From 8911be0f320df6ad457783058df1365eec8ede06 Mon Sep 17 00:00:00 2001
From: William Clark <wrvc96@gmail.com>
Date: Wed, 22 Nov 2023 11:48:03 +0000
Subject: [PATCH] user-provided 'sleep' func, for targets without usleep()

---
 bme680.c                   | 7 ++-----
 bme680.h                   | 1 +
 example/continuous.c       | 5 +++++
 example/iterate_setpoint.c | 5 +++++
 i2c.c                      | 6 ++++++
 main.c                     | 4 ++++
 spi.c                      | 6 ++++++
 7 files changed, 29 insertions(+), 5 deletions(-)

diff --git a/bme680.c b/bme680.c
index 6d845d4..22cbdd6 100644
--- a/bme680.c
+++ b/bme680.c
@@ -1,7 +1,4 @@
-#define _DEFAULT_SOURCE
-
 #include <stdio.h>
-#include <unistd.h>
 
 #include "bme680.h"
 #include "registers.h"
@@ -147,7 +144,7 @@ int bme680_reset(bme680_t *bme680) {
 	}
 
 	ret = bme680->dev.write(reg, magic);
-	usleep(2000); /* sleep for 2 ms */
+	bme680->dev.sleep(2000); /* sleep for 2 ms */
 
 	return ret;
 }
@@ -215,7 +212,7 @@ int bme680_poll(bme680_t *bme680) {
 
 
 	do {
-		usleep(5000); /* 5 ms */
+		bme680->dev.sleep(5000); /* 5 ms */
 		err |= read_dev(bme680, REG_MEAS_STATUS, &meas_status, 1);
 		gas_measuring = (meas_status >> 6) & 1;
 		any_measuring = (meas_status >> 5) & 1;
diff --git a/bme680.h b/bme680.h
index 87b1865..2fff9f0 100644
--- a/bme680.h
+++ b/bme680.h
@@ -50,6 +50,7 @@ struct bme680_dev {
 	int (*init)   (void);
 	int (*read)   (uint8_t reg, uint8_t *dst, uint32_t size);
 	int (*write)  (uint8_t reg, uint8_t value);
+	int (*sleep)  (uint32_t dur_ms);
 	int (*deinit) (void);
 };
 
diff --git a/example/continuous.c b/example/continuous.c
index dcaab7a..f9372a1 100644
--- a/example/continuous.c
+++ b/example/continuous.c
@@ -1,3 +1,6 @@
+/* for usleep() */
+#define _DEFAULT_SOURCE 
+
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -23,6 +26,8 @@ int main(void) {
 	bme680.dev.write  = spi_write;
 	bme680.dev.deinit = spi_deinit;
 
+	bme680.dev.sleep  = usleep;
+
 	mode = BME680_MODE_FLOAT | BME680_SPI | BME680_ENABLE_GAS;
 
 	if (bme680_init(&bme680, mode) != 0) {
diff --git a/example/iterate_setpoint.c b/example/iterate_setpoint.c
index 705b46b..9798d55 100644
--- a/example/iterate_setpoint.c
+++ b/example/iterate_setpoint.c
@@ -1,3 +1,6 @@
+/* for usleep() */
+#define _DEFAULT_SOURCE 
+
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -28,6 +31,8 @@ int main(void) {
 	bme680.dev.write  = spi_write;
 	bme680.dev.deinit = spi_deinit;
 
+	bme680.dev.sleep  = usleep;
+
 	mode = BME680_MODE_FLOAT | BME680_SPI | BME680_ENABLE_GAS;
 
 	if (bme680_init(&bme680, mode) != 0) {
diff --git a/i2c.c b/i2c.c
index 57f65d6..6e8e22c 100644
--- a/i2c.c
+++ b/i2c.c
@@ -1,3 +1,9 @@
+/* 
+
+Example I2C use on linux/raspberry pi
+
+*/
+
 #include <stdio.h>
 #include <fcntl.h>
 #include <linux/i2c.h>
diff --git a/main.c b/main.c
index 28b1dea..6b3d181 100644
--- a/main.c
+++ b/main.c
@@ -1,3 +1,5 @@
+/* for usleep() */
+#define _DEFAULT_SOURCE 
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -28,6 +30,8 @@ int main(void) {
 	bme680.dev.write  = spi_write;
 	bme680.dev.deinit = spi_deinit;
 
+	bme680.dev.sleep  = usleep;
+
 	/* 2. set the device mode */
 	mode = BME680_MODE_FLOAT | BME680_SPI | BME680_ENABLE_GAS;
 	/*     BME680_MODE_INT   | BME680_I2C; */
diff --git a/spi.c b/spi.c
index 5e31024..48b88c6 100644
--- a/spi.c
+++ b/spi.c
@@ -1,3 +1,9 @@
+/* 
+
+Example SPI use on linux/raspberry pi
+
+*/
+
 #include <stdio.h>
 #include <stdint.h>
 #include <unistd.h>