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cpu/kinetis_common: Add debugging messages to i2c driver

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This commit is contained in:
Joakim Nohlgård 2016-07-30 07:59:07 +02:00
parent 5c8236217e
commit 8947a3c49c
1 changed files with 17 additions and 0 deletions
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17
cpu/kinetis_common/periph/i2c.c
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@ -33,8 +33,15 @@
#include "periph/i2c.h" #include "periph/i2c.h"
#define ENABLE_DEBUG (0) #define ENABLE_DEBUG (0)
/* Define ENABLE_TRACE to 1 to enable printing of all TX/RX bytes to UART for extra verbose debugging */
#define ENABLE_TRACE (0)
#include "debug.h" #include "debug.h"
#if ENABLE_TRACE
#define TRACE(...) DEBUG(__VA_ARGS__)
#else
#define TRACE(...)
#endif
/* guard file in case no I2C device is defined */ /* guard file in case no I2C device is defined */
#if I2C_NUMOF #if I2C_NUMOF
@ -76,6 +83,7 @@ int i2c_release(i2c_t dev)
int i2c_init_master(i2c_t dev, i2c_speed_t speed) int i2c_init_master(i2c_t dev, i2c_speed_t speed)
{ {
DEBUG("i2c_init_master: %lu, %lu\n", (unsigned long)dev, (unsigned long) speed);
I2C_Type *i2c; I2C_Type *i2c;
PORT_Type *i2c_port; PORT_Type *i2c_port;
int pin_scl = 0; int pin_scl = 0;
@ -175,6 +183,7 @@ static inline int _i2c_start(I2C_Type *dev, uint8_t address, uint8_t rw_flag)
{ {
/* bus free ? */ /* bus free ? */
if (dev->S & I2C_S_BUSY_MASK) { if (dev->S & I2C_S_BUSY_MASK) {
DEBUG("i2c:_start: bus busy\n");
return -1; return -1;
} }
@ -186,6 +195,7 @@ static inline int _i2c_start(I2C_Type *dev, uint8_t address, uint8_t rw_flag)
/* wait for bus-busy to be set */ /* wait for bus-busy to be set */
while (!(dev->S & I2C_S_BUSY_MASK)) { while (!(dev->S & I2C_S_BUSY_MASK)) {
if (_i2c_arbitration_lost(dev)) { if (_i2c_arbitration_lost(dev)) {
DEBUG("i2c:_start: arbitration lost\n");
return -1; return -1;
} }
} }
@ -196,11 +206,13 @@ static inline int _i2c_start(I2C_Type *dev, uint8_t address, uint8_t rw_flag)
dev->S = I2C_S_IICIF_MASK; dev->S = I2C_S_IICIF_MASK;
if (_i2c_arbitration_lost(dev)) { if (_i2c_arbitration_lost(dev)) {
DEBUG("i2c:_start: arbitration lost late\n");
return -1; return -1;
} }
/* check for receive acknowledge */ /* check for receive acknowledge */
if (dev->S & I2C_S_RXAK_MASK) { if (dev->S & I2C_S_RXAK_MASK) {
DEBUG("i2c:_start: no addr ack\n");
return -1; return -1;
} }
@ -219,11 +231,13 @@ static inline int _i2c_restart(I2C_Type *dev, uint8_t address, uint8_t rw_flag)
dev->S = I2C_S_IICIF_MASK; dev->S = I2C_S_IICIF_MASK;
if (_i2c_arbitration_lost(dev)) { if (_i2c_arbitration_lost(dev)) {
DEBUG("i2c:_restart: arbitration lost\n");
return -1; return -1;
} }
/* check for receive acknowledge */ /* check for receive acknowledge */
if (dev->S & I2C_S_RXAK_MASK) { if (dev->S & I2C_S_RXAK_MASK) {
DEBUG("i2c:_restart: no addr ack\n");
return -1; return -1;
} }
@ -251,6 +265,7 @@ static inline int _i2c_receive(I2C_Type *dev, uint8_t *data, int length)
dev->S = I2C_S_IICIF_MASK; dev->S = I2C_S_IICIF_MASK;
if (_i2c_arbitration_lost(dev)) { if (_i2c_arbitration_lost(dev)) {
DEBUG("i2c:_receive: arbitration lost (to go=%d)\n", length);
return -1; return -1;
} }
@ -268,6 +283,7 @@ static inline int _i2c_receive(I2C_Type *dev, uint8_t *data, int length)
} }
data[n] = (char)dev->D; data[n] = (char)dev->D;
TRACE("i2c: rx: %02x\n", (unsigned int)data[n]);
n++; n++;
} }
@ -279,6 +295,7 @@ static inline int _i2c_transmit(I2C_Type *dev, uint8_t *data, int length)
int n = 0; int n = 0;
while (length > 0) { while (length > 0) {
TRACE("i2c: tx: %02x\n", (unsigned int)data[n]);
dev->D = data[n]; dev->D = data[n];
while (!(dev->S & I2C_S_IICIF_MASK)); while (!(dev->S & I2C_S_IICIF_MASK));