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demo block-based serial transfer
Revision 0:0d85b515c87d, committed 2018-01-29
- Comitter:
- bwang
- Date:
- Mon Jan 29 10:49:38 2018 +0000
- Commit message:
- demo;
Changed in this revision
main.cpp | Show annotated file Show diff for this revision Revisions of this file |
mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Mon Jan 29 10:49:38 2018 +0000 @@ -0,0 +1,68 @@ +#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; + } + } +}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Mon Jan 29 10:49:38 2018 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/e7ca05fa8600 \ No newline at end of file