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/* Copyright (C) 2014 by Jacob Alexander |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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* THE SOFTWARE. |
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*/ |
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// ----- Includes ----- |
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// Compiler Includes |
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#include <Lib/ScanLib.h> |
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// Project Includes |
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#include <cli.h> |
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#include <led.h> |
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#include <print.h> |
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#include <matrix_scan.h> |
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// Local Includes |
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#include "scan_loop.h" |
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#include "macro.h" |
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typedef struct I2C_Buffer { |
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volatile uint16_t head; |
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volatile uint16_t tail; |
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volatile uint8_t sequencePos; |
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volatile uint16_t size; |
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volatile uint8_t *buffer; |
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} I2C_Buffer; |
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// ----- Function Declarations ----- |
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// CLI Functions |
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void cliFunc_echo( char* args ); |
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void cliFunc_i2cRecv( char* args ); |
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void cliFunc_i2cSend( char* args ); |
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void cliFunc_ledZero( char* args ); |
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uint8_t I2C_TxBufferPop(); |
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void I2C_BufferPush( uint8_t byte, I2C_Buffer *buffer ); |
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uint16_t I2C_BufferLen( I2C_Buffer *buffer ); |
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// ----- Variables ----- |
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// Scan Module command dictionary |
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CLIDict_Entry( echo, "Example command, echos the arguments." ); |
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CLIDict_Entry( i2cRecv, "Send I2C sequence of bytes and expect a reply of 1 byte." ); |
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CLIDict_Entry( i2cSend, "Send I2C sequence of bytes." ); |
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CLIDict_Entry( ledZero, "Zero out LED register pages (non-configuration)." ); |
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CLIDict_Def( scanCLIDict, "Scan Module Commands" ) = { |
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CLIDict_Item( echo ), |
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CLIDict_Item( i2cRecv ), |
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CLIDict_Item( i2cSend ), |
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CLIDict_Item( ledZero ), |
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{ 0, 0, 0 } // Null entry for dictionary end |
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}; |
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// Number of scans since the last USB send |
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uint16_t Scan_scanCount = 0; |
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// Before sending the sequence, I2C_TxBuffer_CurLen is assigned and as each byte is sent, it is decremented |
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// Once I2C_TxBuffer_CurLen reaches zero, a STOP on the I2C bus is sent |
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#define I2C_TxBufferLength 300 |
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#define I2C_RxBufferLength 8 |
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volatile uint8_t I2C_TxBufferPtr[ I2C_TxBufferLength ]; |
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volatile uint8_t I2C_RxBufferPtr[ I2C_TxBufferLength ]; |
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volatile I2C_Buffer I2C_TxBuffer = { 0, 0, 0, I2C_TxBufferLength, I2C_TxBufferPtr }; |
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volatile I2C_Buffer I2C_RxBuffer = { 0, 0, 0, I2C_RxBufferLength, I2C_RxBufferPtr }; |
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void I2C_setup() |
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{ |
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// Enable I2C internal clock |
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SIM_SCGC4 |= SIM_SCGC4_I2C0; // Bus 0 |
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// External pull-up resistor |
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PORTB_PCR0 = PORT_PCR_ODE | PORT_PCR_SRE | PORT_PCR_DSE | PORT_PCR_MUX(2); |
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PORTB_PCR1 = PORT_PCR_ODE | PORT_PCR_SRE | PORT_PCR_DSE | PORT_PCR_MUX(2); |
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// SCL Frequency Divider |
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// 400kHz -> 120 (0x85) @ 48 MHz F_BUS |
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I2C0_F = 0x85; |
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I2C0_FLT = 4; |
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I2C0_C1 = I2C_C1_IICEN; |
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I2C0_C2 = I2C_C2_HDRS; // High drive select |
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// Enable I2C Interrupt |
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NVIC_ENABLE_IRQ( IRQ_I2C0 ); |
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} |
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// ----- Interrupt Functions ----- |
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void i2c0_isr() |
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{ |
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cli(); // Disable Interrupts |
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uint8_t status = I2C0_S; // Read I2C Bus status |
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// Master Mode Transmit |
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if ( I2C0_C1 & I2C_C1_TX ) |
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{ |
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// Check current use of the I2C bus |
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// Currently sending data |
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if ( I2C_TxBuffer.sequencePos > 0 ) |
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{ |
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// Make sure slave sent an ACK |
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if ( status & I2C_S_RXAK ) |
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{ |
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// NACK Detected, disable interrupt |
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erro_print("I2C NAK detected..."); |
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I2C0_C1 = I2C_C1_IICEN; |
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// Abort Tx Buffer |
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I2C_TxBuffer.head = 0; |
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I2C_TxBuffer.tail = 0; |
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I2C_TxBuffer.sequencePos = 0; |
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} |
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else |
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{ |
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// Transmit byte |
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I2C0_D = I2C_TxBufferPop(); |
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} |
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} |
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// Receiving data |
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else if ( I2C_RxBuffer.sequencePos > 0 ) |
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{ |
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// Master Receive, addr sent |
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if ( status & I2C_S_ARBL ) |
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{ |
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// Arbitration Lost |
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erro_print("Arbitration lost..."); |
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// TODO Abort Rx |
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I2C0_C1 = I2C_C1_IICEN; |
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I2C0_S = I2C_S_ARBL | I2C_S_IICIF; // Clear ARBL flag and interrupt |
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} |
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if ( status & I2C_S_RXAK ) |
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{ |
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// Slave Address NACK Detected, disable interrupt |
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erro_print("Slave Address I2C NAK detected..."); |
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// TODO Abort Rx |
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I2C0_C1 = I2C_C1_IICEN; |
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} |
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else |
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{ |
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I2C0_C1 = I2C_RxBuffer.sequencePos == 1 |
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? I2C_C1_IICEN | I2C_C1_IICIE | I2C_C1_MST | I2C_C1_TXAK // Single byte read |
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: I2C_C1_IICEN | I2C_C1_IICIE | I2C_C1_MST; // Multi-byte read |
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} |
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} |
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else |
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{ |
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dbug_msg("STOP - "); |
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printHex( I2C_BufferLen( (I2C_Buffer*)&I2C_TxBuffer ) ); |
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print(NL); |
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// If there is another sequence, start sending |
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if ( I2C_BufferLen( (I2C_Buffer*)&I2C_TxBuffer ) < I2C_TxBuffer.size ) |
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{ |
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// Check to see if we already have control of the bus |
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if ( I2C0_C1 & I2C_C1_MST ) |
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{ |
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// Already the master (ah yeah), send a repeated start |
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I2C0_C1 = I2C_C1_IICEN | I2C_C1_MST | I2C_C1_RSTA | I2C_C1_TX; |
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} |
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// Otherwise, seize control |
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else |
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{ |
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// Wait...till the master dies |
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while ( I2C0_S & I2C_S_BUSY ); |
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// Now we're the master (ah yisss), get ready to send stuffs |
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I2C0_C1 = I2C_C1_IICEN | I2C_C1_MST | I2C_C1_TX; |
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} |
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// Enable I2C interrupt |
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I2C0_C1 = I2C_C1_IICEN | I2C_C1_IICIE | I2C_C1_MST | I2C_C1_TX; |
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// Transmit byte |
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I2C0_D = I2C_TxBufferPop(); |
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} |
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// Issue STOP |
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else |
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{ |
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delayMicroseconds( 1 ); // Should be enough time before issuing STOP |
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I2C0_C1 = I2C_C1_IICEN; // Send STOP |
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} |
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} |
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} |
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// Master Mode Receive |
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else |
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{ |
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// XXX Do we need to handle 2nd last byte? |
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//I2C0_C1 = I2C_C1_IICEN | I2C_C1_IICIE | I2C_C1_MST | I2C_C1_TXAK; // No STOP, Rx, NAK on recv |
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// Last byte |
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if ( I2C_TxBuffer.sequencePos <= 1 ) |
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{ |
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// Change to Tx mode |
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I2C0_C1 = I2C_C1_IICEN | I2C_C1_MST | I2C_C1_TX; |
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// Grab last byte |
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I2C_BufferPush( I2C0_D, (I2C_Buffer*)&I2C_RxBuffer ); |
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delayMicroseconds( 1 ); // Should be enough time before issuing the stop |
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I2C0_C1 = I2C_C1_IICEN; // Send STOP |
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} |
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else |
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{ |
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// Retrieve data |
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I2C_BufferPush( I2C0_D, (I2C_Buffer*)&I2C_RxBuffer ); |
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} |
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} |
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I2C0_S = I2C_S_IICIF; // Clear interrupt |
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sei(); // Re-enable Interrupts |
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} |
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// ----- Functions ----- |
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// Setup |
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inline void LED_setup() |
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{ |
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I2C_setup(); |
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} |
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inline uint8_t I2C_BufferCopy( uint8_t *data, uint8_t sendLen, uint8_t recvLen, I2C_Buffer *buffer ) |
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{ |
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uint8_t reTurn = 0; |
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// If sendLen is greater than buffer fail right away |
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if ( sendLen > buffer->size ) |
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return 0; |
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// Calculate new tail to determine if buffer has enough space |
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// The first element specifies the expected number of bytes from the slave (+1) |
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// The second element in the new buffer is the length of the buffer sequence (+1) |
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uint16_t newTail = buffer->tail + sendLen + 2; |
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if ( newTail >= buffer->size ) |
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newTail -= buffer->size; |
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if ( I2C_BufferLen( buffer ) < sendLen + 2 ) |
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return 0; |
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/* |
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print("|"); |
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printHex( sendLen + 2 ); |
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print("|"); |
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printHex( *tail ); |
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print("@"); |
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printHex( newTail ); |
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print("@"); |
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*/ |
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// If buffer is clean, return 1, otherwise 2 |
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reTurn = buffer->head == buffer->tail ? 1 : 2; |
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// Add to buffer, already know there is enough room (simplifies adding logic) |
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uint8_t bufferHeaderPos = 0; |
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for ( uint16_t c = 0; c < sendLen; c++ ) |
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{ |
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// Add data to buffer |
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switch ( bufferHeaderPos ) |
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{ |
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case 0: |
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buffer->buffer[ buffer->tail ] = recvLen; |
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bufferHeaderPos++; |
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c--; |
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break; |
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case 1: |
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buffer->buffer[ buffer->tail ] = sendLen; |
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bufferHeaderPos++; |
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c--; |
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break; |
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default: |
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buffer->buffer[ buffer->tail ] = data[ c ]; |
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break; |
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} |
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// Check for wrap-around case |
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if ( buffer->tail + 1 >= buffer->size ) |
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{ |
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buffer->tail = 0; |
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} |
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// Normal case |
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else |
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{ |
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buffer->tail++; |
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} |
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} |
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return reTurn; |
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} |
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inline uint16_t I2C_BufferLen( I2C_Buffer *buffer ) |
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{ |
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// Tail >= Head |
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if ( buffer->tail >= buffer->head ) |
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return buffer->head + buffer->size - buffer->tail; |
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// Head > Tail |
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return buffer->head - buffer->tail; |
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} |
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void I2C_BufferPush( uint8_t byte, I2C_Buffer *buffer ) |
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{ |
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// Make sure buffer isn't full |
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if ( buffer->tail + 1 == buffer->head || ( buffer->head > buffer->tail && buffer->tail + 1 - buffer->size == buffer->head ) ) |
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{ |
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warn_msg("I2C_BufferPush failed, buffer full: "); |
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printHex( byte ); |
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print( NL ); |
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return; |
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} |
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// Check for wrap-around case |
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if ( buffer->tail + 1 >= buffer->size ) |
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{ |
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buffer->tail = 0; |
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} |
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// Normal case |
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else |
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{ |
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buffer->tail++; |
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} |
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// Add byte to buffer |
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buffer->buffer[ buffer->tail ] = byte; |
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} |
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uint8_t I2C_TxBufferPop() |
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{ |
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// Return 0xFF if no buffer left (do not rely on this) |
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if ( I2C_BufferLen( (I2C_Buffer*)&I2C_TxBuffer ) >= I2C_TxBuffer.size ) |
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{ |
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erro_msg("No buffer to pop an entry from... "); |
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printHex( I2C_TxBuffer.head ); |
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print(" "); |
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printHex( I2C_TxBuffer.tail ); |
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print(" "); |
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printHex( I2C_TxBuffer.sequencePos ); |
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print(NL); |
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return 0xFF; |
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} |
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// If there is currently no sequence being sent, the first entry in the RingBuffer is the length |
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if ( I2C_TxBuffer.sequencePos == 0 ) |
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{ |
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I2C_TxBuffer.sequencePos = 0xFF; // So this doesn't become an infinite loop |
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I2C_RxBuffer.sequencePos = I2C_TxBufferPop(); |
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I2C_TxBuffer.sequencePos = I2C_TxBufferPop(); |
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} |
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uint8_t data = I2C_TxBuffer.buffer[ I2C_TxBuffer.head ]; |
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// Prune head |
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I2C_TxBuffer.head++; |
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// Wrap-around case |
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if ( I2C_TxBuffer.head >= I2C_TxBuffer.size ) |
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I2C_TxBuffer.head = 0; |
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// Decrement buffer sequence (until next stop will be sent) |
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I2C_TxBuffer.sequencePos--; |
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dbug_msg("Popping: "); |
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printHex( data ); |
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print(" "); |
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printHex( I2C_TxBuffer.head ); |
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print(" "); |
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printHex( I2C_TxBuffer.tail ); |
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print(" "); |
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printHex( I2C_TxBuffer.sequencePos ); |
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print(NL); |
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return data; |
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} |
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uint8_t I2C_Send( uint8_t *data, uint8_t sendLen, uint8_t recvLen ) |
|
|
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{ |
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// Check head and tail pointers |
|
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// If full, return 0 |
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// If empty, start up I2C Master Tx |
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// If buffer is non-empty and non-full, just append to the buffer |
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switch ( I2C_BufferCopy( data, sendLen, recvLen, (I2C_Buffer*)&I2C_TxBuffer ) ) |
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{ |
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// Not enough buffer space... |
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case 0: |
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/* |
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erro_msg("Not enough Tx buffer space... "); |
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printHex( I2C_TxBuffer.head ); |
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print(":"); |
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printHex( I2C_TxBuffer.tail ); |
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print("+"); |
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printHex( sendLen ); |
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print("|"); |
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printHex( I2C_TxBuffer.size ); |
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print( NL ); |
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*/ |
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return 0; |
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|
// Empty buffer, initialize I2C |
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case 1: |
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// Clear status flags |
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I2C0_S = I2C_S_IICIF | I2C_S_ARBL; |
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// Check to see if we already have control of the bus |
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if ( I2C0_C1 & I2C_C1_MST ) |
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{ |
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|
// Already the master (ah yeah), send a repeated start |
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I2C0_C1 = I2C_C1_IICEN | I2C_C1_MST | I2C_C1_RSTA | I2C_C1_TX; |
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} |
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// Otherwise, seize control |
|
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else |
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{ |
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// Wait...till the master dies |
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while ( I2C0_S & I2C_S_BUSY ); |
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// Now we're the master (ah yisss), get ready to send stuffs |
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I2C0_C1 = I2C_C1_IICEN | I2C_C1_MST | I2C_C1_TX; |
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} |
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|
// Enable I2C interrupt |
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I2C0_C1 = I2C_C1_IICEN | I2C_C1_IICIE | I2C_C1_MST | I2C_C1_TX; |
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|
// Depending on what type of transfer, the first byte is configured for R or W |
|
|
|
I2C0_D = I2C_TxBufferPop(); |
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|
return 1; |
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|
} |
|
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|
|
// Dirty buffer, I2C already initialized |
|
|
|
return 2; |
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|
|
} |
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|
void LED_zeroPages( uint8_t startPage, uint8_t numPages, uint8_t pageLen ) |
|
|
|
{ |
|
|
|
// Page Setup |
|
|
|
uint8_t pageSetup[] = { 0xE8, 0xFD, 0x00 }; |
|
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|
|
|
|
// Max length of a page + chip id + reg start |
|
|
|
uint8_t fullPage[ 0xB3 + 2 ] = { 0 }; |
|
|
|
fullPage[0] = 0xE8; // Set chip id, starting reg is already 0x00 |
|
|
|
|
|
|
|
// Iterate through given pages, zero'ing out the given register regions |
|
|
|
for ( uint8_t page = startPage; page < startPage + numPages; page++ ) |
|
|
|
{ |
|
|
|
// Set page |
|
|
|
pageSetup[2] = page; |
|
|
|
|
|
|
|
// Setup page |
|
|
|
while ( I2C_Send( pageSetup, sizeof( pageSetup ), 0 ) == 0 ) |
|
|
|
delay(1); |
|
|
|
|
|
|
|
// Zero out page |
|
|
|
while ( I2C_Send( fullPage, pageLen + 2, 0 ) == 0 ) |
|
|
|
delay(1); |
|
|
|
} |
|
|
|
} |
|
|
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|
|
|
|
|
|
|
|
|
|
|
|
// LED State processing loop |
|
|
|
inline uint8_t LED_loop() |
|
|
|
{ |
|
|
|
|
|
|
|
// I2C Busy |
|
|
|
// S & I2C_S_BUSY |
|
|
|
//I2C_S_BUSY |
|
|
|
} |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
// Setup |
|
|
|
inline void Scan_setup() |
|
|
|
{ |
|
|
|
// Register Scan CLI dictionary |
|
|
|
CLI_registerDictionary( scanCLIDict, scanCLIDictName ); |
|
|
|
|
|
|
|
// Setup GPIO pins for matrix scanning |
|
|
|
//Matrix_setup(); |
|
|
|
|
|
|
|
// Reset scan count |
|
|
|
Scan_scanCount = 0; |
|
|
|
|
|
|
|
// Setup LED Drivers |
|
|
|
LED_setup(); |
|
|
|
} |
|
|
|
|
|
|
|
|
|
|
|
// Main Detection Loop |
|
|
|
inline uint8_t Scan_loop() |
|
|
|
{ |
|
|
|
//Matrix_scan( Scan_scanCount++ ); |
|
|
|
//LED_scan(); |
|
|
|
|
|
|
|
return 0; |
|
|
|
} |
|
|
|
|
|
|
|
|
|
|
|
// Signal from Macro Module that all keys have been processed (that it knows about) |
|
|
|
inline void Scan_finishedWithMacro( uint8_t sentKeys ) |
|
|
|
{ |
|
|
|
} |
|
|
|
|
|
|
|
|
|
|
|
// Signal from Output Module that all keys have been processed (that it knows about) |
|
|
|
inline void Scan_finishedWithOutput( uint8_t sentKeys ) |
|
|
|
{ |
|
|
|
// Reset scan loop indicator (resets each key debounce state) |
|
|
|
// TODO should this occur after USB send or Macro processing? |
|
|
|
Scan_scanCount = 0; |
|
|
|
} |
|
|
|
|
|
|
|
|
|
|
|
// ----- CLI Command Functions ----- |
|
|
|
|
|
|
|
// XXX Just an example command showing how to parse arguments (more complex than generally needed) |
|
|
|
void cliFunc_echo( char* args ) |
|
|
|
{ |
|
|
|
char* curArgs; |
|
|
|
char* arg1Ptr; |
|
|
|
char* arg2Ptr = args; |
|
|
|
|
|
|
|
// Parse args until a \0 is found |
|
|
|
while ( 1 ) |
|
|
|
{ |
|
|
|
print( NL ); // No \r\n by default after the command is entered |
|
|
|
|
|
|
|
curArgs = arg2Ptr; // Use the previous 2nd arg pointer to separate the next arg from the list |
|
|
|
CLI_argumentIsolation( curArgs, &arg1Ptr, &arg2Ptr ); |
|
|
|
|
|
|
|
// Stop processing args if no more are found |
|
|
|
if ( *arg1Ptr == '\0' ) |
|
|
|
break; |
|
|
|
|
|
|
|
// Print out the arg |
|
|
|
dPrint( arg1Ptr ); |
|
|
|
} |
|
|
|
} |
|
|
|
|
|
|
|
void cliFunc_i2cSend( char* args ) |
|
|
|
{ |
|
|
|
char* curArgs; |
|
|
|
char* arg1Ptr; |
|
|
|
char* arg2Ptr = args; |
|
|
|
|
|
|
|
// Buffer used after interpretting the args, will be sent to I2C functions |
|
|
|
// NOTE: Limited to 8 bytes currently (can be increased if necessary |
|
|
|
#define i2cSend_BuffLenMax 8 |
|
|
|
uint8_t buffer[ i2cSend_BuffLenMax ]; |
|
|
|
uint8_t bufferLen = 0; |
|
|
|
|
|
|
|
// No \r\n by default after the command is entered |
|
|
|
print( NL ); |
|
|
|
info_msg("Sending: "); |
|
|
|
|
|
|
|
// Parse args until a \0 is found |
|
|
|
while ( bufferLen < i2cSend_BuffLenMax ) |
|
|
|
{ |
|
|
|
curArgs = arg2Ptr; // Use the previous 2nd arg pointer to separate the next arg from the list |
|
|
|
CLI_argumentIsolation( curArgs, &arg1Ptr, &arg2Ptr ); |
|
|
|
|
|
|
|
// Stop processing args if no more are found |
|
|
|
if ( *arg1Ptr == '\0' ) |
|
|
|
break; |
|
|
|
|
|
|
|
// Interpret the argument |
|
|
|
buffer[ bufferLen++ ] = (uint8_t)numToInt( arg1Ptr ); |
|
|
|
|
|
|
|
// Print out the arg |
|
|
|
dPrint( arg1Ptr ); |
|
|
|
print(" "); |
|
|
|
} |
|
|
|
|
|
|
|
print( NL ); |
|
|
|
|
|
|
|
I2C_Send( buffer, bufferLen, 0 ); |
|
|
|
} |
|
|
|
|
|
|
|
void cliFunc_i2cRecv( char* args ) |
|
|
|
{ |
|
|
|
char* curArgs; |
|
|
|
char* arg1Ptr; |
|
|
|
char* arg2Ptr = args; |
|
|
|
|
|
|
|
// Buffer used after interpretting the args, will be sent to I2C functions |
|
|
|
// NOTE: Limited to 8 bytes currently (can be increased if necessary |
|
|
|
#define i2cSend_BuffLenMax 8 |
|
|
|
uint8_t buffer[ i2cSend_BuffLenMax ]; |
|
|
|
uint8_t bufferLen = 0; |
|
|
|
|
|
|
|
// No \r\n by default after the command is entered |
|
|
|
print( NL ); |
|
|
|
info_msg("Sending: "); |
|
|
|
|
|
|
|
// Parse args until a \0 is found |
|
|
|
while ( bufferLen < i2cSend_BuffLenMax ) |
|
|
|
{ |
|
|
|
curArgs = arg2Ptr; // Use the previous 2nd arg pointer to separate the next arg from the list |
|
|
|
CLI_argumentIsolation( curArgs, &arg1Ptr, &arg2Ptr ); |
|
|
|
|
|
|
|
// Stop processing args if no more are found |
|
|
|
if ( *arg1Ptr == '\0' ) |
|
|
|
break; |
|
|
|
|
|
|
|
// Interpret the argument |
|
|
|
buffer[ bufferLen++ ] = (uint8_t)numToInt( arg1Ptr ); |
|
|
|
|
|
|
|
// Print out the arg |
|
|
|
dPrint( arg1Ptr ); |
|
|
|
print(" "); |
|
|
|
} |
|
|
|
|
|
|
|
print( NL ); |
|
|
|
|
|
|
|
I2C_Send( buffer, bufferLen, 1 ); // Only 1 byte is ever read at a time with the ISSI chip |
|
|
|
} |
|
|
|
|
|
|
|
void cliFunc_ledZero( char* args ) |
|
|
|
{ |
|
|
|
print( NL ); // No \r\n by default after the command is entered |
|
|
|
LED_zeroPages( 0x00, 8, 0xB3 ); |
|
|
|
} |
|
|
|
|
Jacob Alexander
9 years ago