Changes between Version 3 and Version 4 of tim_driver

Timestamp:

Oct 25, 2014, 9:26:20 PM (10 years ago)

Author:

alain

Comment:

--

tim_driver

@@ -5 +5 @@
 The [source:soft/giet_vm/giet_drivers/tim_driver.c tim_driver.c] and [source:soft/giet_vm/giet_drivers/tim_driver.h tim_driver.h] files define the TIM driver. 
 
-The ''vci_multi_timer'' component is a multi-channels timer controller. 
+The ''vci_multi_timer'' component is a multi-channels timer controller. It is an ''external'' peripheral.
 
-For the GIET, it is an ''internal'' peripheral, replicated in each cluster.
+The total number of channels must be defined by the configuration parameter NB_TIM_CHANNELS in the ''hard_config.h'' file.
 
-The SEG_TIM_BASE address must be defined in the hard_config.h file.
+The user timers  are allocated to applications by the GIET-VM in the boot phase, as defined in the mapping. The corresponding global index is stored in the context of the task.
 
-There is two types of timers: 
- * '''kernel timers''' : one per processor, used for context switch. The local_id is in [0, NB_PROCS_MAX-1].
- * '''user timers''' : requested by the task in the mapping_info data structure. The local_id is in [NB_PROCS_MAX, NB_PROCS_MAX + NB_TIM_CHANNELS -1].
+The SEG_TIM_BASE address must be defined in the ''hard_config.h'' file.
 
-The global timer index is cluster_xy * (NB_PROCS_MAX + NB_TIM_CHANNELS) + local_id
-
-The virtual base address of the associated segment is:   vbase = SEG_TIM_BASE + cluster_xy * PERI_CLUSTER_INCREMENT
-
-The SEG_TIM_BASE, PERI_CLUSTER_INCREMENT, NB_PROCS_MAX and NB_TIM_CHANNELS values must be defined in hard_config.h file.
+The virtual base address of the associated segment is:   vbase = SEG_TIM_BASE + cluster_io << 32.
 
 The addressable registers map is defined [source:soft/giet_vm/giet_drivers/tim_driver.h here].