A MSC represents the time sequential order of events and transactions between several entities. The example below consists of the entities e1 and e2. At first the entity e2 is in the state [S]. The entity e1 gets an external event
foo()
, which e.g. can be function call. As reaction of this function call entity e1 sends the event bar()
to entity e2. The timer t1
is started as reaction to the event bar()
at entity e2. The timer expires 10ms later and this timer event causes the entity e2 to send an event BAR_END
to entity e1. The entity e1 now generates a return
event.
More information about MSCs can be found here.
The MSCs used in this manual consist of two entities, the first entity MCU refers to the programm, running on the controller and the entity AT86RF230 refers to the radio transceiver. At the end of each MSC there are C-Code fragments, which show the sequence of the function calls for the current use case. These code fragments just show a time sequential order of function calls but they do not describe a valid driver implementation for the radio transceiver.
The following diagrams explain the MSC primitives, which are used in this manual:
[pin] : Setting levels of control pins.
[reg] : Read and write registers.
[sreg] : Read and write sub registers.
[frm] : Read and write frames.
[sram] : Read and write the SRAM.
trx_pinset_reset(0); trx_pinset_slptr(0); irqstat = trx_reg_read(RG_IRQ_STATUS); trx_reg_write(RG_IRQ_MASK, mask); val = trx_bit_read(SR_TRX_STATUS); trx_bit_write(SR_TRX_CMD, CMD_FORCE_TRX_OFF); rxframe = trx_frame_read(); trx_frame_write(len(txframe), txframe); trx_sram_read(len, addr, var); trx_sram_write(array_var);
[tmr] : A defined time, which needs to be waited until the result of a transaction or event is available.
[wait] : An IRQ, that has to occur within a determined time.
[async] : An interrupt that occurs asynchronously, like in the frame receive event.
[assert] : A parameter which is checked against a register value from the radio transceiver.
delay_us(25); delay_us(150); /* TRX_IRQ_PLL_LOCK occurs within this period */ /* TRX_IRQ_RX_START occurs here */ state = trx_bit_read(SR_TRX_STATUS); ASSERT(state==TRX_OFF);