Boyu Fang
/
biuart_test
test program for biuart
main.cpp@0:40d82aa11fe0, 2014-08-11 (annotated)
- Committer:
- bf1891
- Date:
- Mon Aug 11 10:38:04 2014 +0000
- Revision:
- 0:40d82aa11fe0
- Child:
- 1:36aff54b80e2
Initialise;
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
bf1891 | 0:40d82aa11fe0 | 1 | #include "mbed.h" |
bf1891 | 0:40d82aa11fe0 | 2 | #include <vector> |
bf1891 | 0:40d82aa11fe0 | 3 | |
bf1891 | 0:40d82aa11fe0 | 4 | Serial pc(USBTX, USBRX); |
bf1891 | 0:40d82aa11fe0 | 5 | Serial uart(p13, p14); |
bf1891 | 0:40d82aa11fe0 | 6 | DigitalInOut nREQ(p15); |
bf1891 | 0:40d82aa11fe0 | 7 | DigitalInOut nRDY(p16); |
bf1891 | 0:40d82aa11fe0 | 8 | |
bf1891 | 0:40d82aa11fe0 | 9 | uint16_t ccitt(uint8_t len, uint8_t* buf); |
bf1891 | 0:40d82aa11fe0 | 10 | |
bf1891 | 0:40d82aa11fe0 | 11 | uint16_t ccitt(uint8_t len, uint8_t* buf) { |
bf1891 | 0:40d82aa11fe0 | 12 | // length is masked to 8 bits (256=0) for checksum calculation, as it is in |
bf1891 | 0:40d82aa11fe0 | 13 | // the packet |
bf1891 | 0:40d82aa11fe0 | 14 | uint16_t crc = 0xffff ^ (len & 0xff); |
bf1891 | 0:40d82aa11fe0 | 15 | |
bf1891 | 0:40d82aa11fe0 | 16 | for (int i = 0; i < len; i++) { |
bf1891 | 0:40d82aa11fe0 | 17 | crc = (crc >> 8) | (crc << 8); |
bf1891 | 0:40d82aa11fe0 | 18 | crc ^= buf[i]; |
bf1891 | 0:40d82aa11fe0 | 19 | crc ^= (crc & 0xFF) >> 4; |
bf1891 | 0:40d82aa11fe0 | 20 | crc ^= crc << 12; |
bf1891 | 0:40d82aa11fe0 | 21 | crc ^= (crc & 0xFF) << 5; |
bf1891 | 0:40d82aa11fe0 | 22 | } |
bf1891 | 0:40d82aa11fe0 | 23 | |
bf1891 | 0:40d82aa11fe0 | 24 | return crc; |
bf1891 | 0:40d82aa11fe0 | 25 | } |
bf1891 | 0:40d82aa11fe0 | 26 | |
bf1891 | 0:40d82aa11fe0 | 27 | int main() { |
bf1891 | 0:40d82aa11fe0 | 28 | pc.baud(38400); |
bf1891 | 0:40d82aa11fe0 | 29 | uart.baud(38400); |
bf1891 | 0:40d82aa11fe0 | 30 | |
bf1891 | 0:40d82aa11fe0 | 31 | pc.printf("\n\r--------\n\rUART Test\n\r"); |
bf1891 | 0:40d82aa11fe0 | 32 | |
bf1891 | 0:40d82aa11fe0 | 33 | if (uart.readable()) { |
bf1891 | 0:40d82aa11fe0 | 34 | pc.printf("Leftover characters: "); |
bf1891 | 0:40d82aa11fe0 | 35 | while(uart.readable()) { |
bf1891 | 0:40d82aa11fe0 | 36 | pc.printf("%c", uart.getc()); |
bf1891 | 0:40d82aa11fe0 | 37 | } |
bf1891 | 0:40d82aa11fe0 | 38 | pc.printf("\n\r"); |
bf1891 | 0:40d82aa11fe0 | 39 | } |
bf1891 | 0:40d82aa11fe0 | 40 | |
bf1891 | 0:40d82aa11fe0 | 41 | nREQ.input(); |
bf1891 | 0:40d82aa11fe0 | 42 | nREQ.mode(PullUp); |
bf1891 | 0:40d82aa11fe0 | 43 | nRDY.input(); |
bf1891 | 0:40d82aa11fe0 | 44 | nRDY.mode(PullUp); |
bf1891 | 0:40d82aa11fe0 | 45 | |
bf1891 | 0:40d82aa11fe0 | 46 | pc.printf("Waiting\n\r"); |
bf1891 | 0:40d82aa11fe0 | 47 | |
bf1891 | 0:40d82aa11fe0 | 48 | while(nREQ != 0) { |
bf1891 | 0:40d82aa11fe0 | 49 | wait(0.1); |
bf1891 | 0:40d82aa11fe0 | 50 | pc.printf("nREQ: %d\n\r", nREQ.read()); |
bf1891 | 0:40d82aa11fe0 | 51 | } |
bf1891 | 0:40d82aa11fe0 | 52 | |
bf1891 | 0:40d82aa11fe0 | 53 | // pc.printf("nREQ has gone low\n\r"); |
bf1891 | 0:40d82aa11fe0 | 54 | |
bf1891 | 0:40d82aa11fe0 | 55 | nRDY = 0; |
bf1891 | 0:40d82aa11fe0 | 56 | nRDY.output(); |
bf1891 | 0:40d82aa11fe0 | 57 | |
bf1891 | 0:40d82aa11fe0 | 58 | int len = uart.getc(); |
bf1891 | 0:40d82aa11fe0 | 59 | pc.printf("len: %d\n\r", len); |
bf1891 | 0:40d82aa11fe0 | 60 | std::vector<uint8_t> payload; |
bf1891 | 0:40d82aa11fe0 | 61 | for (int i = 0; i < len; i++) { |
bf1891 | 0:40d82aa11fe0 | 62 | payload.push_back(uart.getc()); |
bf1891 | 0:40d82aa11fe0 | 63 | pc.printf("%d have recieved\n\r", payload.size()); |
bf1891 | 0:40d82aa11fe0 | 64 | } |
bf1891 | 0:40d82aa11fe0 | 65 | |
bf1891 | 0:40d82aa11fe0 | 66 | uint8_t checksum = 0; |
bf1891 | 0:40d82aa11fe0 | 67 | for (int i = 0; i < 2; i++) { |
bf1891 | 0:40d82aa11fe0 | 68 | checksum |= ((uint16_t) (uart.getc())) << (i * 8); |
bf1891 | 0:40d82aa11fe0 | 69 | } |
bf1891 | 0:40d82aa11fe0 | 70 | |
bf1891 | 0:40d82aa11fe0 | 71 | pc.printf("len: %d\n\r", len); |
bf1891 | 0:40d82aa11fe0 | 72 | pc.printf("payload: "); |
bf1891 | 0:40d82aa11fe0 | 73 | for (int i = 0; i < len; i++) { |
bf1891 | 0:40d82aa11fe0 | 74 | pc.printf("%c", payload[i]); |
bf1891 | 0:40d82aa11fe0 | 75 | } |
bf1891 | 0:40d82aa11fe0 | 76 | pc.printf("\n\r"); |
bf1891 | 0:40d82aa11fe0 | 77 | pc.printf("checksum: 0x%X\n\r", checksum); |
bf1891 | 0:40d82aa11fe0 | 78 | |
bf1891 | 0:40d82aa11fe0 | 79 | uint16_t crc = ccitt(len, &payload[0]); |
bf1891 | 0:40d82aa11fe0 | 80 | pc.printf("ccitt: 0x%X\n\r", crc); |
bf1891 | 0:40d82aa11fe0 | 81 | |
bf1891 | 0:40d82aa11fe0 | 82 | nRDY.input(); |
bf1891 | 0:40d82aa11fe0 | 83 | nRDY.mode(PullUp); |
bf1891 | 0:40d82aa11fe0 | 84 | |
bf1891 | 0:40d82aa11fe0 | 85 | pc.printf("Sending\n\r"); |
bf1891 | 0:40d82aa11fe0 | 86 | |
bf1891 | 0:40d82aa11fe0 | 87 | uint8_t* str = (uint8_t*) "HelloHelloHelloHelloHello"; |
bf1891 | 0:40d82aa11fe0 | 88 | uint8_t str_len = 5; |
bf1891 | 0:40d82aa11fe0 | 89 | // uint16_t str_checksum = ccitt(str_len, str); |
bf1891 | 0:40d82aa11fe0 | 90 | |
bf1891 | 0:40d82aa11fe0 | 91 | nREQ = 0; |
bf1891 | 0:40d82aa11fe0 | 92 | nREQ.output(); |
bf1891 | 0:40d82aa11fe0 | 93 | |
bf1891 | 0:40d82aa11fe0 | 94 | while(nRDY != 0) { |
bf1891 | 0:40d82aa11fe0 | 95 | wait(0.1); |
bf1891 | 0:40d82aa11fe0 | 96 | } |
bf1891 | 0:40d82aa11fe0 | 97 | |
bf1891 | 0:40d82aa11fe0 | 98 | pc.printf("got nRDY\n\r"); |
bf1891 | 0:40d82aa11fe0 | 99 | |
bf1891 | 0:40d82aa11fe0 | 100 | uart.putc(str_len); |
bf1891 | 0:40d82aa11fe0 | 101 | for (int i = 0; i < (str_len + 1); i++) { |
bf1891 | 0:40d82aa11fe0 | 102 | uart.putc(str[i]); |
bf1891 | 0:40d82aa11fe0 | 103 | } |
bf1891 | 0:40d82aa11fe0 | 104 | uart.putc(0); |
bf1891 | 0:40d82aa11fe0 | 105 | uart.putc(0); |
bf1891 | 0:40d82aa11fe0 | 106 | |
bf1891 | 0:40d82aa11fe0 | 107 | nREQ.input(); |
bf1891 | 0:40d82aa11fe0 | 108 | nREQ.mode(PullUp); |
bf1891 | 0:40d82aa11fe0 | 109 | |
bf1891 | 0:40d82aa11fe0 | 110 | pc.printf("All done\n\r"); |
bf1891 | 0:40d82aa11fe0 | 111 | |
bf1891 | 0:40d82aa11fe0 | 112 | while (1) { |
bf1891 | 0:40d82aa11fe0 | 113 | // if (uart.readable()) { |
bf1891 | 0:40d82aa11fe0 | 114 | // pc.printf("%c", uart.getc()); |
bf1891 | 0:40d82aa11fe0 | 115 | // } |
bf1891 | 0:40d82aa11fe0 | 116 | } |
bf1891 | 0:40d82aa11fe0 | 117 | } |