Add a new utility, cpfactory.

cpfactory sets the cp2103 port configuration back to factory defaults.  Note
that these defaults have not been verified by talking to a factory fresh cp2103
part.  I suppose this code will work for any cp210x part.

diff --git a/src/examples/Makefile b/src/examples/Makefile
index e42f8236696a2e69b5e6ef3cb1e2977abe37c25c..0689cd7d6b9011d66fa541d0c1915a23cf27493c 100644 (file)
--- a/src/examples/Makefile
+++ b/src/examples/Makefile
@@ -1,6 +1,6 @@
 .PHONY: all
 
-PROGS = cpmfg cpread cpio cptwiddle
+PROGS = cpmfg cpread cpio cptwiddle cpfactory
 # LDFLAGS += -lusb
 
 all: $(PROGS)

diff --git a/src/examples/cpfactory.c b/src/examples/cpfactory.c
new file mode 100644 (file)
index 0000000..be9594b
--- /dev/null
+++ b/src/examples/cpfactory.c
@@ -0,0 +1,156 @@
+/**
+ * cpfactory.c
+ *
+ * Reset the cp2103 IO registers back to factory defaults.
+ */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+/* CP2103 ioctls */
+#define IOCTL_GPIOGET          0x8000  /* Get gpio bits */
+#define IOCTL_GPIOSET          0x8001  /* Set gpio bits */
+#define IOCTL_GPIOBIC          0x8002  /* Clear specific gpio bit(s) */
+#define IOCTL_GPIOBIS          0x8003  /* Set specific gpio bit(s) */
+
+/* CP210x ioctls principally used during initial device configuration */
+#define IOCTL_DEVICERESET      0x8004  /* Reset the cp210x */
+#define IOCTL_PORTCONFGET      0x8005  /* Get port configuration */
+#define IOCTL_PORTCONFSET      0x8006  /* Set port configuration */
+#define IOCTL_SETVID           0x8007  /* Set vendor id */
+#define IOCTL_SETPID           0x8008  /* Set product id */
+#define IOCTL_SETMFG           0x8009  /* Set manufacturer string */
+#define IOCTL_SETPRODUCT       0x800a  /* Set product string */
+#define IOCTL_SETSERIAL                0x800b  /* Set serial number string */
+#define IOCTL_SETDEVVER                0x800c  /* set device version id */
+/* FIXME: where is IOCTL_SETMFG? */
+
+
+typedef struct {
+    uint16_t mode;
+    uint16_t lowPower;
+    uint16_t latch;
+} cp2103_port_state_t;
+
+typedef struct {
+    cp2103_port_state_t reset;
+    cp2103_port_state_t suspend;
+    uint8_t enhancedFxn;
+} cp2103_port_config_t;
+
+int cpConnect(char* device)
+{
+    int ret, ioval;
+    int fd = open(device, O_RDWR);
+    if (fd < 0) {
+       fprintf(stderr, "cannot open tty\n");
+       return -1;
+    }
+    printf("tty opened\n");
+    return fd;
+}
+
+void cpDisconnect(int fd)
+{
+    if (fd >= 0)
+       close(fd);
+}
+
+int main(int argc, char* argv[])
+{
+    int fd;
+    cp2103_port_config_t config;
+    cp2103_port_config_t saveConfig;
+    uint8_t saveGpio;
+    int ret;
+    int i;
+
+    if (argc != 2) {
+       fprintf(stderr, "usage: %s <tty>\n", argv[0]);
+       return 1;
+    }
+
+    /* open */
+    if ((fd = cpConnect(argv[1])) < 0)
+       return 1;
+
+    /* Read the current port configuration */
+    if ((ret = ioctl(fd, IOCTL_PORTCONFGET, &config))) {
+       fprintf(stderr, "portconfget ioctl failed %d\n", ret);
+       return 1;
+    }
+    printf("port config received\n");
+
+    /* Mode and latch bit to pin assignments. See AN223 from SiLabs:
+     * https://www.silabs.com/Support Documents/TechnicalDocs/an223.pdf
+     *
+     *  15 - /SUSPEND
+     *  14 - SUSPEND (maybe)
+     *  13 - unused (or SUSPEND)
+     *  12 - unused (or SUSPEND)
+     *  11 - GPIO_3
+     *  10 - GPIO_2
+     *   9 - GPIO_1
+     *   8 - GPIO_0
+     *   7 - /CTS
+     *   6 - /RTS
+     *   5 - RXD       Note: set latch value to '1' for proper operation.
+     *   4 - TXD
+     *   3 - /DSR
+     *   2 - /DTR
+     *   1 - /DCD
+     *   0 - /RI
+     *
+     * Mode bit values:
+     *   1 - A value of one in a bit places the corresponding IO pin in push-
+     *       pull output mode.
+     *   0 - A value of zero in a bit places the corresponding IO pin in open-
+     *       drain output mode.
+     *
+     * Latch bit values:
+     *   1 - A value of one in a bit sets the corresponding IO pin's value to
+     *       output high.  If the mode is push-pull, the pin sources current
+     *       from VIO.  If the mode is open-drain, the pin driver is in high
+     *       impedance.
+     *   0 - A value of zero in a bit sets the corresponding IO pin's value to
+     *       output low.  In either mode, push-pull or open-drain, the pin
+     *       driver sinks current to ground.
+     *
+     * Enhanced function bits:
+     *   7 - maybe dynamic suspend for UART or GPIO
+     *   6 - maybe dynamic suspend for UART or GPIO
+     *   5 - maybe dynamic suspend for UART or GPIO
+     *   4 - Enable weak pull-ups
+     *   3 - unused
+     *   2 - /RS485_TX on GPIO_2
+     *   1 - /RXACT on GPIO_1
+     *   0 - /TXACT on GPIO_0
+     */
+    config.reset.mode = 0xf054;
+    config.suspend.mode = 0xf054;
+    config.reset.latch = 0x0fff;       /* RXD must be 1 for some reason */
+    config.suspend.latch = 0x0fff;     /* RXD must be 1 for some reason */
+    config.enhancedFxn = 0x00;
+
+    if ((ret = ioctl(fd, IOCTL_PORTCONFSET, &config))) {
+       fprintf(stderr, "portconfset ioctl failed %d\n", ret);
+       return 1;
+    }
+    printf("port config altered\n");
+
+    /* Reset the part */
+    if ((ret = ioctl(fd, IOCTL_DEVICERESET, 0))) {
+       fprintf(stderr, "device reset ioctl failed %d\n", ret);
+       return 1;
+    }
+    printf("device reset\n");
+
+    /* Disconnect then reconnect */
+    cpDisconnect(fd);
+    return 0;
+}