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demo block-based serial transfer
main.cpp
- Committer:
- bwang
- Date:
- 2018-01-29
- Revision:
- 0:0d85b515c87d
File content as of revision 0:0d85b515c87d:
#include "mbed.h" #define PAGE_SIZE 4096 #define HEADER_SIZE 10 #define PACKET_SIZE 8 #define BAUD_RATE 921600 #define F_SW 5000.0f #define clip(a) if ((a > 254)) a = 254 Serial serial4(A0, A1); Ticker tick; DigitalOut test(PC_8); DigitalOut test2(PC_6); DigitalOut led(LED1); int index = 0; char *front, *back, *tmp; char buf1[PAGE_SIZE], buf2[PAGE_SIZE]; unsigned char a = 0, b = 32, c = 64, d = 96, e = 128, f = 160, g = 192, h = 224; void tic() { test = 1; volatile int x; for (x = 0; x < 1000; x++) { } front[index] = 0xff; front[index+1] = a++; front[index+2] = b++; front[index+3] = c++; front[index+4] = d++; front[index+5] = e++; front[index+6] = f++; front[index+7] = g++; front[index+8] = h++; if (a == 0xff) a = 0; if (b == 0xff) b = 0; if (c == 0xff) c = 0; if (d == 0xff) d = 0; if (e == 0xff) e = 0; if (f == 0xff) f = 0; if (g == 0xff) g = 0; if (h == 0xff) h = 0; index += PACKET_SIZE+1; test = 0; } int main() { front = buf1; back = buf2; serial4.baud(BAUD_RATE); tick.attach(tic, 1/F_SW); for (;;) { if (index == PAGE_SIZE-HEADER_SIZE) { test2 = 1; led = 1; index = 0; tmp = front; front = back; back = tmp; for (int i = 0; i < PAGE_SIZE-HEADER_SIZE; i++) serial4.putc(back[i]); led = 0; test2 = 0; } } }