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Add capture mode support to API and i2ccl

This commit is contained in:
James Bowman 2020-03-06 06:29:35 -08:00
parent 619625e4f0
commit 2bdf4412da
2 changed files with 60 additions and 0 deletions
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59
c/common/i2cdriver.c
View File

@ -18,7 +18,9 @@
#if defined(WIN32) // {
#ifndef NOMINMAX
#define NOMINMAX
#endif
#include <windows.h>
void ErrorExit(const char *func_name)
@ -367,6 +369,56 @@ void i2c_monitor(I2CDriver *sd, int enable)
charCommand(sd, enable ? 'm' : '@');
}
void i2c_capture(I2CDriver *sd)
{
printf("Capture started\n");
charCommand(sd, 'c');
uint8_t bytes[1];
int starting = 0;
int nbits = 0, bits = 0;
while (1) {
int i;
readFromSerialPort(sd->port, bytes, 1);
for (i = 0; i < 2; i++) {
int symbol = (i == 0) ? (bytes[0] >> 4) : (bytes[0] & 0xf);
switch (symbol) {
case 0:
break;
case 1:
starting = 1;
break;
case 2:
printf("STOP\n");
starting = 1;
break;
case 8:
case 9:
case 10:
case 11:
case 12:
case 13:
case 14:
case 15:
bits = (bits << 3) | (symbol & 7);
nbits += 3;
if (nbits == 9) {
int b8 = (bits >> 1), ack = !(bits & 1);
if (starting) {
starting = 0;
printf("START %02x %s", b8 >> 1, (b8 & 1) ? "READ" : "WRITE");
} else {
printf("BYTE %02x", b8);
}
printf(" %s\n", ack ? "ACK" : "NAK");
nbits = 0;
bits = 0;
}
}
}
}
}
int i2c_commands(I2CDriver *sd, int argc, char *argv[])
{
int i;
@ -479,6 +531,12 @@ int i2c_commands(I2CDriver *sd, int argc, char *argv[])
}
break;
case 'c':
{
i2c_capture(sd);
}
break;
default:
badcommand:
fprintf(stderr, "Bad command '%s'\n", token);
@ -492,6 +550,7 @@ int i2c_commands(I2CDriver *sd, int argc, char *argv[])
fprintf(stderr, " p send a STOP\n");
fprintf(stderr, " r dev N read N bytes from I2C device dev, then STOP\n");
fprintf(stderr, " m enter I2C bus monitor mode\n");
fprintf(stderr, " c enter I2C bus capture mode\n");
fprintf(stderr, "\n");
return 1;

1
c/common/i2cdriver.h
View File

@ -36,6 +36,7 @@ int i2c_start(I2CDriver *sd, uint8_t dev, uint8_t op);
void i2c_stop(I2CDriver *sd);
void i2c_monitor(I2CDriver *sd, int enable);
void i2c_capture(I2CDriver *sd);
int i2c_commands(I2CDriver *sd, int argc, char *argv[]);