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 #if (CONFIG_COMMANDS & CFG_CMD_SPI)
34 /*-----------------------------------------------------------------------
39 # define MAX_SPI_BYTES 32 /* Maximum number of bytes we can handle */
43 * External table of chip select functions (see the appropriate board
44 * support for the actual definition of the table).
46 extern spi_chipsel_type spi_chipsel[];
47 extern int spi_chipsel_cnt;
50 * Values from last command.
54 static uchar dout[MAX_SPI_BYTES];
55 static uchar din[MAX_SPI_BYTES];
61 * spi {dev} {num_bits} {dout}
62 * {dev} is the device number for controlling chip select (see TBD)
63 * {num_bits} is the number of bits to send & receive (base 10)
64 * {dout} is a hexadecimal string of data to send
65 * The command prints out the hexadecimal string received via SPI.
68 int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
76 * We use the last specified parameters, unless new ones are
80 if ((flag & CMD_FLAG_REPEAT) == 0)
83 device = simple_strtoul(argv[1], NULL, 10);
85 bitlen = simple_strtoul(argv[2], NULL, 10);
88 for(j = 0; *cp; j++, cp++) {
91 tmp -= ('A' - '0') - 10;
95 printf("Hex conversion error on %c, giving up.\n", *cp);
99 dout[j / 2] = (tmp << 4);
106 if ((device < 0) || (device >= spi_chipsel_cnt)) {
107 printf("Invalid device %d, giving up.\n", device);
110 if ((bitlen < 0) || (bitlen > (MAX_SPI_BYTES * 8))) {
111 printf("Invalid bitlen %d, giving up.\n", bitlen);
115 debug ("spi_chipsel[%d] = %08X\n",
116 device, (uint)spi_chipsel[device]);
118 if(spi_xfer(spi_chipsel[device], bitlen, dout, din) != 0) {
119 printf("Error with the SPI transaction.\n");
123 for(j = 0; j < ((bitlen + 7) / 8); j++) {
124 printf("%02X", *cp++);
132 /***************************************************/
136 "sspi - SPI utility commands\n",
137 "<device> <bit_len> <dout> - Send <bit_len> bits from <dout> out the SPI\n"
138 "<device> - Identifies the chip select of the device\n"
139 "<bit_len> - Number of bits to send (base 10)\n"
140 "<dout> - Hexadecimal string that gets sent\n"
143 #endif /* CFG_CMD_SPI */