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lis3dh_reset() and bit fiddle to prevent overwriting regs in case of user issue

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This commit is contained in:
William Clark 2023-12-30 20:22:29 +00:00
parent cf48f7db54
commit 16b40de1e1
3 changed files with 64 additions and 57 deletions
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113
lis3dh.c
View File

@ -3,38 +3,6 @@
#include "lis3dh.h"
#include "registers.h"
/* reset user regs and reload trim params */
static int lis3dh_reset(lis3dh_t *lis3dh) {
int err = 0;
/* set BOOT bit so device reloads internal trim parameters */
err |= lis3dh->dev.write(REG_CTRL_REG5, 0x80);
/* write default values to rw regs */
err |= lis3dh->dev.write(REG_CTRL_REG0, 0x10);
err |= lis3dh->dev.write(REG_CTRL_REG1, 0x07);
err |= lis3dh->dev.write(REG_CTRL_REG2, 0x00);
err |= lis3dh->dev.write(REG_CTRL_REG3, 0x00);
err |= lis3dh->dev.write(REG_CTRL_REG4, 0x00);
err |= lis3dh->dev.write(REG_CTRL_REG5, 0x00);
err |= lis3dh->dev.write(REG_CTRL_REG6, 0x00);
err |= lis3dh->dev.write(REG_FIFO_CTRL_REG, 0x00);
err |= lis3dh->dev.write(REG_INT1_CFG, 0x00);
err |= lis3dh->dev.write(REG_INT1_THS, 0x00);
err |= lis3dh->dev.write(REG_INT1_DURATION, 0x00);
err |= lis3dh->dev.write(REG_INT2_CFG, 0x00);
err |= lis3dh->dev.write(REG_INT2_THS, 0x00);
err |= lis3dh->dev.write(REG_INT2_DURATION, 0x00);
err |= lis3dh->dev.write(REG_CLICK_CFG, 0x00);
err |= lis3dh->dev.write(REG_CLICK_THS, 0x00);
err |= lis3dh->dev.write(REG_TIME_LIMIT, 0x00);
err |= lis3dh->dev.write(REG_TIME_LATENCY, 0x00);
err |= lis3dh->dev.write(REG_TIME_WINDOW, 0x00);
err |= lis3dh->dev.write(REG_ACT_THS, 0x00);
err |= lis3dh->dev.write(REG_ACT_DUR, 0x00);
return err;
}
int lis3dh_init(lis3dh_t *lis3dh) {
uint8_t result;
@ -63,8 +31,6 @@ int lis3dh_init(lis3dh_t *lis3dh) {
lis3dh->cfg.filter.mode = 0xFF; /* in use if neq 0xFF */
lis3dh->cfg.filter.fds = 1; /* bypass OFF by default */
err |= lis3dh_reset(lis3dh);
return err;
}
@ -111,23 +77,23 @@ int lis3dh_configure(lis3dh_t *lis3dh) {
ctrl_reg5 |= (lis3dh->cfg.int_pin2.latch & 1) << 1;
/* set INT1_CFG and INT2_CFG */
int1_cfg |= (lis3dh->cfg.int1_cfg.xl);
int1_cfg |= (lis3dh->cfg.int1_cfg.xh) << 1;
int1_cfg |= (lis3dh->cfg.int1_cfg.yl) << 2;
int1_cfg |= (lis3dh->cfg.int1_cfg.yh) << 3;
int1_cfg |= (lis3dh->cfg.int1_cfg.zl) << 4;
int1_cfg |= (lis3dh->cfg.int1_cfg.zh) << 5;
int1_cfg |= (lis3dh->cfg.int1_cfg.det_6d) << 6;
int1_cfg |= (lis3dh->cfg.int1_cfg.aoi) << 7;
int1_cfg |= (lis3dh->cfg.int1_cfg.xl & 1);
int1_cfg |= (lis3dh->cfg.int1_cfg.xh & 1) << 1;
int1_cfg |= (lis3dh->cfg.int1_cfg.yl & 1) << 2;
int1_cfg |= (lis3dh->cfg.int1_cfg.yh & 1) << 3;
int1_cfg |= (lis3dh->cfg.int1_cfg.zl & 1) << 4;
int1_cfg |= (lis3dh->cfg.int1_cfg.zh & 1) << 5;
int1_cfg |= (lis3dh->cfg.int1_cfg.det_6d & 1) << 6;
int1_cfg |= (lis3dh->cfg.int1_cfg.aoi & 1) << 7;
int2_cfg |= (lis3dh->cfg.int2_cfg.xl);
int2_cfg |= (lis3dh->cfg.int2_cfg.xh) << 1;
int2_cfg |= (lis3dh->cfg.int2_cfg.yl) << 2;
int2_cfg |= (lis3dh->cfg.int2_cfg.yh) << 3;
int2_cfg |= (lis3dh->cfg.int2_cfg.zl) << 4;
int2_cfg |= (lis3dh->cfg.int2_cfg.zh) << 5;
int2_cfg |= (lis3dh->cfg.int2_cfg.det_6d) << 6;
int2_cfg |= (lis3dh->cfg.int2_cfg.aoi) << 7;
int2_cfg |= (lis3dh->cfg.int2_cfg.xl & 1);
int2_cfg |= (lis3dh->cfg.int2_cfg.xh & 1) << 1;
int2_cfg |= (lis3dh->cfg.int2_cfg.yl & 1) << 2;
int2_cfg |= (lis3dh->cfg.int2_cfg.yh & 1) << 3;
int2_cfg |= (lis3dh->cfg.int2_cfg.zl & 1) << 4;
int2_cfg |= (lis3dh->cfg.int2_cfg.zh & 1) << 5;
int2_cfg |= (lis3dh->cfg.int2_cfg.det_6d & 1) << 6;
int2_cfg |= (lis3dh->cfg.int2_cfg.aoi & 1) << 7;
int1_dur = lis3dh->cfg.int1_dur & 0x7F;
int2_dur = lis3dh->cfg.int2_dur & 0x7F;
@ -172,12 +138,7 @@ int lis3dh_configure(lis3dh_t *lis3dh) {
ctrl_reg1 |= 0x08;
}
err |= lis3dh->dev.write(REG_CTRL_REG1, ctrl_reg1);
err |= lis3dh->dev.write(REG_CTRL_REG2, ctrl_reg2);
err |= lis3dh->dev.write(REG_CTRL_REG3, ctrl_reg3);
err |= lis3dh->dev.write(REG_CTRL_REG4, ctrl_reg4);
err |= lis3dh->dev.write(REG_CTRL_REG5, ctrl_reg5);
err |= lis3dh->dev.write(REG_CTRL_REG6, ctrl_reg6);
/* write these before the control regs that start the device */
err |= lis3dh->dev.write(REG_FIFO_CTRL_REG, fifo_ctrl_reg);
err |= lis3dh->dev.write(REG_INT1_CFG, int1_cfg);
err |= lis3dh->dev.write(REG_INT1_THS, int1_ths);
@ -186,6 +147,14 @@ int lis3dh_configure(lis3dh_t *lis3dh) {
err |= lis3dh->dev.write(REG_INT2_THS, int2_ths);
err |= lis3dh->dev.write(REG_INT2_DURATION, int2_dur);
err |= lis3dh->dev.write(REG_CTRL_REG1, ctrl_reg1);
err |= lis3dh->dev.write(REG_CTRL_REG2, ctrl_reg2);
err |= lis3dh->dev.write(REG_CTRL_REG3, ctrl_reg3);
err |= lis3dh->dev.write(REG_CTRL_REG4, ctrl_reg4);
err |= lis3dh->dev.write(REG_CTRL_REG5, ctrl_reg5);
err |= lis3dh->dev.write(REG_CTRL_REG6, ctrl_reg6);
/* read REFERENCE to clear internal filter struct */
err |= lis3dh->dev.read(REG_REFERENCE, &ref, 1);
@ -326,4 +295,36 @@ int lis3dh_clear_int2(lis3dh_t *lis3dh) {
int lis3dh_reference(lis3dh_t *lis3dh) {
uint8_t res;
return lis3dh->dev.read(REG_REFERENCE, &res, 1);
}
/* reset user regs and reload trim params */
int lis3dh_reset(lis3dh_t *lis3dh) {
int err = 0;
/* set BOOT bit so device reloads internal trim parameters */
err |= lis3dh->dev.write(REG_CTRL_REG5, 0x80);
/* write default values to rw regs */
err |= lis3dh->dev.write(REG_CTRL_REG0, 0x10);
err |= lis3dh->dev.write(REG_CTRL_REG1, 0x07);
err |= lis3dh->dev.write(REG_CTRL_REG2, 0x00);
err |= lis3dh->dev.write(REG_CTRL_REG3, 0x00);
err |= lis3dh->dev.write(REG_CTRL_REG4, 0x00);
err |= lis3dh->dev.write(REG_CTRL_REG5, 0x00);
err |= lis3dh->dev.write(REG_CTRL_REG6, 0x00);
err |= lis3dh->dev.write(REG_FIFO_CTRL_REG, 0x00);
err |= lis3dh->dev.write(REG_INT1_CFG, 0x00);
err |= lis3dh->dev.write(REG_INT1_THS, 0x00);
err |= lis3dh->dev.write(REG_INT1_DURATION, 0x00);
err |= lis3dh->dev.write(REG_INT2_CFG, 0x00);
err |= lis3dh->dev.write(REG_INT2_THS, 0x00);
err |= lis3dh->dev.write(REG_INT2_DURATION, 0x00);
err |= lis3dh->dev.write(REG_CLICK_CFG, 0x00);
err |= lis3dh->dev.write(REG_CLICK_THS, 0x00);
err |= lis3dh->dev.write(REG_TIME_LIMIT, 0x00);
err |= lis3dh->dev.write(REG_TIME_LATENCY, 0x00);
err |= lis3dh->dev.write(REG_TIME_WINDOW, 0x00);
err |= lis3dh->dev.write(REG_ACT_THS, 0x00);
err |= lis3dh->dev.write(REG_ACT_DUR, 0x00);
return err;
}

1
lis3dh.h
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@ -179,5 +179,6 @@ int lis3dh_read_fifo(lis3dh_t *lis3dh, struct lis3dh_fifo_data *fifo);
int lis3dh_clear_int1(lis3dh_t *lis3dh);
int lis3dh_clear_int2(lis3dh_t *lis3dh);
int lis3dh_reference(lis3dh_t *lis3dh);
int lis3dh_reset(lis3dh_t *lis3dh);
#endif

7
main.c
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@ -36,11 +36,16 @@ int main() {
lis.dev.deinit = i2c_deinit;
/* initialise struct */
/* initialise LIS3DH struct */
if (lis3dh_init(&lis)) {
quit("init()", &lis);
}
/* reset device because it sometimes corrupts itself */
if (lis3dh_reset(&lis)) {
quit("reset()", &lis);
}
/* register interrupt */
if (int_register(GPIO_INTERRUPT_PIN_INT1)) {
quit("int_register()", &lis);