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runtime/i2c: make syscalls more ARTIQ-Python-friendly

This commit is contained in:
Sebastien Bourdeauducq 2016-03-05 00:16:12 +08:00
parent 3364827744
commit ff4a46c278
3 changed files with 13 additions and 10 deletions
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4
artiq/coredevice/exceptions.py
View File

@ -113,3 +113,7 @@ class DDSBatchError(Exception):
or when too many commands are batched. or when too many commands are batched.
""" """
artiq_builtin = True artiq_builtin = True
class I2CError(Exception):
"""Raised with a I2C transaction fails."""
artiq_builtin = True

13
artiq/runtime/i2c.c
View File

@ -1,5 +1,6 @@
#include <generated/csr.h> #include <generated/csr.h>
#include "artiq_personality.h"
#include "rtio.h" #include "rtio.h"
#include "i2c.h" #include "i2c.h"
@ -91,7 +92,7 @@ static void i2c_scl_o(int busno, int o) {}
#endif #endif
int i2c_init(int busno) void i2c_init(int busno)
{ {
/* Set SCL as output, and high level */ /* Set SCL as output, and high level */
i2c_scl_o(busno, 1); i2c_scl_o(busno, 1);
@ -104,10 +105,8 @@ int i2c_init(int busno)
/* Check the I2C bus is ready */ /* Check the I2C bus is ready */
i2c_halfperiod(); i2c_halfperiod();
i2c_halfperiod(); i2c_halfperiod();
if(i2c_sda_i(busno)) if(!i2c_sda_i(busno))
return 1; /* success */ artiq_raise_from_c("I2CError", "SDA is stuck low")
else
return 0;
} }
void i2c_start(int busno) void i2c_start(int busno)
@ -132,7 +131,7 @@ void i2c_stop(int busno)
i2c_halfperiod(); i2c_halfperiod();
} }
int i2c_write(int busno, char b) int i2c_write(int busno, int b)
{ {
int i; int i;
@ -158,7 +157,7 @@ int i2c_write(int busno, char b)
return !i2c_sda_i(busno); return !i2c_sda_i(busno);
} }
char i2c_read(int busno, int ack) int i2c_read(int busno, int ack)
{ {
int i; int i;
char b; char b;

6
artiq/runtime/i2c.h
View File

@ -1,10 +1,10 @@
#ifndef __I2C_H #ifndef __I2C_H
#define __I2C_H #define __I2C_H
int i2c_init(int busno); void i2c_init(int busno);
void i2c_start(int busno); void i2c_start(int busno);
void i2c_stop(int busno); void i2c_stop(int busno);
int i2c_write(int busno, char b); int i2c_write(int busno, int b);
char i2c_read(int busno, int ack); int i2c_read(int busno, int ack);
#endif #endif