}
implementation {
enum {
- BLOCKSIZE_DEFAULT = 64
- };
-
- #define saveBits(pin, pos, dir, out, ren) { \
- if (call pin.isOutput()) \
- dir |= (1 << pos); \
- if (call pin.getOut()) \
- out |= (1 << pos); \
- if (call pin.isRen()) \
- ren |= (1 << pos); \
- }
+ BLOCKSIZE_DEFAULT = 64,
- #define restoreBits(pin, pos, dir, out, ren) { \
- if (ren & (1 << pos)) \
- call pin.enableRen(); \
- else \
- call pin.disableRen(); \
- if (out & (1 << pos)) \
- call pin.set(); \
- else \
- call pin.clr(); \
- if (dir & (1 << pos)) \
- call pin.makeOutput(); \
- else \
- call pin.makeInput(); \
- }
-
- /* Pin IO configuration storage for later restoration */
- uint8_t m_dir;
- uint8_t m_out;
- uint8_t m_ren;
+ /* Bit positions in m_pins */
+ PINS_STE = 1,
+ PINS_SOMI,
+ PINS_SIMO,
+ PINS_CLK,
+ };
+ uint8_t m_pins;
uint8_t* m_txBuf;
uint8_t* m_rxBuf;
uint16_t m_len;
else
call Registers.clrStat(UCLISTEN);
- /* Save pin IO configuration */
- m_dir = m_out = m_ren = 0;
- if (is4pin())
- saveBits(STE, 0, m_dir, m_out, m_ren);
- saveBits(SIMO, 1, m_dir, m_out, m_ren);
- saveBits(SOMI, 2, m_dir, m_out, m_ren);
- saveBits(CLK, 3, m_dir, m_out, m_ren);
-
- /* Configure pins for SPI use */
- if (is4pin()) {
-#if 0 /* Unsure if REN on STE is a valid configuration */
- /* Configure STE pin for SPI use */
- if (config->ren & USCI_REN_STE) {
- if (config->ren & USCI_REN_STE_PULLUP)
- call STE.set();
- else
- call STE.clr();
- call STE.enableRen();
- }
-#endif
+ /* Configure pins for SPI, saving prior pin states */
+ m_pins = 0;
+ if (is4pin() && call STE.isIOFunc()) {
+ m_pins |= (1 << PINS_STE);
call STE.selectModuleFunc();
}
- call SOMI.makeInput();
- if (config->ren & USCI_REN_SOMI) {
- if (config->ren & USCI_REN_SOMI_PULLUP)
- call SOMI.set();
- else
- call SOMI.clr();
- call SOMI.enableRen();
+ if (call SOMI.isIOFunc()) {
+ m_pins |= (1 << PINS_SOMI);
+ call SOMI.selectModuleFunc();
}
- call SOMI.selectModuleFunc();
-#if 0 /* Unsure if REN on SIMO is a valid configuration */
- /* Configure SIMO pin for SPI use */
- if (config->ren & USCI_REN_SIMO) {
- if (config->ren & USCI_REN_SIMO_PULLUP)
- call SIMO.set();
- else
- call SIMO.clr();
- call SIMO.enableRen();
+ if (call SIMO.isIOFunc()) {
+ m_pins |= (1 << PINS_SIMO);
+ call SIMO.selectModuleFunc();
}
-#endif
- call SIMO.selectModuleFunc();
-#if 0 /* Unsure if REN on CLK is a valid configuration */
- /* Configure CLK pin for SPI use */
- if (config->ren & USCI_REN_CLK) {
- if (config->ren & USCI_REN_CLK_PULLUP)
- call CLK.set();
- else
- call CLK.clr();
- call CLK.enableRen();
+ if (call CLK.isIOFunc()) {
+ m_pins |= (1 << PINS_CLK);
+ call CLK.selectModuleFunc();
}
-#endif
- call CLK.selectModuleFunc();
/* Clear interrupts; we'll add them as needed */
call Registers.clrIeRx();
call Registers.clrIeRx();
call Registers.clrIfgRx();
- /* Restore pins to their preconfigured state */
-#if 0
- if (is4pin())
- restoreBits(STE, 0, m_dir, m_out, m_ren);
- restoreBits(SIMO, 1, m_dir, m_out, m_ren);
- restoreBits(SOMI, 1, m_dir, m_out, m_ren);
- restoreBits(CLK, 1, m_dir, m_out, m_ren);
-#endif
- if (is4pin())
+ /* Restore pins to their pre-configure state */
+ if (is4pin() && (m_pins & PINS_STE))
call STE.selectIOFunc();
- call SIMO.selectIOFunc();
- call SOMI.selectIOFunc();
- call CLK.selectIOFunc();
+ if (m_pins & PINS_SIMO)
+ call SIMO.selectIOFunc();
+ if (m_pins & PINS_SOMI)
+ call SOMI.selectIOFunc();
+ if (m_pins & PINS_CLK)
+ call CLK.selectIOFunc();
}
}