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tools/emul/shell: add debug output
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83e375936c
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@ -25,6 +25,8 @@
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* 3 - Filesystem blockdev seek / tell. High byte
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*/
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//#define DEBUG
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// in sync with shell.asm
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#define RAMSTART 0x4000
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#define STDIO_PORT 0x00
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@ -51,8 +53,12 @@ static uint8_t io_read(int unused, uint16_t addr)
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return c;
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} else if (addr == FS_DATA_PORT) {
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if (fsdev_ptr < fsdev_size) {
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#ifdef DEBUG
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fprintf(stderr, "Reading FSDEV at offset %d\n", fsdev_ptr);
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#endif
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return fsdev[fsdev_ptr++];
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} else {
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fprintf(stderr, "Out of bounds FSDEV read at %d\n", fsdev_ptr);
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return 0;
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}
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} else if (addr == FS_SEEKL_PORT) {
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@ -79,6 +85,8 @@ static void io_write(int unused, uint16_t addr, uint8_t val)
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} else if (addr == FS_DATA_PORT) {
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if (fsdev_ptr < fsdev_size) {
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fsdev[fsdev_ptr++] = val;
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} else {
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fprintf(stderr, "Out of bounds FSDEV write at %d\n", fsdev_ptr);
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}
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} else if (addr == FS_SEEKL_PORT) {
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fsdev_ptr = (fsdev_ptr & 0xffff00) | val;
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