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prais.c
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prais.c
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/*
* Copyright (C) 2013 Nick Kossifidis
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/*
* prais.c - Support for Prais Coder mod. 735
* (and possibly 732 but haven't tested it)
*/
#include <stdint.h> /* For sized integers */
#include <errno.h> /* For error numbers */
#include <string.h> /* For memset() */
#include <stdio.h> /* For printf(...) */
#include <arpa/inet.h> /* For htons */
#include <termios.h> /* For tcflush() */
#include "rds.h"
#include "prais.h"
/**********************\
* DATA FORMAT HANDLING *
\**********************/
/**
* prais_get_frame_from_enc - Get a pending data frame from a Prais encoder
* @enc: pointer to &struct rds_encoder
* @data: pointer to a pre-allocated &struct prais_data_frame to fill
*/
static int
prais_get_frame_from_enc(struct rds_encoder *enc,
struct prais_data_frame *data)
{
unsigned char buf[PRAIS_DF_MAX_LEN];
struct prais_message *msg = &data->msg;
int ret = 0;
int i = 0;
int got_ack = 0;
uint16_t csum_calculated = 0;
uint16_t csum_received = 0;
char csum_ascii[2];
ret = rds_get_byte(enc);
if(ret < 0)
return -ENODATA;
/* Got a SYN, start processing */
if(ret == PRAIS_DL_SYN) {
/* Skip any extra SYNs */
while(ret == PRAIS_DL_SYN) {
ret = rds_get_byte(enc);
}
} else {
ret = -EPROTO;
goto finished;
}
/* Process ACK */
if(ret != PRAIS_DL_ACK) {
ret = -EPROTO;
goto finished;
}
ret = rds_get_byte(enc);
if(ret != PRAIS_DL_SYN) {
ret = -EPROTO;
goto finished;
}
got_ack = 1;
/*
* ACK only -> 0
* Frame following -> SYN
*/
ret = rds_get_byte(enc);
if(ret == 0) {
return 0;
} else if(ret != PRAIS_DL_SYN) {
ret = -EPROTO;
goto finished;
}
/* Process header */
rds_get_byte(enc); /* SYN */
ret = rds_get_byte(enc);
if(ret != PRAIS_DL_SOH) {
ret = -EPROTO;
goto finished;
}
/* Address field */
ret = rds_get_byte(enc);
if(ret < 0) {
ret = -EPROTO;
goto finished;
}
if(ret & (PRAIS_DF_NO_REPLY >> 8))
data->no_reply = 1;
enc->addr |= ret << 8;
ret = rds_get_byte(enc);
if(ret < 0) {
ret = -EPROTO;
goto finished;
}
enc->addr |= ret;
/* Sequence number */
ret = rds_get_byte(enc);
if((ret < 0x30) || (ret > 0x39)) {
ret = -EPROTO;
goto finished;
}
//enc->seq = ret - 0x30;
/*
* Header OK go for the message
* (and be a little more relaxed
* on the checks since we got here)
*/
rds_get_byte(enc); /* DLE */
rds_get_byte(enc); /* STX */
/* Message type */
ret = rds_get_byte(enc);
if((ret < PRAIS_MT_MIN_VAL) || (ret > PRAIS_MT_MAX_VAL)) {
ret = -EPROTO;
goto finished;
}
msg->type = ret;
csum_calculated += ret;
/* Message length */
ret = rds_get_byte(enc);
if((ret < 0) || (ret > PRAIS_MT_MAX_LEN)) {
ret = -EPROTO;
goto finished;
}
msg->len = ret;
csum_calculated += ret;
/* Message data */
for(i = 0; i < msg->len; i++) {
ret = rds_get_byte(enc);
/* Escaped character */
if(ret == PRAIS_DL_DLE) {
ret = rds_get_byte(enc);
csum_calculated += ret;
}
if(ret < 0) {
ret = -EPROTO;
goto finished;
}
msg->data[i] = ret;
csum_calculated += ret;
}
rds_get_byte(enc); /* DLE */
rds_get_byte(enc); /* ETX */
/* Checksum is one byte sent as 2 ASCII
* chars, so if checksum is e.g. 0x123
* 0x23 is sent as '2''3' or 0x32 0x33 */
csum_ascii[0] = rds_get_byte(enc);
csum_ascii[1] = rds_get_byte(enc);
for(i = 0; i < 2; i++) {
if(csum_ascii[i] >= 0x41)
csum_ascii[i] = csum_ascii[i] - 0x41 + 0xA;
else if(csum_ascii[i] >= 0x30)
csum_ascii[i] -= 0x30;
}
csum_received |= (csum_ascii[0] & 0xF) << 4;
csum_received |= (csum_ascii[1] & 0xF);
rds_get_byte(enc); /* SYN */
/* If checksum doesn't fit in a byte
* throw away the higher bits */
csum_calculated &= 0xFF;
if(csum_received != csum_calculated)
ret = -EPROTO;
else
ret = msg->len;
finished:
tcflush(enc->serial_fd, TCIFLUSH);
return ret;
}
/**
* prais_send_frame_to_enc - Send a data frame to a Prais encoder
* @enc: pointer to &struct rds_encoder
* @data: pointer to the &struct prais_data_frame to send
*/
static int
prais_send_frame_to_enc(struct rds_encoder *enc,
struct prais_data_frame *data)
{
unsigned char buf[PRAIS_DF_MAX_LEN];
int len = 0;
uint8_t csum_char = 0;
data->msg.checksum = 0;
/* Add the no reply flag if needed */
if(data->no_reply)
enc->addr |= PRAIS_DF_NO_REPLY;
/* Start header with two SYNs and SOH */
rds_send_byte(enc, PRAIS_DL_SYN);
rds_send_byte(enc, PRAIS_DL_SYN);
rds_send_byte(enc, PRAIS_DL_SOH);
/* Send address and sequence number as ASCII text */
rds_send_byte(enc, (enc->addr & 0xFF00) >> 8);
rds_send_byte(enc, enc->addr & 0x00FF);
rds_send_byte(enc, enc->seq + 0x30);
/* Send DLE and STX to mark msg start */
rds_send_byte(enc, PRAIS_DL_DLE);
rds_send_byte(enc, PRAIS_DL_STX);
/* Send mesage type, length and body, in case
* a byte is the same as DLE, escape it by
* adding a DLE before it (so output 2 DLEs) */
rds_send_byte(enc, data->msg.type);
data->msg.checksum += data->msg.type;
rds_send_byte(enc, data->msg.len);
data->msg.checksum += data->msg.len;
for(len = 0; len < data->msg.len && len < PRAIS_MT_MAX_LEN; len++) {
if(data->msg.data[len] == 0x10) {
rds_send_byte(enc, PRAIS_DL_DLE);
data->msg.checksum += PRAIS_DL_DLE;
}
rds_send_byte(enc, data->msg.data[len]);
data->msg.checksum += data->msg.data[len];
}
/* Send DLE and ETX to mark msg end */
rds_send_byte(enc, PRAIS_DL_DLE);
rds_send_byte(enc, PRAIS_DL_ETX);
/* Calculate checksum: grab the LSB of checksum
* and send it out as ASCII text */
csum_char = (data->msg.checksum & 0xF0) >> 4;
if(csum_char >= 10)
csum_char = (csum_char % 10) + 0x41;
else
csum_char = csum_char + 0x30;
rds_send_byte(enc, csum_char);
csum_char = data->msg.checksum & 0x0F;
if(csum_char >= 10)
csum_char = (csum_char % 10) + 0x41;
else
csum_char = csum_char + 0x30;
rds_send_byte(enc, csum_char);
/* Finaly send a SYNC to end the message */
rds_send_byte(enc, PRAIS_DL_SYN);
/* And increase the sequence counter */
if(enc->seq < 9)
enc->seq++;
else
enc->seq = 0; /* Reset */
/* Prais's programm sends 1220 (4c4) ETXes
* when broadcasting or on satelite mode.
* It looks like they wanted to give some
* time to the device to process it since
* there is no feedback or something like
* that. It's crap, I'll leave it to 64
* and if you see any issues, increase it.
*/
if(data->no_reply)
for(len = 0; len < 64; len++)
rds_send_byte(enc, PRAIS_DL_ETX);
}
/**
* prais_send_ack_to_enc - Send an ACK frame to a Prais encoder
* @enc: pointer to &struct rds_encoder
*/
static int
prais_send_ack_to_enc(struct rds_encoder *enc)
{
rds_send_byte(enc, PRAIS_DL_SYN);
rds_send_byte(enc, PRAIS_DL_SYN);
rds_send_byte(enc, PRAIS_DL_ACK);
rds_send_byte(enc, PRAIS_DL_SYN);
rds_send_byte(enc, 0);
return 0;
}
/*****************\
* COMMAND HELPERS *
\*****************/
/**
* prais_get_tamsdi - Request TAMSDI field on a Prais encoder
*
* Since TAMSDI field holds more than one fields
* we want to get/set indepentently, this function
* is used internaly, mostly to preserve TAMSDI
* settings when chaning only TA, MS, DI or dynamic PTY
*
* @enc: pointer to &struct rds_encoder
*
* Returns: tamsdi on success or -errno
*/
static int
prais_get_tamsdi(struct rds_encoder *enc)
{
struct prais_data_frame request;
struct prais_message *msg = &request.msg;
struct prais_data_frame reply;
uint8_t tamsdi = 0;
int ret = 0;
memset(&request, 0, sizeof(struct prais_data_frame));
request.no_reply = 0;
msg->type = PRAIS_MT_TAMSDI;
msg->len = 0;
ret = prais_send_frame_to_enc(enc, &request);
if(ret < 0)
return ret;
ret = prais_get_frame_from_enc(enc, &reply);
if(ret < 0)
return ret;
prais_send_ack_to_enc(enc);
tamsdi = reply.msg.data[0];
return tamsdi & 0x7F; /* Ignore the msb */
}
/**
* prais_get_rt_status - Get RT transmission status of a Prais encoder
* @enc: pointer to &struct rds_encoder
* Returns: 0 -> Ready to send, 1 -> Transmission pending
*/
static int
prais_get_rt_status(struct rds_encoder *enc)
{
struct prais_data_frame data_frame;
struct prais_message *msg = &data_frame.msg;
struct prais_data_frame reply;
int ret = 0;
memset(&data_frame, 0, sizeof(struct prais_data_frame));
if(enc->addr == PRAIS_DF_ADDR_BCAST)
return -EOPNOTSUPP;
msg->type = PRAIS_MT_RT;
msg->len = 0;
prais_send_frame_to_enc(enc, &data_frame);
ret = prais_get_frame_from_enc(enc, &reply);
if(ret < 0)
return ret;
prais_send_ack_to_enc(enc);
ret = reply.msg.data[0];
return ret;
}
/**
* prais_set_rt_mode - Set RT transmission state on a Prais encoder
* @enc: pointer to &struct rds_encoder
* @mode: 0 -> Reset (?), 1 -> Send with method A, 2 -> Send with method B
*/
static int
prais_set_rt_mode(struct rds_encoder *enc, uint8_t mode)
{
struct prais_data_frame data_frame;
struct prais_message *msg = &data_frame.msg;
struct prais_data_frame reply;
int ret = 0;
memset(&data_frame, 0, sizeof(struct prais_data_frame));
if(enc->addr == PRAIS_DF_ADDR_BCAST)
return -EOPNOTSUPP;
if(mode == 0) {
msg->type = PRAIS_MT_RT;
msg->len = 1;
msg->data[0] = 0;
prais_send_frame_to_enc(enc, &data_frame);
ret = prais_get_frame_from_enc(enc, &reply);
if(ret < 0)
return ret;
prais_send_ack_to_enc(enc);
} else if(mode == 1) {
msg->type = PRAIS_MT_RT;
msg->len = 2;
msg->data[0] = 0;
msg->data[1] = 0;
prais_send_frame_to_enc(enc, &data_frame);
ret = prais_get_frame_from_enc(enc, &reply);
if(ret < 0)
return ret;
prais_send_ack_to_enc(enc);
msg->type = PRAIS_MT_RT;
msg->len = 1;
msg->data[0] = 1;
prais_send_frame_to_enc(enc, &data_frame);
ret = prais_get_frame_from_enc(enc, &reply);
if(ret < 0)
return ret;
prais_send_ack_to_enc(enc);
} else if(mode == 2) {
msg->type = PRAIS_MT_RT;
msg->len = 2;
msg->data[0] = 0;
msg->data[1] = 0x40;
prais_send_frame_to_enc(enc, &data_frame);
ret = prais_get_frame_from_enc(enc, &reply);
if(ret < 0)
return ret;
prais_send_ack_to_enc(enc);
msg->type = PRAIS_MT_RT;
msg->len = 1;
msg->data[0] = 2;
prais_send_frame_to_enc(enc, &data_frame);
ret = prais_get_frame_from_enc(enc, &reply);
if(ret < 0)
return ret;
prais_send_ack_to_enc(enc);
}
ret = reply.msg.data[0];
return ret;
}
/**
* prais_store - Store data on a Prais encoder (WiP)
* @enc: pointer to &struct rds_encoder
*
* The vendor's utility applies most config options
* (together with dynamic PS group messages etc) in one
* step, instead of giving the option to tweak them one
* by one. At the end of this step this command is issued
* to store data on the device. It's not used here (yet)
*/
static int
prais_store(struct rds_encoder *enc)
{
struct prais_data_frame data_frame;
struct prais_message *msg = &data_frame.msg;
struct prais_data_frame reply;
int ret = 0;
memset(&data_frame, 0, sizeof(struct prais_data_frame));
if(enc->addr == PRAIS_DF_ADDR_BCAST)
return -EOPNOTSUPP;
msg->type = PRAIS_MT_STORE;
msg->len = 0;
prais_send_frame_to_enc(enc, &data_frame);
ret = prais_get_frame_from_enc(enc, &reply);
if(ret < 0)
return ret;
prais_send_ack_to_enc(enc);
ret = reply.msg.data[0];
return ret;
}
/**
* prais_reset - Reset a Prais encoder (?)
* @enc: pointer to &struct rds_encoder
*
* XXX: Got this through binary analysis of the
* vendor's application. When sent, the unit replies
* but nothing happens (nothing is reset). Need to
* investigate this further.
*/
static int
prais_reset(struct rds_encoder *enc)
{
struct prais_data_frame data_frame;
struct prais_message *msg = &data_frame.msg;
struct prais_data_frame reply;
int ret = 0;
memset(&data_frame, 0, sizeof(struct prais_data_frame));
if(enc->addr == PRAIS_DF_ADDR_BCAST)
return -EOPNOTSUPP;
msg->type = PRAIS_MT_RESET;
msg->len = 0;
prais_send_frame_to_enc(enc, &data_frame);
ret = prais_get_frame_from_enc(enc, &reply);
if(ret < 0)
return ret;
prais_send_ack_to_enc(enc);
ret = reply.msg.data[0];
return ret;
}
/**********\
* COMMANDS *
\**********/
/**
* prais_get_pi - Get Programme Identifier information of a Prais encoder
* @enc: pointer to &struct rds_encoder
* @dsn: 0 (only one Programme supported)
* @psn: 0 (only one Programme supported)
* @pi: pointer to &struct rds_pi to fill
*/
static int
prais_get_pi(struct rds_encoder *enc, uint8_t dsn, uint8_t psn, struct rds_pi *pi)
{
struct prais_data_frame request;
struct prais_message *msg = &request.msg;
struct prais_data_frame reply;
int ret = 0;
/* Only one active programme is supported */
if(dsn != 0 || psn != 0 || (enc->addr == PRAIS_DF_ADDR_BCAST))
return -EOPNOTSUPP;
memset(&request, 0, sizeof(struct prais_data_frame));
memset(&reply, 0, sizeof(struct prais_data_frame));
memset(pi, 0, sizeof(struct rds_pi));
msg->type = PRAIS_MT_PI;
msg->len = 0;
ret = prais_send_frame_to_enc(enc, &request);
if(ret < 0)
return ret;
prais_get_frame_from_enc(enc, &reply);
if(ret < 0)
return ret;
prais_send_ack_to_enc(enc);
pi->ccode = reply.msg.data[2] & 0xFF; /* ECC */
pi->ccode |= ((reply.msg.data[0] & 0xF0) >> 4) << 8;
pi->coverage = reply.msg.data[0] & 0x0F;
pi->prn = reply.msg.data[1];
return 0;
}
/**
* prais_set_pi - Set Programme Identifier information on a Prais encoder
* @enc: pointer to &struct rds_encoder
* @dsn: 0 (only one Programme supported)
* @psn: 0 (only one Programme supported)
* @pi: pointer to &struct rds_pi containing the infos
*/
static int
prais_set_pi(struct rds_encoder *enc, uint8_t dsn, uint8_t psn, struct rds_pi *pi)
{
struct prais_data_frame data_frame;
struct prais_message *msg = &data_frame.msg;
struct prais_data_frame reply;
uint8_t pi_country = 0;
uint8_t pi_ecc = 0;
int ret = 0;
/* Only one active programme is supported */
if(dsn != 0 || psn != 0)
return -EOPNOTSUPP;
memset(&data_frame, 0, sizeof(struct prais_data_frame));
memset(&reply, 0, sizeof(struct prais_data_frame));
if(enc->addr == PRAIS_DF_ADDR_BCAST)
data_frame.no_reply = 1;
pi_country = (pi->ccode & 0x0F00) >> 8;
pi_ecc = (pi->ccode & 0x00FF);
msg->type = PRAIS_MT_PI;
msg->len = 3;
msg->data[0] = (pi_country << 4) | pi->coverage & 0x0F;
msg->data[1] = pi->prn;
msg->data[2] = pi_ecc;
ret = prais_send_frame_to_enc(enc, &data_frame);
if(ret < 0)
return ret;
if(data_frame.no_reply != 1) {
ret = prais_get_frame_from_enc(enc, &reply);
prais_send_ack_to_enc(enc);
}
return ret;
}
/**
* prais_get_ps - Get Programme Service name of a Prais encoder
* @enc: pointer to &struct rds_encoder
* @dsn: message group (1-2)
* @psn: message id (0-14) (only one supported so always 0)
* @ps: a pre-allocated 8byte char array to fill
*/
static int
prais_get_ps(struct rds_encoder *enc, uint8_t dsn, uint8_t psn, char* ps)
{
struct prais_data_frame request;
struct prais_message *msg = &request.msg;
struct prais_data_frame reply;
int i = 0;
int fields = 0;
int ret = 0;
memset(&request, 0, sizeof(struct prais_data_frame));
memset(&reply, 0, sizeof(struct prais_data_frame));
/* Only one programme is supported by the device
* and only one message per programme is supported by
* this library */
if(psn != 0 || dsn > 2 || (enc->addr == PRAIS_DF_ADDR_BCAST))
return -EOPNOTSUPP;
msg->type = PRAIS_MT_PS;
msg->len = 2;
msg->data[0] = 1;
msg->data[1] = psn | ((dsn == 2) ? PRAIS_PSN_INDEX_GROUP2 : 0);
ret = prais_send_frame_to_enc(enc, &request);
if(ret < 0)
return ret;
ret = prais_get_frame_from_enc(enc, &reply);
if(ret < 0)
return ret;
prais_send_ack_to_enc(enc);
msg = &reply.msg;
/* On empty message only the index field
* is present */
fields = (msg->len < 3) ? 1 : 2;
for(i = 0; i < msg->len - fields; i++)
ps[i] = msg->data[i + fields];
return i;
}
/**
* prais_set_ps - Set Programme Service name on a Prais encoder
* @enc: pointer to &struct rds_encoder
* @dsn: message group (1-2)
* @psn: message id (0-14) (only one supported so always 0)
* @ps: PS name to set
*/
static int
prais_set_ps(struct rds_encoder *enc, uint8_t dsn, uint8_t psn, char* ps)
{
struct prais_data_frame data_frame;
struct prais_message *msg = &data_frame.msg;
struct prais_data_frame reply;
int i = 0;
int len = 0;
int pslen = 0;
int ret = 0;
memset(&data_frame, 0, sizeof(struct prais_data_frame));
memset(&reply, 0, sizeof(struct prais_data_frame));
if(((psn != 0) && !(enc->flags & RDS_ENCODER_FLAGS_PRAIS_HW_DYNPS)) ||
((psn > 14) && (enc->flags & RDS_ENCODER_FLAGS_PRAIS_HW_DYNPS))
|| (dsn > 2))
return -EOPNOTSUPP;
if(enc->addr == PRAIS_DF_ADDR_BCAST)
data_frame.no_reply = 1;
pslen = strnlen(ps, 9); /* 8 + null */
msg->type = PRAIS_MT_PS;
msg->len = 11; /* Even on empty messages it's filled with spaces */
/* 0 -> set, 1 -> request, 2 -> disable,
* not present on reply */
msg->data[len++] = (pslen < 1) ? 2 : 0;
/* Index 0 - 15, or with the flag above to
* refer to the 2nd group */
msg->data[len++] = psn | ((dsn == 2) ? PRAIS_PSN_INDEX_GROUP2 : 0);
/* Duration 0 - 100
* It's 0xFF when message disable is requested */
msg->data[len++] = (pslen < 1) ? 0xFF :
((enc->flags & RDS_ENCODER_FLAGS_PRAIS_HW_DYNPS) && (psn == 0)) ? 10 :
(enc->flags & RDS_ENCODER_FLAGS_PRAIS_HW_DYNPS) ? 4 : 00;
/* P.S. is 8 chars long */
for(i = 0; i < pslen; i++) {
/* Non-ASCII character */
if (ps[i] < 0x20 || ps[i] > 0x7E)
msg->data[len++] = ' ';
else
msg->data[len++] = ps[i];
}
/* If given P.S. is less than 8 chars, pad it
* with spaces -also for empty/disabled- */
while(i < 8) {
msg->data[len++] = ' ';
i++;
}
ret = prais_send_frame_to_enc(enc, &data_frame);
if(ret < 0)
return ret;
if(data_frame.no_reply != 1) {
ret = prais_get_frame_from_enc(enc, &reply);
prais_send_ack_to_enc(enc);
}
return ret;
}
/**
* prais_manipulator_rt - Replicates message as many times at it fits to the rt buffer
* @msg: The message to be manipulated
*/
static void
prais_manipulator_rt(char* msg)
{
size_t len;
int times;
int segment_size;
int i;
len = strlen(msg);
segment_size = len + PRAIS_RT_SPACE_LENGTH;
times = (RDS_RT_MSG_LEN_MAX - 1) / segment_size;
/* optional */
if(times < 2) return;
memset(msg + len, ' ', (RDS_RT_MSG_LEN_MAX - 1) - len);
for(i = 1; i < times; ++i)
{
memcpy(msg + i * segment_size, msg, segment_size);
}
}
/**
* prais_set_rt - Set RadioText message on a Prais encoder
* @enc: pointer to &struct rds_encoder
* @dsn: 0 (only one Programme supported)
* @psn: 0 (only one Programme supported)
* @rt: the &struct rds_rt to send
*
* XXX: WiP...
*/
static int
prais_set_rt(struct rds_encoder *enc, uint8_t dsn, uint8_t psn, struct rds_rt *rt)
{
struct prais_data_frame data_frame;
struct prais_message *msg = &data_frame.msg;
struct prais_data_frame reply;
int ret = 0;
int i = 0;
int c = 0;
int j = 0;
int k = 0;
memset(&data_frame, 0, sizeof(struct prais_data_frame));
if(enc->addr == PRAIS_DF_ADDR_BCAST)
return -EOPNOTSUPP;
if(rt->buffer_config == RDS_RT_BUFF_CONFIG_APPEND)
return -EOPNOTSUPP;
else if(rt->buffer_config == RDS_RT_BUFF_CONFIG_FLUSH && strlen(rt->msg) == 0)
return prais_set_rt_mode(enc, 0);
enc->seq = 0;
/* If active, disable it */
ret = prais_get_rt_status(enc);
if(ret < 0)
return ret;
/* Pending RT transmission <- WTF ? */
if(ret == 1)
return -EAGAIN;
/* Set to inactive */
ret = prais_set_rt_mode(enc, 0);
if(ret < 0)
return ret;
/* Manipulate message */
prais_manipulator_rt(rt->msg);
for(k = 0; k < 4; k++) {
for(i = 0; i < 16; i++) {
msg->type = PRAIS_MT_RT;
msg->len = 4;
c = 4 * i;
for(j = 0; j < 4; j++, c++) {
/* Non-ASCII character */
if (rt->msg[c] < 0x20 || rt->msg[c] > 0x7E) {
msg->data[j] = ' ';
} else
msg->data[j] = rt->msg[c];
}
prais_send_frame_to_enc(enc, &data_frame);
ret = prais_get_frame_from_enc(enc, &reply);
if(ret < 0)
return ret;
prais_send_ack_to_enc(enc);
ret = reply.msg.data[0];
}
}
/* Enable RadioText */
ret = prais_set_rt_mode(enc, 1);
if(ret < 0)
return ret;
return ret;
}
/**
* prais_get_di - Get decoder info field of a Prais encoder
* @enc: pointer to &struct rds_encoder
* @dsn: 0 (only one Programme supported)
* @psn: 0 (only one Programme supported)
*/
static int
prais_get_di(struct rds_encoder *enc, uint8_t dsn, uint8_t psn)
{
int tamsdi = 0;
int di = 0;
if((enc->addr == PRAIS_DF_ADDR_BCAST)||
(dsn != 0 || psn != 0))
return -EOPNOTSUPP;
tamsdi = prais_get_tamsdi(enc);
if(tamsdi < 0)
return tamsdi;
tamsdi &= PRAIS_TAMSDI_DI_MASK;
if(tamsdi & PRAIS_TAMSDI_DI_STEREO)
di = RDS_DI_STEREO;
if(tamsdi & PRAIS_TAMSDI_DI_ART_HEAD)
di |= RDS_DI_ARTIFICIAL_HEAD;
if(tamsdi & PRAIS_TAMSDI_DI_COMPRESSED)
di |= RDS_DI_COMPRESSED;
return di & 0x07;
}
/**
* prais_set_di - Set decoder info field on a Prais encoder
* @enc: pointer to &struct rds_encoder
* @dsn: 0 (only one Programme supported)
* @psn: 0 (only one Programme supported)
* @di: RDS_DI_* status flags
*/
static int
prais_set_di(struct rds_encoder *enc, uint8_t dsn, uint8_t psn, uint8_t di)
{
struct prais_data_frame data_frame;
struct prais_message *msg = &data_frame.msg;
struct prais_data_frame reply;
int tamsdi = 0;
int ret = 0;
/* Only one active programme is supported */
if(dsn != 0 || psn != 0)
return -EOPNOTSUPP;
memset(&data_frame, 0, sizeof(struct prais_data_frame));
memset(&reply, 0, sizeof(struct prais_data_frame));
if(enc->addr != PRAIS_DF_ADDR_BCAST) {
/* Get the current TAMSDI flag so that we only mess with
* the TA flag and keep the rest as is */
tamsdi = prais_get_tamsdi(enc);
if(tamsdi < 0)
return tamsdi;
/* Reset DI field */
tamsdi &= ~PRAIS_TAMSDI_DI_MASK;
if(di & RDS_DI_STEREO)
tamsdi |= PRAIS_TAMSDI_DI_STEREO;
if(di & RDS_DI_ARTIFICIAL_HEAD)
tamsdi |= PRAIS_TAMSDI_DI_ART_HEAD;
if(di & RDS_DI_COMPRESSED)
tamsdi |= PRAIS_TAMSDI_DI_COMPRESSED;
} else
data_frame.no_reply = 1;
msg->type = PRAIS_MT_TAMSDI;
msg->len = 1;
msg->data[0] = tamsdi;
ret = prais_send_frame_to_enc(enc, &data_frame);
if(ret < 0)
return ret;
if(data_frame.no_reply != 1) {
ret = prais_get_frame_from_enc(enc, &reply);
prais_send_ack_to_enc(enc);
}
return ret;
}