bug fix: SS was not declared in the spi_write_and_read(.. function

Revision:
6:38fa8ac6e43b
Parent:
1:10feea6e63a8
--- a/platform_drivers.h	Tue Aug 27 09:38:19 2019 +0000
+++ b/platform_drivers.h	Fri Aug 30 15:47:06 2019 +0000
@@ -94,6 +94,7 @@
 #define i2c_init mbed_i2c_init
 #define i2c_read mbed_i2c_read
 #define i2c_write mbed_i2c_write
+#define MAX_SLAVE_SELECTS 8
 
 /******************************************************************************/
 /*************************** Types Declarations *******************************/