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89 lines
2.4 KiB
89 lines
2.4 KiB
7 years ago
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// Created by MightyPork on 2018/01/02.
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//
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#include "comm/messages.h"
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#include "unit_base.h"
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#include "utils/avrlibc.h"
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#include "unit_i2c.h"
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// I2C master
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#define I2C_INTERNAL
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#include "_i2c_internal.h"
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enum PinCmd_ {
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CMD_WRITE = 0,
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CMD_READ = 1,
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CMD_WRITE_REG = 2,
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CMD_READ_REG = 3,
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};
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/** Handle a request message */
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static error_t UI2C_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, PayloadParser *pp)
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{
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uint16_t addr;
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uint32_t len;
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uint8_t regnum;
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uint32_t size;
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// NOTE: 10-bit addresses must have the highest bit set to 1 for indication (0x8000 | addr)
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switch (command) {
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/** Write byte(s) - addr:u16, byte(s) */
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case CMD_WRITE:
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addr = pp_u16(pp);
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const uint8_t *bb = pp_tail(pp, &len);
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return UU_I2C_Write(unit, addr, bb, len);
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/** Read byte(s) - addr:u16, len:u16 */
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case CMD_READ:
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addr = pp_u16(pp);
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len = pp_u16(pp);
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TRY(UU_I2C_Read(unit, addr, (uint8_t *) unit_tmp512, len));
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com_respond_buf(frame_id, MSG_SUCCESS, (uint8_t *) unit_tmp512, len);
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return E_SUCCESS;
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/** Read register(s) - addr:u16, reg:u8, size:u16 */
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case CMD_READ_REG:;
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addr = pp_u16(pp);
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regnum = pp_u8(pp); // register number
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size = pp_u16(pp); // total number of bytes to read (allows use of auto-increment)
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TRY(UU_I2C_ReadReg(unit, addr, regnum, (uint8_t *) unit_tmp512, size));
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com_respond_buf(frame_id, MSG_SUCCESS, (uint8_t *) unit_tmp512, size);
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return E_SUCCESS;
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/** Write a register - addr:u16, reg:u8, byte(s) */
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case CMD_WRITE_REG:
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addr = pp_u16(pp);
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regnum = pp_u8(pp); // register number
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const uint8_t *tail = pp_tail(pp, &size);
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return UU_I2C_WriteReg(unit, addr, regnum, tail, size);
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default:
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return E_UNKNOWN_COMMAND;
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}
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}
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// ------------------------------------------------------------------------
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/** Unit template */
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const UnitDriver UNIT_I2C = {
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.name = "I2C",
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.description = "I2C master",
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// Settings
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.preInit = UI2C_preInit,
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.cfgLoadBinary = UI2C_loadBinary,
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.cfgWriteBinary = UI2C_writeBinary,
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.cfgLoadIni = UI2C_loadIni,
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.cfgWriteIni = UI2C_writeIni,
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// Init
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.init = UI2C_init,
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.deInit = UI2C_deInit,
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// Function
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.handleRequest = UI2C_handleRequest,
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};
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