MicroPython Forum (Archive)

Posted: **Thu Jan 03, 2019 10:55 pm**

Hi,

I'm getting compilation errors

mods/uart.c:222:21: error: incompatible types when assigning to type 'const pin_obj_t * {aka const struct <anonymous> *}' from type 'pin_obj_t {aka struct <anonymous>}'
             pins[1] = MICROPY_HW_UART0_RX;

but everything is just as in the pyboard code (Version 1.9.4).

uart_init2():

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const pin_obj_t *pins[4] = {0};

    switch (uart_obj->uart_id) {
        #if defined(MICROPY_HW_UART0_TX) && defined(MICROPY_HW_UART0_RX)
        case PYB_UART_0:
            uart_unit = 0;
            uart_base = UART0_BASE;
            irqn = INT_UART0_TM4C123;
            pins[0] = MICROPY_HW_UART0_TX;
            pins[1] = MICROPY_HW_UART0_RX;
            peripheral = SYSCTL_PERIPH_UART0;
            break;
        #endif

mpconfigboard.h:

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// UART config
#define MICROPY_HW_UART0_NAME   "0"
#define MICROPY_HW_UART0_RX     (pin_PA0)
#define MICROPY_HW_UART0_TX     (pin_PA1)

pins.c:

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const pin_obj_t pin_PA0  = PIN(PA0   , A,   0, 17, pin_PA0_af, 1, 2);
const pin_obj_t pin_PA1  = PIN(PA1   , A,   1, 18, pin_PA1_af, 1, 2);

Did I miss something?

Thanks
-ExXec

Posted: **Thu Jan 03, 2019 11:15 pm**

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const pin_obj_t *pins[4] = {0};

pins is an array of pointers where each pointer is a pointer to a constant pin_obj_t.

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const pin_obj_t pin_PA0  = PIN(PA0   , A,   0, 17, pin_PA0_af, 1, 2);

pin_A0 is a const pin_obj_t type.

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pins[0] = MICROPY_HW_UART0_TX;

is trying assign a const pin_obj_t to a const pin_obj_t * which doesn't work (i.e. trying to assign an object to a pointer to an object)

If you look in the pyboard build-PYBV11/pins_PYBV11.c you'll notice some subtle differences:

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const pin_obj_t pin_A0_obj = PIN(A, 0, pin_A0_af, PIN_ADC1 | PIN_ADC2 | PIN_ADC3, 0);

(so notice that its pin_A0_obj, not pin_A0.

Then if you look in build-PYBV11/genhdr/pins.h you'll see:

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extern const pin_obj_t pin_A0_obj;
#define pin_A0 (&pin_A0_obj)

so pin_A0 is the same as &pin_A0_obj so the type of pin_A0 is the address of pin_A0_obj which is const pin_obj_t * which is compatible with pins[0]

Posted: **Thu Jan 03, 2019 11:37 pm**

Thank you, I somehow missed those defines

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