"
138 "<bit_len> - Number of bits to send (base 10)\n"
139 "<dout> - Hexadecimal string that gets sent"