void main(void)
{
uint32_t port, pin, val;
uint32_t uart_port;
uint32_t volatile *reg;
uint32_t apb_freq;
uint32_t uart_baud, uart_clk, lcr;
uint32_t i;
/* A80, Cubieboard4, Red LED On (PH06) */
port = 'H';
pin = 6;
/* PIO Configure */
port -= 'A';
val = *(PIO_REG_CFG(PIO_BASE, port, pin));
val &= ~(0x07 << PIO_REG_CFG_POS(pin));
val |= (PIO_REG_CFG_VAL_OUTPUT << PIO_REG_CFG_POS(pin));
*(PIO_REG_CFG(PIO_BASE, port, pin)) = val;
/* PIO data */
val = *(PIO_REG_DAT(PIO_BASE, port));
val &= ~(1 << pin);
val |= (1 << pin);
*(PIO_REG_DAT(PIO_BASE, port)) = val;
/* A80, Cubieboard4, Red LED On (PH06) */
port = 'H';
pin = 12;
/* PIO Configure */
port -= 'A';
val = *(PIO_REG_CFG(PIO_BASE, port, pin));
val &= ~(0x07 << PIO_REG_CFG_POS(pin));
val |= (PIO_REG_CFG_VAL_IO<< PIO_REG_CFG_POS(pin));
*(PIO_REG_CFG(PIO_BASE, port, pin)) = val;
/* PIO level */
val = *(PIO_REG_LVL(PIO_BASE, port, pin));
val &= ~(0x0F << PIO_REG_LVL_POS(pin));
val |= (PIO_REG_LVL_VAL_1 << PIO_REG_LVL_POS(pin));
*(PIO_REG_LVL(PIO_BASE, port, pin)) = val;
/* PIO Pull */
val = *(PIO_REG_PUL(PIO_BASE, port, pin));
val &= ~(0x0F << PIO_REG_PUL_POS(pin));
val |= (PIO_REG_PUL_VAL_HIGH << PIO_REG_PUL_POS(pin));
*(PIO_REG_PUL(PIO_BASE, port, pin)) = val;
/****************************************************************************
* Magic ...
****************************************************************************/
#if 0
/* Timer init */
CCMU_REG_AVS |= (1U << 31);
TMRC_AVS_CTRL = 3;
TMRC_AVS_DIVISOR = 0xC2EE0;
TMRC_AVS_COUNT0 = 0;
TMRC_AVS_COUNT1 = 0;
#endif
/* PLL init, just for UART to work? */
//CCM_CPU_SOURCECTRL &= ~(0x01);
CCM_PLL4_PERP0_CTRL = 0x80002800;
//CCM_PLL12_PERP1_CTRL = 0x80003200;
/* UART config */
uart_port = 0;
//reset
reg = (uint32_t volatile *)(0x06000400 + 0x1B4);
*reg &= ~(1 << (16 + uart_port));
for( i = 0; i < 100; i++ );
*reg |= (1 << (16 + uart_port));
//gate
reg = (uint32_t volatile *)(0x06000400 + 0x194);
*reg &= ~(1 << (16 + uart_port));
for( i = 0; i < 100; i++ );
*reg |= (1 << (16 + uart_port));
// magic!
*((uint32_t volatile *)0x01c202D8) |= (1 << (16 + uart_port));
// Set Baudrate
apb_freq = 24 * 1000 * 1000;
uart_baud = 115200;
uart_clk = ( apb_freq + 8*uart_baud ) / (16*uart_baud);
lcr = UART_REG_LCR(uart_port);
UART_REG_HALT(uart_port) = 1;
UART_REG_LCR(uart_port) = lcr | 0x80;
UART_REG_DLH(uart_port) = uart_clk>>8;
UART_REG_DLL(uart_port) = uart_clk&0xff;
UART_REG_LCR(uart_port) = lcr & (~0x80);
UART_REG_HALT(uart_port) = 0;
// Set Lin Control Register
UART_REG_LCR(uart_port) = ((0 /*PARITY*/ &0x03)<<3) | ((0/*STOP*/&0x01)<<2) | (3/*DLEN = 8*/&0x03);
// Disable FIFOs
UART_REG_FCR(uart_port) = 0x06;
// Namaste!
{
char const * p_namaste = "\r\nNamaste !\r\n";
while (*p_namaste)
{
while (!SERIAL_WRITE_READY(uart_port));
SERIAL_WRITE_CHAR(uart_port, *p_namaste++);
}
}
/****************************************************************************
* ... magic.
****************************************************************************/
#if 1
/* A80, Cubieboard4, Green LED On (PH17) */
port = 'H';
pin = 17;
/* PIO Configure */
port -= 'A';
val = *(PIO_REG_CFG(PIO_BASE, port, pin));
val &= ~(0x07 << PIO_REG_CFG_POS(pin));
val |= (PIO_REG_CFG_VAL_OUTPUT << PIO_REG_CFG_POS(pin));
*(PIO_REG_CFG(PIO_BASE, port, pin)) = val;
/* PIO data */
val = *(PIO_REG_DAT(PIO_BASE, port));
val &= ~(1 << pin);
val |= (1 << pin);
*(PIO_REG_DAT(PIO_BASE, port)) = val;
#endif
while(1);
}
void UART_putchar(char c)
{
while (!SERIAL_WRITE_READY());
SERIAL_WRITE_CHAR(c);
}
