Sameera Nawarathne / SEEED_CAN

eeprom adding

Fork of SEEED_CAN by Sophie Dexter

seeed_can_spi.cpp@3:29448355ef3a, 2017-03-10 (annotated)

Committer:
sameera0824
Date:
Fri Mar 10 09:32:20 2017 +0000
Revision:
3:29448355ef3a
Parent:
2:fd026fcfde94 
EEPROM chack

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Just4pLeisure 0:f5d099885d3d 1 /* seeed_can_spi.cpp
Just4pLeisure 0:f5d099885d3d 2 * Copyright (c) 2013 Sophie Dexter
Just4pLeisure 0:f5d099885d3d 3 *
Just4pLeisure 0:f5d099885d3d 4 * Licensed under the Apache License, Version 2.0 (the "License");
Just4pLeisure 0:f5d099885d3d 5 * you may not use this file except in compliance with the License.
Just4pLeisure 0:f5d099885d3d 6 * You may obtain a copy of the License at
Just4pLeisure 0:f5d099885d3d 7 *
Just4pLeisure 0:f5d099885d3d 8 * http://www.apache.org/licenses/LICENSE-2.0
Just4pLeisure 0:f5d099885d3d 9 *
Just4pLeisure 0:f5d099885d3d 10 * Unless required by applicable law or agreed to in writing, software
Just4pLeisure 0:f5d099885d3d 11 * distributed under the License is distributed on an "AS IS" BASIS,
Just4pLeisure 0:f5d099885d3d 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Just4pLeisure 0:f5d099885d3d 13 * See the License for the specific language governing permissions and
Just4pLeisure 0:f5d099885d3d 14 * limitations under the License.
Just4pLeisure 0:f5d099885d3d 15 */
Just4pLeisure 0:f5d099885d3d 16
Just4pLeisure 0:f5d099885d3d 17 #include "seeed_can_spi.h"
Just4pLeisure 0:f5d099885d3d 18
Just4pLeisure 0:f5d099885d3d 19 /** reset the MCP2515
Just4pLeisure 0:f5d099885d3d 20 */
Just4pLeisure 2:fd026fcfde94 21 void mcpReset(mcp_can_t *obj)
Just4pLeisure 0:f5d099885d3d 22 {
Just4pLeisure 0:f5d099885d3d 23 obj->ncs = 0;
Just4pLeisure 0:f5d099885d3d 24 obj->spi.write(MCP_RESET);
Just4pLeisure 0:f5d099885d3d 25 obj->ncs = 1;
Just4pLeisure 0:f5d099885d3d 26 wait_ms(10);
Just4pLeisure 0:f5d099885d3d 27 }
Just4pLeisure 0:f5d099885d3d 28
Just4pLeisure 0:f5d099885d3d 29 /** read from a single MCP2515 register
Just4pLeisure 0:f5d099885d3d 30 */
Just4pLeisure 2:fd026fcfde94 31 uint8_t mcpRead(mcp_can_t *obj, const uint8_t address)
Just4pLeisure 0:f5d099885d3d 32 {
Just4pLeisure 0:f5d099885d3d 33 uint8_t result;
Just4pLeisure 0:f5d099885d3d 34
Just4pLeisure 0:f5d099885d3d 35 obj->ncs = 0;
Just4pLeisure 0:f5d099885d3d 36 obj->spi.write(MCP_READ);
Just4pLeisure 0:f5d099885d3d 37 obj->spi.write(address);
Just4pLeisure 0:f5d099885d3d 38 result = obj->spi.write(0x00);
Just4pLeisure 0:f5d099885d3d 39 obj->ncs = 1;
Just4pLeisure 0:f5d099885d3d 40 return result;
Just4pLeisure 0:f5d099885d3d 41 }
Just4pLeisure 0:f5d099885d3d 42
Just4pLeisure 0:f5d099885d3d 43 /** read multiple MCP2515 registers sequentially into an array (relies on address auto-increment)
Just4pLeisure 0:f5d099885d3d 44 */
Just4pLeisure 2:fd026fcfde94 45 void mcpReadMultiple(mcp_can_t *obj, const uint8_t address, uint8_t values[], const uint8_t n)
Just4pLeisure 0:f5d099885d3d 46 {
Just4pLeisure 0:f5d099885d3d 47 obj->ncs = 0;
Just4pLeisure 0:f5d099885d3d 48 obj->spi.write(MCP_READ);
Just4pLeisure 0:f5d099885d3d 49 obj->spi.write(address);
Just4pLeisure 0:f5d099885d3d 50 for (uint32_t i=0; i<n; i++) {
Just4pLeisure 0:f5d099885d3d 51 values[i] = obj->spi.write(0x00);
Just4pLeisure 0:f5d099885d3d 52 }
Just4pLeisure 0:f5d099885d3d 53 obj->ncs = 1;
Just4pLeisure 0:f5d099885d3d 54 }
Just4pLeisure 0:f5d099885d3d 55
Just4pLeisure 0:f5d099885d3d 56 /** read the specified MCP2515 receive buffer into an array (needs one fewer SPI transfer than mcpReadMultiple)
Just4pLeisure 0:f5d099885d3d 57 */
Just4pLeisure 2:fd026fcfde94 58 void mcpReadBuffer(mcp_can_t *obj, const uint8_t command, uint8_t values[], const uint8_t n)
Just4pLeisure 0:f5d099885d3d 59 {
Just4pLeisure 0:f5d099885d3d 60 obj->ncs = 0;
Just4pLeisure 0:f5d099885d3d 61 obj->spi.write(command);
Just4pLeisure 0:f5d099885d3d 62 for (uint32_t i=0; i<n; i++) {
Just4pLeisure 0:f5d099885d3d 63 values[i] = obj->spi.write(0x00);
Just4pLeisure 0:f5d099885d3d 64 }
Just4pLeisure 0:f5d099885d3d 65 obj->ncs = 1;
Just4pLeisure 0:f5d099885d3d 66 }
Just4pLeisure 0:f5d099885d3d 67
Just4pLeisure 0:f5d099885d3d 68 /** write to a single MCP2515 register
Just4pLeisure 0:f5d099885d3d 69 */
Just4pLeisure 2:fd026fcfde94 70 void mcpWrite(mcp_can_t *obj, const uint8_t address, const uint8_t value)
Just4pLeisure 0:f5d099885d3d 71 {
Just4pLeisure 0:f5d099885d3d 72 obj->ncs = 0;
Just4pLeisure 0:f5d099885d3d 73 obj->spi.write(MCP_WRITE);
Just4pLeisure 0:f5d099885d3d 74 obj->spi.write(address);
Just4pLeisure 0:f5d099885d3d 75 obj->spi.write(value);
Just4pLeisure 0:f5d099885d3d 76 obj->ncs = 1;
Just4pLeisure 0:f5d099885d3d 77 }
Just4pLeisure 0:f5d099885d3d 78
Just4pLeisure 0:f5d099885d3d 79 /** write to multiple MCP2515 registers consecutively from an array
Just4pLeisure 0:f5d099885d3d 80 */
Just4pLeisure 2:fd026fcfde94 81 void mcpWriteMultiple(mcp_can_t *obj, const uint8_t address, const uint8_t values[], const uint8_t n)
Just4pLeisure 0:f5d099885d3d 82 {
Just4pLeisure 0:f5d099885d3d 83 obj->ncs = 0;
Just4pLeisure 0:f5d099885d3d 84 obj->spi.write(MCP_WRITE);
Just4pLeisure 0:f5d099885d3d 85 obj->spi.write(address);
Just4pLeisure 0:f5d099885d3d 86 for (uint32_t i=0; i<n; i++) {
Just4pLeisure 0:f5d099885d3d 87 obj->spi.write(values[i]);
Just4pLeisure 0:f5d099885d3d 88 }
Just4pLeisure 0:f5d099885d3d 89 obj->ncs = 1;
Just4pLeisure 0:f5d099885d3d 90 }
Just4pLeisure 0:f5d099885d3d 91
Just4pLeisure 0:f5d099885d3d 92 /** write to the specified MCP2515 transmit buffer from an array (needs one fewer SPI transfer than mcpWriteMultiple)
Just4pLeisure 0:f5d099885d3d 93 */
Just4pLeisure 2:fd026fcfde94 94 void mcpWriteBuffer(mcp_can_t *obj, const uint8_t command, uint8_t values[], const uint8_t n)
Just4pLeisure 0:f5d099885d3d 95 {
Just4pLeisure 0:f5d099885d3d 96 obj->ncs = 0;
Just4pLeisure 0:f5d099885d3d 97 obj->spi.write(command);
Just4pLeisure 0:f5d099885d3d 98 for (uint32_t i=0; i<n; i++) {
Just4pLeisure 0:f5d099885d3d 99 obj->spi.write(values[i]);
Just4pLeisure 0:f5d099885d3d 100 }
Just4pLeisure 0:f5d099885d3d 101 obj->ncs = 1;
Just4pLeisure 0:f5d099885d3d 102 }
Just4pLeisure 0:f5d099885d3d 103
Just4pLeisure 0:f5d099885d3d 104 /** initiate transmission of the specified MCP2515 transmit buffer
Just4pLeisure 0:f5d099885d3d 105 */
Just4pLeisure 2:fd026fcfde94 106 void mcpBufferRTS(mcp_can_t *obj, const uint8_t command)
Just4pLeisure 0:f5d099885d3d 107 {
Just4pLeisure 0:f5d099885d3d 108 obj->ncs = 0;
Just4pLeisure 0:f5d099885d3d 109 obj->spi.write(command);
Just4pLeisure 0:f5d099885d3d 110 obj->ncs = 1;
Just4pLeisure 0:f5d099885d3d 111 }
Just4pLeisure 0:f5d099885d3d 112
Just4pLeisure 0:f5d099885d3d 113 /** read mcp2515's status register
Just4pLeisure 0:f5d099885d3d 114 */
Just4pLeisure 2:fd026fcfde94 115 uint8_t mcpStatus(mcp_can_t *obj)
Just4pLeisure 0:f5d099885d3d 116 {
Just4pLeisure 0:f5d099885d3d 117 uint8_t status;
Just4pLeisure 0:f5d099885d3d 118
Just4pLeisure 0:f5d099885d3d 119 obj->ncs = 0;
Just4pLeisure 0:f5d099885d3d 120 obj->spi.write(MCP_READ_STATUS);
Just4pLeisure 0:f5d099885d3d 121 status = obj->spi.write(0x00);
Just4pLeisure 0:f5d099885d3d 122 obj->ncs = 1;
Just4pLeisure 0:f5d099885d3d 123 return status;
Just4pLeisure 0:f5d099885d3d 124 }
Just4pLeisure 0:f5d099885d3d 125
Just4pLeisure 0:f5d099885d3d 126 /** read mcp2515's receive status register
Just4pLeisure 0:f5d099885d3d 127 */
Just4pLeisure 2:fd026fcfde94 128 uint8_t mcpReceiveStatus(mcp_can_t *obj)
Just4pLeisure 0:f5d099885d3d 129 {
Just4pLeisure 0:f5d099885d3d 130 uint8_t status;
Just4pLeisure 0:f5d099885d3d 131
Just4pLeisure 0:f5d099885d3d 132 obj->ncs = 0;
Just4pLeisure 0:f5d099885d3d 133 obj->spi.write(MCP_RX_STATUS);
Just4pLeisure 0:f5d099885d3d 134 status = obj->spi.write(0x00);
Just4pLeisure 0:f5d099885d3d 135 obj->ncs = 1;
Just4pLeisure 0:f5d099885d3d 136 return status;
Just4pLeisure 0:f5d099885d3d 137 }
Just4pLeisure 0:f5d099885d3d 138
Just4pLeisure 0:f5d099885d3d 139 /** modify bits of a register specified by a mask
Just4pLeisure 0:f5d099885d3d 140 */
Just4pLeisure 2:fd026fcfde94 141 void mcpBitModify(mcp_can_t *obj, const uint8_t address, const uint8_t mask, const uint8_t data)
Just4pLeisure 0:f5d099885d3d 142 {
Just4pLeisure 0:f5d099885d3d 143 obj->ncs = 0;
Just4pLeisure 0:f5d099885d3d 144 obj->spi.write(MCP_BITMOD);
Just4pLeisure 0:f5d099885d3d 145 obj->spi.write(address);
Just4pLeisure 0:f5d099885d3d 146 obj->spi.write(mask);
Just4pLeisure 0:f5d099885d3d 147 obj->spi.write(data);
Just4pLeisure 0:f5d099885d3d 148 obj->ncs = 1;
Just4pLeisure 0:f5d099885d3d 149 }