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sending and receiving data from a Dynamixel
Revision 0:bcd01ae054eb, committed 2019-05-04
- Comitter:
- bwang
- Date:
- Sat May 04 18:46:43 2019 +0000
- Commit message:
- first commit
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/crc.cpp Sat May 04 18:46:43 2019 +0000 @@ -0,0 +1,46 @@ +unsigned short update_crc(unsigned short crc_accum, unsigned char *data_blk_ptr, unsigned short data_blk_size) +{ + unsigned short i, j; + unsigned short crc_table[256] = { + 0x0000, 0x8005, 0x800F, 0x000A, 0x801B, 0x001E, 0x0014, 0x8011, + 0x8033, 0x0036, 0x003C, 0x8039, 0x0028, 0x802D, 0x8027, 0x0022, + 0x8063, 0x0066, 0x006C, 0x8069, 0x0078, 0x807D, 0x8077, 0x0072, + 0x0050, 0x8055, 0x805F, 0x005A, 0x804B, 0x004E, 0x0044, 0x8041, + 0x80C3, 0x00C6, 0x00CC, 0x80C9, 0x00D8, 0x80DD, 0x80D7, 0x00D2, + 0x00F0, 0x80F5, 0x80FF, 0x00FA, 0x80EB, 0x00EE, 0x00E4, 0x80E1, + 0x00A0, 0x80A5, 0x80AF, 0x00AA, 0x80BB, 0x00BE, 0x00B4, 0x80B1, + 0x8093, 0x0096, 0x009C, 0x8099, 0x0088, 0x808D, 0x8087, 0x0082, + 0x8183, 0x0186, 0x018C, 0x8189, 0x0198, 0x819D, 0x8197, 0x0192, + 0x01B0, 0x81B5, 0x81BF, 0x01BA, 0x81AB, 0x01AE, 0x01A4, 0x81A1, + 0x01E0, 0x81E5, 0x81EF, 0x01EA, 0x81FB, 0x01FE, 0x01F4, 0x81F1, + 0x81D3, 0x01D6, 0x01DC, 0x81D9, 0x01C8, 0x81CD, 0x81C7, 0x01C2, + 0x0140, 0x8145, 0x814F, 0x014A, 0x815B, 0x015E, 0x0154, 0x8151, + 0x8173, 0x0176, 0x017C, 0x8179, 0x0168, 0x816D, 0x8167, 0x0162, + 0x8123, 0x0126, 0x012C, 0x8129, 0x0138, 0x813D, 0x8137, 0x0132, + 0x0110, 0x8115, 0x811F, 0x011A, 0x810B, 0x010E, 0x0104, 0x8101, + 0x8303, 0x0306, 0x030C, 0x8309, 0x0318, 0x831D, 0x8317, 0x0312, + 0x0330, 0x8335, 0x833F, 0x033A, 0x832B, 0x032E, 0x0324, 0x8321, + 0x0360, 0x8365, 0x836F, 0x036A, 0x837B, 0x037E, 0x0374, 0x8371, + 0x8353, 0x0356, 0x035C, 0x8359, 0x0348, 0x834D, 0x8347, 0x0342, + 0x03C0, 0x83C5, 0x83CF, 0x03CA, 0x83DB, 0x03DE, 0x03D4, 0x83D1, + 0x83F3, 0x03F6, 0x03FC, 0x83F9, 0x03E8, 0x83ED, 0x83E7, 0x03E2, + 0x83A3, 0x03A6, 0x03AC, 0x83A9, 0x03B8, 0x83BD, 0x83B7, 0x03B2, + 0x0390, 0x8395, 0x839F, 0x039A, 0x838B, 0x038E, 0x0384, 0x8381, + 0x0280, 0x8285, 0x828F, 0x028A, 0x829B, 0x029E, 0x0294, 0x8291, + 0x82B3, 0x02B6, 0x02BC, 0x82B9, 0x02A8, 0x82AD, 0x82A7, 0x02A2, + 0x82E3, 0x02E6, 0x02EC, 0x82E9, 0x02F8, 0x82FD, 0x82F7, 0x02F2, + 0x02D0, 0x82D5, 0x82DF, 0x02DA, 0x82CB, 0x02CE, 0x02C4, 0x82C1, + 0x8243, 0x0246, 0x024C, 0x8249, 0x0258, 0x825D, 0x8257, 0x0252, + 0x0270, 0x8275, 0x827F, 0x027A, 0x826B, 0x026E, 0x0264, 0x8261, + 0x0220, 0x8225, 0x822F, 0x022A, 0x823B, 0x023E, 0x0234, 0x8231, + 0x8213, 0x0216, 0x021C, 0x8219, 0x0208, 0x820D, 0x8207, 0x0202 + }; + + for(j = 0; j < data_blk_size; j++) + { + i = ((unsigned short)(crc_accum >> 8) ^ data_blk_ptr[j]) & 0xFF; + crc_accum = (crc_accum << 8) ^ crc_table[i]; + } + + return crc_accum; +} \ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/crc.h Sat May 04 18:46:43 2019 +0000 @@ -0,0 +1,6 @@ +#ifndef __CRC_H +#define __CRC_H + +unsigned short update_crc(unsigned short crc_accum, unsigned char *data_blk_ptr, unsigned short data_blk_size); + +#endif \ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Sat May 04 18:46:43 2019 +0000 @@ -0,0 +1,77 @@ +#include "mbed.h" +#include "crc.h" + +Serial pc(SERIAL_TX, SERIAL_RX); + +Serial uart(PA_11, PA_12); +DigitalOut RTS(D12); + +DigitalOut dbg(D2); +DigitalOut flip(D3); + +volatile int rx_count = 0; +uint8_t rx_buffer[100]; + +void rxCallback() { + while (uart.readable()) { + rx_buffer[rx_count] = uart.getc(); + rx_count++; + } +} + +void write_get_position(uint8_t id) { + uint8_t tx_buffer[14]; + rx_count = 0; + + tx_buffer[0] = 0xff; + tx_buffer[1] = 0xff; + tx_buffer[2] = 0xfd; + tx_buffer[3] = 0x00; + tx_buffer[4] = id; //ID + tx_buffer[5] = 0x07; //length + tx_buffer[6] = 0x00; //length2 + tx_buffer[7] = 0x02; //read command + tx_buffer[8] = 0x84; //position identifier + tx_buffer[9] = 0x00; + tx_buffer[10] = 0x04; + tx_buffer[11] = 0x00; + uint16_t crc = update_crc(0, tx_buffer, 12); + tx_buffer[12] = crc & 0xff; + tx_buffer[13] = (crc >> 8) & 0xff; + + printf("0x%x 0x%x\n", tx_buffer[12], tx_buffer[13]); + + RTS = 1; + wait_us(100); + for (int i = 0; i < 14; i++) { + uart.putc(tx_buffer[i]); + } + wait_us(200); + RTS = 0; + + flip = 1; + while (rx_count < 15) { + } + flip = 0; + + for (int i = 0; i < 15; i++) { + pc.printf("0x%x ", rx_buffer[i]); + } + pc.printf("\n"); +} + +int main() +{ + pc.baud(115200); + uart.baud(115200); + uart.attach(rxCallback); + + pc.printf("Program is running!\n"); + + for (;;) { + dbg = 1; + write_get_position(0x01); + dbg = 0; + wait(1); + } +}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Sat May 04 18:46:43 2019 +0000 @@ -0,0 +1,1 @@ +https://os.mbed.com/users/mbed_official/code/mbed/builds/65be27845400 \ No newline at end of file