3 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
25 * SPI Read/Write Utilities
32 /*-----------------------------------------------------------------------
37 # define MAX_SPI_BYTES 32 /* Maximum number of bytes we can handle */
41 * External table of chip select functions (see the appropriate board
42 * support for the actual definition of the table).
44 extern spi_chipsel_type spi_chipsel
[];
45 extern int spi_chipsel_cnt
;
48 * Values from last command.
52 static uchar dout
[MAX_SPI_BYTES
];
53 static uchar din
[MAX_SPI_BYTES
];
59 * spi {dev} {num_bits} {dout}
60 * {dev} is the device number for controlling chip select (see TBD)
61 * {num_bits} is the number of bits to send & receive (base 10)
62 * {dout} is a hexadecimal string of data to send
63 * The command prints out the hexadecimal string received via SPI.
66 int do_spi (cmd_tbl_t
*cmdtp
, int flag
, int argc
, char *argv
[])
74 * We use the last specified parameters, unless new ones are
78 if ((flag
& CMD_FLAG_REPEAT
) == 0)
81 device
= simple_strtoul(argv
[1], NULL
, 10);
83 bitlen
= simple_strtoul(argv
[2], NULL
, 10);
86 for(j
= 0; *cp
; j
++, cp
++) {
89 tmp
-= ('A' - '0') - 10;
93 printf("Hex conversion error on %c, giving up.\n", *cp
);
97 dout
[j
/ 2] = (tmp
<< 4);
104 if ((device
< 0) || (device
>= spi_chipsel_cnt
)) {
105 printf("Invalid device %d, giving up.\n", device
);
108 if ((bitlen
< 0) || (bitlen
> (MAX_SPI_BYTES
* 8))) {
109 printf("Invalid bitlen %d, giving up.\n", bitlen
);
113 debug ("spi_chipsel[%d] = %08X\n",
114 device
, (uint
)spi_chipsel
[device
]);
116 if(spi_xfer(spi_chipsel
[device
], bitlen
, dout
, din
) != 0) {
117 printf("Error with the SPI transaction.\n");
121 for(j
= 0; j
< ((bitlen
+ 7) / 8); j
++) {
122 printf("%02X", *cp
++);
130 /***************************************************/
134 "sspi - SPI utility commands\n",
135 "<device> <bit_len> <dout> - Send <bit_len> bits from <dout> out the SPI\n"
136 "<device> - Identifies the chip select of the device\n"
137 "<bit_len> - Number of bits to send (base 10)\n"
138 "<dout> - Hexadecimal string that gets sent\n"