56 lines
1.3 KiB
TypeScript
56 lines
1.3 KiB
TypeScript
namespace i2c_fram {
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const devaddr = 0x50;
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const memend = 0x7fff;
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//% shim=pxtrt::panic
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function panic(code: number) { }
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function die() { panic(142) }
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export function readByte(addr: number) {
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if (addr < 0 || addr > memend)
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die();
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let buf = pins.createBuffer(2)
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buf[0] = (addr >> 8) & 0xff;
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buf[1] = addr & 0xff;
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pins.i2cWriteBuffer(devaddr, buf);
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buf = pins.i2cReadBuffer(devaddr, 1);
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return buf[0];
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}
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export function writeByte(addr: number, val: number) {
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if (addr < 0 || addr > memend)
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die();
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if (val < 0 || val > 0xff)
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die();
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let buf = pins.createBuffer(3)
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buf[0] = (addr >> 8) & 0xff;
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buf[1] = addr & 0xff;
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buf[2] = val;
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pins.i2cWriteBuffer(devaddr, buf)
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}
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export function readBuffer(addr: number, length: number) {
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if (addr < 0 || length < 0 || (addr + length) > memend)
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die();
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let buf = pins.createBuffer(length)
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for (let i = 0; i < length; ++i)
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buf[i] = readByte(addr + i)
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return buf
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}
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export function writeBuffer(addr: number, buf: Buffer) {
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if (addr < 0 || (addr + buf.length) > memend)
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die();
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for (let i = 0; i < buf.length; ++i)
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writeByte(addr + i, buf[i])
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}
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}
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