Oops - wrong casting on the Configuration Descriptor pointer advance routine.

[pub/USBasp.git] / Projects / AVRISP / Lib / PDITarget.c

diff --git a/Projects/AVRISP/Lib/PDITarget.c b/Projects/AVRISP/Lib/PDITarget.c
index 7b35a33..7fa48e6 100644 (file)
--- a/Projects/AVRISP/Lib/PDITarget.c
+++ b/Projects/AVRISP/Lib/PDITarget.c
@@ -38,88 +38,277 @@
 #define  INCLUDE_FROM_PDITARGET_C\r
 #include "PDITarget.h"\r
 \r
 #define  INCLUDE_FROM_PDITARGET_C\r
 #include "PDITarget.h"\r
 \r

-/** Writes a given byte to the attached XMEGA device, using a RS232 frame via software through the\r
- *  PDI interface.\r
- *\r
- *  \param[in] Byte  Byte to send to the attached device\r
- */\r
-void PDITarget_SendByte(uint8_t Byte)\r
+volatile bool     IsSending;\r
+\r
+#if !defined(PDI_VIA_HARDWARE_USART)\r
+volatile uint16_t SoftUSART_Data;\r
+volatile uint8_t  SoftUSART_BitCount;\r
+\r
+ISR(TIMER0_COMPA_vect, ISR_BLOCK)\r

 {\r
 {\r

-       uint8_t LogicOneBits = 0;\r
+       /* Toggle CLOCK pin in a single cycle (see AVR datasheet) */\r
+       BITBANG_PDICLOCK_PIN |= BITBANG_PDICLOCK_MASK;\r

 \r
 \r

-       // One Start Bit\r
-       PDIDATA_LINE_PORT &= ~PDIDATA_LINE_MASK;\r
+       /* If not sending or receiving, just exit */\r
+       if (!(SoftUSART_BitCount))\r
+         return;\r

 \r
 \r

-       TOGGLE_PDI_CLOCK;\r
-       \r
-       // Eight Data Bits\r
-       for (uint8_t i = 0; i < 8; i++)\r
+       /* Check to see if the current clock state is on the rising or falling edge */\r
+       bool IsRisingEdge = (BITBANG_PDICLOCK_PORT & BITBANG_PDICLOCK_MASK);\r
+\r
+       if (IsSending && !IsRisingEdge)\r

        {\r
        {\r

-               if (Byte & 0x01)\r
-               {\r
-                       PDIDATA_LINE_PORT &= ~PDIDATA_LINE_MASK;\r
-                       LogicOneBits++;\r
-               }\r
+               if (SoftUSART_Data & 0x01)\r
+                 BITBANG_PDIDATA_PORT |=  BITBANG_PDIDATA_MASK;\r

                else\r
                else\r

-               {\r
-                       PDIDATA_LINE_PORT |=  PDIDATA_LINE_MASK;\r
-               }\r
-               \r
-               Byte >>= 1;\r
+                 BITBANG_PDIDATA_PORT &= ~BITBANG_PDIDATA_MASK;                  \r

 \r
 \r

-               TOGGLE_PDI_CLOCK;\r
+               SoftUSART_Data >>= 1;\r
+               SoftUSART_BitCount--;\r

        }\r
        }\r

+       else if (!IsSending && IsRisingEdge)\r
+       {\r
+               /* Wait for the start bit when receiving */\r
+               if ((SoftUSART_BitCount == BITS_IN_FRAME) && (BITBANG_PDIDATA_PIN & BITBANG_PDIDATA_MASK))\r
+                 return;\r
+       \r
+               if (BITBANG_PDIDATA_PIN & BITBANG_PDIDATA_MASK)\r
+                 SoftUSART_Data |= (1 << BITS_IN_FRAME);\r

 \r
 \r

-       // Even Parity Bit\r
-       if (LogicOneBits & 0x01)\r
-         PDIDATA_LINE_PORT &= ~PDIDATA_LINE_MASK;\r
-       else\r
-         PDIDATA_LINE_PORT |=  PDIDATA_LINE_MASK;\r
+               SoftUSART_Data >>= 1;\r
+               SoftUSART_BitCount--;\r
+       }\r
+}\r
+#endif\r
+\r
+void PDITarget_EnableTargetPDI(void)\r
+{\r
+#if defined(PDI_VIA_HARDWARE_USART)\r
+       /* Set Tx and XCK as outputs, Rx as input */\r
+       DDRD |=  (1 << 5) | (1 << 3);\r
+       DDRD &= ~(1 << 2);\r
+       \r
+       /* Set DATA line high for at least 90ns to disable /RESET functionality */\r
+       PORTD |= (1 << 3);\r
+       asm volatile ("NOP"::);\r
+       asm volatile ("NOP"::);\r
+       \r
+       /* Set up the synchronous USART for XMEGA communications - \r
+          8 data bits, even parity, 2 stop bits */\r
+       UBRR1  = 10;\r
+       UCSR1B = (1 << TXEN1);\r
+       UCSR1C = (1 << UMSEL10) | (1 << UPM11) | (1 << USBS1) | (1 << UCSZ11) | (1 << UCSZ10) | (1 << UCPOL1);\r

 \r
 \r

-       TOGGLE_PDI_CLOCK;\r
+       /* Send two BREAKs of 12 bits each to enable PDI interface (need at least 16 idle bits) */\r
+       PDITarget_SendBreak();\r
+       PDITarget_SendBreak();\r
+#else\r
+       /* Set DATA and CLOCK lines to outputs */\r
+       BITBANG_PDIDATA_DDR  |= BITBANG_PDIDATA_MASK;\r
+       BITBANG_PDICLOCK_DDR |= BITBANG_PDICLOCK_MASK;\r
+       \r
+       /* Set DATA line high for at least 90ns to disable /RESET functionality */\r
+       BITBANG_PDIDATA_PORT |= BITBANG_PDIDATA_MASK;\r
+       asm volatile ("NOP"::);\r
+       asm volatile ("NOP"::);\r

 \r
 \r

-       // Two Stop Bits\r
-       PDIDATA_LINE_PORT |= PDIDATA_LINE_MASK;\r
+       /* Fire timer compare ISR every 50 cycles to manage the software USART */\r
+       OCR0A   = 50;\r
+       TCCR0A  = (1 << WGM01);\r
+       TCCR0B  = (1 << CS00);\r
+       TIMSK0  = (1 << OCIE0A);\r

        \r
        \r

-       TOGGLE_PDI_CLOCK;\r
-       TOGGLE_PDI_CLOCK;\r
+       PDITarget_SendBreak();\r
+       PDITarget_SendBreak();\r
+#endif\r

 }\r
 \r
 }\r
 \r

-/** Reads a given byte from the attached XMEGA device, encoded in a RS232 frame through the PDI interface.\r
- *\r
- *  \return Received byte from the attached device\r
- */\r
-uint8_t PDITarget_ReceiveByte(void)\r
+void PDITarget_DisableTargetPDI(void)\r

 {\r
 {\r

-       uint8_t ReceivedByte = 0;\r
+#if defined(PDI_VIA_HARDWARE_USART)\r
+       /* Turn off receiver and transmitter of the USART, clear settings */\r
+       UCSR1A |= (1 << TXC1) | (1 << RXC1);\r
+       UCSR1B  = 0;\r
+       UCSR1C  = 0;\r
+\r
+       /* Set all USART lines as input, tristate */\r
+       DDRD  &= ~((1 << 5) | (1 << 3));\r
+       PORTD &= ~((1 << 5) | (1 << 3) | (1 << 2));\r
+#else\r
+       /* Set DATA and CLOCK lines to inputs */\r
+       BITBANG_PDIDATA_DDR   &= ~BITBANG_PDIDATA_MASK;\r
+       BITBANG_PDICLOCK_DDR  &= ~BITBANG_PDICLOCK_MASK;\r
+       \r
+       /* Tristate DATA and CLOCK lines */\r
+       BITBANG_PDIDATA_PORT  &= ~BITBANG_PDIDATA_MASK;\r
+       BITBANG_PDICLOCK_PORT &= ~BITBANG_PDICLOCK_MASK;\r

 \r
 \r

-       PDIDATA_LINE_DDR &= ~PDIDATA_LINE_MASK;\r
+       TCCR0B  = 0;\r
+#endif\r
+}\r

 \r
 \r

-       // One Start Bit\r
-       while (PDIDATA_LINE_PIN & PDIDATA_LINE_MASK);\r
-         TOGGLE_PDI_CLOCK;\r
+void PDITarget_SendByte(uint8_t Byte)\r
+{\r
+#if defined(PDI_VIA_HARDWARE_USART)\r
+       /* Switch to Tx mode if currently in Rx mode */\r
+       if (!(IsSending))\r
+       {\r
+               PORTD  |=  (1 << 3);\r
+               DDRD   |=  (1 << 3);\r
+\r
+               UCSR1B &= ~(1 << RXEN1);\r
+               UCSR1B |=  (1 << TXEN1);\r

                \r
                \r

-       // Eight Data Bits\r
+               IsSending = true;\r
+       }\r
+       \r
+       /* Wait until there is space in the hardware Tx buffer before writing */\r
+       while (!(UCSR1A & (1 << UDRE1)));\r
+       UDR1 = Byte;\r
+#else\r
+       /* Switch to Tx mode if currently in Rx mode */\r
+       if (!(IsSending))\r
+       {\r
+               BITBANG_PDIDATA_PORT |= BITBANG_PDIDATA_MASK;\r
+               BITBANG_PDIDATA_DDR  |= BITBANG_PDIDATA_MASK;\r
+\r
+               IsSending = true;\r
+       }\r
+\r
+       bool    EvenParityBit = false;\r
+       uint8_t ParityData    = Byte;\r
+\r
+       /* Compute Even parity bit */\r

        for (uint8_t i = 0; i < 8; i++)\r
        {\r
        for (uint8_t i = 0; i < 8; i++)\r
        {\r

-               if (PDIDATA_LINE_PIN & PDIDATA_LINE_MASK)\r
-                       ReceivedByte |= 0x01;\r
+               EvenParityBit ^= ParityData & 0x01;\r
+               ParityData    >>= 1;\r
+       }\r
+\r
+       while (SoftUSART_BitCount);\r
+\r
+       /* Data shifted out LSB first, START DATA PARITY STOP STOP */\r
+       SoftUSART_Data     = ((uint16_t)EvenParityBit << 9) | ((uint16_t)Byte << 1) | (1 << 10) | (1 << 11);\r
+       SoftUSART_BitCount = BITS_IN_FRAME;\r
+#endif\r
+}\r
+\r
+uint8_t PDITarget_ReceiveByte(void)\r
+{\r
+#if defined(PDI_VIA_HARDWARE_USART)\r
+       /* Switch to Rx mode if currently in Tx mode */\r
+       if (IsSending)\r
+       {\r
+               while (!(UCSR1A & (1 << TXC1)));\r
+               UCSR1A |=  (1 << TXC1);\r
+\r
+               UCSR1B &= ~(1 << TXEN1);\r
+               UCSR1B |=  (1 << RXEN1);\r
+\r
+               DDRD   &= ~(1 << 3);\r
+               PORTD  &= ~(1 << 3);\r
+               \r
+               IsSending = false;\r
+       }\r
+\r
+       /* Wait until a byte has been received before reading */\r
+       while (!(UCSR1A & (1 << RXC1)));\r
+       return UDR1;\r
+#else\r
+       /* Switch to Rx mode if currently in Tx mode */\r
+       if (IsSending)\r
+       {\r
+               while (SoftUSART_BitCount);\r

 \r
 \r

-               ReceivedByte <<= 1;\r
+               BITBANG_PDIDATA_DDR  &= ~BITBANG_PDIDATA_MASK;\r
+               BITBANG_PDIDATA_PORT &= ~BITBANG_PDIDATA_MASK;\r

 \r
 \r

-               TOGGLE_PDI_CLOCK;       \r
+               IsSending = false;\r
+       }\r
+\r
+       /* Wait until a byte has been received before reading */\r
+       SoftUSART_BitCount = BITS_IN_FRAME;\r
+       while (SoftUSART_BitCount);\r
+       \r
+       /* Throw away the start, parity and stop bits to leave only the data */\r
+       return (uint8_t)(SoftUSART_Data >> 1);\r
+#endif\r
+}\r
+\r
+void PDITarget_SendBreak(void)\r
+{\r
+#if defined(PDI_VIA_HARDWARE_USART)\r
+       /* Switch to Tx mode if currently in Rx mode */\r
+       if (!(IsSending))\r
+       {\r
+               PORTD  |=  (1 << 3);\r
+               DDRD   |=  (1 << 3);\r
+\r
+               UCSR1B &= ~(1 << RXEN1);\r
+               UCSR1B |=  (1 << TXEN1);\r
+               \r
+               IsSending = true;\r

        }\r
 \r
        }\r
 \r

-       // Even Parity Bit (discarded)\r
-       TOGGLE_PDI_CLOCK;\r
+       /* Need to do nothing for a full frame to send a BREAK */\r
+       for (uint8_t i = 0; i <= BITS_IN_FRAME; i++)\r
+       {\r
+               /* Wait for a full cycle of the clock */\r
+               while (PIND & (1 << 5));\r
+               while (!(PIND & (1 << 5)));\r
+       }\r
+#else\r
+       /* Switch to Tx mode if currently in Rx mode */\r
+       if (!(IsSending))\r
+       {\r
+               BITBANG_PDIDATA_PORT |= BITBANG_PDIDATA_MASK;\r
+               BITBANG_PDIDATA_DDR  |= BITBANG_PDIDATA_MASK;\r

 \r
 \r

-       // Two Stop Bits\r
-       TOGGLE_PDI_CLOCK;\r
-       TOGGLE_PDI_CLOCK;\r
+               IsSending = true;\r
+       }\r

        \r
        \r

-       PDIDATA_LINE_DDR |= PDIDATA_LINE_MASK;\r
+       while (SoftUSART_BitCount);\r
+\r
+       /* Need to do nothing for a full frame to send a BREAK */\r
+       SoftUSART_Data     = 0x0FFF;\r
+       SoftUSART_BitCount = BITS_IN_FRAME;\r
+#endif\r
+}\r
+\r
+void PDITarget_SendAddress(uint32_t Address)\r
+{\r
+       PDITarget_SendByte(Address >> 24);\r
+       PDITarget_SendByte(Address >> 26);\r
+       PDITarget_SendByte(Address >> 8);\r
+       PDITarget_SendByte(Address &  0xFF);\r
+}\r
+\r
+bool PDITarget_WaitWhileNVMBusBusy(void)\r
+{\r
+       uint8_t AttemptsRemaining = 255;\r
+\r
+       /* Poll the STATUS register to check to see if NVM access has been enabled */\r
+       while (AttemptsRemaining--)\r
+       {\r
+               PDITarget_SendByte(PDI_CMD_LDCS | PDI_STATUS_REG);\r
+               if (PDITarget_ReceiveByte() & PDI_STATUS_NVM)\r
+                 return true;\r
+       }\r

        \r
        \r

-       return ReceivedByte;\r
+       return false;\r
+}\r
+\r
+void PDITarget_WaitWhileNVMControllerBusy(void)\r
+{\r
+       /* Poll the NVM STATUS register to check to see if NVM controller is busy */\r
+       for (;;)\r
+       {\r
+               PDITarget_SendByte(PDI_CMD_LDS | (PDI_DATSIZE_1BYTE << 2));\r
+               PDITarget_SendAddress(DATAMEM_BASE | DATAMEM_NVM_STATUS);\r
+               \r
+               if (!(PDITarget_ReceiveByte() & (1 << 7)))\r
+                 return;\r
+       }\r

 }\r
 \r
 #endif\r
 }\r
 \r
 #endif\r