Kenji Arai / mbed-dev4BLE

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Fork of mbed-dev by mbed official

Diff: targets/TARGET_ONSEMI/TARGET_NCS36510/i2c.h

Revision:
178:79309dc6340a
Parent:
159:612c381a210f
diff -r d650f5d4c87a -r 79309dc6340a targets/TARGET_ONSEMI/TARGET_NCS36510/i2c.h
--- a/targets/TARGET_ONSEMI/TARGET_NCS36510/i2c.h	Wed Nov 08 13:50:44 2017 +0000
+++ b/targets/TARGET_ONSEMI/TARGET_NCS36510/i2c.h	Thu Nov 23 11:57:25 2017 +0000
@@ -48,7 +48,6 @@
 #define I2C_SPEED_400K_AT_8MHZ     (uint8_t)0x03
 #define I2C_SPEED_400K_AT_16MHZ    (uint8_t)0x08
 
-
 /* I2C commands */
 #define I2C_CMD_NULL          0x00
 #define I2C_CMD_WDAT0         0x10
@@ -93,7 +92,10 @@
 #define I2C_API_STATUS_SUCCESS    0
 #define PAD_REG_ADRS_BYTE_SIZE    4
 
-#define SEND_COMMAND(cmd)  while(!I2C_FIFO_EMPTY); wait_us(1); obj->membase->CMD_REG = cmd;
+// The wait_us(0) command is needed so the I2C state machines have enough
+// time for data to settle across all clock domain crossings in their
+// synchronizers, both directions.
+#define SEND_COMMAND(cmd) wait_us(0); obj->membase->CMD_REG = cmd; wait_us(0);
 
 /** Init I2C device.
  * @details
@@ -158,4 +160,4 @@
  */
 extern int32_t fI2cWriteB(i2c_t *d, const char *buf, int len);
 
-#endif /* I2C_H_ */
\ No newline at end of file
+#endif /* I2C_H_ */