altos: Add debug command for 74hc597 driver

This dumps the current state of the 74hc597 chip.

Note that this shows that the 74hc597 driver doesn't work, and that
the circuit used in telefire v0.1 can't work.

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/src/drivers/ao_74hc497.c b/src/drivers/ao_74hc497.c
index 93c544c34cab9e0d03c92a2d567b2ad9640e4511..4c13ee71e1a534c86cfe6ccf99ca0d273143799f 100644 (file)
--- a/src/drivers/ao_74hc497.c
+++ b/src/drivers/ao_74hc497.c
@@ -28,13 +28,28 @@ ao_74hc497_read(void)
 {
        static __xdata state;
        ao_spi_get_bit(AO_74HC497_CS_PORT, AO_74HC497_CS_PIN, AO_74HC497_CS, AO_74HC497_SPI_BUS, AO_SPI_SPEED_FAST);
-       ao_spi_send(&state, 1, AO_74HC497_SPI_BUS);
+       ao_spi_recv(&state, 1, AO_74HC497_SPI_BUS);
        ao_spi_put_bit(AO_74HC497_CS_PORT, AO_74HC497_CS_PIN, AO_74HC497_CS, AO_74HC497_SPI_BUS);
        return state;
 }
 
+static void
+ao_74hc497_cmd(void)
+{
+       uint8_t v;
+
+       v = ao_74hc497_read();
+       printf ("Switches: 0x%02x\n", v);
+}
+
+static const struct ao_cmds ao_74hc497_cmds[] = {
+       { ao_74hc497_cmd, "L\0Show 74hc497" },
+       { 0, NULL }
+};
+
 void
 ao_74hc497_init(void)
 {
        ao_enable_output(AO_74HC497_CS_PORT, AO_74HC497_CS_PIN, AO_74HC497_CS, 1);
+       ao_cmd_register(&ao_74hc497_cmds[0]);
 }