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https://github.com/eried/portapack-mayhem.git
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RDS radiotext and time group generators
This commit is contained in:
furrtek
parent
28ea2179f4
commit
843c465c73
4 changed files with 111 additions and 40 deletions
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@ -24,19 +24,24 @@
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#include "portapack_shared_memory.hpp"
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// RDS infos:
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// One group = 4 blocks = 4 * 26 bits
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// One block = 26 bits (16 bits data + 10 bits checkword)
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// Sent MSB first
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namespace rds {
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uint32_t makeblock(uint32_t blockdata, uint16_t offset) {
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uint32_t makeblock(uint32_t data, uint16_t offset) {
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uint16_t CRC = 0;
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uint8_t doinv;
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uint8_t bit;
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for (uint8_t i = 0; i < 16; i++) {
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doinv = (((blockdata << i) & 0x8000) >> 15) ^ (CRC >> 9);
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if (doinv) CRC ^= 0b0011011100;
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CRC = ((CRC << 1) | doinv) & 0x3FF;
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bit = (((data << i) & 0x8000) >> 15) ^ (CRC >> 9);
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if (bit) CRC ^= 0b0011011100;
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CRC = ((CRC << 1) | bit) & 0x3FF;
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}
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return (blockdata << 10) | (CRC ^ offset);
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return (data << 10) | (CRC ^ offset);
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}
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// Todo:
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@ -52,35 +57,50 @@ uint8_t b2b(const bool in) {
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return 0;
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}
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void make_0B_group(uint32_t group[], const uint16_t PI_code, const bool TP, const uint8_t PTY, const bool TA,
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// Type 0B groups are like 0A groups but without alternative frequency data
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void make_0B_group(uint32_t blocks[], const uint16_t PI_code, const bool TP, const uint8_t PTY, const bool TA,
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const bool MS, const bool DI, const uint8_t C, const char * chars) {
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group[0] = PI_code;
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group[1] = (0x0 << 12) | (1 << 11) | (b2b(TP) << 10) | (PTY << 5) | (b2b(TA) << 4) | (b2b(MS) << 3) | (b2b(DI) << 2) | (C & 3);
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group[2] = PI_code;
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group[3] = (chars[0] << 8) | chars[1];
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blocks[0] = PI_code;
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blocks[1] = (0x0 << 12) | (1 << 11) | (b2b(TP) << 10) | ((PTY & 0x1F) << 5) | (b2b(TA) << 4) | (b2b(MS) << 3) | (b2b(DI) << 2) | (C & 3);
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blocks[2] = PI_code;
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blocks[3] = (chars[0] << 8) | chars[1];
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}
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void make_2A_group(uint32_t group[], const uint16_t PI_code, const bool TP, const uint8_t PTY, const bool AB,
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// For RadioText, up to 64 chars with 2A, 32 chars with 2B
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void make_2A_group(uint32_t blocks[], const uint16_t PI_code, const bool TP, const uint8_t PTY, const bool AB,
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const uint8_t segment, const char * chars) {
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group[0] = PI_code;
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group[1] = (0x0 << 12) | (1 << 11) | (b2b(TP) << 10) | (PTY << 5) | (b2b(AB) << 4) | (segment & 15);
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group[2] = (chars[0] << 8) | chars[1];
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group[3] = (chars[2] << 8) | chars[3];
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blocks[0] = PI_code;
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blocks[1] = (0x2 << 12) | (0 << 11) | (b2b(TP) << 10) | ((PTY & 0x1F) << 5) | (b2b(AB) << 4) | (segment & 15);
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blocks[2] = (chars[0] << 8) | chars[1];
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blocks[3] = (chars[2] << 8) | chars[3];
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}
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uint16_t gen_PSN(const char * psname, const uint8_t pty) {
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// Time and date - usually one message per minute - Month: 1~12 - Day: 1~31 - Hour/Minute: 0~59 - Local offset: -12/+12 from UTC
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void make_4A_group(uint32_t blocks[], const uint16_t PI_code, const bool TP, const uint8_t PTY,
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const uint16_t year, const uint8_t month, const uint8_t day,
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const uint8_t hour, const uint8_t minute, const int8_t local_offset) {
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uint32_t L = 0;
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uint32_t day_code;
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if ((month == 1) || (month == 2)) L = 1;
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day_code = 14956 + day + (uint32_t)((float)(year - L) * 365.25) + uint16_t(((month + 1) * L * 12) * 30.6001);
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blocks[0] = PI_code;
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blocks[1] = (0x4 << 12) | (0 << 11) | (b2b(TP) << 10) | ((PTY & 0x1F) << 5) | ((day_code & 0x18000) >> 15);
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blocks[2] = ((day_code & 0x7FFF) << 1) | (hour >> 4);
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blocks[3] = ((hour & 15) << 12) | ((minute & 0x3F) << 6) | (local_offset & 0x3F);
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}
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uint16_t gen_PSN(const char * psname, const RDS_flags * rds_flags) {
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uint8_t c;
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uint32_t group[4][4] = { 0 };
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// 4 groups with 2 PSN characters in each
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make_0B_group(&group[0][0], 0xF849, true, pty, false, true, false, 0, &psname[0]);
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make_0B_group(&group[1][0], 0xF849, true, pty, false, true, false, 1, &psname[2]);
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make_0B_group(&group[2][0], 0xF849, true, pty, false, true, false, 2, &psname[4]);
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make_0B_group(&group[3][0], 0xF849, true, pty, false, true, false, 3, &psname[6]);
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for (c = 0; c < 4; c++)
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make_0B_group(&group[c][0], rds_flags->PI_code, rds_flags->TP, rds_flags->PTY, rds_flags->TA, rds_flags->MS, rds_flags->DI, c, &psname[c * 2]);
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// Generate checkbits for all blocks
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// Generate checkbits for each block of each group
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for (c = 0; c < 4; c++) {
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group[c][0] = makeblock(group[c][0], RDS_OFFSET_A);
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group[c][1] = makeblock(group[c][1], RDS_OFFSET_B);
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@ -90,36 +110,38 @@ uint16_t gen_PSN(const char * psname, const uint8_t pty) {
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uint32_t * tx_data_u32 = (uint32_t*)shared_memory.tx_data;
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// Copy to tx_data for baseband
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for (c = 0; c < 4 * 4; c++)
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tx_data_u32[c] = group[c >> 2][c & 3];
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return 4 * 4 * 26;
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}
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uint16_t gen_RadioText(const char * radiotext, const uint8_t pty) {
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uint16_t gen_RadioText(const char * text, const bool AB, const RDS_flags * rds_flags) {
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size_t c, i;
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uint32_t * group;
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char radiotext_buffer[65] = { 0 };
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uint8_t rtlen, groups;
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strcpy(radiotext_buffer, radiotext);
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strncpy(radiotext_buffer, text, 64);
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rtlen = strlen(radiotext_buffer);
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radiotext_buffer[rtlen] = 0x0D;
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// Pad to multiple of 4
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// Pad message with spaces to a multiple of 4 characters
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while (rtlen & 3)
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radiotext_buffer[rtlen++] = ' ';
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// End message with Carriage Return, as required
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if (rtlen < 64) radiotext_buffer[rtlen] = 0x0D;
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groups = rtlen >> 2; // 4 characters per group
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group = (uint32_t*)chHeapAlloc(0x0, 4 * groups * sizeof(uint32_t));
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group = (uint32_t*)chHeapAlloc(0, 4 * groups * sizeof(uint32_t));
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for (c = 0; c < groups; c++)
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make_2A_group(&group[c << 2], 0xF849, true, pty, false, c, &radiotext_buffer[c * 4]);
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make_2A_group(&group[c * 4], rds_flags->PI_code, rds_flags->TP, rds_flags->PTY, AB, c, &radiotext_buffer[c * 4]);
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// Generate checkbits
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// Generate checkbits for each block of each group
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for (c = 0; c < groups; c++) {
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i = c * 4;
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group[i + 0] = makeblock(group[i + 0], RDS_OFFSET_A);
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@ -130,10 +152,36 @@ uint16_t gen_RadioText(const char * radiotext, const uint8_t pty) {
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uint32_t * tx_data_u32 = (uint32_t*)shared_memory.tx_data;
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// Copy to tx_data for baseband
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for (c = 0; c < (groups * 4); c++)
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tx_data_u32[c] = group[c];
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chHeapFree(group);
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return groups * 4 * 26;
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}
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uint16_t gen_ClockTime(const RDS_flags * rds_flags,
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const uint16_t year, const uint8_t month, const uint8_t day,
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const uint8_t hour, const uint8_t minute, const int8_t local_offset) {
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uint8_t c;
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uint32_t group[4] = { 0 };
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make_4A_group(&group[0], rds_flags->PI_code, rds_flags->TP, rds_flags->PTY, year, month, day, hour, minute, local_offset);
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// Generate checkbits for each block
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group[0] = makeblock(group[0], RDS_OFFSET_A);
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group[1] = makeblock(group[1], RDS_OFFSET_B);
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group[2] = makeblock(group[2], RDS_OFFSET_C);
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group[3] = makeblock(group[3], RDS_OFFSET_D);
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uint32_t * tx_data_u32 = (uint32_t*)shared_memory.tx_data;
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// Copy to tx_data for baseband
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for (c = 0; c < 4; c++)
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tx_data_u32[c] = group[c];
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return 4 * 26;
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}
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} /* namespace rds */
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