![](/media/cache/profiles/f720ec3e5486f090fd382b68e230b435.50x50_q85.jpg)
The London Hackspace bandwidth meter
Dependencies: LPD8806 MODSERIAL mbed picojson
See:
- https://github.com/londonhackspace/net-o-meter
- http://wiki.london.hackspace.org.uk/view/Projects/BandwidthMeter
Diff: vfd.cpp
- Revision:
- 4:7087ea3d13c1
- Parent:
- 3:7fca72f96711
- Child:
- 5:24172484b8c5
--- a/vfd.cpp Thu Aug 23 00:17:04 2012 +0000 +++ b/vfd.cpp Mon Aug 27 01:32:52 2012 +0000 @@ -14,6 +14,8 @@ #include "mbed.h" #include "vfd.h" +#include "Stream.h" +#include "FunctionPointer.h" // InturruptIn busy_intr(p27) @@ -27,6 +29,8 @@ bool c_a0; bool c_blank; +bool vfd_dead = 0; + void vfd_shift_clock(void) { vfd_p_clock = 0; wait_us(100); @@ -34,7 +38,7 @@ wait_us(100); } -void vfd_doit(int data, int mode, int wr, int ss) { +void vfd_doit(int data, int mode, int wr, int ss, int reset) { int i, bit; vfd_p_data = 0; // nc @@ -42,7 +46,7 @@ vfd_p_data = 0; // nc vfd_shift_clock(); - vfd_p_data = 1; // reset, 0 = in reset + vfd_p_data = reset; // reset, 0 = in reset vfd_shift_clock(); vfd_p_data = c_blank; // Blank, 0 = blanked @@ -73,14 +77,25 @@ } /* mode == 1 if command */ -void vfd_send(int data, int mode) +void vfd_send(int data, int mode, int force) { data = data & 0xff; c_data = data; c_blank = 1; - if (vfd_p_busy) + if (mode == 0) + printf("%02x ", data); + + if (vfd_dead && ! force) { + printf("vfd dead (?), not sending.\r\n"); + return; + } + if (force) + printf("forcing vfd for 0x%02x %d\r\n", data, mode); + + if (vfd_p_busy) { printf("pre, busy: %d\r\n", vfd_p_busy.read()); + } if (vfd_p_busy) { @@ -88,23 +103,32 @@ if (vfd_p_busy) { printf("still busy :(\r\n"); - return; + printf("resetting\r\n"); + if (!force) + vfd_reset(); + if (vfd_p_busy) { + printf("still busy after reset!\r\n"); + if (!force) + return; + } + if (!force) + return; } } /* wr,ss */ - vfd_doit(data, mode, 0, 0); + vfd_doit(data, mode, 0, 0, 1); wait_us(1); - vfd_doit(data, mode, 1, 0); + vfd_doit(data, mode, 1, 0, 1); wait_us(1); - vfd_doit(data, mode, 1, 1); + vfd_doit(data, mode, 1, 1, 1); wait_us(1); if (vfd_p_busy) printf("post1, busy: %d\r\n", vfd_p_busy.read()); - vfd_doit(data, mode, 0, 0); - wait_ms(1); // loop and wait for not busy + vfd_doit(data, mode, 0, 0, 1); + wait_ms(4); // loop and wait for not busy if (vfd_p_busy) printf("post2, busy: %d\r\n", vfd_p_busy.read()); @@ -115,15 +139,20 @@ } } -void vfd_command(int data) { - vfd_send(data, 1); +void vfd_command(int data, int force) { + vfd_send(data, 1, force); } void vfd_data(int data) { - vfd_send(data, 0); + if ((data & 0xff) == 0x7f) { + data = 0x20; + printf("changed data to %02x\r\n", data); + } + vfd_send(data, 0, 0); } void vfd_init(void) { + vfd_data(0x11); // normal mode vfd_data(0x0c); // clear vfd_data(0x1b); // esc vfd_data(0); // v pos @@ -138,4 +167,69 @@ /* unblank */ } +void vfd_pos(int h, int v) { + if (v > 3 || v < 0) + return; + if (h > 19 || h < 0) + return; + vfd_data(0x1b); + vfd_data(v); + vfd_data(h); +} +void vfd_reset(void) { + int i, data, mode; + + data = 0; mode = 1; + + printf("reset sent, busy: %d\r\n", vfd_p_busy.read()); + + /* everything low, includeing reset */ + for (i = 0 ; i < 16; i++) { + vfd_p_data = 0; + vfd_shift_clock(); + } + vfd_p_latch = 0; + wait_us(10); + vfd_p_latch = 1; + + vfd_doit(data, mode, 0, 0, 1); + wait_us(1); + vfd_doit(data, mode, 1, 0, 1); + wait_us(1); + vfd_doit(data, mode, 1, 1, 1); + wait_us(1); + + if (vfd_p_busy) + printf("post1, busy: %d\r\n", vfd_p_busy.read()); + + vfd_doit(data, mode, 0, 0, 1); + wait_ms(1); // loop and wait for not busy + + printf("reset sent, busy: %d\r\n", vfd_p_busy.read()); + wait_ms(10); + if (vfd_p_busy) { + printf("still busy, not calling vfd_init()\r\n"); + vfd_reset_cmd(); + printf("post reset_cmd\r\n"); + vfd_dead = 1; + wait_ms(10); + } else { + if (!vfd_dead) + vfd_init(); + } +} + +void vfd_reset_cmd(void) { + vfd_command(0xff, 1); +} + +/* +class Vfd : Public Stream { + public: + + +} +*/ + +