From fa1ecda3fdaecd89b86bb63930a6521c8f63fe90 Mon Sep 17 00:00:00 2001
From: Damien George <damien.p.george@gmail.com>
Date: Thu, 31 Jul 2014 10:39:52 +0100
Subject: [PATCH] stmhal, accel: Increase start-up times to 30ms; add extra
30ms delay.
For accel to start-up reliably, need to wait 30ms between on/off, and
30ms for it to enter active mode. With this fix the accel can be read
immediately after initialising it.
Addresses issue #763.
---
stmhal/accel.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
diff --git a/stmhal/accel.c b/stmhal/accel.c
index cfc80f9d3..e846ca4e7 100644
--- a/stmhal/accel.c
+++ b/stmhal/accel.c
@@ -83,11 +83,11 @@ STATIC void accel_start(void) {
I2CHandle1.Init.OwnAddress2 = 0xfe; // unused
i2c_init(&I2CHandle1);
- // turn off AVDD, wait 20ms, turn on AVDD, wait 20ms again
+ // turn off AVDD, wait 30ms, turn on AVDD, wait 30ms again
GPIOB->BSRRH = GPIO_PIN_5; // turn off
- HAL_Delay(20);
+ HAL_Delay(30);
GPIOB->BSRRL = GPIO_PIN_5; // turn on
- HAL_Delay(20);
+ HAL_Delay(30);
HAL_StatusTypeDef status;
@@ -100,11 +100,12 @@ STATIC void accel_start(void) {
}
}
- //printf("MemWrite\n");
- uint8_t data[1];
- data[0] = 1; // active mode
+ // set MMA to active mode
+ uint8_t data[1] = {1}; // active mode
status = HAL_I2C_Mem_Write(&I2CHandle1, MMA_ADDR, MMA_REG_MODE, I2C_MEMADD_SIZE_8BIT, data, 1, 200);
- //printf(" got %d\n", status);
+
+ // wait for MMA to become active
+ HAL_Delay(30);
}
/******************************************************************************/
--
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