X-Git-Url: https://oss.titaniummirror.com/gitweb/?a=blobdiff_plain;f=tos%2Fchips%2Fmsp430%2Fusci%2FMsp430UartP.nc;h=4821f7b67a9b910c5398b2a1a1b4a8d28805cfe2;hb=a04046a3331f1baba1e6a568613fec5db58bbe7b;hp=f00e704f1c1425dff959feb425900d0596b2c4e1;hpb=10acc57d16a648d746eed9d5c6264850f7c52fde;p=tinyos-2.x.git

diff --git a/tos/chips/msp430/usci/Msp430UartP.nc b/tos/chips/msp430/usci/Msp430UartP.nc
index f00e704f..4821f7b6 100644
--- a/tos/chips/msp430/usci/Msp430UartP.nc
+++ b/tos/chips/msp430/usci/Msp430UartP.nc
@@ -26,13 +26,16 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
  * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
- 
+
 /**
  * Uart implementation using a USCI device.
  *
- * @author R. Steve McKown <smckown@gmail.com>
+ * TODO: Implement blocking like in Msp430UartSpiP.nc.
+ *       Implement error checking via UCAxSTAT.
+ *
+ * @author R. Steve McKown <rsmckown@gmail.com>
  */
- 
+
 generic module Msp430UartP() {
   provides {
     interface UartStream;
@@ -44,165 +47,254 @@ generic module Msp430UartP() {
     interface HplMsp430UsciInt as Interrupts;
     interface HplMsp430GeneralIO as RXD;
     interface HplMsp430GeneralIO as TXD;
-    interface Msp430UsciUartConfigure; /* maybe just Msp430UsciConfigure */
-    interface Counter<T32khz,uint16_6>
+    interface AsyncConfigure<const msp430_usci_uart_t*> as Configure;
+    interface Counter<T32khz,uint16_t>;
     interface ArbiterInfo;
   }
 }
 implementation {
-  #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); \
-	}
+  enum {
+    /* Bit positions in m_pins */
+    PINS_RXD = 0,
+    PINS_TXD
+  };
 
-  #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(); \
-	}
+  uint8_t m_pins;
+  uint8_t* m_sobuf; 	/* Original buffer ptr from UartStream.send() */
+  uint16_t m_solen;	/* Original buffer len from UartStream.send() */
+  uint8_t* m_sbuf;	/* Position of next char to send */
+  uint16_t m_slen;	/* Len of chars in m_sbuf to send */
+  bool m_rxie;		/* Set if rxie has been enabled to UartStream.receive() */
+  uint8_t* m_robuf;	/* Original receive buffer */
+  uint16_t m_rolen;	/* Original (maximum) receive len */
+  uint8_t* m_rbuf;	/* Position of next byte in which to receive a char */
+  uint16_t m_rlen;	/* Remaining length in receive buffer */
+
+  sfrb(MYBRX, 219U);
 
-  uint8_t dir; /* Pin state storage to allow for proper unconfiguration */
-  uint8_t out;
-  uint8_t ren;
-  uint8_t* sobuf; /* Original buffer ptr from UartStream.send() */
-  uint8_t solen;	/* Original buffer len from UartStream.send() */
-  uint8_t* sbuf; /* Position of next char to send */
-  uint8_t slen;	/* Len of chars in sbuf to send */
-  bool rxie;	/* Set if rxie has been enabled to UartStream.receive() */
-  uint8_t* robuf; /* Original receive buffer */
-  uint8_t rolen; /* Original (maximum) receive len */
-  uint8_t* rbuf; /* Position of next byte in which to receive a char */
-  uint8_t rlen; /* Remaining length in receive buffer */
-
-  async command void ResourceConfigure.configure();
+  async command void ResourceConfigure.configure()
   {
-    call Registers.setCtl0(UCSYNC);
-    /* Save pin states */
-    dir = out = ren = 0;
-    saveBits(RXD, 0, dir, out, ren);
-    saveBits(TXD, 1, dir, out, ren);
-    /* FIXME: use Msp430UsciConfig to configure ports */
-    /* FIXME: we may need to have REN/DIR stuff in the configuration... */
-    call RXD.selectModuleFunc();
-    call TXD.selectModuleFunc();
-    /* Clear interrupts; we'll add them as needed */
-    call Registers.clrCtl1(UCRXEIE|UCBRKIE);
-    call Registers.clrIeRx();
-    call Registers.clrIeTx();
-    /* Enable the device */
-    call Registers.clrCtl0(UCSYNC);
+    atomic {
+      const msp430_usci_uart_t* config = call Configure.get();
+
+      call Registers.setCtl1(UCSWRST);
+
+      /* Configure USCI registers */
+      call Registers.assignCtl0(config->ctl0 & ~UCSYNC);
+      call Registers.assignCtl1(config->ctl1 | UCSWRST);
+      call Registers.assignBr0(config->brx & 0xff);
+      call Registers.assignBr1(config->brx >> 8);
+      call Registers.assignMctl(config->mctl);
+      call Registers.assignIrtctl(config->irtctl);
+      call Registers.assignIrrctl(config->irrctl);
+      call Registers.assignAbctl(config->abctl);
+      if (config->uclisten)
+	call Registers.setStat(UCLISTEN);
+      else
+	call Registers.clrStat(UCLISTEN);
+
+      /* Configure pins for UART, saving prior pin states */
+      m_pins = 0;
+      if (call RXD.isIOFunc()) {
+	m_pins |= (1 << PINS_RXD);
+	call RXD.selectModuleFunc();
+      }
+      if (call TXD.isIOFunc()) {
+	m_pins |= (1 << PINS_TXD);
+	call TXD.selectModuleFunc();
+      }
+
+      /* Reset important state variables */
+      m_robuf = 0;
+      m_sobuf = 0;
+
+      /* Clear interrupts; we'll add them as needed */
+      call Registers.clrIeRx();
+      call Registers.clrIeTx();
+
+      /* Enable the device */
+      call Registers.clrCtl1(UCSWRST);
+
+      /* TOS convention is for receive interrupts on by default. */
+      call Registers.clrIfgRx();
+      call Registers.setIeRx();
+    }
   }
 
-  async command void ResourceConfigure.unconfigure();
+  async command void ResourceConfigure.unconfigure()
   {
-    /* Disable the device */
-    call Registers.setCtl0(UCSYNC);
-    /* Clear interrupts and interrupt flags */
-    call Registers.clrIeRx();
-    call Registers.clrIeTx();
-    call Registers.clrIfgRx();
-    call Registers.clrIfgTx();
-    /* Restore pins to state just before configure() */
-    restoreBits(RXD, 0, dir, out, ren);
-    restoreBits(TXD, 0, dir, out, ren);
-    call RXD.selectIOFunc();
-    call TXD.selectIOFunc();
+    atomic {
+      /* Disable the device */
+      call Registers.setCtl1(UCSWRST);
+
+      /* Clear interrupts and interrupt flags */
+      call Registers.clrIeRx();
+      call Registers.clrIeTx();
+      call Registers.clrIfgRx();
+
+      /* Reset important state variables */
+      m_robuf = 0;
+      m_sobuf = 0;
+
+      /* Restore pins to their pre-configure state */
+      if (m_pins & (1 << PINS_RXD))
+	call RXD.selectIOFunc();
+      if (m_pins & (1 << PINS_TXD))
+	call TXD.selectIOFunc();
+    }
   }
 
+  async command error_t UartByte.send(uint8_t byte)
+  {
+    atomic {
+      while (!call Registers.getIfgTx());
+      call Registers.setTxbuf(byte);
+      return SUCCESS;
+    }
+  }
 
-  async command error_t UartStream.send( uint8_t* buf, uint16_t len )
+  async command error_t UartStream.send(uint8_t* buf, uint16_t len)
   {
-    if (sobuf || !buf || !len)
-      return FAIL;
-    sobuf = buf;
-    solen = len;
-    call Registers.setIeTx();
-    call Registers.setTxbuf(*sobuf);
-    slen = solen - 1;
-    if (slen)
-      sbuf = sobuf + 1;
-    return SUCCESS;
+    atomic {
+      if (m_sobuf || !buf || !len)
+	return FAIL;
+      m_sbuf = m_sobuf = buf;
+      m_slen = m_solen = len;
+      call Registers.setIeTx();
+      return SUCCESS;
+    }
   }
 
   async event void Interrupts.tx()
   {
-    while (slen && call Registers.getIfgTx()) {
-      call Registers.setTxbuf(*sbuf);
-      if (--slen)
-	sbuf++;
-    }
-    if (slen == 0 && sobuf) {
-      call Registers.clrIeTx();
-      call Registers.clrIfgTx();
-      sobuf = 0;
-      signal UartStream.sendDone(sobuf, solen, SUCCESS);
+    /* FIXME: this can cause an arbitrarily long ISR, if m_slen is large.
+     * But depending on timing, we may always only write 1 byte.
+     */
+    if (m_sobuf) {
+      while (!call Registers.getIfgTx()); /* in case interleaved UB.send */
+      while (m_slen && call Registers.getIfgTx()) {
+	call Registers.setTxbuf(*m_sbuf);
+	if (--m_slen)
+	  m_sbuf++;
+      }
+      if (m_slen == 0) {
+	call Registers.clrIeTx();
+	m_sobuf = 0;
+	signal UartStream.sendDone(m_sobuf, m_solen, SUCCESS);
+      }
     }
   }
 
-  async command error_t enableReceiveInterrupt()
+  async command error_t UartStream.enableReceiveInterrupt()
   {
-    if (!robuf)
-      call Registers.clrIfgRx();
-    call Registers.setIeRx();
-    rxie = FALSE;
-    return SUCCESS;
+    atomic {
+      if (!m_robuf)
+	call Registers.clrIfgRx();
+      call Registers.setIeRx();
+      m_rxie = FALSE;
+      return SUCCESS;
+    }
   }
 
-  async command error_t disableReceiveInterrupt()
+  async command error_t UartStream.disableReceiveInterrupt()
   {
-    if (!robuf) {
-      call Registers.clrIeRx();
-      call Registers.clrIfgRx();
-    } else
-      rxie = TRUE;
-    return SUCCESS;
+    atomic {
+      if (!m_robuf) {
+	call Registers.clrIeRx();
+	call Registers.clrIfgRx();
+      } else
+	m_rxie = TRUE;
+      return SUCCESS;
+    }
   }
 
-  async command error_t receive(uint8_t* buf, uint16_t len)
+  async command error_t UartByte.receive(uint8_t* byte, uint8_t timeout)
   {
-    if (robuf || !buf || !len)
+    atomic {
+      uint16_t t;
+
+      /* FIXME: race with UartStream.receive() */
+      if (m_robuf || !byte)
+	return FAIL;
+      /* TODO: implement timeout, byte-time units.  For now, 1-2 sec */
+      t = TBR;
+      while (t < TBR) {
+	if (call Registers.getIfgRx()) {
+	  *byte = call Registers.getRxbuf();
+	  return SUCCESS;
+	}
+      }
       return FAIL;
-    robuf = rbuf = buf;
-    rolen = rlen = len;
-    if (!call Registers.getIeRx) {
-      call Registers.clrIfgRx();
-      call Registers.setIeRx();
-      rxie = TRUE;
-    } else
-      rxie = FALSE;
+    }
+  }
+
+  async command error_t UartStream.receive(uint8_t* buf, uint16_t len)
+  {
+    atomic {
+      if (m_robuf || !buf || !len)
+	return FAIL;
+      m_robuf = m_rbuf = buf;
+      m_rolen = m_rlen = len;
+      if (!call Registers.getIeRx()) {
+	call Registers.clrIfgRx();
+	call Registers.setIeRx();
+	m_rxie = TRUE;
+      } else
+	m_rxie = FALSE;
+    }
   }
 
   async event void Interrupts.rx(uint8_t byte)
   {
-    if (robuf) {
+    if (m_robuf) {
       /* receive() takes precedence if active */
-      while (rlen && call Registers.getIfgRx()) {
-	*rbuf = byte;
-	if (--rlen)
-	  rbuf++;
+      /* FIXME: an arbitrarily long ISR may occur if m_rlen is large.
+       * But depending on timing, we may always only read 1 byte.
+       */
+      while (m_rlen && call Registers.getIfgRx()) {
+	*m_rbuf = byte;
+	if (--m_rlen)
+	  m_rbuf++;
       }
-      if (rlen == 0 && robuf) {
-	if (rxie) {
+      if (m_rlen == 0 && m_robuf) {
+	if (m_rxie) {
 	  call Registers.clrIeRx();
 	  call Registers.clrIfgRx();
 	}
-	robuf = 0;
-	signal UartStream.receiveDone(robuf, rolen, SUCCESS);
+	m_robuf = 0;
+	signal UartStream.receiveDone(m_robuf, m_rolen, SUCCESS);
       }
     } else
       signal UartStream.receivedByte(byte);
   }
+
+  default async command const msp430_usci_uart_t* Configure.get()
+  {
+    const static msp430_usci_uart_t def = {
+      ctl0: UCMODE_0,		/* async, lsb first, 8N1 */
+      ctl1: UCSWRST | UCSSEL_3,	/* clock uart from SMCLK */
+      brx: UBRX_1MHZ_115200,
+      mctl: UMCTL_1MHZ_115200,
+      irtctl: 0,
+      irrctl: 0,
+      abctl: 0,
+      uclisten: FALSE,
+      ren: USCI_REN_NONE
+    };
+
+    return &def;
+  }
+
+  async event void Interrupts.i2cStart() {}
+  async event void Interrupts.i2cStop() {}
+  async event void Interrupts.i2cCal() {}
+  async event void Interrupts.brk() {}
+  async event void Interrupts.i2cNack() {}
+  async event void Counter.overflow() {}
+
+  default async event void UartStream.sendDone( uint8_t* buf, uint16_t len,
+      error_t error ) {}
+  default async event void UartStream.receivedByte( uint8_t byte ) {}
+  default async event void UartStream.receiveDone( uint8_t* buf, uint16_t len,
+      error_t error ) {}
 }