diff options
Diffstat (limited to 'commandline')
| -rw-r--r-- | commandline/i2c.c | 60 |
1 files changed, 28 insertions, 32 deletions
diff --git a/commandline/i2c.c b/commandline/i2c.c index 6829ac3..db88bac 100644 --- a/commandline/i2c.c +++ b/commandline/i2c.c @@ -197,32 +197,28 @@ static void verify_scl_high() /* - * for the record: Yes, this is ugly. - * * Firmware: DDRB = ~b (with hardware pull-ups and PORTB = 0) * So to pull an output high (1), we turn it on, which sets it as input * -> pull-up works. for low (0): turn it off -> output -> pulled low */ -#define SDA_1 usb_control_msg(handle, USB_TYPE_VENDOR \ - | USB_RECIP_DEVICE | USB_ENDPOINT_IN, \ - PSCMD_ON, 0, BIT_SDA, (char *)buffer, sizeof(buffer), \ - 5000); +void set_sda(char value) { + // discarded + unsigned char buffer[8]; -#define SDA_0 usb_control_msg(handle, USB_TYPE_VENDOR \ - | USB_RECIP_DEVICE | USB_ENDPOINT_IN, \ - PSCMD_OFF, 0, BIT_SDA, (char *)buffer, sizeof(buffer), \ - 5000); + usb_control_msg(handle, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN, + (value ? PSCMD_ON : PSCMD_OFF), 0, BIT_SDA, + (char *)buffer, sizeof(buffer), 5000); +} -#define SCL_1 usb_control_msg(handle, USB_TYPE_VENDOR \ - | USB_RECIP_DEVICE | USB_ENDPOINT_IN, \ - PSCMD_ON, 0, BIT_SCL, (char *)buffer, sizeof(buffer), \ - 5000); +void set_scl(char value) { + // discarded + unsigned char buffer[8]; -#define SCL_0 usb_control_msg(handle, USB_TYPE_VENDOR \ - | USB_RECIP_DEVICE | USB_ENDPOINT_IN, \ - PSCMD_OFF, 0, BIT_SCL, (char *)buffer, sizeof(buffer), \ - 5000); + usb_control_msg(handle, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN, + (value ? PSCMD_ON : PSCMD_OFF), 0, BIT_SCL, + (char *)buffer, sizeof(buffer), 5000); +} int main(int argc, char **argv) { @@ -242,12 +238,12 @@ unsigned char buffer[8]; signed char i; short int number; - SDA_1; - SCL_1; + set_sda(1); + set_scl(1); usleep(1000); - SDA_0; + set_sda(0); usleep(1000); - SCL_0; + set_scl(0); verify_sda_low(); verify_scl_low(); puts("ready"); @@ -258,16 +254,16 @@ unsigned char buffer[8]; for (i = 7; i >= -1; i--) { if ((i < 0) || (number == 256) || (number & (1 << i))) { puts("sda ↑"); - SDA_1; + set_sda(1); //verify_sda_high(); } else { puts("sda ↓"); - SDA_0; + set_sda(0); //verify_sda_low(); } usleep(10); puts("scl ↑"); - SCL_1; + set_scl(1); usleep(10); //verify_scl_high(); if (i < 0) { @@ -283,27 +279,27 @@ unsigned char buffer[8]; puts("0"); } puts("scl ↓"); - SCL_0; + set_scl(0); usleep(10); //verify_scl_low(); } } } if (strcmp(line, "push\n") == 0) { - SCL_1; + set_scl(1); usleep(30000); - SDA_1; + set_sda(1); usleep(100000); - SDA_0; + set_sda(0); usleep(100000); - SCL_0; + set_scl(0); } } - SCL_1; + set_scl(1); usleep(10); verify_scl_high(); - SDA_1; + set_sda(1); usleep(10); verify_sda_high(); |