diff options
Diffstat (limited to 'sim')
| -rw-r--r-- | sim/m68hc11/ChangeLog | 8 | ||||
| -rw-r--r-- | sim/m68hc11/dv-m68hc11spi.c | 38 |
2 files changed, 38 insertions, 8 deletions
diff --git a/sim/m68hc11/ChangeLog b/sim/m68hc11/ChangeLog index 8f4bd5f..8b5a69c 100644 --- a/sim/m68hc11/ChangeLog +++ b/sim/m68hc11/ChangeLog @@ -1,3 +1,11 @@ +2000-09-06 Stephane Carrez <Stephane.Carrez@worldnet.fr> + + * dv-m68hc11spi.c (m68hc11spi_io_read_buffer): Clear the interrupts. + (m68hc11spi_io_write_buffer): Likewise and fix the spi frame. + (m68hc11spi_info): Clarify the status report + of the SPI when a byte is being sent. + (m68hc11spi_clock): Fix the spi send frame. + 2000-08-11 Stephane Carrez <Stephane.Carrez@worldnet.fr> * sim-main.h (m68hc11_map_level): Define level of address mappings. diff --git a/sim/m68hc11/dv-m68hc11spi.c b/sim/m68hc11/dv-m68hc11spi.c index 96e73d2..04ac825 100644 --- a/sim/m68hc11/dv-m68hc11spi.c +++ b/sim/m68hc11/dv-m68hc11spi.c @@ -229,8 +229,9 @@ set_bit_port (struct hw *me, sim_cpu *cpu, int port, int mask, int value) */ -#define SPI_START_BIT 0 -#define SPI_MIDDLE_BIT 1 +#define SPI_START_BYTE 0 +#define SPI_START_BIT 1 +#define SPI_MIDDLE_BIT 2 void m68hc11spi_clock (struct hw *me, void *data) @@ -260,15 +261,27 @@ m68hc11spi_clock (struct hw *me, void *data) controller->tx_bit--; controller->mode = SPI_MIDDLE_BIT; } - else + else if (controller->mode == SPI_MIDDLE_BIT) { controller->mode = SPI_START_BIT; } - /* Change the SPI clock at each event on bit 4 of port D. */ - controller->clk_pin = ~controller->clk_pin; - set_bit_port (me, cpu, M6811_PORTD, (1 << 4), controller->clk_pin); + if (controller->mode == SPI_START_BYTE) + { + /* Start a new SPI transfer. */ + /* TBD: clear SS output. */ + controller->mode = SPI_START_BIT; + controller->tx_bit = 7; + set_bit_port (me, cpu, M6811_PORTD, (1 << 4), ~controller->clk_pin); + } + else + { + /* Change the SPI clock at each event on bit 4 of port D. */ + controller->clk_pin = ~controller->clk_pin; + set_bit_port (me, cpu, M6811_PORTD, (1 << 4), controller->clk_pin); + } + /* Transmit is now complete for this byte. */ if (controller->mode == SPI_START_BIT && controller->tx_bit < 0) { @@ -339,6 +352,8 @@ m68hc11spi_info (struct hw *me) { signed64 t; + sim_io_printf (sd, " SPI has %d bits to send\n", + controller->tx_bit + 1); t = hw_event_remain_time (me, controller->spi_event); sim_io_printf (sd, " SPI operation finished in %ld cycles\n", (long) t); @@ -389,6 +404,7 @@ m68hc11spi_io_read_buffer (struct hw *me, { cpu->ios[M6811_SPSR] &= ~controller->rx_clear_scsr; controller->rx_clear_scsr = 0; + interrupts_update_pending (&cpu->cpu_interrupts); } val = controller->rx_char; break; @@ -466,6 +482,13 @@ m68hc11spi_io_write_buffer (struct hw *me, return 0; } + if (controller->rx_clear_scsr) + { + cpu->ios[M6811_SPSR] &= ~controller->rx_clear_scsr; + controller->rx_clear_scsr = 0; + interrupts_update_pending (&cpu->cpu_interrupts); + } + /* If transfer is taking place, a write to SPDR generates a collision. */ if (controller->spi_event) @@ -479,8 +502,7 @@ m68hc11spi_io_write_buffer (struct hw *me, /* Prepare to send a byte. */ controller->tx_char = val; - controller->tx_bit = 7; - controller->mode = 0; + controller->mode = SPI_START_BYTE; /* Toggle clock pin internal value when CPHA is 0 so that it will really change in the middle of a bit. */ |