static uint8_t ao_hmc5883_configured;
+static uint8_t ao_hmc5883_addr;
+
static void
ao_hmc5883_reg_write(uint8_t addr, uint8_t data)
{
ao_i2c_start(AO_HMC5883_I2C_INDEX, HMC5883_ADDR_WRITE);
ao_i2c_send(d, 2, AO_HMC5883_I2C_INDEX, TRUE);
ao_i2c_put(AO_HMC5883_I2C_INDEX);
+ ao_hmc5883_addr = addr + 1;
}
static void
ao_hmc5883_read(uint8_t addr, uint8_t *data, uint8_t len)
{
ao_i2c_get(AO_HMC5883_I2C_INDEX);
- ao_i2c_start(AO_HMC5883_I2C_INDEX, HMC5883_ADDR_WRITE);
- ao_i2c_send(&addr, 1, AO_HMC5883_I2C_INDEX, FALSE);
+ if (addr != ao_hmc5883_addr) {
+ ao_i2c_start(AO_HMC5883_I2C_INDEX, HMC5883_ADDR_WRITE);
+ ao_i2c_send(&addr, 1, AO_HMC5883_I2C_INDEX, FALSE);
+ }
ao_i2c_start(AO_HMC5883_I2C_INDEX, HMC5883_ADDR_READ);
ao_i2c_recv(data, len, AO_HMC5883_I2C_INDEX, TRUE);
ao_i2c_put(AO_HMC5883_I2C_INDEX);
+ ao_hmc5883_addr = 0xff;
}
static uint8_t ao_hmc5883_done;
ao_hmc5883_isr(void)
{
ao_exti_disable(&AO_HMC5883_INT_PORT, AO_HMC5883_INT_PIN);
- ao_hmc5883_done = 1;
+ ++ao_hmc5883_done;
ao_wakeup(&ao_hmc5883_done);
}
ao_hmc5883_done = 0;
ao_exti_enable(&AO_HMC5883_INT_PORT, AO_HMC5883_INT_PIN);
ao_hmc5883_reg_write(HMC5883_MODE, HMC5883_MODE_SINGLE);
+
cli();
while (!ao_hmc5883_done)
ao_sleep(&ao_hmc5883_done);
sei();
+
+ printf ("done %d\n", ao_hmc5883_done);
+
ao_hmc5883_read(HMC5883_X_MSB, (uint8_t *) sample, sizeof (struct ao_hmc5883_sample));
#if __BYTE_ORDER == __LITTLE_ENDIAN
/* byte swap */
static uint8_t
ao_hmc5883_setup(void)
{
+ uint8_t d;
uint8_t present;
if (ao_hmc5883_configured)
return 1;
- /* Enable the EXTI interrupt for the appropriate pin */
- ao_enable_port(AO_HMC5883_INT_PORT);
- ao_exti_setup(&AO_HMC5883_INT_PORT, AO_HMC5883_INT_PIN,
- AO_EXTI_MODE_FALLING, ao_hmc5883_isr);
-
ao_i2c_get(AO_HMC5883_I2C_INDEX);
present = ao_i2c_start(AO_HMC5883_I2C_INDEX, HMC5883_ADDR_READ);
- ao_i2c_recv(NULL, 0, AO_HMC5883_I2C_INDEX, TRUE);
+ ao_i2c_recv(&d, 1, AO_HMC5883_I2C_INDEX, TRUE);
ao_i2c_put(AO_HMC5883_I2C_INDEX);
+
if (!present)
return 0;
+
+ ao_hmc5883_reg_write(HMC5883_CONFIG_A,
+ (HMC5883_CONFIG_A_MA_8 << HMC5883_CONFIG_A_MA) |
+ (HMC5883_CONFIG_A_DO_15 << HMC5883_CONFIG_A_DO) |
+ (HMC5883_CONFIG_A_MS_NORMAL << HMC5883_CONFIG_A_MS));
+
+ ao_hmc5883_reg_write(HMC5883_CONFIG_B,
+ (HMC5883_CONFIG_B_GN_1_3 << HMC5883_CONFIG_B_GN));
+
ao_hmc5883_configured = 1;
return 1;
}
{
ao_hmc5883_configured = 0;
+ ao_enable_port(AO_HMC5883_INT_PORT);
ao_exti_setup(&AO_HMC5883_INT_PORT,
AO_HMC5883_INT_PIN,
- AO_EXTI_MODE_FALLING,
+ AO_EXTI_MODE_FALLING | AO_EXTI_MODE_PULL_UP,
ao_hmc5883_isr);
ao_cmd_register(&ao_hmc5883_cmds[0]);
#define HMC5883_ADDR_READ 0x3d
#define HMC5883_CONFIG_A 0
+
+#define HMC5883_CONFIG_A_MA 5
+#define HMC5883_CONFIG_A_MA_1 0
+#define HMC5883_CONFIG_A_MA_2 1
+#define HMC5883_CONFIG_A_MA_4 2
+#define HMC5883_CONFIG_A_MA_8 3
+#define HMC5883_CONFIG_A_MA_MASK 3
+
+#define HMC5883_CONFIG_A_DO 2
+#define HMC5883_CONFIG_A_DO_0_75 0
+#define HMC5883_CONFIG_A_DO_1_5 1
+#define HMC5883_CONFIG_A_DO_3 2
+#define HMC5883_CONFIG_A_DO_7_5 3
+#define HMC5883_CONFIG_A_DO_15 4
+#define HMC5883_CONFIG_A_DO_30 5
+#define HMC5883_CONFIG_A_DO_75 6
+#define HMC5883_CONFIG_A_DO_MASK 7
+
+#define HMC5883_CONFIG_A_MS 0
+#define HMC5883_CONFIG_A_MS_NORMAL 0
+#define HMC5883_CONFIG_A_MS_POSITIVE_BIAS 1
+#define HMC5883_CONFIG_A_MS_NEGATIVE_BIAS 2
+#define HMC5883_CONFIG_A_MS_MASK 3
+
#define HMC5883_CONFIG_B 1
+
+#define HMC5883_CONFIG_B_GN 5
+#define HMC5883_CONFIG_B_GN_0_88 0
+#define HMC5883_CONFIG_B_GN_1_3 1
+#define HMC5883_CONFIG_B_GN_1_9 2
+#define HMC5883_CONFIG_B_GN_2_5 3
+#define HMC5883_CONFIG_B_GN_4_0 4
+#define HMC5883_CONFIG_B_GN_4_7 5
+#define HMC5883_CONFIG_B_GN_5_6 6
+#define HMC5883_CONFIG_B_GN_8_1 7
+#define HMC5883_CONFIG_B_GN_MASK 7
+
#define HMC5883_MODE 2
#define HMC5883_MODE_CONTINUOUS 0
#define HMC5883_MODE_SINGLE 1
#define HMC5883_MODE_IDLE 2
+
#define HMC5883_X_MSB 3
#define HMC5883_X_LSB 4
#define HMC5883_Y_MSB 5