| 90 | } |
| 91 | |
| 92 | void xs_i2c_read(xsMachine *the) |
| 93 | { |
| 94 | modI2C i2c; |
| 95 | int argc = xsmcArgc; |
| 96 | unsigned int len = xsmcToInteger(xsArg(0)), i; |
| 97 | unsigned char err; |
| 98 | unsigned char buffer[40]; |
| 99 | |
| 100 | if (len > sizeof(buffer)) |
| 101 | xsUnknownError("40 byte read limit"); |
| 102 | |
| 103 | i2c = xsmcGetHostChunk(xsThis); |
| 104 | err = modI2CRead(&i2c->state, buffer, len, true); |
| 105 | if (err) |
| 106 | return; // undefined returned on read failure |
| 107 | |
| 108 | if (argc >= 2) { |
| 109 | int bufferByteLength; |
| 110 | xsResult = xsArg(1); |
| 111 | bufferByteLength = xsmcGetArrayBufferLength(xsResult); |
| 112 | if (bufferByteLength < len) |
| 113 | xsUnknownError("buffer too small"); |
| 114 | c_memmove(xsmcToArrayBuffer(xsResult), buffer, len); |
| 115 | } |
| 116 | else { |
| 117 | xsmcSetArrayBuffer(xsResult, buffer, len); |
| 118 | xsResult = xsNew1(xsGlobal, xsID_Uint8Array, xsResult); |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | void xs_i2c_write(xsMachine *the) |
| 123 | { |
nothing calls this directly
no test coverage detected