diff options
author | Leo C | 2014-08-24 14:16:18 +0200 |
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committer | Leo C | 2014-08-24 14:16:18 +0200 |
commit | 35e9ec0c03a150e3fe6a3350549573e4c02be67b (patch) | |
tree | 2978e415de4009b99a44ecf8fe8d19152f9ebfaf /avr/main.c | |
parent | 61b0cfe9df810db4fbca78e5f880d61c5063f324 (diff) | |
download | z180-stamp-35e9ec0c03a150e3fe6a3350549573e4c02be67b.zip |
getenv_ulong(), TWI int opt
Diffstat (limited to 'avr/main.c')
-rw-r--r-- | avr/main.c | 85 |
1 files changed, 49 insertions, 36 deletions
@@ -19,26 +19,53 @@ #include "cli.h" #include "env.h" +#define udelay(n) _delay_us(n) + +static uint8_t mcusr; + /*--------------------------------------------------------------------------*/ #if DEBUG -void preset_ram (void) __attribute__ ((naked)) \ - __attribute__ ((section (".init3"))); -void -preset_ram (void) + +__attribute__ ((naked)) __attribute__ ((section (".init3"))) +void preset_ram (void) { for (uint8_t *p = RAMSTART; p <= (uint8_t *) RAMEND; p++) *p = 0xdd; } -#endif -/*--------------------------------------------------------------------------*/ -static uint8_t mcusr; +static const FLASH char * const FLASH rreasons[] = { + FSTR("Power on"), + FSTR("External"), + FSTR("Brown out"), + FSTR("Watchdog"), + FSTR("JTAG"), + }; + +static +void print_reset_reason(void) +{ + uint8_t r = mcusr & 0x1f; + const FLASH char * const FLASH *p = rreasons; + + printf_P(PSTR("### Reset reason(s): %s"), r ? "" : "none"); + for ( ; r; p++, r >>= 1) { + if (r & 1) { + my_puts_P(*p); + if (r & ~1) + printf_P(PSTR(", ")); + } + } + printf_P(PSTR(".\n")); +} + +#endif static void setup_avr(void) { /* save and clear reset reason(s) */ + /* TODO: move to init section? */ mcusr = MCUSR; MCUSR = 0; @@ -70,36 +97,13 @@ void setup_avr(void) TIMSK1 = _BV(OCIE1A); // Enable TC1.oca interrupt } -static const FLASH char * const FLASH rreasons[] = { - FSTR("Power on"), - FSTR("External"), - FSTR("Brown out"), - FSTR("Watchdog"), - FSTR("JTAG"), - }; - static -void print_reset_reason(void) +int reset_reason_is_power_on(void) { - uint8_t r = mcusr & 0x1f; - const FLASH char * const FLASH *p = rreasons; - - printf_P(PSTR("Reset reason(s): %s"), r ? "" : "none"); - for ( ; r; p++, r >>= 1) { - if (r & 1) { - my_puts_P(*p); - if (r & ~1) - printf_P(PSTR(", ")); - } - } - printf_P(PSTR(".\n")); + return (mcusr & _BV(PORF)) != 0; } - -/*******************************************************************************/ - -#define udelay(n) _delay_us(n) - +/*--------------------------------------------------------------------------*/ /* Stored value of bootdelay, used by autoboot_command() */ static int stored_bootdelay; @@ -160,8 +164,7 @@ const char *bootdelay_process(void) char *s; int bootdelay; - s = getenv("bootdelay"); - bootdelay = s ? atoi(s) : CONFIG_BOOTDELAY; + bootdelay = (int) getenv_ulong("bootdelay", 10, CONFIG_BOOTDELAY); debug("### main_loop entered: bootdelay=%d\n\n", bootdelay); @@ -199,6 +202,9 @@ int main(void) setup_avr(); z80_setup_bus(); + + if (reset_reason_is_power_on()) + _delay_ms(CONFIG_POWRON_DELAY); serial_setup(); sei(); @@ -209,7 +215,14 @@ int main(void) #endif env_init(); - i2c_init(34920); + +#if DEBUG + unsigned long i_speed = getenv_ulong("i2c_clock", 10, CONFIG_SYS_I2C_CLOCK); + debug("### Setting I2C clock Frequency to %lu Hz.\n", i_speed); + i2c_init(i_speed); +#else + i2c_init(CONFIG_SYS_I2C_CLOCK); +#endif printf_P(PSTR("\n(ATMEGA1281+HD64180)_stamp Tester\n")); |