Initial I2C work for ISSI IS31FL3731
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Jacob Alexander
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b2539041ee
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6 changed files with 948 additions and 0 deletions
659
Scan/MD2/scan_loop.c
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Scan/MD2/scan_loop.c
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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
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I2C0_D = I2C_TxBufferPop();
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return 1;
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}
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// Dirty buffer, I2C already initialized
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return 2;
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}
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void LED_zeroPages( uint8_t startPage, uint8_t numPages, uint8_t pageLen )
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{
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// Page Setup
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uint8_t pageSetup[] = { 0xE8, 0xFD, 0x00 };
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// Max length of a page + chip id + reg start
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uint8_t fullPage[ 0xB3 + 2 ] = { 0 };
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fullPage[0] = 0xE8; // Set chip id, starting reg is already 0x00
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// 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);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
|
||||
// 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 );
|
||||
}
|
||||
|
||||
Loading…
Add table
Add a link
Reference in a new issue