c_meyer/pxt-calliope
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Use constant for end of memory

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This commit is contained in:
Michal Moskal 2016-04-05 19:19:27 -07:00
parent 7fd7e15bd4
commit c9536b0cf2
2 changed files with 6 additions and 5 deletions
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9
libs/i2c-fram/fram.ts
View File

@ -1,5 +1,6 @@
namespace i2c_fram { namespace i2c_fram {
const devaddr = 0x50; const devaddr = 0x50;
const memend = 0x7fff;
//% shim=ksrt::panic //% shim=ksrt::panic
function panic(code: number) { } function panic(code: number) { }
@ -7,7 +8,7 @@ namespace i2c_fram {
function die() { panic(142) } function die() { panic(142) }
export function readByte(addr: number) { export function readByte(addr: number) {
if (addr < 0 || addr > 0xffff) if (addr < 0 || addr > memend)
die(); die();
let buf = pins.createBuffer(2) let buf = pins.createBuffer(2)
@ -21,7 +22,7 @@ namespace i2c_fram {
} }
export function writeByte(addr: number, val: number) { export function writeByte(addr: number, val: number) {
if (addr < 0 || addr > 0xffff) if (addr < 0 || addr > memend)
die(); die();
if (val < 0 || val > 0xff) if (val < 0 || val > 0xff)
@ -37,7 +38,7 @@ namespace i2c_fram {
} }
export function readBuffer(addr: number, length: number) { export function readBuffer(addr: number, length: number) {
if (addr < 0 || length < 0 || (addr + length) > 0xffff) if (addr < 0 || length < 0 || (addr + length) > memend)
die(); die();
let buf = pins.createBuffer(length) let buf = pins.createBuffer(length)
for (let i = 0; i < length; ++i) for (let i = 0; i < length; ++i)
@ -46,7 +47,7 @@ namespace i2c_fram {
} }
export function writeBuffer(addr:number, buf: Buffer) { export function writeBuffer(addr:number, buf: Buffer) {
if (addr < 0 || (addr + buf.length) > 0xffff) if (addr < 0 || (addr + buf.length) > memend)
die(); die();
for (let i = 0; i < buf.length; ++i) for (let i = 0; i < buf.length; ++i)
writeByte(addr + i, buf[i]) writeByte(addr + i, buf[i])

2
libs/i2c-fram/kind.json
View File

@ -12,5 +12,5 @@
"dependencies": { "dependencies": {
"microbit": "file:../microbit" "microbit": "file:../microbit"
}, },
"installedVersion": "hrakif" "installedVersion": "hhneqa"
} }