// *****************************************************************************
// example for reading device ID
// address is the 7 bit address
// *****************************************************************************
int main(int argc, char **argv)
{
uint8_t buf[64], j;
struct bcm2835_i2cbb ibb;
// address, sda,scl,clock_freq,timeout
if(bcm2835_i2cbb_open(&ibb,0x21,17,21,300,1000000)) exit(1);
// discover addresses on bus
bcm8235_i2cbb_discover(&ibb, 0x10, 0xe0);
// most devices have a command 0x55, this will return an incrementing
// count
// &ibb.address = 0x21; // change address if required
// bcm8235_i2cbb_putc(&ibb, 0x55);
// bcm8235_i2cbb_gets(&ibb, buf, 4);
// for(j=0;j<4;j++) {
// printf("read %x\n",buf[j]);
// }
// BV4208 & BV4218 I2C LCD display
// Clear screen and print Hello
// ibb.address = 0x21; // address
// buf[0]=1; // lcd command
// buf[1]=1; // clear screen
// bcm8235_i2cbb_puts(&ibb, buf, 2);
// sleep(1); // cls takes a while
// strcpy(buf,"\2Hello"); // 2 is command for writing data
// bcm8235_i2cbb_puts(&ibb, buf, strlen(buf));
// Relay BV4502
// ibb.address = 0x31; // address
// buf[0]=1; // relay A
// buf[1]=1; // on
// bcm8235_i2cbb_puts(&ibb, buf, 2);
// sleep(3);
// buf[1]=0; // off
// bcm8235_i2cbb_puts(&ibb, buf, 2);
// ADC BV4205
// ibb.address = 0x31; // address
// set auto scan
// buf[0]=6; // autoscan command
// buf[1]=1; // on
// bcm8235_i2cbb_puts(&ibb, buf, 2);
// buf[0] = 7; // autoscan read
// buf[1] = 0; // start at 0
// get all 20 readings
// bcm8235_i2cbb_puts(&ibb, buf, 2); // auto scan
// bcm8235_i2cbb_gets(&ibb, buf, 20);
// uint16_t v;
// for(j=0;j<20;j+=2) {
// v = (buf[j]*256) + buf[j]+1;
// printf("\n A%d %u ",j,v);
// }
exit(0);
}
int main(int argc, char **argv)
{
char msg[MAX_GPS_MSG_LEN+1];
struct bcm2835_i2cbb ibb;
uint32_t speed = 250;
uint32_t kbit = 100;
if (argc > 1) {
kbit = atoi(argv[1]);
switch (kbit) {
case 50: speed = 500; break; // 500 gives roughly 50Kbit/s
case 100: speed = 250; break; // 250 gives roughly 100Kbit/s
case 200: speed = 100; break; // 100 gives roughly 200Kbit/s
case 300: speed = 50; break; // 50 gives roughly 300Kbit/s
case 400: speed = 23; break; // 23 gives roughly 400Kbit/s
default:
printf("Bad speed '%s'=%u, should be 50,100,200,300 or 400\n", argv[1], kbit);
exit(1);
}
}
printf("Using speed ~ %u Kbit/s\n", kbit);
// address, sda,scl,clock_freq,timeout
if(bcm2835_i2cbb_open(&ibb,0x42,2,3,speed,1000000)) {
printf("Failed to initialize bitbanged I2C. Aborting...\n");
exit(1);
}
while(1) {
int len = gps_read_message(&ibb, msg);
if (len > 0) {
gps_process_message(msg, len);
}
gps_delay_ms(100);
}
exit(0);
}
void startI2Cgps(void) {
gpsi2c.address = GPS_ADDR;
bcm2835_i2cbb_open(&gpsi2c, GPS_ADDR, 2, 3, 300, 2000000);
}
