diff options
Diffstat (limited to 'src/sensor_mpu9250.c')
| -rw-r--r-- | src/sensor_mpu9250.c | 125 |
1 files changed, 27 insertions, 98 deletions
diff --git a/src/sensor_mpu9250.c b/src/sensor_mpu9250.c index d52de811..23c02921 100644 --- a/src/sensor_mpu9250.c +++ b/src/sensor_mpu9250.c @@ -2,7 +2,7 @@ // // Copyright (C) 2023 Matthew Swabey <matthew@swabey.org> // Copyright (C) 2022 Harry Beyel <harry3b9@gmail.com> -// Copyright (C) 2020-2021 Kevin O'Connor <kevin@koconnor.net> +// Copyright (C) 2020-2023 Kevin O'Connor <kevin@koconnor.net> // // This file may be distributed under the terms of the GNU GPLv3 license. @@ -17,27 +17,10 @@ #include "i2ccmds.h" // i2cdev_oid_lookup // Chip registers -#define AR_FIFO_SIZE 512 - -#define AR_PWR_MGMT_1 0x6B -#define AR_PWR_MGMT_2 0x6C -#define AR_FIFO_EN 0x23 -#define AR_ACCEL_OUT_XH 0x3B -#define AR_USER_CTRL 0x6A #define AR_FIFO_COUNT_H 0x72 #define AR_FIFO 0x74 #define AR_INT_STATUS 0x3A -#define SET_ENABLE_FIFO 0x08 -#define SET_DISABLE_FIFO 0x00 -#define SET_USER_FIFO_RESET 0x04 -#define SET_USER_FIFO_EN 0x40 - -#define SET_PWR_SLEEP 0x40 -#define SET_PWR_WAKE 0x00 -#define SET_PWR_2_ACCEL 0x07 // only enable accelerometers -#define SET_PWR_2_NONE 0x3F // disable all sensors - #define FIFO_OVERFLOW_INT 0x10 #define BYTES_PER_FIFO_ENTRY 6 @@ -53,24 +36,11 @@ struct mpu9250 { }; enum { - AX_HAVE_START = 1<<0, AX_RUNNING = 1<<1, AX_PENDING = 1<<2, + AX_PENDING = 1<<0, }; static struct task_wake mpu9250_wake; -// Reads the fifo byte count from the device. -static uint16_t -get_fifo_status (struct mpu9250 *mp) -{ - uint8_t reg[] = {AR_FIFO_COUNT_H}; - uint8_t msg[2]; - i2c_read(mp->i2c->i2c_config, sizeof(reg), reg, sizeof(msg), msg); - uint16_t fifo_bytes = ((msg[0] & 0x1f) << 8) | msg[1]; - if (fifo_bytes > mp->fifo_max) - mp->fifo_max = fifo_bytes; - return fifo_bytes; -} - // Event handler that wakes mpu9250_task() periodically static uint_fast8_t mpu9250_event(struct timer *timer) @@ -101,6 +71,19 @@ mp9250_reschedule_timer(struct mpu9250 *mp) irq_enable(); } +// Reads the fifo byte count from the device. +static uint16_t +get_fifo_status(struct mpu9250 *mp) +{ + uint8_t reg[] = {AR_FIFO_COUNT_H}; + uint8_t msg[2]; + i2c_read(mp->i2c->i2c_config, sizeof(reg), reg, sizeof(msg), msg); + uint16_t fifo_bytes = ((msg[0] & 0x1f) << 8) | msg[1]; + if (fifo_bytes > mp->fifo_max) + mp->fifo_max = fifo_bytes; + return fifo_bytes; +} + // Query accelerometer data static void mp9250_query(struct mpu9250 *mp, uint8_t oid) @@ -123,82 +106,35 @@ mp9250_query(struct mpu9250 *mp, uint8_t oid) // otherwise schedule timed wakeup if (mp->fifo_pkts_bytes >= BYTES_PER_BLOCK) { sched_wake_task(&mpu9250_wake); - } else if (mp->flags & AX_RUNNING) { - sched_del_timer(&mp->timer); + } else { mp->flags &= ~AX_PENDING; mp9250_reschedule_timer(mp); } } -// Startup measurements -static void -mp9250_start(struct mpu9250 *mp, uint8_t oid) -{ - sched_del_timer(&mp->timer); - mp->flags = AX_RUNNING; - uint8_t msg[2]; - - msg[0] = AR_FIFO_EN; - msg[1] = SET_DISABLE_FIFO; // disable FIFO - i2c_write(mp->i2c->i2c_config, sizeof(msg), msg); - - msg[0] = AR_USER_CTRL; - msg[1] = SET_USER_FIFO_RESET; // reset FIFO buffer - i2c_write(mp->i2c->i2c_config, sizeof(msg), msg); - - msg[0] = AR_USER_CTRL; - msg[1] = SET_USER_FIFO_EN; // enable FIFO buffer access - i2c_write(mp->i2c->i2c_config, sizeof(msg), msg); - - uint8_t int_reg[] = {AR_INT_STATUS}; // clear FIFO overflow flag - i2c_read(mp->i2c->i2c_config, sizeof(int_reg), int_reg, 1, msg); - - msg[0] = AR_FIFO_EN; - msg[1] = SET_ENABLE_FIFO; // enable accel output to FIFO - i2c_write(mp->i2c->i2c_config, sizeof(msg), msg); - - mp9250_reschedule_timer(mp); -} - -// End measurements -static void -mp9250_stop(struct mpu9250 *mp, uint8_t oid) -{ - // Disable measurements - sched_del_timer(&mp->timer); - mp->flags = 0; - - // disable accel FIFO - uint8_t msg[2] = { AR_FIFO_EN, SET_DISABLE_FIFO }; - i2c_write(mp->i2c->i2c_config, sizeof(msg), msg); - - // Uncomment and rebuilt to check for FIFO overruns when tuning - //output("mpu9240 limit_count=%u fifo_max=%u", - // mp->limit_count, mp->fifo_max); -} - void command_query_mpu9250(uint32_t *args) { struct mpu9250 *mp = oid_lookup(args[0], command_config_mpu9250); - if (!args[2]) { + sched_del_timer(&mp->timer); + mp->flags = 0; + if (!args[1]) { // End measurements - mp9250_stop(mp, args[0]); + + // Uncomment and rebuilt to check for FIFO overruns when tuning + //output("mpu9240 fifo_max=%u", mp->fifo_max); return; } + // Start new measurements query - sched_del_timer(&mp->timer); - mp->timer.waketime = args[1]; - mp->rest_ticks = args[2]; - mp->flags = AX_HAVE_START; + mp->rest_ticks = args[1]; sensor_bulk_reset(&mp->sb); mp->fifo_max = 0; mp->fifo_pkts_bytes = 0; - sched_add_timer(&mp->timer); + mp9250_reschedule_timer(mp); } -DECL_COMMAND(command_query_mpu9250, - "query_mpu9250 oid=%c clock=%u rest_ticks=%u"); +DECL_COMMAND(command_query_mpu9250, "query_mpu9250 oid=%c rest_ticks=%u"); void command_query_mpu9250_status(uint32_t *args) @@ -235,15 +171,8 @@ mpu9250_task(void) struct mpu9250 *mp; foreach_oid(oid, mp, command_config_mpu9250) { uint_fast8_t flags = mp->flags; - if (!(flags & AX_PENDING)) { - continue; - } - if (flags & AX_HAVE_START) { - mp9250_start(mp, oid); - } - else { + if (flags & AX_PENDING) mp9250_query(mp, oid); - } } } DECL_TASK(mpu9250_task); |