42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
static void ram2e_spi_select() { ram2e_cmd(0xEB, 0x04); }
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static void ram2e_spi_deselect() { ram2e_cmd(0xEB, 0x00); }
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static void ram2e_spi_tx8(char data) {
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char i;
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for (i = 0; i < 8; i++) {
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char d = (data >> (7-i)) & 1;
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d <<= 1;
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d |= 0x04;
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ram2e_cmd(0xEB, d);
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d |= 0x01;
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ram2e_cmd(0xEB, d);
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}
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}
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static void ram2e_spi_wren() {
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ram2e_spi_deselect();
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ram2e_spi_select();
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ram2e_spi_tx8(0x06); // 0x06 is write enable
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ram2e_spi_deselect();
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}
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static void ram2e_spi_erase() {
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ram2e_spi_wren();
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ram2e_spi_select();
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ram2e_spi_tx8(0x20); // 0x20 is sector erase (4 kB)
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ram2e_spi_tx8(0x00); // address[23:16]
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ram2e_spi_tx8(0x10); // address[15:8]
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ram2e_spi_tx8(0x00); // address[7:0]
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ram2e_spi_deselect();
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}
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static void ram2e_spi_save(char en8meg, char enled) {
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ram2e_spi_wren();
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ram2e_spi_select();
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ram2e_spi_tx8(0x02); // 0x02 is page (byte) program
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ram2e_spi_tx8(0x00); // address[23:16]
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ram2e_spi_tx8(0x10); // address[15:8]
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ram2e_spi_tx8(0x00); // address[7:0]
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// data[7:0]
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if (!en8meg && !enled) { ram2e_spi_tx8(0x7F); }
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else if (!en8meg && enled) { ram2e_spi_tx8(0x3F); }
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else if ( en8meg && !enled) { ram2e_spi_tx8(0xFF); }
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else if ( en8meg && enled) { ram2e_spi_tx8(0xBF); }
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ram2e_spi_deselect();
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} |