Antonio Quevedo / TSIHW

This is a VERY low-level library for controlling the TSI hardware module in a KL25 microcontroller. The programmer creates the TSI object passing basic parameters, and selects the active channels. Then, a scan on a given channel can be started, and the raw result can be read.

Diff: Registers.txt

Revision:
0:b39f4f954a9b
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Registers.txt	Wed Sep 24 18:48:10 2014 +0000
@@ -0,0 +1,51 @@
+/*
+TSI REGISTERS
+------------------------------------------
+
+TSI0_GENCS:
+Bit 31: OUTRGF; Out-of-range flag; set if result register is out of the range given by TSI_THRESHOLD; write 1 to clear
+Bit 28: ESOR; Selector for End-of-scan (set) or out-of-range (clear) interrupt source
+Bits 27-24: MODE; defines analog mode; keep bits 25-24 to 00
+    0000: capacitive sensing (non-noise detection)
+    0100: Single threshold noise detection mode; frequency limitation disabled
+    1000: Single threshold noise detection mode; frequency limitation enabled
+    1100: Automatic noise detection mode
+Bits 23-21: REFCHRG; current value for charging the reference oscillator
+    000: 500nA
+    001: 1uA
+    010: 2uA
+    011: 4uA
+    100: 8uA
+    101: 16uA
+    110: 32uA
+    111: 64uA
+Bits 20-19: DVOLT; oscillator's voltage rails
+    00: DV = 1.03V; Vp = 1.33V; Vm = 0.30V
+    01: DV = 0.73V; Vp = 1.18V; Vm = 0.45V
+    10: DV = 0.43V; Vp = 1.03V; Vm = 0.60V
+    11: DV = 0.29V; Vp = 0.95V; Vm = 0.67V
+Bits 18-16: EXTCHRG; current value for charging the electrode oscillator
+    Same values as for REFCHRG
+Bits 15-13: PS; electrode oscillator prescaler
+    Value is 2 to the power of the number given by the three bits (0-7)
+Bits 12-8: NSCN; Number of scans for each electrode
+    Value is the number given by the five bits (0-31) plus 1.
+Bit 7: TSIEN; TSI enable; set to enable
+Bit 6: TSIIEN; TSI interrupt enable; set to enable
+Bit 5: STPE; STOP enable; set to allow TSI to run in low-power modes
+Bit 4: STM; Scan Trigger Mode; clear to software and set to hardware
+Bit 3: SCNIP; Scan In Progress status; set if there is a scan in progress
+Bit 2: EOSF; End of Scan Flag; set if scan complete
+Bit 1: CURSW; Current sources swapped; set if swapped
+
+TSI0_DATA:
+Bits 31-28: TSICH; current channel to be measured (4 bits, values 0 to 15)
+Bit 23: DMAEN; DMA enabled; set for DMA transfer instead of interrupt
+Bit 22: SWTS; Software Trigger Start; write 1 to start scan if software trigger was selected
+Bit 15-0: TSICNT; TSI Conversion Counter; record the accumulated scan counter value ticked by the reference oscillator
+
+TSI0_TSHD:
+Threshold value
+----------------------------------------------------
+
+*/
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