1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
/*
* Copyright © 2013 Eugeniy Meshcheryakov <eugen@debian.org>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#include <bsp.h>
#include <bspopts.h>
#include <bsp/irq-generic.h>
#include <bsp/lm3s69xx.h>
#include <bsp/io.h>
#include <bsp/syscon.h>
#include <assert.h>
static void init_main_osc(void)
{
volatile lm3s69xx_syscon *syscon = LM3S69XX_SYSCON;
uint32_t sysdiv_val = LM3S69XX_PLL_FREQUENCY / LM3S69XX_SYSTEM_CLOCK;
assert(sysdiv_val * LM3S69XX_SYSTEM_CLOCK == LM3S69XX_PLL_FREQUENCY);
assert((sysdiv_val >= 4) && (sysdiv_val <= 16));
uint32_t rcc = syscon->rcc;
rcc = (rcc & ~SYSCONRCC_USESYSDIV) | SYSCONRCC_BYPASS;
syscon->rcc = rcc;
rcc = (rcc & ~(SYSCONRCC_PWRDN | SYSCONRCC_XTAL_MSK | SYSCONRCC_OSCSRC_MSK))
| SYSCONRCC_XTAL(LM3S69XX_XTAL_CONFIG) | SYSCONRCC_OSCSRC_MOSC;
syscon->rcc = rcc;
rcc = (rcc & ~SYSCONRCC_SYSDIV_MSK) | SYSCONRCC_SYSDIV(sysdiv_val / 2 - 1)
| SYSCONRCC_USESYSDIV;
syscon->rcc = rcc;
while ((syscon->ris & SYSCONRIS_PLLLRIS) == 0)
/* Wait for PLL lock */;
rcc &= ~SYSCONRCC_BYPASS;
syscon->rcc = rcc;
}
static const lm3s69xx_gpio_config start_config_gpio[] = {
#ifdef LM3S69XX_ENABLE_UART_0
#if defined(LM3S69XX_MCU_LM3S3749) || defined(LM3S69XX_MCU_LM3S6965)
LM3S69XX_PIN_UART_RX(LM3S69XX_PORT_A, 0),
LM3S69XX_PIN_UART_TX(LM3S69XX_PORT_A, 1),
#else
#error No GPIO pin configuration for UART 0
#endif
#endif /* LM3S69XX_ENABLE_UART_0 */
#ifdef LM3S69XX_ENABLE_UART_1
#if defined(LM3S69XX_MCU_LM3S3749)
LM3S69XX_PIN_UART_RX(LM3S69XX_PORT_B, 0),
LM3S69XX_PIN_UART_TX(LM3S69XX_PORT_B, 1),
#elif defined(LM3S69XX_MCU_LM3S6965)
LM3S69XX_PIN_UART_RX(LM3S69XX_PORT_D, 2);
LM3S69XX_PIN_UART_TX(LM3S69XX_PORT_D, 3);
#else
#error No GPIO pin configuration for UART 1
#endif
#endif /* LM3S69XX_ENABLE_UART_1 */
#ifdef LM3S69XX_ENABLE_UART_2
#if defined(LM3S69XX_MCU_LM3S3749)
LM3S69XX_PIN_UART_RX(LM3S69XX_PORT_D, 0),
LM3S69XX_PIN_UART_TX(LM3S69XX_PORT_D, 1),
#elif defined(LM3S69XX_MCU_LM3S6965)
LM3S69XX_PIN_UART_RX(LM3S69XX_PORT_G, 0),
LM3S69XX_PIN_UART_TX(LM3S69XX_PORT_G, 1),
#else
#error No GPIO pin configuration for UART 2
#endif
#endif /* LM3S69XX_ENABLE_UART_2 */
};
static void init_gpio(void)
{
#if LM3S69XX_USE_AHB_FOR_GPIO
volatile lm3s69xx_syscon *syscon = LM3S69XX_SYSCON;
syscon->gpiohbctl |= SYSCONGPIOHBCTL_PORTA | SYSCONGPIOHBCTL_PORTB
| SYSCONGPIOHBCTL_PORTC | SYSCONGPIOHBCTL_PORTD
| SYSCONGPIOHBCTL_PORTE | SYSCONGPIOHBCTL_PORTF
| SYSCONGPIOHBCTL_PORTG
#if LM3S69XX_NUM_GPIO_BLOCKS > 7
| SYSCONGPIOHBCTL_PORTH
#endif
;
#endif /* LM3S69XX_USE_AHB_FOR_GPIO */
lm3s69xx_gpio_set_config_array(start_config_gpio,
sizeof(start_config_gpio) / sizeof(start_config_gpio[0]));
}
void bsp_start(void)
{
init_main_osc();
init_gpio();
bsp_interrupt_initialize();
}
|
