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authorJosh Blum <josh@joshknows.com>2011-03-30 16:48:09 -0700
committerJosh Blum <josh@joshknows.com>2011-03-30 16:48:09 -0700
commit1d29ee1086620b7dc51dcdbcaaef2690d2e95dc6 (patch)
treee92bcd43d61ff3e2f48ca6c0ee1c00c39068a4db /host/lib/usrp/usrp1
parent48f6e1f8aae24ee4ff3b15232cfc335b0210ed11 (diff)
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usrp1: switch usrp1 iface to use spi read (transact never worked)
It detects the number of header bytes by searching for non-zero bytes.
Diffstat (limited to 'host/lib/usrp/usrp1')
-rw-r--r--host/lib/usrp/usrp1/usrp1_iface.cpp46
1 files changed, 29 insertions, 17 deletions
diff --git a/host/lib/usrp/usrp1/usrp1_iface.cpp b/host/lib/usrp/usrp1/usrp1_iface.cpp
index ea7c1cea5..8f10df751 100644
--- a/host/lib/usrp/usrp1/usrp1_iface.cpp
+++ b/host/lib/usrp/usrp1/usrp1_iface.cpp
@@ -175,24 +175,31 @@ public:
UHD_ASSERT_THROW((num_bits <= 32) && !(num_bits % 8));
size_t num_bytes = num_bits / 8;
- // Byteswap on num_bytes
- unsigned char buff[4] = { 0 };
- for (size_t i = 1; i <= num_bytes; i++)
- buff[num_bytes - i] = (bits >> ((i - 1) * 8)) & 0xff;
-
if (readback) {
- boost::uint8_t w_len_h = which_slave & 0xff;
- boost::uint8_t w_len_l = num_bytes & 0xff;
-
- int ret = _ctrl_transport->usrp_control_read(
- VRQ_SPI_TRANSACT,
- (buff[0] << 8) | (buff[1] << 0),
- (buff[2] << 8) | (buff[3] << 0),
- buff,
- (w_len_h << 8) | (w_len_l << 0));
-
- if (ret < 0) throw uhd::io_error("USRP1: failed SPI readback transaction");
-
+ unsigned char buff[4] = {
+ (bits >> 0) & 0xff, (bits >> 8) & 0xff,
+ (bits >> 16) & 0xff, (bits >> 24) & 0xff
+ };
+ //conditions where there are two header bytes
+ if (num_bytes >= 3 and buff[num_bytes-1] != 0 and buff[num_bytes-2] != 0 and buff[num_bytes-3] == 0){
+ if (int(num_bytes-2) != _ctrl_transport->usrp_control_read(
+ VRQ_SPI_READ, (buff[num_bytes-1] << 8) | (buff[num_bytes-2] << 0),
+ (which_slave << 8) | SPI_FMT_MSB | SPI_FMT_HDR_2,
+ buff, num_bytes-2
+ )) throw uhd::io_error("USRP1: failed SPI readback transaction");
+ }
+
+ //conditions where there is one header byte
+ else if (num_bytes >= 2 and buff[num_bytes-1] != 0 and buff[num_bytes-2] == 0){
+ if (int(num_bytes-1) != _ctrl_transport->usrp_control_read(
+ VRQ_SPI_READ, buff[num_bytes-1],
+ (which_slave << 8) | SPI_FMT_MSB | SPI_FMT_HDR_1,
+ buff, num_bytes-1
+ )) throw uhd::io_error("USRP1: failed SPI readback transaction");
+ }
+ else{
+ throw uhd::io_error("USRP1: invalid input data for SPI readback");
+ }
boost::uint32_t val = (((boost::uint32_t)buff[0]) << 0) |
(((boost::uint32_t)buff[1]) << 8) |
(((boost::uint32_t)buff[2]) << 16) |
@@ -200,6 +207,11 @@ public:
return val;
}
else {
+ // Byteswap on num_bytes
+ unsigned char buff[4] = { 0 };
+ for (size_t i = 1; i <= num_bytes; i++)
+ buff[num_bytes - i] = (bits >> ((i - 1) * 8)) & 0xff;
+
boost::uint8_t w_index_h = which_slave & 0xff;
boost::uint8_t w_index_l = (SPI_FMT_MSB | SPI_FMT_HDR_0) & 0xff;