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kaklik |
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#ifndef __twi_aap_h__ |
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#define __two_aap_h__ |
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#include <compat/twi.h> |
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#include "common.h" |
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#include "usart.h" |
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#include "guids.h" |
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#include "eeprom.h" |
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//#define SERIAL_DBG |
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namespace EEPROM_layout { |
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const uint16_t TWI_SoftAddr_Ofs = 0xff; |
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} |
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namespace TWI { |
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const uint8_t GeneralCallAddr = 0; |
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const size_t UniqueID_Size = 16*3; |
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const size_t GUID_Size = sizeof(GUID); |
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struct sConfigRecord { |
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uint8_t UniqueID[UniqueID_Size]; |
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GUID ClassID; |
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GUID DevID; |
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}; |
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enum TWI_AAPCommands { |
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TWI_AAPCmd_Reserved = 0, |
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TWI_AAPCmd_Start = 0x20, |
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TWI_AAPCmd_End = 0x21, |
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TWI_AAPCmd_ResetDevices = 0x22, |
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TWI_AAPCmd_ResetToPermAddress = 0x23, |
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TWI_AAPCmd_GetConfig = 0x24, |
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TWI_AAPCmd_AssignAddress = 0x25 |
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}; |
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enum MainStates { |
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MS_Idle = 0, |
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MS_Addressed, |
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AAP_CmdGetConfig_GetAddress, |
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AAP_CmdGetConfig_SendConfig, |
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AAP_CmdAssignAddress_GetUniqueID, |
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AAP_CmdAssignAddress_GetAddress, |
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US_Base |
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}; |
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extern uint8_t State; |
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extern uint8_t LastCmd; |
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extern uint8_t SoftAddress; |
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inline void Init() { |
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TWBR = 32; // 100kHz with an 8MHz crystal |
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// TWBR = 16; // 200kHz with an 8MHz crystal |
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TWSR = 0; // pre-scaler: 1 |
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TWCR = (1 << TWEA) | (1 << TWEN) | (1 << TWIE) | (1 << TWINT); |
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if (TWSR == TW_BUS_ERROR) SETBIT(TWCR,(1 << TWSTO)); // reset TWI |
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TWAMR = 0; // all address bits matter |
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State = MS_Idle; |
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SoftAddress = EEPROM::GetByte(EEPROM_layout::TWI_SoftAddr_Ofs); |
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if (SoftAddress == 0xff) SoftAddress = 0; |
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SoftAddress &= 0xfe; |
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// TWAR = GeneralCallAddr | 1; // General call recognition and slave-receiver mode through address being 0 |
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TWAR = SoftAddress | 1; |
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LastCmd = TWI_AAPCmd_Reserved; |
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} |
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// These used in all states, including user states, so make them available. |
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extern uint8_t TWIStatus; |
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extern uint8_t TWIData; |
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extern uint8_t TWIPrevData; |
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extern uint8_t TWIControl; |
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void ResetTWITransmit(); |
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void ResetTWIReceive(); |
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void ResetTWI(); |
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} |
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#endif // __twi_aap_h__ |